fix: keep a v2 session idle when the model changes between turns (#1586 )

On ACP v2, changing the model of an idle session left the session reporting `running` with no work in progress, and it never reported `idle` again until some later turn ended. A client that refuses prompts while the session is `running` could then never send the prompt that would end it. ## Cause After `setModel`, Claude Code echoes a user message that carries only the local command's output: ```json { "type": "user", "message": { "role": "user", "content": "<local-command-stdout>Set model to `haiku (claude-haiku-5-5)`</local-command-stdout>" }, "parent_tool_use_id": null, "uuid": "…", "isReplay": true } ``` The v2 session read every top-level echo as a prompt that Claude Code took in, and opened a turn for it. A model change runs no turn: no `command_lifecycle` frame, `result` or `session_state_changed` follows the echo, so nothing closed that turn. Captured against the bundled CLI (adapter 0.104.1): `state_update running` went out 18 ms after `session/set_config_option`, and no `idle` followed in the next 75 seconds. ## Fix An echo whose content is only local command output, and whose uuid is not one of the session's pending prompts, no longer opens a turn. The check is `isLocalCommandOutput` in `message-filters.ts`, next to the helpers that already recognize these markers. The pending-prompt exception keeps a client's own prompt working with a CLI that sends no `command_lifecycle` frames, where the echo is the only sign that the prompt was inserted. ## Scope - v2 only. The v1 core takes its state from `session_state_changed` and does not open turns at echoes. - I captured a model change. Other local commands that Claude Code runs outside a turn and echoes the same way are covered by the same check, but I did not capture them. ## Testing - New case in `src/tests/v2/v2.test.ts` sends the echo as the CLI sent it. Without the fix it fails with `expected [ 'running' ] to deeply equal []`. - Reran the capture against the bundled CLI with the fix: no `running` after either model change, and the next prompt ran `running` then `idle`. - `npm run check` and `npm run test:run` pass.
feat: serve session/set_title on ACP v1 and v2 (#1585 )
2026-11-10 19:32:21 +00:00 · 2026-11-10 18:49:50 +00:00 · 2026-11-10 18:28:46 +00:00 · 2026-11-10 18:11:39 +00:00 · 2026-11-10 18:51:11 +01:00 · 2026-11-10 17:54:17 +01:00
87 changed files with 1491 additions and 468 deletions
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.104.0"
+  ".": "0.104.1"
 }
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Changelog

+## [0.104.1](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.104.0...v0.104.1) (2026-11-10)
+
+
+### Bug Fixes
+
+* carry the auth detail in the ACP account label ([#1573](https://github.com/agentclientprotocol/claude-agent-acp/issues/1573)) ([3d6eb7b](https://github.com/agentclientprotocol/claude-agent-acp/commit/3d6eb7b5b650a1f9e5d2e869e92e313c32dbdc86))
+* distinguish Ultra from Max in auth status ([#1574](https://github.com/agentclientprotocol/claude-agent-acp/issues/1574)) ([7d95d30](https://github.com/agentclientprotocol/claude-agent-acp/commit/7d95d30ec3a4813d580b3bfdedb08f03d93a3571))
+* update to @anthropic-ai/claude-agent-sdk 0.3.322 ([#1577](https://github.com/agentclientprotocol/claude-agent-acp/issues/1577)) ([b89e449](https://github.com/agentclientprotocol/claude-agent-acp/commit/b89e4497da9184072e7f3c4bb28de79801659222))
+
 ## [0.104.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.103.0...v0.104.0) (2026-11-10)


--- a/README.md
+++ b/README.md
@@ -140,7 +140,7 @@ for v2 is negotiated down to v1. With `v2`, the adapter rejects the `initialize`

 On v2 the adapter serves the session baseline (`session/new`, `session/list`, `session/resume`
 with replay, `session/close`, `session/prompt`, `session/cancel`), `session/delete`,
-`session/fork`, additional directories, config options (the mode is one), plans, notices,
+`session/fork`, `session/status`, `session/set_title`, additional directories, config options (the mode is one), plans, notices,
 compaction, display terminals for commands, permission requests, elicitation, providers, auth, and
 [subagents](#subagent-sessions). Steering is v1 only for now.

--- a/docs/air-extensions.md
+++ b/docs/air-extensions.md
@@ -228,7 +228,7 @@ The adapter keeps them where they are.

 ## Auth source display

-The connection-scoped `_auth/status_update` continues to report agent-owned authentication, not client-owned `providers/set` routing. The adapter also reports the same identity through the ACP `auth/status` method and `auth/status_update` notification (advertised as `auth.status`), with `kind`, `detail` and `plan` under the account's `_meta.claudeCode`. Each notification is sent when its own payload changed. `auth/status` answers with the identity last reported and starts a new read, whose change arrives as a notification. When the active key source is `apiKeyHelper`, the adapter reads the effective helper command through SDK `resolveSettings` / the session's `SettingsManager`, including programmatic settings overrides.
+The connection-scoped `_auth/status_update` continues to report agent-owned authentication, not client-owned `providers/set` routing. The adapter also reports the same identity through the ACP `auth/status` method and `auth/status_update` notification (advertised as `auth.status`), with `kind`, `detail` and `plan` under the account's `_meta.claudeCode`. The account's `label` also carries a `detail` in parentheses, e.g. `Anthropic API key (ANTHROPIC_API_KEY)`. Each notification is sent when its own payload changed. `auth/status` answers with the identity last reported and starts a new read, whose change arrives as a notification. When the active key source is `apiKeyHelper`, the adapter reads the effective helper command through SDK `resolveSettings` / the session's `SettingsManager`, including programmatic settings overrides.

 A command containing the whole word `central` and the word sequence `proxy start` is displayed as:

@@ -240,6 +240,8 @@ Matching is case-insensitive and accepts multiple whitespace characters between

 Other active helpers use `label: "Anthropic API key"` and `detail: "API key helper"`; unknown key-source identifiers are not exposed as display text. CLI and SDK reads share this presentation, retain stale-probe protection, and suppress unchanged notifications.

+For Max subscriptions, the existing `claude auth status --json` probe's optional `planTier` distinguishes `max_20x` (displayed as `Claude Ultra`) from `max_5x` (`Claude Max`). Missing, unrecognized, or malformed tiers fall back to the subscription's usual label. Other subscriptions and auth sources keep their existing classification. The raw `account.plan` and ACP `_meta.claudeCode.plan` remain unchanged. SDK account reads lack the tier, so they preserve the known label for the same account and plan; a fresh CLI read replaces it, including when the tier is absent. This is display metadata, not an entitlement check, and requires no additional probe or direct credential-file reads.
+
 ## Zed conventions

 The adapter keeps these Zed and upstream conventions unchanged for every client.
@@ -1406,6 +1408,8 @@ Each row carries `_meta.jetbrains.air` with flat row fields of the RFDs. `archiv

 `_session/rename { "sessionId": "…", "title": "…" }` returns `{}`.

+ACP's `session/set_title` renames the same way for every client, on v1 and v2, without `sessionIndex`, and returns `{ "title": "…" }`: the title as `session/list` shows it to the client. On v1 an AIR client gets it without the archive prefix, and every other client, and every v2 client, with it.
+
 - A blank title is `-32602`. The adapter collapses whitespace and keeps the first 200 characters, trimmed, as the CLI does. An `[archived] ` prefix of the requested title is dropped: a rename never changes the archive state.
 - The title is stored as the title records of [Archive](#archive): a `custom-title` and an `agent-name` record. An archived session keeps its `[archived] ` prefix (and the title is cut to 200 characters with it), so a rename does not unarchive it.
 - A session that runs here on a CLI without the `rename_session` control request is refused with `-32600`: its CLI holds the title and would write it back.
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,16 +1,16 @@
 {
  "name": "@agentclientprotocol/claude-agent-acp",
-  "version": "0.104.0",
+  "version": "0.104.1",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "@agentclientprotocol/claude-agent-acp",
-      "version": "0.104.0",
+      "version": "0.104.1",
      "license": "Apache-2.0",
      "dependencies": {
        "@agentclientprotocol/sdk": "2.5.0",
-        "@anthropic-ai/claude-agent-sdk": "0.3.321",
+        "@anthropic-ai/claude-agent-sdk": "0.3.322",
        "diff": "9.0.0",
        "zod": "4.6.7"
      },
@@ -53,22 +53,22 @@
      }
    },
    "node_modules/@anthropic-ai/claude-agent-sdk": {
-      "version": "0.3.321",
-      "resolved": "https://registry.npmjs.org/@anthropic-ai/claude-agent-sdk/-/claude-agent-sdk-0.3.321.tgz",
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+      "version": "0.3.322",
+      "resolved": "https://registry.npmjs.org/@anthropic-ai/claude-agent-sdk/-/claude-agent-sdk-0.3.322.tgz",
+      "integrity": "sha512-r88ij7R3SPV2j3BtFuavgrbWZNE8SVVS42AOQ1KxlS+QnSwNNnUhmVXV3Es2dniZySBYX8ENebL43ffhiB0azw==",
      "license": "SEE LICENSE IN README.md",
      "engines": {
        "node": ">=18.14.0"
      },
      "optionalDependencies": {
-        "@anthropic-ai/claude-agent-sdk-darwin-arm64": "0.3.321",
-        "@anthropic-ai/claude-agent-sdk-darwin-x64": "0.3.321",
-        "@anthropic-ai/claude-agent-sdk-linux-arm64": "0.3.321",
-        "@anthropic-ai/claude-agent-sdk-linux-arm64-musl": "0.3.321",
-        "@anthropic-ai/claude-agent-sdk-linux-x64": "0.3.321",
-        "@anthropic-ai/claude-agent-sdk-linux-x64-musl": "0.3.321",
-        "@anthropic-ai/claude-agent-sdk-win32-arm64": "0.3.321",
-        "@anthropic-ai/claude-agent-sdk-win32-x64": "0.3.321"
+        "@anthropic-ai/claude-agent-sdk-darwin-arm64": "0.3.322",
+        "@anthropic-ai/claude-agent-sdk-darwin-x64": "0.3.322",
+        "@anthropic-ai/claude-agent-sdk-linux-arm64": "0.3.322",
+        "@anthropic-ai/claude-agent-sdk-linux-arm64-musl": "0.3.322",
+        "@anthropic-ai/claude-agent-sdk-linux-x64": "0.3.322",
+        "@anthropic-ai/claude-agent-sdk-linux-x64-musl": "0.3.322",
+        "@anthropic-ai/claude-agent-sdk-win32-arm64": "0.3.322",
+        "@anthropic-ai/claude-agent-sdk-win32-x64": "0.3.322"
      },
      "peerDependencies": {
        "@anthropic-ai/sdk": ">=0.93.0",
@@ -77,9 +77,9 @@
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    },
    "node_modules/@anthropic-ai/claude-agent-sdk-darwin-arm64": {
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-      "resolved": "https://registry.npmjs.org/@anthropic-ai/claude-agent-sdk-darwin-arm64/-/claude-agent-sdk-darwin-arm64-0.3.321.tgz",
-      "integrity": "sha512-r718mW98hvRbmCa0TtSgImHkgyPUjPXSHOsORrehn2a8Z0FU1A2RkX9gCjY7EzZgL0RNbZXsBbkuab//kUjzJw==",
+      "version": "0.3.322",
+      "resolved": "https://registry.npmjs.org/@anthropic-ai/claude-agent-sdk-darwin-arm64/-/claude-agent-sdk-darwin-arm64-0.3.322.tgz",
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@@ -90,9 +90,9 @@
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+      "version": "0.3.322",
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@@ -103,9 +103,9 @@
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@@ -119,9 +119,9 @@
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@@ -135,9 +135,9 @@
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@@ -151,9 +151,9 @@
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@@ -167,9 +167,9 @@
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@@ -180,9 +180,9 @@
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@@ -555,9 +555,9 @@
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@@ -573,9 +573,9 @@
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@@ -591,9 +591,9 @@
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@@ -609,9 +609,9 @@
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@@ -627,9 +627,9 @@
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@@ -645,9 +645,9 @@
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-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.2.16.tgz",
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+      "version": "1.2.18",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.2.18.tgz",
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@@ -663,9 +663,9 @@
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-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.2.16.tgz",
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+      "version": "1.2.18",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.2.18.tgz",
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        "arm64"
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@@ -684,9 +684,9 @@
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-      "version": "1.2.16",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-musl/-/binding-linux-arm64-musl-1.2.16.tgz",
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+      "version": "1.2.18",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-musl/-/binding-linux-arm64-musl-1.2.18.tgz",
+      "integrity": "sha512-4oqWItLLYt7IceOnElCct8T2ek5p7PmD7LN04TRJRXGo5f3HtKTgGH6PhYRFK4C2ICkq/LMUU0BVPvvlAKhm8g==",
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@@ -705,9 +705,9 @@
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+      "version": "1.2.18",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-ppc64-gnu/-/binding-linux-ppc64-gnu-1.2.18.tgz",
+      "integrity": "sha512-+AkRly5SrCEgnPhGRfub7pucASYEC2fTsxZg7VCcnozpA2+Wn/gCYy1t7LuJS67/xyJu/7noYBJncDUkbwgw2A==",
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        "ppc64"
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@@ -726,9 +726,9 @@
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    "node_modules/@rolldown/binding-linux-s390x-gnu": {
-      "version": "1.2.16",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-s390x-gnu/-/binding-linux-s390x-gnu-1.2.16.tgz",
-      "integrity": "sha512-Vx7Xg5uUJuNcujJjI70OICaH0EYj80BtOLZTSN7uOYg8QOLlyKnaG0IW7Fn/J0IpJsaKzmDKMhOQv1JBM9m9vg==",
+      "version": "1.2.18",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-s390x-gnu/-/binding-linux-s390x-gnu-1.2.18.tgz",
+      "integrity": "sha512-Ttg1r9vVykMnQrE/GwYO9icKtXiuiMfRe/w74xJkeoVuvhRG+WtT6LEMOf58Yl63yd77lhHzO8Y55R8CC3XALA==",
      "cpu": [
        "s390x"
      ],
@@ -747,9 +747,9 @@
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    },
    "node_modules/@rolldown/binding-linux-x64-gnu": {
-      "version": "1.2.16",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-gnu/-/binding-linux-x64-gnu-1.2.16.tgz",
-      "integrity": "sha512-TNKhgE3uJTsTzatUSSYt0Kgo+Oa2uSlSjz4r1aEIea7HX6ULBym4fAlYUhG1i6pjNf2njfCUAfKwr6C3E9Xg1w==",
+      "version": "1.2.18",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-gnu/-/binding-linux-x64-gnu-1.2.18.tgz",
+      "integrity": "sha512-xX1Tt4o5jUMma0vJsXp5eRZA9nOuyigb2dKJMMzZRmzMxLYGE9PaKKSqHPzPvSQgM8ZOEacSTQwDQcwWfh0xmQ==",
      "cpu": [
        "x64"
      ],
@@ -768,9 +768,9 @@
      }
    },
    "node_modules/@rolldown/binding-linux-x64-musl": {
-      "version": "1.2.16",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-musl/-/binding-linux-x64-musl-1.2.16.tgz",
-      "integrity": "sha512-7chXdpjXZ8qG0+mIxECN3cT9kvhZ3/oZhMX6Pp876P7CDrIy8nJswva6Mq357JR7eYXfuskwZxMeV1SzoZdHrA==",
+      "version": "1.2.18",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-musl/-/binding-linux-x64-musl-1.2.18.tgz",
+      "integrity": "sha512-4VVlGI5K2kociZlW3lSN8VjG3TW5yQIlAcfCdBXMgGjJxZll15Fa4ocRHXHvIVVnwlibCw/NQajJrNDiqqpiiw==",
      "cpu": [
        "x64"
      ],
@@ -789,9 +789,9 @@
      }
    },
    "node_modules/@rolldown/binding-openharmony-arm64": {
-      "version": "1.2.16",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-openharmony-arm64/-/binding-openharmony-arm64-1.2.16.tgz",
-      "integrity": "sha512-Kwjt+7uNTJK5/MDkGWGVO2KQPnj8yAV75dMpfwyHZrJSXWHrniOB0aUEWlVYf3H1hOqFLIStLdM5QXq6bnKmOQ==",
+      "version": "1.2.18",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-openharmony-arm64/-/binding-openharmony-arm64-1.2.18.tgz",
+      "integrity": "sha512-PApTsgH1jLYuyy3tSCz9De82Gq5qXwi7vImVZhEzTgX1C4150Cp5M2ZfL3pLvbCvbEHL0oJeC6pd6podtv8Y5w==",
      "cpu": [
        "arm64"
      ],
@@ -807,9 +807,9 @@
      }
    },
    "node_modules/@rolldown/binding-win32-arm64-msvc": {
-      "version": "1.2.16",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-arm64-msvc/-/binding-win32-arm64-msvc-1.2.16.tgz",
-      "integrity": "sha512-/LH6WfjDRXXJz/p5xl4TmU+jpcnwcxbKEQBW/GZE0JHfN0lGIyTtsUEGaQ/q/GikkGJ2yLKe6pwm7AnEWO8pdw==",
+      "version": "1.2.18",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-arm64-msvc/-/binding-win32-arm64-msvc-1.2.18.tgz",
+      "integrity": "sha512-J2XjWjx/SP+4x0H4r6dz3Vzb5WVkg7re40Do9K7HJ3sK2/xcmZrWwakXlSwaMvOkvruLJCD4CL/3wqsIR/thgg==",
      "cpu": [
        "arm64"
      ],
@@ -825,9 +825,9 @@
      }
    },
    "node_modules/@rolldown/binding-win32-x64-msvc": {
-      "version": "1.2.16",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-x64-msvc/-/binding-win32-x64-msvc-1.2.16.tgz",
-      "integrity": "sha512-1lv1KvX0Z871zfk7vw+dnXMMnHNyDwMzWG8Kv3HxDXMOhzCX4SHc7HK319fInP0i+0p9D8brkfzL7pJOaGl+tw==",
+      "version": "1.2.18",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-x64-msvc/-/binding-win32-x64-msvc-1.2.18.tgz",
+      "integrity": "sha512-XwRJxRQvkuEtS0hIIt29QrqPJ+JzMJSNYHJw4ae/mc6uEarfRG1ceyg4HmmWiBdL/YCb6g7N5BLbSvmRJRYZHw==",
      "cpu": [
        "x64"
      ],
@@ -1945,9 +1945,9 @@
      }
    },
    "node_modules/express-rate-limit": {
-      "version": "8.7.3",
-      "resolved": "https://registry.npmjs.org/express-rate-limit/-/express-rate-limit-8.7.3.tgz",
-      "integrity": "sha512-zPLqDI2f0gV2WmGnacLf9XSSqn4VldRyP5LCzOwx0BKH40mO6+2PCFkoSsRO2jePx87/Kf6NUF6P2QOTKXHbQA==",
+      "version": "8.7.4",
+      "resolved": "https://registry.npmjs.org/express-rate-limit/-/express-rate-limit-8.7.4.tgz",
+      "integrity": "sha512-LKBXzX700wz3zAGNNmVnjRI5mEbYkLv7UbMI4+9Xa+JPcg2UZh6AgY/2CZh9RrJjFM5ttC/N1lD+KzyFoZITCw==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
@@ -2408,9 +2408,9 @@
      "license": "ISC"
    },
    "node_modules/jose": {
-      "version": "6.2.16",
-      "resolved": "https://registry.npmjs.org/jose/-/jose-6.2.16.tgz",
-      "integrity": "sha512-4LSJpbuBuPdGrONCdZUy0xnxtLf8eEz+EY0SMXdHQEBU7bgUHDVblU/JAjryv3wID9/LK7/YuwFwq+AQNfMscQ==",
+      "version": "6.2.17",
+      "resolved": "https://registry.npmjs.org/jose/-/jose-6.2.17.tgz",
+      "integrity": "sha512-wOuK9V1yujQFH5S0ZWmLcDZN7+IKh9bUCC2ZPCf2HDlol3WWHy+PPyNjEI75FXRLMp3vDKQcupP59xhVU95hcg==",
      "license": "MIT",
      "peer": true,
      "funding": {
@@ -3275,9 +3275,9 @@
      }
    },
    "node_modules/rolldown": {
-      "version": "1.2.16",
-      "resolved": "https://registry.npmjs.org/rolldown/-/rolldown-1.2.16.tgz",
-      "integrity": "sha512-bWvlMpFKiTfDKfnK7FC2MPgPeWCf/Kpwsq49ApdW+FQaBZb6O6dZ4MAPbPUjp7hYQrw/RobqCzn64BRrQecGHw==",
+      "version": "1.2.18",
+      "resolved": "https://registry.npmjs.org/rolldown/-/rolldown-1.2.18.tgz",
+      "integrity": "sha512-C1uuT3UR60SShuCaPQFAAZyefJCWZlAKB02BV3BuPE2Rs4fevRQltEKoFO2tV5W9/eJhU5RieV6vJj3euulfNQ==",
      "dev": true,
      "license": "MIT",
      "peer": true,
@@ -3292,21 +3292,21 @@
        "node": "^20.19.0 || >=22.12.0"
      },
      "optionalDependencies": {
-        "@rolldown/binding-android-arm-eabi": "1.2.16",
-        "@rolldown/binding-android-arm64": "1.2.16",
-        "@rolldown/binding-darwin-arm64": "1.2.16",
-        "@rolldown/binding-darwin-x64": "1.2.16",
-        "@rolldown/binding-freebsd-x64": "1.2.16",
-        "@rolldown/binding-linux-arm-gnueabihf": "1.2.16",
-        "@rolldown/binding-linux-arm64-gnu": "1.2.16",
-        "@rolldown/binding-linux-arm64-musl": "1.2.16",
-        "@rolldown/binding-linux-ppc64-gnu": "1.2.16",
-        "@rolldown/binding-linux-s390x-gnu": "1.2.16",
-        "@rolldown/binding-linux-x64-gnu": "1.2.16",
-        "@rolldown/binding-linux-x64-musl": "1.2.16",
-        "@rolldown/binding-openharmony-arm64": "1.2.16",
-        "@rolldown/binding-win32-arm64-msvc": "1.2.16",
-        "@rolldown/binding-win32-x64-msvc": "1.2.16"
+        "@rolldown/binding-android-arm-eabi": "1.2.18",
+        "@rolldown/binding-android-arm64": "1.2.18",
+        "@rolldown/binding-darwin-arm64": "1.2.18",
+        "@rolldown/binding-darwin-x64": "1.2.18",
+        "@rolldown/binding-freebsd-x64": "1.2.18",
+        "@rolldown/binding-linux-arm-gnueabihf": "1.2.18",
+        "@rolldown/binding-linux-arm64-gnu": "1.2.18",
+        "@rolldown/binding-linux-arm64-musl": "1.2.18",
+        "@rolldown/binding-linux-ppc64-gnu": "1.2.18",
+        "@rolldown/binding-linux-s390x-gnu": "1.2.18",
+        "@rolldown/binding-linux-x64-gnu": "1.2.18",
+        "@rolldown/binding-linux-x64-musl": "1.2.18",
+        "@rolldown/binding-openharmony-arm64": "1.2.18",
+        "@rolldown/binding-win32-arm64-msvc": "1.2.18",
+        "@rolldown/binding-win32-x64-msvc": "1.2.18"
      }
    },
    "node_modules/router": {
@@ -3699,9 +3699,9 @@
      }
    },
    "node_modules/vite": {
-      "version": "8.3.6",
-      "resolved": "https://registry.npmjs.org/vite/-/vite-8.3.6.tgz",
-      "integrity": "sha512-UI7dK29NnS54Fk+mmo7o+jI6U8Fp7hDl+X5Q1k45WH+d4dSlbLVUETGQ+hfkNgvLQGyoElPj837nZyv4MBc0VA==",
+      "version": "8.3.7",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-8.3.7.tgz",
+      "integrity": "sha512-oxh0dMxrayBr33ScJvvBJ2HBQ2jc1TBrXKR2NyL/MJ9WPuX19mN2DXWUmywKdyw5RFVQBo8hmtb2FMC0LHrnng==",
      "dev": true,
      "license": "MIT",
      "peer": true,
@@ -3709,7 +3709,7 @@
        "lightningcss": "^1.33.0",
        "picomatch": "^4.0.7",
        "postcss": "^8.5.32",
-        "rolldown": "~1.2.16",
+        "rolldown": "~1.2.18",
        "tinyglobby": "^0.2.17"
      },
      "bin": {
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
  "publishConfig": {
    "access": "public"
  },
-  "version": "0.104.0",
+  "version": "0.104.1",
  "description": "An ACP-compatible coding agent powered by the Claude Agent SDK (TypeScript)",
  "main": "dist/lib.js",
  "types": "dist/lib.d.ts",
@@ -69,7 +69,7 @@
  },
  "dependencies": {
    "@agentclientprotocol/sdk": "2.5.0",
-    "@anthropic-ai/claude-agent-sdk": "0.3.321",
+    "@anthropic-ai/claude-agent-sdk": "0.3.322",
    "diff": "9.0.0",
    "zod": "4.6.7"
  },
--- a/src/acp-client.ts
+++ b/src/acp-client.ts
@@ -16,7 +16,7 @@ import type { AcpPermissionRequest } from "./permissions/presentation.js";
 * Client-facing surface the agent calls back into. This is the subset of ACP
 * client methods the agent actually uses, expressed as a narrow interface so
 * tests can supply lightweight mocks. In the v1 agent it is backed by
- * `ClientConnection` (`v1/acp-agent.ts`) over the SDK's typed `AgentContext`.
+ * `ClientConnection` (`v1/client-connection.ts`) over the SDK's typed `AgentContext`.
 * The v2 session output passes one that only takes `sessionUpdate`
 * (`v2/stream.ts`).
 */
--- a/src/auth-status-reporter.ts
+++ b/src/auth-status-reporter.ts
@@ -188,8 +188,8 @@ export class AuthStatusReporter {
  /**
   * Report the identity behind a session's `AccountInfo`.
   *
-   * `AccountInfo` is richer than the CLI probe (it is what the live query
-   * actually authenticates with). The v1 core calls it before the
+   * `AccountInfo` describes what the live query authenticates with, but lacks
+   * the CLI's plan tier. The v1 core calls it before the
   * `--hide-claude-auth` guard may refuse the session or the turn: that flag
   * blocks the *use* of a subscription, it does not make the state secret, and
   * a refusal is when the client most needs to know the account it was
@@ -225,7 +225,7 @@ export class AuthStatusReporter {
    }
    const fromSession = fromAccountInfo(account, apiKeyHelper);
    if (fromSession) {
-      this.set(fromSession);
+      this.set(mergeAuthStatus(this.current, fromSession, "session"));
    } else if (!this.loggedUninformativeAccount) {
      this.loggedUninformativeAccount = true;
      this.options.logger.log(
@@ -337,7 +337,7 @@ export class AuthStatusReporter {
    // The CLI probe can be poorer than the session `AccountInfo` for the very
    // same login (no organization, say). Keep those extra fields rather than
    // regressing the payload; a different identity replaces it wholesale.
-    const merged = mergeAuthStatus(this.current, status);
+    const merged = mergeAuthStatus(this.current, status, "cli");
    this.set(merged);
    this.options.onProbe?.(status.kind);
    return merged;
--- a/src/auth-status.ts
+++ b/src/auth-status.ts
@@ -104,8 +104,10 @@ export type AcpAuthStatus = Pick<AuthStatusResponse, "state" | "accounts">;
 * - No identity read yet (`undefined`): `unknown`, no accounts.
 * - `kind: "none"`: `unauthenticated`, no accounts.
 * - Any other kind: `authenticated`, with the identity as the one account,
- *   marked `active`. `_meta.claudeCode` carries the `kind`, `detail` and
- *   `plan` that the account fields have no place for.
+ *   marked `active`. The account has no field for `detail`, so its label
+ *   carries it in parentheses, e.g. "Anthropic API key (ANTHROPIC_API_KEY)",
+ *   for clients that show only the standard fields. `_meta.claudeCode`
+ *   carries the `kind`, `detail` and `plan` on their own.
 *
 * `--hide-claude-auth` does not change the payload: it reports the login the
 * CLI holds, also when the subscription guard refuses to use it.
@@ -117,7 +119,8 @@ export function toAcpAuthStatus(status: AuthStatus | undefined): AcpAuthStatus {
  if (status.kind === "none") {
    return { state: "unauthenticated" };
  }
-  const account: AuthAccount = { label: status.label, active: true };
+  const label = status.detail ? `${status.label} (${status.detail})` : status.label;
+  const account: AuthAccount = { label, active: true };
  if (status.account?.email) account.email = status.account.email;
  if (status.account?.organization) account.organization = status.account.organization;
  account._meta = {
@@ -141,6 +144,8 @@ export type CliAuthStatus = {
  orgId?: string;
  orgName?: string;
  subscriptionType?: string;
+  /** CLI-only tier, e.g. "max_5x" or "max_20x"; not in SDK AccountInfo. */
+  planTier?: string;
 };

 const NOT_LOGGED_IN: AuthStatus = {
@@ -267,6 +272,7 @@ export function fromCliStatus(stdout: string, apiKeyHelper?: string): AuthStatus
  return mapAuthFields({
    apiProvider: status.apiProvider,
    subscriptionType: status.subscriptionType,
+    planTier: status.planTier,
    apiKeySource: status.apiKeySource,
    email: status.email,
    organization: status.orgName,
@@ -287,6 +293,7 @@ export function fromCliStatus(stdout: string, apiKeyHelper?: string): AuthStatus
 function mapAuthFields(fields: {
  apiProvider?: string;
  subscriptionType?: string;
+  planTier?: string;
  apiKeySource?: string;
  email?: string;
  organization?: string;
@@ -326,7 +333,7 @@ function mapAuthFields(fields: {
    if (organization) account.organization = organization;
    return {
      kind: "account",
-      label: planLabel(subscriptionType),
+      label: planLabel(subscriptionType, fields.planTier),
      // No detail: the client falls back to `account.email` for line 2.
      account,
    };
@@ -334,12 +341,14 @@ function mapAuthFields(fields: {
  return notLoggedInAuthStatus();
 }

-/** Names the plan with exactly one "Claude". A newer CLI already reports
- *  "Claude Max", an older one reports "max", and both must read "Claude Max".
- *  Each word is title-cased; a word that already carries capitals is kept. */
-function planLabel(plan: string): string {
+/** Names the plan with exactly one "Claude". Without a tier, "Claude Max"
+ *  from a newer CLI and "max" from an older one both read "Claude Max".
+ *  Each word is title-cased; a word that already carries capitals is kept.
+ *  The CLI's max_20x tier identifies Ultra; other tiers keep the plan label. */
+function planLabel(plan: string, planTier?: string): string {
  const titled = plan.replace(/\S+/g, (word) => word.charAt(0).toUpperCase() + word.slice(1));
-  return /^claude(\s|$)/i.test(plan) ? titled : `Claude ${titled}`;
+  const label = /^claude(\s|$)/i.test(plan) ? titled : `Claude ${titled}`;
+  return label.toLowerCase() === "claude max" && planTier === "max_20x" ? "Claude Ultra" : label;
 }

 /**
@@ -367,8 +376,14 @@ export function sameIdentity(a: AuthStatus, b: AuthStatus): boolean {
 * organization the CLI probe omits. So when the read describes the same
 * identity, its values win field by field but the fields it lacks are kept;
 * when it describes a different identity, it replaces the old one wholesale.
+ * Session reads lack the CLI's plan tier, so keep the label for the same plan.
+ * A CLI read always replaces the label, including when its tier is absent.
 */
-export function mergeAuthStatus(previous: AuthStatus | undefined, next: AuthStatus): AuthStatus {
+export function mergeAuthStatus(
+  previous: AuthStatus | undefined,
+  next: AuthStatus,
+  source: "cli" | "session",
+): AuthStatus {
  if (!previous || !sameIdentity(previous, next)) {
    return next;
  }
@@ -379,6 +394,14 @@ export function mergeAuthStatus(previous: AuthStatus | undefined, next: AuthStat
  if (previous.account || next.account) {
    merged.account = { ...previous.account, ...next.account };
  }
+  if (
+    source === "session" &&
+    previous.account?.plan &&
+    next.account?.plan &&
+    planLabel(previous.account.plan).toLowerCase() === planLabel(next.account.plan).toLowerCase()
+  ) {
+    merged.label = previous.label;
+  }
  if (merged.vendor === undefined && previous.vendor !== undefined) {
    merged.vendor = previous.vendor;
  }
--- a/src/message-filters.ts
+++ b/src/message-filters.ts
@@ -87,6 +87,22 @@ function hasMarkerTag(text: string, tag: string): boolean {
  return markerTagText(text, tag) !== undefined;
 }

+/**
+ * Whether the content of a user message is only the output of a local
+ * command, such as the `<local-command-stdout>Set model to …</local-command-stdout>`
+ * that Claude Code echoes when the model changes.
+ */
+export function isLocalCommandOutput(content: unknown): boolean {
+  if (typeof content !== "string") return false;
+  if (
+    !hasMarkerTag(content, "local-command-stdout") &&
+    !hasMarkerTag(content, "local-command-stderr")
+  ) {
+    return false;
+  }
+  return stripMarkerTags(content).trim() === "";
+}
+
 function commandInvocationFromMarkerOnlyText(text: string): string | null {
  if (hasMarkerTag(text, "local-command-stdout") || hasMarkerTag(text, "local-command-stderr")) {
    return null;
--- a/src/paths.ts
+++ b/src/paths.ts
@@ -5,3 +5,16 @@ import * as path from "node:path";
 export function claudeConfigDir(): string {
  return process.env.CLAUDE_CONFIG_DIR ?? path.join(os.homedir(), ".claude");
 }
+
+/** `<config>/projects`, normalized like the SDK does. */
+export function projectsRoot(): string {
+  return path.join(claudeConfigDir(), "projects").normalize("NFC");
+}
+
+const SESSION_ID_PATTERN = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
+
+/** Whether `value` is a Claude session id (a UUID). Only such ids name a
+ *  transcript, and only such ids are safe to use as a file name. */
+export function isSessionId(value: unknown): value is string {
+  return typeof value === "string" && SESSION_ID_PATTERN.test(value);
+}
--- a/src/v1/session-index/activity.ts
+++ b/src/v1/session-index/activity.ts
--- a/src/v1/session-index/archive-title.ts
+++ b/src/v1/session-index/archive-title.ts
--- a/src/v1/session-index/background-tasks.ts
+++ b/src/v1/session-index/background-tasks.ts
@@ -40,7 +40,7 @@

 import { createReadStream } from "node:fs";
 import { createInterface } from "node:readline";
-import { TASK_NOTIFICATION_TAG, taskNotificationsOf } from "../../task-notifications.js";
+import { TASK_NOTIFICATION_TAG, taskNotificationsOf } from "../task-notifications.js";

 export type BackgroundTasks = {
  /** The ids of the tasks that started and did not end, in start order. */
--- a/src/v1/session-index/dir-listing.ts
+++ b/src/v1/session-index/dir-listing.ts
--- a/src/v1/session-index/first-prompt.ts
+++ b/src/v1/session-index/first-prompt.ts
--- a/src/v1/session-index/list-subscriptions.ts
+++ b/src/v1/session-index/list-subscriptions.ts
@@ -49,7 +49,8 @@ import {
  type LiveSessionRegistry,
  type LiveSnapshot,
 } from "./live-registry.js";
-import { isExactProjectDir, isSessionId, projectDirMatches, projectsRoot } from "./project-dirs.js";
+import { isSessionId, projectsRoot } from "../paths.js";
+import { isExactProjectDir, projectDirMatches } from "./project-dirs.js";
 import { type IndexRow, type SessionIndex, type TranscriptCandidate } from "./session-index.js";
 import { changeSignature, sessionInfoOf } from "./session-info.js";

--- a/src/v1/session-index/live-registry.ts
+++ b/src/v1/session-index/live-registry.ts
@@ -23,7 +23,7 @@ import { execFile } from "node:child_process";
 import * as fs from "node:fs/promises";
 import * as os from "node:os";
 import * as path from "node:path";
-import { claudeConfigDir } from "../../paths.js";
+import { claudeConfigDir } from "../paths.js";
 import { errorCode } from "./project-dirs.js";

 const SNAPSHOT_TTL_MS = 5_000;
--- a/src/v1/session-index/project-dirs.ts
+++ b/src/v1/session-index/project-dirs.ts
@@ -14,24 +14,10 @@

 import * as fs from "node:fs/promises";
 import * as path from "node:path";
-import { claudeConfigDir } from "../../paths.js";

 /** The SDK cuts an encoded path at this length and appends a hash. */
 const MAX_SANITIZED_LENGTH = 200;

-const SESSION_ID_PATTERN = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
-
-/** Whether `value` is a Claude session id (a UUID). Only such ids name a
- *  transcript, and only such ids are safe to use as a file name. */
-export function isSessionId(value: unknown): value is string {
-  return typeof value === "string" && SESSION_ID_PATTERN.test(value);
-}
-
-/** `<config>/projects`, normalized like the SDK does. */
-export function projectsRoot(): string {
-  return path.join(claudeConfigDir(), "projects").normalize("NFC");
-}
-
 function sanitize(value: string): string {
  return value.replace(/[^a-zA-Z0-9]/g, "-");
 }
--- a/src/session-index/rename.ts
+++ b/src/session-index/rename.ts
@@ -0,0 +1,115 @@
+/**
+ * Client renames of a session: `session/set_title` (v1 and v2) and AIR's
+ * `_session/rename` (v1). Both cores call {@link renameSession}, which stores
+ * the title in every transcript of the session (see
+ * {@link SessionIndexService.retitle}) and, for a session loaded on the
+ * connection, makes it the client title that no generated title replaces.
+ */
+
+import { RequestError } from "@agentclientprotocol/sdk/unstable";
+import type { Query } from "@anthropic-ai/claude-agent-sdk";
+import type { SessionTitles, TitledSession } from "../session-titles.js";
+import { storedTitle } from "./archive-title.js";
+import {
+  renameTo,
+  type RenameSessionRequest,
+  type RetitleOptions,
+  type SessionIndexService,
+  type TitleChange,
+} from "./service.js";
+
+/** A session loaded on the connection, and its title state. */
+export interface RetitledSession {
+  readonly session: TitledSession;
+  readonly titles: Pick<
+    SessionTitles,
+    "setExplicitTitle" | "storedTitle" | "rememberStoredTitle" | "shownTitle"
+  >;
+}
+
+type RenamingQuery = Query & {
+  renameSession?: (title: string, sessionId?: string) => Promise<void>;
+};
+
+/**
+ * Names a session; no generated title replaces it. An archived session stays
+ * archived. `loaded` is the session loaded on this connection, if any;
+ * `clientTitle` turns a stored title into the one the client shows (an AIR
+ * client's drops the archive prefix). Returns that title, which the loaded
+ * session also publishes as a `session_info_update`.
+ *
+ * A session that is not loaded and has no transcript is unknown (`-32002`).
+ */
+export async function renameSession(
+  index: SessionIndexService,
+  request: RenameSessionRequest,
+  loaded: RetitledSession | undefined,
+  clientTitle: (stored: string) => string = (stored) => stored,
+): Promise<string> {
+  const { sessionId } = request;
+  // As the CLI keeps it, and never with the archive prefix: a rename does
+  // not change the archive state.
+  const title = storedTitle(request.title, false, sessionId);
+  // The title as stored: an archived one is cut with its prefix.
+  const shown = (stored: string | undefined) => clientTitle(stored ?? title);
+  const stored = await retitleSession(index, sessionId, renameTo(title), shown, loaded, {
+    mayBeUnwritten: true,
+    sidecar: "always",
+  });
+  return shown(stored);
+}
+
+/**
+ * Retitles a session (see {@link SessionIndexService.retitle}) and returns
+ * the title stored. A session that runs here is titled through its CLI
+ * (`rename_session`). A loaded session's title state takes the change as a
+ * client title, so no generated title replaces it; `publish` is the title it
+ * then publishes.
+ */
+export async function retitleSession(
+  index: SessionIndexService,
+  sessionId: string,
+  change: TitleChange,
+  publish: Parameters<SessionTitles["setExplicitTitle"]>[0],
+  loaded: RetitledSession | undefined,
+  options: Pick<RetitleOptions, "mayBeUnwritten" | "sidecar">,
+): Promise<string | undefined> {
+  let stored: string | undefined;
+  // Decided once a title generation in flight has ended: the query may
+  // have closed meanwhile.
+  const persist = async () => {
+    const session = loaded?.session;
+    const query = session?.query as RenamingQuery | undefined;
+    // A closed session's CLI is gone here: only a running query titles it.
+    const running = session !== undefined && !session.queryClosed;
+    if (running && typeof query?.renameSession !== "function") {
+      // Its CLI holds the title and would write it back over ours.
+      throw RequestError.invalidRequest(
+        { sessionId },
+        "The Claude Code CLI of this session cannot change its title while it runs.",
+      );
+    }
+    const live = running
+      ? {
+          cwd: session.cwd,
+          rename: (title: string) => query!.renameSession!(title, sessionId),
+          stored: () => loaded!.titles.storedTitle,
+          remember: (title: string) => loaded!.titles.rememberStoredTitle(title),
+          shown: loaded!.titles.shownTitle,
+        }
+      : undefined;
+    stored = await index.retitle(sessionId, change, {
+      ...options,
+      // Without its CLI, a session needs its transcript.
+      mayBeUnwritten: live !== undefined && options.mayBeUnwritten,
+      live,
+    });
+    return stored;
+  };
+  if (loaded) {
+    await loaded.titles.setExplicitTitle(publish, persist);
+  } else {
+    await persist();
+  }
+  return stored;
+}
--- a/src/v1/session-index/service.ts
+++ b/src/v1/session-index/service.ts
@@ -18,8 +18,8 @@ import {
  type SessionInfo,
 } from "@agentclientprotocol/sdk/unstable";
 import { deleteSession as sdkDeleteSession } from "@anthropic-ai/claude-agent-sdk";
-import { airExtensionMeta } from "../../air-extension.js";
-import { sanitizeTitle } from "../../session-titles.js";
+import { airExtensionMeta } from "../air-extension.js";
+import { sanitizeTitle } from "../session-titles.js";
 import type { OwnSessionState } from "./activity.js";
 import {
  effectiveTitle,
@@ -36,11 +36,11 @@ import {
  type ListSubscriptionDeps,
 } from "./list-subscriptions.js";
 import { LiveSessionRegistry } from "./live-registry.js";
+import { isSessionId } from "../paths.js";
 import {
  canonicalPath,
  exists,
  isExactProjectDir,
-  isSessionId,
  projectDirMatches,
  sameProjectPath,
 } from "./project-dirs.js";
@@ -466,6 +466,18 @@ export type SessionIndexDeps = {
  logError: (message: string, error: unknown) => void;
 };

+/** The transcript reads and writes of the session index, without its list
+ *  or watcher: what a client without `sessionIndex` uses for
+ *  `session/set_title`, AIR's archive on delete, and delete's ordering
+ *  after them (see {@link SessionIndexService.exclusive}). */
+export function transcriptWriter(logger: {
+  error: (message: string, error: unknown) => void;
+}): SessionIndexService {
+  return new SessionIndexService({
+    logError: (message, error) => logger.error(`[session-index] ${message}:`, error),
+  });
+}
+
 export class SessionIndexService {
  readonly index: SessionIndex;
  readonly registry: LiveSessionRegistry;
@@ -541,8 +553,10 @@ export class SessionIndexService {
    };
  }

-  /** Runs `mutation` after the previous mutation of the session ended. */
-  private exclusive<T>(sessionId: string, mutation: () => Promise<T>): Promise<T> {
+  /** Runs `mutation` after the previous mutation of the session ended, such
+   *  as a delete that does not go through {@link delete}, so that a retitle
+   *  cannot append to a transcript the delete is removing. */
+  exclusive<T>(sessionId: string, mutation: () => Promise<T>): Promise<T> {
    const previous = this.mutations.get(sessionId) ?? Promise.resolve();
    const next = previous.catch(() => undefined).then(mutation);
    const settled = next.catch(() => undefined);
--- a/src/v1/session-index/session-index.ts
+++ b/src/v1/session-index/session-index.ts
@@ -21,20 +21,19 @@

 import * as fs from "node:fs/promises";
 import * as path from "node:path";
-import { sanitizeTitle } from "../../session-titles.js";
+import { sanitizeTitle } from "../session-titles.js";
 import { effectiveTitle, visibleTitle } from "./archive-title.js";
+import { isSessionId, projectsRoot } from "../paths.js";
 import {
  canonicalPath,
  encodeProjectPath,
  errorCode,
  exists,
  isExactProjectDir,
-  isSessionId,
  normalizePath,
  pathAndAncestors,
  projectDirMatches,
  projectDirsOf,
-  projectsRoot,
  sameProjectPath,
 } from "./project-dirs.js";
 import {
--- a/src/v1/session-index/session-info.ts
+++ b/src/v1/session-index/session-info.ts
@@ -5,7 +5,7 @@
 */

 import type { SessionInfo } from "@agentclientprotocol/sdk/unstable";
-import { withAirMeta } from "../../air-extension.js";
+import { withAirMeta } from "../air-extension.js";
 import { deriveActivity, selectCost, type OwnSessionState } from "./activity.js";
 import type { LiveRecord } from "./live-registry.js";
 import type { IndexRow } from "./session-index.js";
--- a/src/v1/session-index/transcript-scan.ts
+++ b/src/v1/session-index/transcript-scan.ts
--- a/src/v1/session-index/worktrees.ts
+++ b/src/v1/session-index/worktrees.ts
--- a/src/session-status.ts
+++ b/src/session-status.ts
@@ -0,0 +1,68 @@
+/**
+ * `session/status` (the unstable "Session status" RFD) of a session that the
+ * connection does not hold: `saved` or unknown. Each core answers `open`
+ * itself for the sessions it holds.
+ */
+import * as fs from "node:fs/promises";
+import * as path from "node:path";
+import { RequestError } from "@agentclientprotocol/sdk/unstable";
+import { isSessionId, projectsRoot } from "./paths.js";
+
+/** What a core advertises as `status` in its session capabilities. */
+export const SESSION_STATUS_CAPABILITY = {};
+
+/**
+ * `saved` when a project directory holds a transcript file of `sessionId`
+ * that is not empty. Its content is not read, so a transcript without a
+ * conversation is `saved` too, and its resume fails with `-32002`. Fails with
+ * `-32002` and `data.sessionId` otherwise:
+ *
+ * - an id that is not a UUID, such as a subagent's session id;
+ * - an id without a transcript: one never used, a session never prompted
+ *   (Claude Code writes the transcript at the first prompt), and a session
+ *   whose transcripts were removed.
+ *
+ * The request names no `cwd`, so a transcript of any project counts: a
+ * resume with another `cwd` can still fail with `-32002`.
+ *
+ * It lists the project directories and stats the one file name in each. No
+ * query starts and no session is loaded. A directory or file that cannot be
+ * read for another reason than being absent fails the request: it does not
+ * make the session unknown.
+ */
+export async function savedSessionStatus(sessionId: string): Promise<{ status: "saved" }> {
+  if (!isSessionId(sessionId) || !(await hasTranscript(sessionId))) {
+    throw RequestError.sessionNotFound(sessionId);
+  }
+  return { status: "saved" };
+}
+
+async function hasTranscript(sessionId: string): Promise<boolean> {
+  const root = projectsRoot();
+  let projects: string[];
+  try {
+    projects = await fs.readdir(root);
+  } catch (error) {
+    // No session was ever stored.
+    if (isAbsent(error)) return false;
+    throw error;
+  }
+  const found = await Promise.all(
+    projects.map((project) =>
+      fs.stat(path.join(root, project, `${sessionId}.jsonl`)).then(
+        (stats) => stats.isFile() && stats.size > 0,
+        (error: unknown) => {
+          // No such transcript, or `project` is a file.
+          if (isAbsent(error)) return false;
+          throw error;
+        },
+      ),
+    ),
+  );
+  return found.includes(true);
+}
+
+function isAbsent(error: unknown): boolean {
+  const code = (error as { code?: unknown }).code;
+  return code === "ENOENT" || code === "ENOTDIR";
+}
--- a/src/task-notifications.ts
+++ b/src/task-notifications.ts
@@ -1,7 +1,7 @@
 /**
 * The `<task-notification>` inputs that Claude Code writes to a transcript
 * when a background task stops. The replay of a session (`v1/acp-agent.ts`) and
- * the session index (`v1/session-index/background-tasks.ts`) read them here, so
+ * the session index (`session-index/background-tasks.ts`) read them here, so
 * both read the same fields.
 */

--- a/src/tests/acp-scenarios/snapshots/air/session-load-replay.jsonl
+++ b/src/tests/acp-scenarios/snapshots/air/session-load-replay.jsonl
@@ -1,4 +1,4 @@
-{"kind":"initialize","payload":{"_meta":{"jetbrains":{"air":{"capabilities":["sessionFailure","agentFileChangeReport","nativeSubagentSessions","asyncTasks","customInstructions","recommendedValue","diffPatch","planFile","backgroundSubagents"],"goal":{"actions":["set","clear"],"controlMethod":"_session/goal","version":1},"version":1}},"steering":{"supported":true}},"agentCapabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"logout":{},"status":{}},"loadSession":true,"mcpCapabilities":{"http":true,"sse":true},"promptCapabilities":{"embeddedContext":true,"image":true},"providers":{},"sessionCapabilities":{"additionalDirectories":{},"close":{},"delete":{},"fork":{},"list":{},"resume":{},"subagents":{},"systemPrompt":{"mode":{"override":{}}}}},"agentInfo":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"authMethods":[],"protocolVersion":1}}
+{"kind":"initialize","payload":{"_meta":{"jetbrains":{"air":{"capabilities":["sessionFailure","agentFileChangeReport","nativeSubagentSessions","asyncTasks","customInstructions","recommendedValue","diffPatch","planFile","backgroundSubagents"],"goal":{"actions":["set","clear"],"controlMethod":"_session/goal","version":1},"version":1}},"steering":{"supported":true}},"agentCapabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"logout":{},"status":{}},"loadSession":true,"mcpCapabilities":{"http":true,"sse":true},"promptCapabilities":{"embeddedContext":true,"image":true},"providers":{},"sessionCapabilities":{"additionalDirectories":{},"close":{},"delete":{},"fork":{},"list":{},"resume":{},"status":{},"subagents":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"agentInfo":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"authMethods":[],"protocolVersion":1}}
 {"kind":"sessionUpdate","payload":{"sessionId":"<session>","update":{"content":{"text":"Fix the bug","type":"text"},"messageId":"00000000-0000-4000-8000-00000000c001","sessionUpdate":"user_message_chunk"}}}
 {"kind":"sessionUpdate","payload":{"sessionId":"<session>","update":{"content":{"text":"Check the file.","type":"text"},"messageId":"msg_r1","sessionUpdate":"agent_thought_chunk"}}}
 {"kind":"sessionUpdate","payload":{"sessionId":"<session>","update":{"content":{"text":"I will edit it.","type":"text"},"messageId":"msg_r1","sessionUpdate":"agent_message_chunk"}}}
--- a/src/tests/acp-scenarios/snapshots/air/session-setup.jsonl
+++ b/src/tests/acp-scenarios/snapshots/air/session-setup.jsonl
@@ -1,3 +1,3 @@
-{"kind":"initialize","payload":{"_meta":{"jetbrains":{"air":{"capabilities":["sessionFailure","agentFileChangeReport","nativeSubagentSessions","asyncTasks","customInstructions","recommendedValue","diffPatch","planFile","backgroundSubagents"],"goal":{"actions":["set","clear"],"controlMethod":"_session/goal","version":1},"version":1}},"steering":{"supported":true}},"agentCapabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"logout":{},"status":{}},"loadSession":true,"mcpCapabilities":{"http":true,"sse":true},"promptCapabilities":{"embeddedContext":true,"image":true},"providers":{},"sessionCapabilities":{"additionalDirectories":{},"close":{},"delete":{},"fork":{},"list":{},"resume":{},"subagents":{},"systemPrompt":{"mode":{"override":{}}}}},"agentInfo":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"authMethods":[],"protocolVersion":1}}
+{"kind":"initialize","payload":{"_meta":{"jetbrains":{"air":{"capabilities":["sessionFailure","agentFileChangeReport","nativeSubagentSessions","asyncTasks","customInstructions","recommendedValue","diffPatch","planFile","backgroundSubagents"],"goal":{"actions":["set","clear"],"controlMethod":"_session/goal","version":1},"version":1}},"steering":{"supported":true}},"agentCapabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"logout":{},"status":{}},"loadSession":true,"mcpCapabilities":{"http":true,"sse":true},"promptCapabilities":{"embeddedContext":true,"image":true},"providers":{},"sessionCapabilities":{"additionalDirectories":{},"close":{},"delete":{},"fork":{},"list":{},"resume":{},"status":{},"subagents":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"agentInfo":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"authMethods":[],"protocolVersion":1}}
 {"kind":"newSession","payload":{"configOptions":[{"category":"mode","currentValue":"auto","description":"Session permission mode","id":"mode","name":"Mode","options":[{"_meta":{"jetbrains":{"air":{"kind":"standard","version":1}}},"description":"Always ask before making changes","name":"Manual","value":"default"},{"_meta":{"jetbrains":{"air":{"kind":"standard","version":1}}},"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"_meta":{"jetbrains":{"air":{"kind":"plan","version":1}}},"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"_meta":{"jetbrains":{"air":{"kind":"auto_review","version":1}}},"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"_meta":{"jetbrains":{"air":{"kind":"full_access","version":1}}},"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","id":"model","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"modes":{"availableModes":[{"_meta":{"jetbrains":{"air":{"kind":"standard","version":1}}},"description":"Always ask before making changes","id":"default","name":"Manual"},{"_meta":{"jetbrains":{"air":{"kind":"standard","version":1}}},"description":"Automatically accept all file edits","id":"acceptEdits","name":"Accept edits"},{"_meta":{"jetbrains":{"air":{"kind":"plan","version":1}}},"description":"Create a plan before making changes","id":"plan","name":"Plan"},{"_meta":{"jetbrains":{"air":{"kind":"auto_review","version":1}}},"description":"Claude handles permission decisions","id":"auto","name":"Auto"},{"_meta":{"jetbrains":{"air":{"kind":"full_access","version":1}}},"description":"Accepts all permissions","id":"bypassPermissions","name":"Bypass permissions"}],"currentModeId":"auto"},"sessionId":"<session>"}}
 {"kind":"sessionUpdate","payload":{"sessionId":"<session>","update":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]"},"name":"mcp"}],"sessionUpdate":"available_commands_update"}}}
--- a/src/tests/acp-scenarios/snapshots/v2/ask-user-question.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/ask-user-question.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/async-task-ends-before-tool-id.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/async-task-ends-before-tool-id.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/async-task-held-until-tool-id.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/async-task-held-until-tool-id.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/async-task-released-at-turn-end.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/async-task-released-at-turn-end.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/bash-background.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/bash-background.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/bash-error.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/bash-error.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/bash-foreground.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/bash-foreground.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/compaction-failed-legacy.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/compaction-failed-legacy.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/compaction-legacy.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/compaction-legacy.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/compaction-update.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/compaction-update.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/edit-rejected.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/edit-rejected.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/edit-with-permission.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/edit-with-permission.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/exit-plan-approve.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/exit-plan-approve.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/exit-plan-reject.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/exit-plan-reject.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/goal.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/goal.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"/goal Ship the feature","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/grep-and-glob.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/grep-and-glob.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/mcp-tool.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/mcp-tool.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/memory-recall.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/memory-recall.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/network-permission.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/network-permission.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/notebook-edit.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/notebook-edit.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/permission-denied.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/permission-denied.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/rate-limit-and-origin.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/rate-limit-and-origin.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/read.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/read.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/session-load-replay.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/session-load-replay.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[],"messageId":"00000000-0000-4000-8000-00000000c001","sessionUpdate":"user_message"}}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":{"text":"Fix the bug","type":"text"},"messageId":"00000000-0000-4000-8000-00000000c001","sessionUpdate":"user_message_chunk"}}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[],"messageId":"msg_r1","sessionUpdate":"agent_thought"}}}
--- a/src/tests/acp-scenarios/snapshots/v2/session-setup.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/session-setup.jsonl
@@ -1,2 +1,2 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/skill.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/skill.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/subagent-agent-async.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/subagent-agent-async.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/subagent-late-child-update.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/subagent-late-child-update.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/subagent-native-sessions.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/subagent-native-sessions.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/subagent-nested.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/subagent-nested.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/subagent-task-legacy.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/subagent-task-legacy.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/subagent-transcript-extension.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/subagent-transcript-extension.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/task-create-update.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/task-create-update.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/task-output-and-stop.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/task-output-and-stop.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/text-and-thinking.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/text-and-thinking.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/todo-write.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/todo-write.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/tool-progress.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/tool-progress.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/web-fetch-and-search.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/web-fetch-and-search.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/write-existing.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/write-existing.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/snapshots/v2/write-new.jsonl
+++ b/src/tests/acp-scenarios/snapshots/v2/write-new.jsonl
@@ -1,4 +1,4 @@
-{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
+{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}},"title":{}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
 {"kind":"response","method":"session/new","payload":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
 {"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
 {"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}
--- a/src/tests/acp-scenarios/compare.ts
+++ b/src/tests/acp-scenarios/compare.ts
@@ -28,6 +28,12 @@
 * - The `initialize` response also advertises `agentCapabilities.auth.status`,
 *   which origin/main did not: the agent now answers `auth/status` and sends
 *   `auth/status_update`.
+ * - The `initialize` response also advertises
+ *   `agentCapabilities.sessionCapabilities.status`, which origin/main did
+ *   not: the agent now serves `session/status`.
+ * - The `initialize` response also advertises
+ *   `agentCapabilities.sessionCapabilities.title`, which origin/main did not:
+ *   the agent now serves `session/set_title`.
 * - A SandboxNetworkAccess tool call is settled by a `tool_call_update` with
 *   only its final `status` once its permission request is answered. The
 *   callback runs nothing, so origin/main never settled the call (see
@@ -229,19 +235,17 @@ function isMeta(key: string): boolean {
  return key.startsWith("_meta.");
 }

-/** `record` without the session capability `key`, when it is an `initialize` response. */
-function withoutSessionCapability(record: Recorded, key: string): Recorded {
+/** `record` without the session capabilities `keys`, when it is an `initialize` response. */
+function withoutSessionCapabilities(record: Recorded, keys: readonly string[]): Recorded {
  if (record.kind !== "initialize") return record;
  const payload = record.payload as Json;
  const agent = payload.agentCapabilities as Json | undefined;
  const session = agent?.sessionCapabilities as Json | undefined;
-  if (!session || !(key in session)) return record;
+  if (!session || !keys.some((key) => key in session)) return record;
+  const remaining = keys.reduce((rest, key) => without(rest, key), session);
  return {
    ...record,
-    payload: {
-      ...payload,
-      agentCapabilities: { ...agent, sessionCapabilities: without(session, key) },
-    },
+    payload: { ...payload, agentCapabilities: { ...agent, sessionCapabilities: remaining } },
  } as Recorded;
 }

@@ -264,14 +268,18 @@ function withoutAuthStatusCapability(record: Recorded): Recorded {
 */
 export function compareWithBaseline(baseline: Recorded[], traffic: Recorded[]): string[] {
  const expected = baseline
-    .map((record) => withoutSessionCapability(withoutAirOnlyKeys(record) as Recorded, "subagents"))
+    .map((record) =>
+      withoutSessionCapabilities(withoutAirOnlyKeys(record) as Recorded, ["subagents"]),
+    )
    .filter((record) => {
      const update = updateOf(record);
      return !(update?.sessionUpdate === "session_info_update" && Object.keys(update).length === 1);
    });
  const current = withoutSandboxNetworkSettlements(
    traffic.map((record) =>
-      withoutAuthStatusCapability(withoutSessionCapability(record, "systemPrompt")),
+      withoutAuthStatusCapability(
+        withoutSessionCapabilities(record, ["systemPrompt", "status", "title"]),
+      ),
    ),
  );
  const violations: string[] = [];
--- a/src/tests/v1/session-index-units.test.ts
+++ b/src/tests/v1/session-index-units.test.ts
@@ -2,28 +2,28 @@ import { describe, expect, it } from "vitest";
 import * as fs from "node:fs/promises";
 import * as os from "node:os";
 import * as path from "node:path";
-import { deriveActivity, selectCost, type ActivityState } from "../../v1/session-index/activity.js";
-import { LiveSessionRegistry, type LiveRecord } from "../../v1/session-index/live-registry.js";
+import { deriveActivity, selectCost, type ActivityState } from "../session-index/activity.js";
+import { LiveSessionRegistry, type LiveRecord } from "../session-index/live-registry.js";
+import { isSessionId } from "../paths.js";
 import {
  encodeProjectPath,
-  isSessionId,
  pathAndAncestors,
  projectDirMatches,
-} from "../../v1/session-index/project-dirs.js";
+} from "../session-index/project-dirs.js";
 import {
  decodeListCursor,
  encodeListCursor,
  parseListOptions,
  parseRenameSessionRequest,
  type ListScope,
-} from "../../v1/session-index/service.js";
+} from "../session-index/service.js";
 import {
  effectiveTitle,
  isArchivedTitle,
  storedTitle,
  titleRecords,
  visibleTitle,
-} from "../../v1/session-index/archive-title.js";
+} from "../session-index/archive-title.js";
 import {
  agentWorktreeOf,
  continuedInSessionId,
@@ -33,11 +33,11 @@ import {
  sdkTitles,
  transcriptAgentName,
  type TranscriptFacts,
-} from "../../v1/session-index/transcript-scan.js";
-import { firstPrompt } from "../../v1/session-index/first-prompt.js";
-import { DirListings, statFiles } from "../../v1/session-index/dir-listing.js";
-import { SessionIndex, type IndexRow } from "../../v1/session-index/session-index.js";
-import { changeSignature, sessionInfoOf } from "../../v1/session-index/session-info.js";
+} from "../session-index/transcript-scan.js";
+import { firstPrompt } from "../session-index/first-prompt.js";
+import { DirListings, statFiles } from "../session-index/dir-listing.js";
+import { SessionIndex, type IndexRow } from "../session-index/session-index.js";
+import { changeSignature, sessionInfoOf } from "../session-index/session-info.js";

 const SESSION = "11111111-1111-4111-8111-111111111111";
 const lines = (...entries: object[]) => entries.map((entry) => JSON.stringify(entry)).join("\n");
--- a/src/tests/v1/acp-agent.test.ts
+++ b/src/tests/v1/acp-agent.test.ts
@@ -77,7 +77,7 @@ import {
  type SDKControlGetUsageResponse,
 } from "@anthropic-ai/claude-agent-sdk";
 import { createHash, randomUUID } from "crypto";
-import { mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
+import { chmod, mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
 import {
@@ -14953,6 +14953,79 @@ describe("session/fork", () => {
  });
 });

+describe("session/status", () => {
+  it("answers open for the sessions it holds, and the others from their stored transcripts", async () => {
+    const configDir = await mkdtemp(path.join(os.tmpdir(), "session-status-"));
+    vi.stubEnv("CLAUDE_CONFIG_DIR", configDir);
+    try {
+      const agent = new ClaudeAcpAgent({ sessionUpdate: async () => {} } as unknown as AcpClient, {
+        log: () => {},
+        error: () => {},
+      });
+      const { agentCapabilities } = await agent.initialize({
+        protocolVersion: 1,
+        clientCapabilities: {},
+      });
+      expect(agentCapabilities?.sessionCapabilities?.status).toEqual({});
+      const status = (sessionId: string) => agent.sessionStatus({ sessionId });
+      const unknown = (sessionId: string) => ({ code: -32002, data: { sessionId } });
+
+      const sessionId = randomUUID();
+      agent.sessions[sessionId] = {} as ClaudeAcpAgent["sessions"][string];
+      await expect(status(sessionId)).resolves.toEqual({ status: "open" });
+      // A held session whose query ended stays open: a load returns it as it is.
+      agent.sessions[sessionId]!.queryClosed = true;
+      await expect(status(sessionId)).resolves.toEqual({ status: "open" });
+      // A subagent's session id, and a name that every object inherits.
+      await expect(status("agent-1")).rejects.toMatchObject(unknown("agent-1"));
+      await expect(status("constructor")).rejects.toMatchObject(unknown("constructor"));
+
+      // Closed, and never prompted: no projects directory exists yet.
+      delete agent.sessions[sessionId];
+      await expect(status(sessionId)).rejects.toMatchObject(unknown(sessionId));
+      // A transcript of any project counts, next to a project without one.
+      await mkdir(path.join(configDir, "projects", "-other"), { recursive: true });
+      const project = path.join(configDir, "projects", "-project");
+      // A directory of that name is no transcript.
+      await mkdir(path.join(project, `${sessionId}.jsonl`), { recursive: true });
+      await expect(status(sessionId)).rejects.toMatchObject(unknown(sessionId));
+      await rm(path.join(project, `${sessionId}.jsonl`), { recursive: true });
+      await writeFile(path.join(project, `${sessionId}.jsonl`), "{}\n");
+      await expect(status(sessionId)).resolves.toEqual({ status: "saved" });
+      // The request loaded nothing.
+      expect(agent.sessions[sessionId]).toBeUndefined();
+    } finally {
+      vi.unstubAllEnvs();
+      await rm(configDir, { recursive: true, force: true });
+    }
+  });
+
+  // Not on Windows, where `chmod` does not take the read permission away.
+  it.skipIf(process.platform === "win32" || process.getuid?.() === 0)(
+    "fails, not -32002, when a project directory cannot be read",
+    async () => {
+      const configDir = await mkdtemp(path.join(os.tmpdir(), "session-status-"));
+      vi.stubEnv("CLAUDE_CONFIG_DIR", configDir);
+      const project = path.join(configDir, "projects", "-project");
+      await mkdir(project, { recursive: true });
+      await chmod(project, 0o000);
+      try {
+        const agent = new ClaudeAcpAgent(
+          { sessionUpdate: async () => {} } as unknown as AcpClient,
+          { log: () => {}, error: () => {} },
+        );
+        await expect(agent.sessionStatus({ sessionId: randomUUID() })).rejects.toMatchObject({
+          code: "EACCES",
+        });
+      } finally {
+        await chmod(project, 0o700);
+        vi.unstubAllEnvs();
+        await rm(configDir, { recursive: true, force: true });
+      }
+    },
+  );
+});
+
 describe("session/close", () => {
  function createMockAgent() {
    const mockClient = {
--- a/src/tests/v1/auth-status.test.ts
+++ b/src/tests/v1/auth-status.test.ts
@@ -220,7 +220,7 @@ describe("auth status mappers", () => {
        state: "authenticated",
        accounts: [
          {
-            label: "Anthropic API key",
+            label: "Anthropic API key (env)",
            active: true,
            _meta: { claudeCode: { kind: "api_key", detail: "env" } },
          },
@@ -363,6 +363,48 @@ describe("auth status mappers", () => {
    ).toEqual({ kind: "account", label: "Claude subscription", detail: "OAuth token" });
  });

+  it.each([
+    ["max", "max_20x", "Claude Ultra"],
+    ["Claude Max", "max_20x", "Claude Ultra"],
+    ["max", "max_5x", "Claude Max"],
+    ["max", "max_other", "Claude Max"],
+    ["max", undefined, "Claude Max"],
+    ["max", "future_tier", "Claude Max"],
+    ["max", null, "Claude Max"],
+    ["max", 20, "Claude Max"],
+    ["max", { tier: "max_20x" }, "Claude Max"],
+    ["max", ["max_20x"], "Claude Max"],
+    ["pro", "max_20x", "Claude Pro"],
+    ["Future Plan", "future_tier", "Claude Future Plan"],
+  ])("labels CLI plan %j with tier %j as %j", (subscriptionType, planTier, label) => {
+    expect(
+      fromCliStatus(
+        JSON.stringify({
+          ...JSON.parse(CLI_SUBSCRIPTION),
+          subscriptionType,
+          planTier,
+        }),
+      ),
+    ).toEqual({
+      kind: "account",
+      label,
+      account: { plan: subscriptionType, email: "user@example.com", organization: "ACME" },
+    });
+  });
+
+  it.each([
+    [{ apiKeySource: "env" }, { kind: "api_key", label: "Anthropic API key", detail: "env" }],
+    [{ apiProvider: "bedrock" }, { kind: "external", label: "AWS Bedrock" }],
+    [{ apiProvider: "gateway" }, { kind: "gateway", label: "Custom model gateway" }],
+    [{ loggedIn: false }, { kind: "none", label: "Not logged in" }],
+  ])("does not let a subscription tier override auth fields %j", (fields, expected) => {
+    expect(
+      fromCliStatus(
+        JSON.stringify({ ...JSON.parse(CLI_SUBSCRIPTION), planTier: "max_20x", ...fields }),
+      ),
+    ).toEqual(expected);
+  });
+
  it("lets a third-party backend outrank the logged-out flag", () => {
    // `loggedIn` tracks the claude.ai login only; on Bedrock the credentials
    // are external and the agent is authenticated all the same.
@@ -384,19 +426,27 @@ describe("auth status mappers", () => {
    };
    // Same login, read from a source without the organization: it survives.
    expect(
-      mergeAuthStatus(stored, {
-        kind: "account",
-        label: "Claude Max",
-        account: { plan: "max", email: "user@example.com" },
-      }),
+      mergeAuthStatus(
+        stored,
+        {
+          kind: "account",
+          label: "Claude Max",
+          account: { plan: "max", email: "user@example.com" },
+        },
+        "cli",
+      ),
    ).toEqual(stored);
    // A different login replaces everything, organization included.
    expect(
-      mergeAuthStatus(stored, {
-        kind: "account",
-        label: "Claude Pro",
-        account: { plan: "pro", email: "other@example.com" },
-      }),
+      mergeAuthStatus(
+        stored,
+        {
+          kind: "account",
+          label: "Claude Pro",
+          account: { plan: "pro", email: "other@example.com" },
+        },
+        "cli",
+      ),
    ).toEqual({
      kind: "account",
      label: "Claude Pro",
@@ -404,7 +454,11 @@ describe("auth status mappers", () => {
    });
    // A different kind never merges, even when it looks adjacent.
    expect(
-      mergeAuthStatus(stored, { kind: "api_key", label: "Anthropic API key", detail: "env" }),
+      mergeAuthStatus(
+        stored,
+        { kind: "api_key", label: "Anthropic API key", detail: "env" },
+        "cli",
+      ),
    ).toEqual({ kind: "api_key", label: "Anthropic API key", detail: "env" });
    // Key sources identify api_key payloads.
    expect(
@@ -414,6 +468,29 @@ describe("auth status mappers", () => {
      ),
    ).toBe(false);
  });
+
+  it.each<["cli" | "session", string, string, string | undefined, string]>([
+    ["session", "max", "user@example.com", undefined, "Claude Ultra"],
+    ["session", "Claude Max", "user@example.com", undefined, "Claude Ultra"],
+    ["session", "pro", "user@example.com", undefined, "Claude Pro"],
+    ["session", "max", "other@example.com", undefined, "Claude Max"],
+    ["cli", "max", "user@example.com", "max_5x", "Claude Max"],
+    ["cli", "max", "user@example.com", undefined, "Claude Max"],
+    ["cli", "max", "user@example.com", "future_tier", "Claude Max"],
+  ])(
+    "merges a %s read of %s for %s with tier %s as %s",
+    (source, subscriptionType, email, planTier, label) => {
+      const previous = fromCliStatus(
+        JSON.stringify({ ...JSON.parse(CLI_SUBSCRIPTION), planTier: "max_20x" }),
+      );
+      const fields = { apiProvider: "firstParty" as const, subscriptionType, email };
+      const next =
+        source === "session"
+          ? fromAccountInfo(fields)
+          : fromCliStatus(JSON.stringify({ ...fields, loggedIn: true, planTier }));
+      expect(mergeAuthStatus(previous, next!, source).label).toBe(label);
+    },
+  );
 });

 describe("auth status over ACP", () => {
@@ -765,7 +842,7 @@ describe("auth status over ACP", () => {
      state: "authenticated",
      accounts: [
        {
-          label: "Custom model gateway",
+          label: "Custom model gateway (gw.example.com)",
          active: true,
          _meta: { claudeCode: { kind: "gateway", detail: "gw.example.com" } },
        },
@@ -783,7 +860,7 @@ describe("auth status over ACP", () => {
    agent.setAuthStatus({ kind: "api_key", label: "Anthropic API key", detail: "env" });
    expect(await agent.authStatusResponse()).toMatchObject({
      state: "authenticated",
-      accounts: [{ label: "Anthropic API key" }],
+      accounts: [{ label: "Anthropic API key (env)" }],
    });
  });

@@ -859,6 +936,32 @@ describe("auth status over ACP", () => {
    });
  });

+  it.each(["max_5x", undefined, "future_tier"])(
+    "keeps Ultra across session reads and refreshes the label for CLI tier %j",
+    async (planTier) => {
+      statusStdout = JSON.stringify({ ...JSON.parse(CLI_SUBSCRIPTION), planTier: "max_20x" });
+      await initialize();
+      const sessionId = await scriptedSession({
+        apiProvider: "firstParty",
+        subscriptionType: "Claude Max",
+        email: "user@example.com",
+      });
+      await promptOnce(sessionId);
+      expect(updates().every((call) => call[1].authStatus.label === "Claude Ultra")).toBe(true);
+      expect(await agent.authStatusResponse()).toMatchObject({
+        accounts: [{ label: "Claude Ultra", _meta: { claudeCode: { plan: "max" } } }],
+      });
+      await settle();
+
+      statusStdout = JSON.stringify({ ...JSON.parse(CLI_SUBSCRIPTION), planTier });
+      await promptOnce(sessionId);
+      expect(lastPush()?.label).toBe("Claude Max");
+      expect(authStatusUpdate.mock.calls.at(-1)?.[0]).toMatchObject({
+        accounts: [{ label: "Claude Max" }],
+      });
+    },
+  );
+
  it("lets a probe of a different identity replace the stored one wholesale", async () => {
    const sessionId = await scriptedSession({
      apiProvider: "firstParty",
--- a/src/tests/v1/background-tasks.test.ts
+++ b/src/tests/v1/background-tasks.test.ts
@@ -11,11 +11,11 @@ import * as fsSync from "node:fs";
 import * as os from "node:os";
 import * as path from "node:path";
 import type { SessionInfo } from "@agentclientprotocol/sdk/unstable";
-import type { ActivityState } from "../../v1/session-index/activity.js";
-import { endedTaskId, searchBackgroundTasks } from "../../v1/session-index/background-tasks.js";
-import { encodeProjectPath } from "../../v1/session-index/project-dirs.js";
-import { SessionIndex } from "../../v1/session-index/session-index.js";
-import { SessionIndexService } from "../../v1/session-index/service.js";
+import type { ActivityState } from "../../session-index/activity.js";
+import { endedTaskId, searchBackgroundTasks } from "../../session-index/background-tasks.js";
+import { encodeProjectPath } from "../../session-index/project-dirs.js";
+import { SessionIndex } from "../../session-index/session-index.js";
+import { SessionIndexService } from "../../session-index/service.js";

 let configDir: string;
 let workspace: string;
--- a/src/tests/v1/fork-session.test.ts
+++ b/src/tests/v1/fork-session.test.ts
@@ -6,7 +6,7 @@ import * as path from "node:path";
 import * as os from "node:os";
 import { messageIdForGrouping } from "../../sdk-to-acp.js";
 import { forkSession } from "../../fork-session.js";
-import { encodeProjectPath } from "../../v1/session-index/project-dirs.js";
+import { encodeProjectPath } from "../../session-index/project-dirs.js";

 // Use the real SDK against temporary transcripts, without starting Claude Code.
 let root: string;
--- a/src/tests/v1/session-index.test.ts
+++ b/src/tests/v1/session-index.test.ts
@@ -23,7 +23,7 @@ import {
  type InitializeResponse,
  type SessionInfo,
 } from "@agentclientprotocol/sdk/unstable";
-import { encodeProjectPath } from "../../v1/session-index/project-dirs.js";
+import { encodeProjectPath } from "../../session-index/project-dirs.js";
 import {
  archiveInsteadOfDelete,
  archiveTo,
@@ -31,16 +31,16 @@ import {
  parseBatchGetSessionsRequest,
  SessionIndexService,
  writeCustomTitleSidecar,
-} from "../../v1/session-index/service.js";
-import { scanTranscriptFile } from "../../v1/session-index/transcript-scan.js";
-import { repositoryWorktrees } from "../../v1/session-index/worktrees.js";
+} from "../../session-index/service.js";
+import { scanTranscriptFile } from "../../session-index/transcript-scan.js";
+import { repositoryWorktrees } from "../../session-index/worktrees.js";
 import {
  ListSubscriptions,
  MAX_SUBSCRIPTIONS,
  parseListSubscribeRequest,
  parseListUnsubscribeRequest,
  type ListChanges,
-} from "../../v1/session-index/list-subscriptions.js";
+} from "../../session-index/list-subscriptions.js";
 import { SessionTitles } from "../../session-titles.js";
 import { initializeClient } from "../helpers.js";
 import {
@@ -1350,6 +1350,48 @@ describe("_session/rename", () => {
  });
 });

+describe("session/set_title", () => {
+  it("titles a stored session for a client without the session index", async () => {
+    const session = await writeTranscript({});
+    const { agent } = createAgent();
+    await initializeClient(agent, {});
+    expect(
+      await agent.setSessionTitle({ sessionId: session.id, title: "  Investigate\n OAuth  " }),
+    ).toEqual({ title: "Investigate OAuth" });
+    expect(await lastRecords(session.file)).toEqual(titleRecords(session.id, "Investigate OAuth"));
+    const page = await agent.listSessions({ cwd: workspace });
+    expect(page.sessions[0]!.title).toBe("Investigate OAuth");
+  });
+
+  it.each([
+    ["an AIR client with sessionIndex", air("sessionIndex"), "Renamed"],
+    ["an AIR client without sessionIndex", air(), "Renamed"],
+    ["a client that is not AIR", {}, "[archived] Renamed"],
+  ])(
+    "keeps an archived session archived and answers the title %s shows",
+    async (_client, capabilities, shown) => {
+      const session = await writeTranscript({ trailer: titleRecords("", "[archived] Fix it") });
+      const { agent } = createAgent();
+      await initializeClient(agent, capabilities);
+      expect(await agent.setSessionTitle({ sessionId: session.id, title: "Renamed" })).toEqual({
+        title: shown,
+      });
+      expect(await lastRecords(session.file)).toEqual(
+        titleRecords(session.id, "[archived] Renamed"),
+      );
+    },
+  );
+
+  it.each([
+    ["an unknown session", () => ({ sessionId: randomUUID(), title: "x" }), -32002],
+    ["an empty title", () => ({ sessionId: randomUUID(), title: " \n " }), -32602],
+  ])("refuses %s", async (_case, params, code) => {
+    const { agent } = createAgent();
+    await initializeClient(agent, {});
+    await expect(agent.setSessionTitle(params())).rejects.toMatchObject({ code });
+  });
+});
+
 describe("_session/archive and _session/unarchive", () => {
  it("append AIR's archive title records, are idempotent and keep updatedAt", async () => {
    const session = await writeTranscript({ prompt: "Fix  the\nparser" });
@@ -1854,7 +1896,7 @@ describe("_session/list/subscribe", () => {
  });

  it("clears the failed turn of a session that runs here when a new turn starts", async () => {
-    const { noteSessionState } = await import("../../v1/session-index/connection.js");
+    const { noteSessionState } = await import("../../v1/session-index.js");
    const session = { lastTurnFailed: true } as any;
    noteSessionState(session, "idle", "running");
    expect(session.lastTurnFailed).toBe(false);
--- a/src/tests/v2/acp-v2.test.ts
+++ b/src/tests/v2/acp-v2.test.ts
@@ -5,7 +5,7 @@
 * schema, so a malformed v2 message fails the test.
 */
 import { randomUUID } from "node:crypto";
-import { appendFile, mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
+import { appendFile, mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
 import * as os from "node:os";
 import * as path from "node:path";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
@@ -35,6 +35,7 @@ import {
  v1SetSessionConfigOptionRequest,
  v2ConfigOptions,
 } from "../../v2/session-requests.js";
+import { encodeProjectPath } from "../../session-index/project-dirs.js";
 import { startupFailure } from "../helpers.js";
 import packageJson from "../../../package.json" with { type: "json" };

@@ -108,6 +109,8 @@ const sdk = vi.hoisted(() => ({
  accountInfo: async (): Promise<Record<string, unknown>> => ({}),
  /** The query switches its model (`setModel`). */
  setModel: async (_model?: string): Promise<void> => {},
+  /** Claude Code stores a session title (`rename_session`). */
+  renameSession: async (_title: string, _sessionId?: string): Promise<void> => {},
  /** Set to serve Remote Control, as a query of a CLI that supports it does. */
  enableRemoteControl: undefined as
    ((enabled: boolean, name?: string) => Promise<{ session_url?: string }>) | undefined,
@@ -142,6 +145,7 @@ vi.mock("@anthropic-ai/claude-agent-sdk", async () => {
        accountInfo: () => sdk.accountInfo(),
        setMcpServers: (servers: Record<string, unknown>) => sdk.setMcpServers(servers),
        setModel: (model?: string) => sdk.setModel(model),
+        renameSession: (title: string, sessionId?: string) => sdk.renameSession(title, sessionId),
        ...(sdk.enableRemoteControl ? { enableRemoteControl: sdk.enableRemoteControl } : {}),
      });
      return Object.assign(messages, controls);
@@ -394,6 +398,8 @@ describe("ACP protocol routing", () => {
      fork: {},
      additionalDirectories: {},
      systemPrompt: { mode: { override: {} } },
+      status: {},
+      title: {},
    });
    expect(response.capabilities?.providers).toEqual({});
    // Not `_session/steering`, which v1 advertises in the top-level `_meta`.
@@ -747,6 +753,236 @@ describe("ACP v2 sessions", () => {
    });
  });

+  describe("session/status", () => {
+    /** Stores a transcript of `sessionId`, as Claude Code does at the first prompt. */
+    async function storeTranscript(sessionId: string, content = "{}\n") {
+      const project = path.join(tempDir, "claude", "projects", "-project");
+      await mkdir(project, { recursive: true });
+      await writeFile(path.join(project, `${sessionId}.jsonl`), content);
+    }
+    const status = (agent: v2.ClientContext, sessionId: string) =>
+      agent.request(v2.methods.agent.session.status, { sessionId });
+    const unknown = (sessionId: string) => ({ code: -32002, data: { sessionId } });
+
+    it("answers from memory and the stored transcript, and starts or sends nothing", async () => {
+      const client = v2Client();
+      await client.app.connectWith(connectRouter(), async (agent) => {
+        await initializeV2(agent);
+        const neverUsed = randomUUID();
+        await expect(status(agent, neverUsed)).rejects.toMatchObject(unknown(neverUsed));
+        // Not a UUID: no file is looked up under such a name.
+        await expect(status(agent, "../settings")).rejects.toMatchObject(unknown("../settings"));
+
+        const { sessionId } = await agent.request(v2.methods.agent.session.new, { cwd });
+        await client.authUpdate(1);
+        // The agent's post-setup work runs on a timer.
+        await new Promise((resolve) => setTimeout(resolve, 20));
+        const sent = client.sessionUpdates.length;
+        // The state as a `state_update` snapshot holds it, with the session's list.
+        expect(await status(agent, sessionId)).toEqual({
+          status: "open",
+          state: { state: "idle", background: [] },
+        });
+
+        await agent.request(v2.methods.agent.session.close, { sessionId });
+        // Claude Code writes the transcript at the first prompt: none is stored.
+        await expect(status(agent, sessionId)).rejects.toMatchObject(unknown(sessionId));
+        // An empty transcript holds no conversation to resume.
+        await storeTranscript(sessionId, "");
+        await expect(status(agent, sessionId)).rejects.toMatchObject(unknown(sessionId));
+        await storeTranscript(sessionId);
+        expect(await status(agent, sessionId)).toEqual({ status: "saved" });
+
+        expect(sdk.queryOptions).toHaveLength(1);
+        expect(client.sessionUpdates).toHaveLength(sent);
+      });
+    });
+
+    it("answers a session whose query ended without session/close from its transcript", async () => {
+      // Claude Code exits right after it started.
+      sdk.run = async function* () {};
+      const client = v2Client();
+      await client.app.connectWith(connectRouter(), async (agent) => {
+        await initializeV2(agent);
+        const { sessionId } = await agent.request(v2.methods.agent.session.new, { cwd });
+        await vi.waitFor(() => expect(v2Session(sessionId)).toBeUndefined());
+
+        await expect(status(agent, sessionId)).rejects.toMatchObject(unknown(sessionId));
+        await storeTranscript(sessionId);
+        expect(await status(agent, sessionId)).toEqual({ status: "saved" });
+        await client.authUpdate(1);
+      });
+    });
+
+    it("answers saved while a resume still starts the session, without waiting for it", async () => {
+      const sessionId = randomUUID();
+      await storeTranscript(sessionId);
+      let started!: () => void;
+      const starting = new Promise<void>((resolve) => {
+        started = resolve;
+      });
+      const initialization = sdk.initializationResult;
+      sdk.initializationResult = async () => {
+        await starting;
+        return initialization();
+      };
+      const client = v2Client();
+      await client.app.connectWith(connectRouter(), async (agent) => {
+        await initializeV2(agent);
+        const resumed = agent.request(v2.methods.agent.session.resume, { sessionId, cwd });
+        await vi.waitFor(() => expect(sdk.queryOptions).toHaveLength(1));
+
+        expect(await status(agent, sessionId)).toEqual({ status: "saved" });
+
+        started();
+        await resumed;
+        expect(await status(agent, sessionId)).toMatchObject({ status: "open" });
+        await client.authUpdate(1);
+      });
+    });
+
+    it("reports a session that waits for a permission as requires_action", async () => {
+      let answer!: (response: v2.RequestPermissionResponse) => void;
+      scriptTurns(async function* (options) {
+        await options.canUseTool!("Bash", { command: "ls" }, {
+          signal: new AbortController().signal,
+          suggestions: [],
+          toolUseID: "toolu_ls",
+          requestId: randomUUID(),
+        } as Parameters<NonNullable<Options["canUseTool"]>>[2]);
+        yield result(options);
+        yield idleState(options);
+      });
+      const client = v2Client({
+        answerPermission: (() =>
+          new Promise<v2.RequestPermissionResponse>((resolve) => {
+            answer = resolve;
+          })) as unknown as () => v2.RequestPermissionResponse,
+      });
+      await client.app.connectWith(connectRouter(), async (agent) => {
+        await initializeV2(agent);
+        const { sessionId } = await agent.request(v2.methods.agent.session.new, { cwd });
+        await agent.request(v2.methods.agent.session.prompt, { sessionId, prompt: text("go") });
+        await vi.waitFor(() => expect(client.permissionRequests).toHaveLength(1));
+        await vi.waitFor(() =>
+          expect(turnTrace(client.sessionUpdates).at(-1)).toBe("requires_action"),
+        );
+
+        expect(await agent.request(v2.methods.agent.session.status, { sessionId })).toEqual({
+          status: "open",
+          state: { state: "requires_action", background: [] },
+        });
+
+        answer({ outcome: { outcome: "selected", optionId: "allow-once" } });
+        await vi.waitFor(() => expect(turnTrace(client.sessionUpdates).at(-1)).toMatch(/^idle/));
+        await client.authUpdate(1);
+      });
+      // The status request added no state to the turn's.
+      expect(turnTrace(client.sessionUpdates)).toEqual([
+        "user_message",
+        "running",
+        "requires_action",
+        "running",
+        "idle end_turn",
+      ]);
+    });
+  });
+
+  describe("session/set_title", () => {
+    it("titles an active session through Claude Code and publishes the stored title", async () => {
+      const renameSession = vi.fn(sdkDefaults.renameSession);
+      sdk.renameSession = renameSession;
+      const client = v2Client();
+      await client.app.connectWith(connectRouter(), async (agent) => {
+        await initializeV2(agent);
+        const { sessionId } = await agent.request(v2.methods.agent.session.new, { cwd });
+        client.sessionUpdates.length = 0;
+        const response = await agent.request(v2.methods.agent.session.setTitle, {
+          sessionId,
+          title: "  Investigate\n OAuth   timeout ",
+        });
+        expect(response).toEqual({ title: "Investigate OAuth timeout" });
+        expect(renameSession).toHaveBeenCalledWith("Investigate OAuth timeout", sessionId);
+        expect(client.sessionUpdates).toEqual([
+          {
+            sessionId,
+            update: { sessionUpdate: "session_info_update", title: "Investigate OAuth timeout" },
+          },
+        ]);
+        await client.authUpdate(1);
+      });
+    });
+
+    it("titles the query that a resume started while the rename ran", async () => {
+      let release!: () => void;
+      const renameSession = vi.fn(async (_title: string, _sessionId?: string) => {
+        if (renameSession.mock.calls.length === 1) {
+          await new Promise<void>((resolve) => (release = resolve));
+        }
+      });
+      sdk.renameSession = renameSession;
+      const client = v2Client();
+      await client.app.connectWith(connectRouter(), async (agent) => {
+        await initializeV2(agent);
+        const { sessionId } = await agent.request(v2.methods.agent.session.new, { cwd });
+        const renamed = agent.request(v2.methods.agent.session.setTitle, {
+          sessionId,
+          title: "Mine",
+        });
+        await vi.waitFor(() => expect(renameSession).toHaveBeenCalledTimes(1));
+        await agent.request(v2.methods.agent.session.close, { sessionId });
+        await agent.request(v2.methods.agent.session.resume, { sessionId, cwd });
+        release();
+        expect(await renamed).toEqual({ title: "Mine" });
+        expect(renameSession.mock.calls).toEqual([
+          ["Mine", sessionId],
+          ["Mine", sessionId],
+        ]);
+        await client.authUpdate(1);
+      });
+    });
+
+    it("titles a stored session that is not active in its transcript", async () => {
+      const sessionId = randomUUID();
+      const dir = path.join(tempDir, "claude", "projects", encodeProjectPath(cwd));
+      await mkdir(dir, { recursive: true });
+      const file = path.join(dir, `${sessionId}.jsonl`);
+      const prompt = { type: "user", sessionId, cwd, message: { role: "user", content: "hi" } };
+      await writeFile(file, JSON.stringify(prompt) + "\n");
+      const { app, authUpdate } = v2Client();
+      await app.connectWith(connectRouter(), async (agent) => {
+        await initializeV2(agent);
+        expect(
+          await agent.request(v2.methods.agent.session.setTitle, { sessionId, title: "Stored" }),
+        ).toEqual({ title: "Stored" });
+        await authUpdate(1);
+      });
+      const records = (await readFile(file, "utf8"))
+        .trim()
+        .split("\n")
+        .slice(-2)
+        .map((line) => JSON.parse(line));
+      expect(records).toEqual([
+        { type: "custom-title", customTitle: "Stored", sessionId },
+        { type: "agent-name", agentName: "Stored", sessionId },
+      ]);
+    });
+
+    it.each([
+      ["an unknown session", { sessionId: randomUUID(), title: "Title" }, -32002],
+      ["a title that is empty once normalized", { sessionId: randomUUID(), title: " \n " }, -32602],
+    ])("refuses %s", async (_case, params, code) => {
+      const { app, authUpdate } = v2Client();
+      await app.connectWith(connectRouter(), async (agent) => {
+        await initializeV2(agent);
+        await expect(
+          agent.request(v2.methods.agent.session.setTitle, params),
+        ).rejects.toMatchObject({ code });
+        await authUpdate(1);
+      });
+    });
+  });
+
  it("offers a resumed Fable 5.2 session's model as `fable`, as a new session lists it", async () => {
    // On resume, the CLI lists the transcript's Fable row under its id, with no `fable` row.
    const row = (value: string, resolvedModel: string, displayName: string) => ({
@@ -5677,6 +5913,57 @@ describe("ACP v2 requests that subagents make", () => {
      ]);
    });

+    it("refuses session/status of a subagent's session, which does not advertise it", async () => {
+      let finish!: () => void;
+      const finished = new Promise<void>((resolve) => {
+        finish = resolve;
+      });
+      scriptTurns(async function* (options) {
+        yield toolUseMessage(options, "toolu_agent-1", "Agent", {
+          description: "Explore the project",
+          prompt: "Look around",
+          subagent_type: "Explore",
+        });
+        yield taskStarted(options, "agent-1", { prompt: "Look around" });
+        await finished;
+        yield taskNotification(options, "agent-1", {});
+        yield result(options);
+        yield idleState(options);
+      });
+      const client = v2Client();
+      await client.app.connectWith(connectRouter(), async (agent) => {
+        await initializeV2(agent);
+        const { sessionId } = await agent.request(v2.methods.agent.session.new, { cwd });
+        await agent.request(v2.methods.agent.session.prompt, { sessionId, prompt: text("hi") });
+        await vi.waitFor(() =>
+          expect(
+            client.sessionUpdates.some(
+              (notification) =>
+                notification.sessionId === "agent-1" &&
+                notification.update.sessionUpdate === "state_update",
+            ),
+          ).toBe(true),
+        );
+
+        await expect(
+          agent.request(v2.methods.agent.session.status, { sessionId: "agent-1" }),
+        ).rejects.toMatchObject({
+          code: -32602,
+          message: expect.stringContaining("agent-1 is a subagent session"),
+        });
+
+        finish();
+        await vi.waitFor(() =>
+          expect(
+            client
+              .updates("state_update")
+              .some((update) => (update as { state: string }).state === "idle"),
+          ).toBe(true),
+        );
+        await client.authUpdate(1);
+      });
+    });
+
    it("sends a live child's configuration again after a replay's response, when the replay sent another", async () => {
      scriptTurns(async function* (options) {
        yield toolUseMessage(options, "toolu_agent-1", "Agent", {
@@ -9379,6 +9666,48 @@ describe("ACP v2 auth", () => {
    expect(acpAuthUpdates).toEqual([status]);
  });

+  it.each(["max_5x", undefined, "future_tier"])(
+    "keeps Ultra across session reads and refreshes the label for CLI tier %j",
+    async (nextTier) => {
+      let planTier: string | undefined = "max_20x";
+      execFileSpy.mockImplementation((...invocation: unknown[]) => {
+        const callback = invocation[invocation.length - 1] as (...a: unknown[]) => void;
+        callback(null, {
+          stdout: JSON.stringify({ ...JSON.parse(CLI_SUBSCRIPTION), planTier }),
+          stderr: "",
+        });
+      });
+      const account = {
+        apiProvider: "firstParty",
+        subscriptionType: "Claude Max",
+        email: "user@example.com",
+      };
+      const initializationResult = sdk.initializationResult;
+      sdk.initializationResult = async () => ({ ...(await initializationResult()), account });
+      sdk.accountInfo = async () => account;
+      const { app, authUpdate, acpAuthUpdates } = v2Client();
+      await app.connectWith(connectRouter(), async (agent) => {
+        await initializeV2(agent);
+        expect((await authUpdate(1)).authStatus.label).toBe("Claude Ultra");
+        await agent.request(v2.methods.agent.session.new, { cwd });
+        expect(await agent.request(v2.methods.agent.auth.status, {})).toMatchObject({
+          accounts: [{ label: "Claude Ultra" }],
+        });
+        expect(
+          acpAuthUpdates.every((update) => update.accounts?.[0].label === "Claude Ultra"),
+        ).toBe(true);
+
+        planTier = nextTier;
+        await agent.request(v2.methods.agent.auth.status, {});
+        await vi.waitFor(() =>
+          expect(acpAuthUpdates.at(-1)).toMatchObject({
+            accounts: [{ label: "Claude Max", _meta: { claudeCode: { plan: "max" } } }],
+          }),
+        );
+      });
+    },
+  );
+
  /**
   * In a remote environment with --hide-claude-auth, initialize offers the
   * console login as a terminal method and hides the TUI subscription login.
--- a/src/tests/v2/v2.test.ts
+++ b/src/tests/v2/v2.test.ts
@@ -1012,6 +1012,30 @@ describe("ACP v2 core", () => {
    });
  });

+  it("stays idle at the echo of a model change's local command output", async () => {
+    const client = v2Client();
+    await client.connect(async (agent) => {
+      const { claude } = await openSession(agent);
+      // As the bundled CLI sends it after `setModel`, with no turn: no
+      // `command_lifecycle` frame, result or `session_state_changed` follows.
+      claude.send({
+        type: "user",
+        message: {
+          role: "user",
+          content:
+            "<local-command-stdout>Set model to `haiku (claude-haiku-5-5)`</local-command-stdout>",
+        },
+        parent_tool_use_id: null,
+        uuid: randomUUID(),
+        session_id: "session",
+        timestamp: new Date().toISOString(),
+        isReplay: true,
+      });
+      await new Promise((resolve) => setTimeout(resolve, 20));
+      expect(client.states()).toEqual([]);
+    });
+  });
+
  it("forwards the result of a local command, which streamed no text", async () => {
    const client = v2Client();
    await client.connect(async (agent) => {
@@ -2119,6 +2143,44 @@ describe("ACP v2 core", () => {
    });
  });

+  it.each([
+    ["a notice when the turn goes on to end", { result: "" }, "end_turn", 1],
+    ["a notice once when the result repeats its text", {}, "end_turn", 1],
+    ["the idle's error when the turn fails", { is_error: true }, "error", 0],
+  ])(
+    "reports Claude Code's message for a failed API request as %s, not as Claude's text",
+    async (_, fields, stopReason, notices) => {
+      const text = "API Error: Connection lost mid-response. The response above may be incomplete.";
+      const client = v2Client();
+      await client.connect(async (agent) => {
+        const { claude } = await openSession(agent);
+        claude.send(cycleStart());
+        claude.send({
+          ...assistant("msg_api_error", [{ type: "text", text }]),
+          message: {
+            id: "msg_api_error",
+            type: "message",
+            role: "assistant",
+            model: "<synthetic>",
+            content: [{ type: "text", text }],
+            usage: {},
+          },
+          error: "server_error",
+        });
+        claude.send(result({ result: text, ...fields }));
+        await vi.waitFor(() => expect(client.states()).toEqual(["running", "idle"]));
+      });
+
+      expect(
+        client.sessionUpdates.filter((update) => update.sessionUpdate === "agent_message_chunk"),
+      ).toEqual([]);
+      expect(client.sessionUpdates.filter((update) => update.sessionUpdate === "notice")).toEqual(
+        Array(notices).fill({ sessionUpdate: "notice", severity: "error", title: text }),
+      );
+      expect(client.sessionUpdates.at(-1)).toMatchObject({ state: "idle", stopReason });
+    },
+  );
+
  it.each([
    [
      "an error at the turn limit",
--- a/src/v1/acp-agent.ts
+++ b/src/v1/acp-agent.ts
@@ -1,15 +1,12 @@
 import {
  agent as acpAgent,
  AgentApp,
-  AgentContext,
  AuthenticateRequest,
  AuthMethod,
  AuthStatusResponse,
-  AuthStatusUpdateNotification,
  AvailableCommand,
  CancelNotification,
  ClientCapabilities,
-  CompleteElicitationNotification,
  CreateElicitationRequest,
  CreateElicitationResponse,
  DisableProviderRequest,
@@ -36,7 +33,6 @@ import {
  RequestError,
  SetProviderRequest,
  SetProviderResponse,
-  RequestPermissionRequest,
  RequestPermissionResponse,
  ResumeSessionRequest,
  ResumeSessionResponse,
@@ -47,9 +43,13 @@ import {
  SetSessionConfigOptionResponse,
  SetSessionModeRequest,
  SetSessionModeResponse,
+  SessionStatusRequest,
+  SessionStatusResponse,
  CloseSessionRequest,
  CloseSessionResponse,
  DeleteSessionRequest,
+  SetSessionTitleRequest,
+  SetSessionTitleResponse,
  DeleteSessionResponse,
  WriteTextFileRequest,
  WriteTextFileResponse,
@@ -95,6 +95,7 @@ import {
 } from "./goal-extension.js";
 import { checklistPlanUpdate, resetPlanUpdates, type SubagentChecklists } from "../plans.js";
 import { PromptSuggestions } from "../prompt-suggestions.js";
+import { savedSessionStatus, SESSION_STATUS_CAPABILITY } from "../session-status.js";
 import { sanitizeTitle, SessionTitles } from "../session-titles.js";
 import {
  AIR_NATIVE_SUBAGENT_SESSIONS_CAPABILITY,
@@ -134,16 +135,16 @@ import {
  clientSupportsAirCapability,
  withAirMeta,
 } from "../air-extension.js";
-import * as sessionIndex from "./session-index/connection.js";
+import * as sessionIndex from "./session-index.js";
 import type {
  BatchGetSessionsRequest,
  RenameSessionRequest,
  SessionIdRequest,
-} from "./session-index/service.js";
+} from "../session-index/service.js";
 import type {
  ListSubscribeRequest,
  ListUnsubscribeRequest,
-} from "./session-index/list-subscriptions.js";
+} from "../session-index/list-subscriptions.js";
 import {
  AsyncTaskRuntime,
  backgroundBashTaskFromToolResult,
@@ -305,7 +306,7 @@ import {
 } from "../session-usage.js";
 import { previewPatchContent } from "../diff.js";
 import { backgroundedBashToolCall, withRunningTerminal } from "../tool-calls/background.js";
-import { ChangedMetaFilter } from "./tool-calls/changed-meta-filter.js";
+import { ChangedMetaClient, ClientConnection } from "./client-connection.js";
 import { ToolCallFieldTracker } from "../tool-calls/field-tracker.js";
 import { ClientCapabilities as ToolCallClientCapabilities } from "../tool-calls/client-capabilities.js";
 import {
@@ -1751,116 +1752,6 @@ const LIMIT_FAILURE_CATEGORY = {
  error_max_structured_output_retries: "provider_error",
 } as const satisfies Record<string, ClaudeFailureKind>;

-/**
- * Bridges {@link AcpClient} to the connection-scoped {@link AgentContext}
- * exposed by `AgentApp.connect(...)` as `connection.client`. The peer handle is
- * valid for the entire connection lifetime, so it is captured once at
- * construction.
- */
-class ClientConnection implements AcpClient {
-  constructor(private readonly ctx: AgentContext) {}
-
-  sessionUpdate(params: AcpSessionNotification): Promise<void> {
-    return this.ctx.notify(methods.client.session.update, asSdkSessionNotification(params));
-  }
-
-  requestPermission(
-    params: RequestPermissionRequest,
-    signal?: AbortSignal,
-  ): Promise<RequestPermissionResponse> {
-    return this.ctx.request(methods.client.session.requestPermission, params, {
-      cancellationSignal: signal,
-      stopWaitingOnCancel: true,
-    });
-  }
-
-  readTextFile(params: ReadTextFileRequest): Promise<ReadTextFileResponse> {
-    return this.ctx.request(methods.client.fs.readTextFile, params);
-  }
-
-  writeTextFile(params: WriteTextFileRequest): Promise<WriteTextFileResponse> {
-    return this.ctx.request(methods.client.fs.writeTextFile, params);
-  }
-
-  createElicitation(
-    params: CreateElicitationRequest,
-    signal?: AbortSignal,
-  ): Promise<CreateElicitationResponse> {
-    return this.ctx.request(methods.client.elicitation.create, params, {
-      cancellationSignal: signal,
-      stopWaitingOnCancel: true,
-    });
-  }
-
-  completeElicitation(params: CompleteElicitationNotification): Promise<void> {
-    return this.ctx.notify(methods.client.elicitation.complete, params);
-  }
-
-  authStatusUpdate(params: AuthStatusUpdateNotification): Promise<void> {
-    return this.ctx.notify(methods.client.auth.statusUpdate, params);
-  }
-
-  extNotification(method: string, params: Record<string, unknown>): Promise<void> {
-    return this.ctx.notify(method, params);
-  }
-}
-
-/**
- * The client that the agent talks to. For an AIR client, every session update
- * passes the {@link ChangedMetaFilter} last, after the native subagent routing,
- * so a `tool_call_update` carries only the `_meta` keys that changed. ACP
- * merges only the top-level tool call fields, not the `_meta` keys. So another
- * client gets the full `_meta` on each update.
- */
-class ChangedMetaClient implements AcpClient {
-  private readonly filter = new ChangedMetaFilter();
-
-  constructor(
-    private readonly inner: AcpClient,
-    private readonly airClient: () => boolean,
-  ) {}
-
-  async sessionUpdate(params: AcpSessionNotification): Promise<void> {
-    if (!this.airClient()) return this.inner.sessionUpdate(params);
-    const update = this.filter.apply(params.update as SessionNotification["update"]);
-    if (update) await this.inner.sessionUpdate({ ...params, update } as AcpSessionNotification);
-  }
-
-  requestPermission(
-    params: AcpPermissionRequest,
-    signal?: AbortSignal,
-  ): Promise<RequestPermissionResponse> {
-    return this.inner.requestPermission(params, signal);
-  }
-
-  readTextFile(params: ReadTextFileRequest): Promise<ReadTextFileResponse> {
-    return this.inner.readTextFile(params);
-  }
-
-  writeTextFile(params: WriteTextFileRequest): Promise<WriteTextFileResponse> {
-    return this.inner.writeTextFile(params);
-  }
-
-  createElicitation(
-    params: CreateElicitationRequest,
-    signal?: AbortSignal,
-  ): Promise<CreateElicitationResponse> {
-    return this.inner.createElicitation(params, signal);
-  }
-
-  completeElicitation(params: CompleteElicitationNotification): Promise<void> {
-    return this.inner.completeElicitation(params);
-  }
-
-  authStatusUpdate(params: AuthStatusUpdateNotification): Promise<void> {
-    return this.inner.authStatusUpdate(params);
-  }
-
-  extNotification(method: string, params: Record<string, unknown>): Promise<void> {
-    return this.inner.extNotification(method, params);
-  }
-}
-
 function raceWithAbort<T>(operation: Promise<T>, signal: AbortSignal): Promise<T> {
  return new Promise<T>((resolve, reject) => {
    const cleanup = () => signal.removeEventListener("abort", onAbort);
@@ -2134,7 +2025,10 @@ export class ClaudeAcpAgent {
      fork: {},
      list: {},
      resume: {},
+      status: SESSION_STATUS_CAPABILITY,
      systemPrompt: SYSTEM_PROMPT_CAPABILITY,
+      // `session/set_title`.
+      title: {},
      ...(this.toolCallCapabilities.air.client ? { subagents: {} } : {}),
    };

@@ -7973,6 +7867,24 @@ export class ClaudeAcpAgent {
    return {};
  }

+  /**
+   * `session/status`: `open` for a session that this connection holds. A held
+   * session whose query ended (`queryClosed`) is `open` too: a `session/load`
+   * with the same params returns it as it is, and its prompts fail with what
+   * happened. Every other session is `saved` or unknown by its stored
+   * transcript (see `session-status.ts`). A subagent's session is unknown,
+   * as for the other session requests.
+   */
+  async sessionStatus({ sessionId }: SessionStatusRequest): Promise<SessionStatusResponse> {
+    if (Object.hasOwn(this.sessions, sessionId)) return { status: "open" };
+    return savedSessionStatus(sessionId);
+  }
+
+  /** See {@link sessionIndex.SessionIndexConnection.setTitle}. */
+  setSessionTitle(params: SetSessionTitleRequest): Promise<SetSessionTitleResponse> {
+    return this.sessionIndex.setTitle(params);
+  }
+
  /** Per client: see {@link sessionIndex.SessionIndexConnection.deleteSession}. */
  async deleteSession(params: DeleteSessionRequest): Promise<DeleteSessionResponse> {
    return this.sessionIndex.deleteSession(params);
@@ -11246,8 +11158,10 @@ export function v1AgentApp(
    )
    .onRequest(methods.agent.session.list, (ctx) => agent.listSessions(ctx.params))
    .onRequest(methods.agent.session.delete, (ctx) => agent.deleteSession(ctx.params))
+    .onRequest(methods.agent.session.setTitle, (ctx) => agent.setSessionTitle(ctx.params))
    .onRequest(methods.agent.session.resume, (ctx) => agent.resumeSession(ctx.params))
    .onRequest(methods.agent.session.close, (ctx) => agent.closeSession(ctx.params))
+    .onRequest(methods.agent.session.status, (ctx) => agent.sessionStatus(ctx.params))
    .onRequest(methods.agent.session.setMode, (ctx) => agent.setSessionMode(ctx.params))
    .onRequest(methods.agent.session.setConfigOption, (ctx) =>
      agent.setSessionConfigOption(ctx.params),
--- a/src/v1/client-connection.ts
+++ b/src/v1/client-connection.ts
@@ -0,0 +1,129 @@
+import {
+  AgentContext,
+  AuthStatusUpdateNotification,
+  CompleteElicitationNotification,
+  CreateElicitationRequest,
+  CreateElicitationResponse,
+  methods,
+  ReadTextFileRequest,
+  ReadTextFileResponse,
+  RequestPermissionRequest,
+  RequestPermissionResponse,
+  SessionNotification,
+  WriteTextFileRequest,
+  WriteTextFileResponse,
+} from "@agentclientprotocol/sdk/unstable";
+import type { AcpClient } from "../acp-client.js";
+import { AcpSessionNotification, asSdkSessionNotification } from "../acp-subagents.js";
+import { ChangedMetaFilter } from "./tool-calls/changed-meta-filter.js";
+import type { AcpPermissionRequest } from "../permissions/presentation.js";
+
+/**
+ * Bridges {@link AcpClient} to the connection-scoped {@link AgentContext}
+ * exposed by `AgentApp.connect(...)` as `connection.client`. The peer handle is
+ * valid for the entire connection lifetime, so it is captured once at
+ * construction.
+ */
+export class ClientConnection implements AcpClient {
+  constructor(private readonly ctx: AgentContext) {}
+
+  sessionUpdate(params: AcpSessionNotification): Promise<void> {
+    return this.ctx.notify(methods.client.session.update, asSdkSessionNotification(params));
+  }
+
+  requestPermission(
+    params: RequestPermissionRequest,
+    signal?: AbortSignal,
+  ): Promise<RequestPermissionResponse> {
+    return this.ctx.request(methods.client.session.requestPermission, params, {
+      cancellationSignal: signal,
+      stopWaitingOnCancel: true,
+    });
+  }
+
+  readTextFile(params: ReadTextFileRequest): Promise<ReadTextFileResponse> {
+    return this.ctx.request(methods.client.fs.readTextFile, params);
+  }
+
+  writeTextFile(params: WriteTextFileRequest): Promise<WriteTextFileResponse> {
+    return this.ctx.request(methods.client.fs.writeTextFile, params);
+  }
+
+  createElicitation(
+    params: CreateElicitationRequest,
+    signal?: AbortSignal,
+  ): Promise<CreateElicitationResponse> {
+    return this.ctx.request(methods.client.elicitation.create, params, {
+      cancellationSignal: signal,
+      stopWaitingOnCancel: true,
+    });
+  }
+
+  completeElicitation(params: CompleteElicitationNotification): Promise<void> {
+    return this.ctx.notify(methods.client.elicitation.complete, params);
+  }
+
+  authStatusUpdate(params: AuthStatusUpdateNotification): Promise<void> {
+    return this.ctx.notify(methods.client.auth.statusUpdate, params);
+  }
+
+  extNotification(method: string, params: Record<string, unknown>): Promise<void> {
+    return this.ctx.notify(method, params);
+  }
+}
+
+/**
+ * The client that the agent talks to. For an AIR client, every session update
+ * passes the {@link ChangedMetaFilter} last, after the native subagent routing,
+ * so a `tool_call_update` carries only the `_meta` keys that changed. ACP
+ * merges only the top-level tool call fields, not the `_meta` keys. So another
+ * client gets the full `_meta` on each update.
+ */
+export class ChangedMetaClient implements AcpClient {
+  private readonly filter = new ChangedMetaFilter();
+
+  constructor(
+    private readonly inner: AcpClient,
+    private readonly airClient: () => boolean,
+  ) {}
+
+  async sessionUpdate(params: AcpSessionNotification): Promise<void> {
+    if (!this.airClient()) return this.inner.sessionUpdate(params);
+    const update = this.filter.apply(params.update as SessionNotification["update"]);
+    if (update) await this.inner.sessionUpdate({ ...params, update } as AcpSessionNotification);
+  }
+
+  requestPermission(
+    params: AcpPermissionRequest,
+    signal?: AbortSignal,
+  ): Promise<RequestPermissionResponse> {
+    return this.inner.requestPermission(params, signal);
+  }
+
+  readTextFile(params: ReadTextFileRequest): Promise<ReadTextFileResponse> {
+    return this.inner.readTextFile(params);
+  }
+
+  writeTextFile(params: WriteTextFileRequest): Promise<WriteTextFileResponse> {
+    return this.inner.writeTextFile(params);
+  }
+
+  createElicitation(
+    params: CreateElicitationRequest,
+    signal?: AbortSignal,
+  ): Promise<CreateElicitationResponse> {
+    return this.inner.createElicitation(params, signal);
+  }
+
+  completeElicitation(params: CompleteElicitationNotification): Promise<void> {
+    return this.inner.completeElicitation(params);
+  }
+
+  authStatusUpdate(params: AuthStatusUpdateNotification): Promise<void> {
+    return this.inner.authStatusUpdate(params);
+  }
+
+  extNotification(method: string, params: Record<string, unknown>): Promise<void> {
+    return this.inner.extNotification(method, params);
+  }
+}
--- a/src/v1/session-index/connection.ts
+++ b/src/v1/session-index/connection.ts
@@ -15,11 +15,12 @@ import {
  type InitializeRequest,
  type ListSessionsRequest,
  type ListSessionsResponse,
+  type SetSessionTitleRequest,
+  type SetSessionTitleResponse,
 } from "@agentclientprotocol/sdk/unstable";
-import type { Query } from "@anthropic-ai/claude-agent-sdk";
-import type { Session } from "../acp-agent.js";
-import type { AcpClient } from "../../acp-client.js";
-import type { Logger } from "../../logger.js";
+import type { Session } from "./acp-agent.js";
+import type { AcpClient } from "../acp-client.js";
+import type { Logger } from "../logger.js";
 import {
  AIR_SESSION_ARCHIVE_CAPABILITY,
  AIR_SESSION_BATCH_GET_CAPABILITY,
@@ -29,9 +30,10 @@ import {
  AIR_SESSION_WORKTREES_CAPABILITY,
  clientSupportsAirCapability,
  withAirMeta,
-} from "../../air-extension.js";
-import type { OwnSessionState } from "./activity.js";
-import { isArchivedTitle, storedTitle, visibleTitle } from "./archive-title.js";
+} from "../air-extension.js";
+import type { OwnSessionState } from "../session-index/activity.js";
+import { isArchivedTitle, visibleTitle } from "../session-index/archive-title.js";
+import { renameSession, retitleSession, type RetitledSession } from "../session-index/rename.js";
 import {
  LIST_CHANGES_METHOD,
  LIST_SUBSCRIBE_METHOD,
@@ -41,12 +43,11 @@ import {
  type ListSubscribeRequest,
  type ListSubscribeResponse,
  type ListUnsubscribeRequest,
-} from "./list-subscriptions.js";
+} from "../session-index/list-subscriptions.js";
 import {
  archiveInsteadOfDelete,
  deleteSessionIfStored,
  archiveTo,
-  renameTo,
  parseRenameSessionRequest,
  parseSessionIdRequest,
  parseBatchGetSessionsRequest,
@@ -55,13 +56,12 @@ import {
  SESSION_RENAME_METHOD,
  SESSION_UNARCHIVE_METHOD,
  SessionIndexService,
+  transcriptWriter,
  type RenameSessionRequest,
-  type RetitleOptions,
  type SessionIdRequest,
-  type TitleChange,
  type BatchGetSessionsRequest,
  type BatchGetSessionsResponse,
-} from "./service.js";
+} from "../session-index/service.js";

 /** What the session index keeps on each `Session`. */
 export type SessionIndexFields = {
@@ -115,9 +115,9 @@ export class SessionIndexConnection {
   * exactly as before.
   */
  service?: SessionIndexService;
-  /** The archive behind `session/delete` of an AIR client without
-   *  `sessionIndex`: the same writes, without a list or a watcher. */
-  private archiver?: SessionIndexService;
+  /** The transcript writes of a client without `sessionIndex` (see
+   *  {@link transcriptWriter}). */
+  private transcripts?: SessionIndexService;
  /** When the query of a session failed here, by session id. */
  private readonly failedQueries = new Map<string, number>();

@@ -250,24 +250,34 @@ export class SessionIndexConnection {
    return sessions.filter((session) => !isArchivedTitle(session.customTitle));
  }

-  /** `_session/rename`: names a session; no generated title replaces it.
-   *  An archived session stays archived. */
+  /** `_session/rename` of a `sessionIndex` client (see {@link renameSession}). */
  async rename(request: RenameSessionRequest): Promise<EmptyResponse> {
-    const index = this.requireService(SESSION_RENAME_METHOD);
-    const { sessionId } = request;
-    // As the CLI keeps it, and never with the archive prefix: a rename does
-    // not change the archive state.
-    const title = storedTitle(request.title, false, sessionId);
-    // The title as stored: an archived one is cut with its prefix.
-    const shown = (stored: string | undefined) =>
-      stored === undefined ? title : visibleTitle(stored);
-    await this.retitle(index, sessionId, renameTo(title), shown, {
-      mayBeUnwritten: true,
-      sidecar: "always",
-    });
+    await this.renameWith(this.requireService(SESSION_RENAME_METHOD), request);
    return {};
  }

+  /** `session/set_title`, for every client: the rename of `_session/rename`,
+   *  without the session index of a client that did not ask for it. */
+  async setTitle(request: SetSessionTitleRequest): Promise<SetSessionTitleResponse> {
+    const title = await this.renameWith(
+      this.service ?? this.writer(),
+      parseRenameSessionRequest(request),
+    );
+    return { title };
+  }
+
+  private renameWith(index: SessionIndexService, request: RenameSessionRequest): Promise<string> {
+    return renameSession(index, request, this.loaded(request.sessionId), (stored) =>
+      this.clientTitle(stored),
+    );
+  }
+
+  /** The session loaded here, as a rename reaches it. */
+  private loaded(sessionId: string): RetitledSession | undefined {
+    const session = this.host.agent.sessions[sessionId];
+    return session && { session, titles: session.titles };
+  }
+
  /** `_session/archive`: hides a session from the default list and stops
   *  it. Idempotent; the session need not be loaded. A session loaded here
   *  is interrupted, retitled through its CLI while that still runs, then
@@ -279,7 +289,7 @@ export class SessionIndexConnection {
    // No turn goes on after the archive: the interrupt goes to the CLI ahead
    // of the rename.
    if (loaded) await this.host.interruptSession(sessionId);
-    await this.retitle(index, sessionId, archiveTo(true), undefined, {
+    await retitleSession(index, sessionId, archiveTo(true), undefined, this.loaded(sessionId), {
      mayBeUnwritten: this.isUnwrittenSession(sessionId),
      sidecar: "existing",
    });
@@ -308,7 +318,7 @@ export class SessionIndexConnection {
  async unarchive(params: SessionIdRequest): Promise<EmptyResponse> {
    const index = this.requireService(SESSION_UNARCHIVE_METHOD);
    const { sessionId } = params;
-    await this.retitle(index, sessionId, archiveTo(false), undefined, {
+    await retitleSession(index, sessionId, archiveTo(false), undefined, this.loaded(sessionId), {
      mayBeUnwritten: this.isUnwrittenSession(sessionId),
      sidecar: "existing",
    });
@@ -316,58 +326,6 @@ export class SessionIndexConnection {
    return {};
  }

-  /**
-   * Retitles a session (see {@link SessionIndexService.retitle}). A session
-   * this connection runs is titled through its CLI (`rename_session`). A
-   * loaded session's title state takes the change as a client title, so no
-   * generated title replaces it; `publish` is the title it then publishes.
-   */
-  private async retitle(
-    index: SessionIndexService,
-    sessionId: string,
-    change: TitleChange,
-    publish: Parameters<Session["titles"]["setExplicitTitle"]>[0],
-    options: Pick<RetitleOptions, "mayBeUnwritten" | "sidecar">,
-  ): Promise<void> {
-    const session = this.host.agent.sessions[sessionId];
-    // Decided once a title generation in flight has ended: the query may
-    // have closed meanwhile.
-    const persist = () => {
-      const query = session?.query as
-        | (Query & { renameSession?: (title: string, sessionId?: string) => Promise<void> })
-        | undefined;
-      // A closed session's CLI is gone here: only a running query titles it.
-      const running = session !== undefined && !session.queryClosed;
-      if (running && typeof query?.renameSession !== "function") {
-        // Its CLI holds the title and would write it back over ours.
-        throw RequestError.invalidRequest(
-          { sessionId },
-          "The Claude Code CLI of this session cannot change its title while it runs.",
-        );
-      }
-      const live = running
-        ? {
-            cwd: session.cwd,
-            rename: (title: string) => query!.renameSession!(title, sessionId),
-            stored: () => session.titles.storedTitle,
-            remember: (title: string) => session.titles.rememberStoredTitle(title),
-            shown: session.titles.shownTitle,
-          }
-        : undefined;
-      return index.retitle(sessionId, change, {
-        ...options,
-        // Without its CLI, a session needs its transcript.
-        mayBeUnwritten: live !== undefined && options.mayBeUnwritten,
-        live,
-      });
-    };
-    if (session) {
-      await session.titles.setExplicitTitle(publish, persist);
-    } else {
-      await persist();
-    }
-  }
-
  /**
   * `session/delete`:
   * - A `sessionIndex` client deletes for real: every transcript, whoever
@@ -388,19 +346,19 @@ export class SessionIndexConnection {
    if (this.service) {
      await this.service.delete(params.sessionId, loaded);
    } else if (this.host.isAirClient()) {
-      await archiveInsteadOfDelete(params.sessionId, this.airArchiver());
+      await archiveInsteadOfDelete(params.sessionId, this.writer());
    } else {
-      await deleteSessionIfStored(params.sessionId);
+      // After a `session/set_title` of the session in flight.
+      await this.writer().exclusive(params.sessionId, () =>
+        deleteSessionIfStored(params.sessionId),
+      );
    }
    return {};
  }

-  private airArchiver(): SessionIndexService {
-    this.archiver ??= new SessionIndexService({
-      logError: (message, error) =>
-        this.host.agent.logger.error(`[session-index] ${message}:`, error),
-    });
-    return this.archiver;
+  private writer(): SessionIndexService {
+    this.transcripts ??= transcriptWriter(this.host.agent.logger);
+    return this.transcripts;
  }

  private requireService(method: string): SessionIndexService {
--- a/src/v2/agent.ts
+++ b/src/v2/agent.ts
@@ -44,6 +44,12 @@ import { mergeEffortSettings } from "../session-effort.js";
 import { configuredSettings, resolveThinkingConfig } from "../session-env.js";
 import { resolveInitialPermissionMode } from "../session-mode.js";
 import { sanitizeTitle } from "../session-titles.js";
+import { renameSession } from "../session-index/rename.js";
+import {
+  parseRenameSessionRequest,
+  transcriptWriter,
+  type SessionIndexService,
+} from "../session-index/service.js";
 import { SettingsManager } from "../settings.js";
 import { STARTUP_FAILURE_RESULTS_ENV, startupFailureError } from "../startup-failure.js";
 import { createPostToolUseHook } from "../tools.js";
@@ -58,6 +64,7 @@ import { modelSwitchHook, SessionConfig } from "./config.js";
 import { fileChangePreviewHook } from "./file-preview.js";
 import { canUseTool, denyingStoppedWork } from "./permissions.js";
 import { reportHooks } from "./reports.js";
+import { savedSessionStatus } from "../session-status.js";
 import { SessionRestarts, type SetupParams } from "./restarts.js";
 import { V2Session, type SessionConnection } from "./session.js";
 import {
@@ -106,7 +113,9 @@ export function v2AgentApp(
      .onRequest(v2.methods.agent.session.fork, ({ params }) => agent.forkSession(params))
      .onRequest(v2.methods.agent.session.list, ({ params }) => agent.listSessions(params))
      .onRequest(v2.methods.agent.session.close, ({ params }) => agent.closeSession(params))
+      .onRequest(v2.methods.agent.session.status, ({ params }) => agent.sessionStatus(params))
      .onRequest(v2.methods.agent.session.delete, ({ params }) => agent.deleteSession(params))
+      .onRequest(v2.methods.agent.session.setTitle, ({ params }) => agent.setTitle(params))
      .onRequest(v2.methods.agent.session.setConfigOption, ({ params }) =>
        agent.setConfigOption(params),
      )
@@ -152,6 +161,8 @@ class V2Agent implements AgentHandle, SessionConnection {
  private readonly guard: SubscriptionGuard;
  /** The restarts of the sessions' queries, for a new route or account (see `restarts.ts`). */
  private readonly restarts: SessionRestarts;
+  /** The transcript writes of `session/set_title`, made at its first call (see `transcriptWriter`). */
+  private transcripts: SessionIndexService | undefined;
  /** What the client declared in `initialize`. */
  private clientCapabilities: v2.ClientCapabilities | null | undefined;
  /** The elicitation modes that the client advertised in `initialize`. */
@@ -452,6 +463,25 @@ class V2Agent implements AgentHandle, SessionConnection {
      : { sessions };
  }

+  /**
+   * `session/status`. `open`, with its foreground state, for a session whose
+   * query runs here. Every other session is `saved` or unknown by its stored
+   * transcript (see `session-status.ts`): one that a resume is still
+   * starting, and one whose query ended without `session/close`, which a
+   * resume starts again.
+   *
+   * A subagent's session does not advertise `status`, and is refused like
+   * its other requests. Its parent's `subagent_update` reports its state.
+   *
+   * It waits for no resume, restart or close, and changes nothing.
+   */
+  async sessionStatus({ sessionId }: v2.SessionStatusRequest): Promise<v2.SessionStatusResponse> {
+    const session = this.sessions.get(sessionId);
+    if (session) return { status: "open", state: session.statusState() };
+    if (this.ownerOfChild(sessionId)) throw restrictedChild(sessionId, "ask the status of");
+    return savedSessionStatus(sessionId);
+  }
+
  /** Closing is idempotent: a session that is not active closes at once. */
  async closeSession({ sessionId }: v2.CloseSessionRequest): Promise<v2.CloseSessionResponse> {
    if (this.ownerOfChild(sessionId)) throw restrictedChild(sessionId, "close");
@@ -481,7 +511,9 @@ class V2Agent implements AgentHandle, SessionConnection {
    const live = this.sessions.get(sessionId);
    if (live || this.stopped.has(sessionId)) await this.closeSession({ sessionId });
    try {
-      await deleteSession(sessionId, live ? { dir: live.cwd } : undefined);
+      // After a `session/set_title` of the session in flight.
+      const remove = () => deleteSession(sessionId, live ? { dir: live.cwd } : undefined);
+      await (this.transcripts ? this.transcripts.exclusive(sessionId, remove) : remove());
    } catch (error) {
      // A session without a transcript, such as one never prompted, has nothing to delete.
      if (error instanceof Error && /not found/i.test(error.message)) return {};
@@ -490,6 +522,30 @@ class V2Agent implements AgentHandle, SessionConnection {
    return {};
  }

+  /**
+   * `session/set_title`, as the v1 core does it (see `session-index/rename.ts`).
+   * The session need not be active. An active one publishes the title, and no
+   * generated title replaces it.
+   */
+  async setTitle(params: v2.SetSessionTitleRequest): Promise<v2.SetSessionTitleResponse> {
+    const request = parseRenameSessionRequest(params);
+    const { sessionId } = request;
+    if (this.ownerOfChild(sessionId)) throw restrictedChild(sessionId, "retitle");
+    // Renamed through the query that runs once a restart or resume settled.
+    await this.restarts.settled(sessionId);
+    await this.setupSettled(sessionId);
+    const writer = (this.transcripts ??= transcriptWriter(this.logger));
+    for (;;) {
+      const session = this.sessions.get(sessionId);
+      const title = await renameSession(writer, request, session?.reports.retitled());
+      // A restart or resume started another query of the session while the
+      // rename ran: its CLI may hold the old title and write it back, so it
+      // is renamed too. A session that only closed took the title already.
+      const now = this.sessions.get(sessionId);
+      if (now === undefined || now === session) return { title };
+    }
+  }
+
  async setConfigOption(
    params: v2.SetSessionConfigOptionRequest,
  ): Promise<v2.SetSessionConfigOptionResponse> {
--- a/src/v2/background.ts
+++ b/src/v2/background.ts
@@ -103,6 +103,17 @@ export class V2Background {
    return notification;
  }

+  /**
+   * `state` as the current work state of the session `sessionId`, with its
+   * list when it reports one: what {@link stamp} makes of the session's
+   * `state_update`. Unlike `stamp`, it does not count as a state that carried
+   * the list, so a later change of the list is reported as before.
+   */
+  snapshot(sessionId: string, state: WorkStateName): v2.StateUpdate {
+    const session = this.sessions.get(sessionId);
+    return session ? withBackground(currentState(state), session.items) : currentState(state);
+  }
+
  /**
   * Records the new list of a session, and returns the updates that report it:
   *
--- a/src/v2/initialize.ts
+++ b/src/v2/initialize.ts
@@ -6,6 +6,7 @@
 import type { AuthMethod } from "@agentclientprotocol/sdk/unstable";
 import type * as v2 from "@agentclientprotocol/sdk/experimental/v2/unstable";
 import { SYSTEM_PROMPT_CAPABILITY } from "../client-system-prompt.js";
+import { SESSION_STATUS_CAPABILITY } from "../session-status.js";

 /**
 * The session capabilities that the v2 core serves.
@@ -17,6 +18,7 @@ import { SYSTEM_PROMPT_CAPABILITY } from "../client-system-prompt.js";
 * - The prompt content and MCP transports that the v1 `initialize` lists too:
 *   images, embedded context, and HTTP servers. v2 has no SSE transport.
 * - `systemPrompt`, in `append` and `override` mode.
+ * - `session/status` (unstable), with the foreground state of an open session.
 */
 export const V2_SESSION_CAPABILITIES: v2.SessionCapabilities = {
  prompt: { image: {}, embeddedContext: {} },
@@ -25,6 +27,9 @@ export const V2_SESSION_CAPABILITIES: v2.SessionCapabilities = {
  fork: {},
  additionalDirectories: {},
  systemPrompt: SYSTEM_PROMPT_CAPABILITY,
+  status: SESSION_STATUS_CAPABILITY,
+  // `session/set_title`.
+  title: {},
 };

 /** v2 names the id of a method `methodId`, requires `type`, and lists `env` as name and value pairs. */
--- a/src/v2/outcome.ts
+++ b/src/v2/outcome.ts
@@ -17,7 +17,7 @@ import type {
 import { AUTONOMOUS_RESULT_ORIGINS } from "../result-end.js";
 import { isSyntheticLoginMessage } from "../message-filters.js";
 import { resultEnd } from "../result-end.js";
-import { providerFailureCategory } from "../session-failure-extension.js";
+import { assistantMessageText, providerFailureCategory } from "../session-failure-extension.js";
 import {
  getMatchingModelUsage,
  modelUsageIncrement,
@@ -109,8 +109,8 @@ function failed(error: RequestError): IdleOutcome {

 /**
 * What the assistant messages of the open turn reported about its end: the
- * error kind of a failed API request, Claude Code's sign-in message, and a
- * refusal's explanation. Read from the main conversation's messages.
+ * error kind and text of a failed API request, Claude Code's sign-in message,
+ * and a refusal's explanation. Read from the main conversation's messages.
 */
 export class TurnReport {
  errorKind: SDKAssistantMessageError | undefined;
@@ -118,12 +118,22 @@ export class TurnReport {
  loginRequired = false;
  /** The explanation of the turn's refusal. */
  refusalExplanation: string | undefined;
+  /**
+   * The text of the message that Claude Code wrote for a failed API request,
+   * e.g. "API Error: Connection lost mid-response. The response above may be
+   * incomplete.", until {@link takeApiError} reads it.
+   */
+  private apiError: string | undefined;

  /**
-   * An assistant message of the main conversation. Returns whether it is
-   * Claude Code's sign-in message, which the client is not shown: its
-   * `/login` instruction is for Claude Code's terminal, and the turn's idle
-   * fails with `authRequired` instead.
+   * An assistant message of the main conversation. Returns whether the
+   * client is not shown it as Claude's text:
+   *
+   * - Claude Code's sign-in message. Its `/login` instruction is for Claude
+   *   Code's terminal, and the turn's idle fails with `authRequired` instead.
+   * - The message that Claude Code wrote for a failed API request (`error` on
+   *   a `<synthetic>` message). The turn's idle carries it when the turn
+   *   fails, and a notice otherwise (see {@link takeApiError}).
   */
  assistant(message: SDKAssistantMessage): boolean {
    if (message.error) this.errorKind = message.error;
@@ -131,11 +141,24 @@ export class TurnReport {
      this.refusalExplanation =
        message.message.stop_details?.explanation ?? this.refusalExplanation;
    }
-    if (!isSyntheticLoginMessage(message.message)) return false;
-    this.loginRequired = true;
+    if (isSyntheticLoginMessage(message.message)) {
+      this.loginRequired = true;
+      return true;
+    }
+    if (!message.error || message.message.model !== "<synthetic>") return false;
+    const text = assistantMessageText(message.message);
+    if (!text) return false;
+    this.apiError = text;
    return true;
  }

+  /** The text of the turn's failed API request that no notice or idle reported yet. */
+  takeApiError(): string | undefined {
+    const text = this.apiError;
+    this.apiError = undefined;
+    return text;
+  }
+
  /**
   * Claude Code's `model_refusal_no_fallback`: the explanation when the
   * refused message carried none (older CLIs, gateways that drop
@@ -155,6 +178,7 @@ export class TurnReport {
    this.errorKind = undefined;
    this.loginRequired = false;
    this.refusalExplanation = undefined;
+    this.apiError = undefined;
  }
 }

--- a/src/v2/reports.ts
+++ b/src/v2/reports.ts
@@ -41,6 +41,7 @@ import {
  mcpServerStartupNotice,
  normalizeNoticeText,
  noticeUpdate,
+  splitNoticeText,
 } from "../session-notices.js";
 import {
  DEFAULT_CONTEXT_WINDOW,
@@ -52,6 +53,7 @@ import {
  type UsageSnapshot,
 } from "../session-usage.js";
 import { SessionTitles, type TitledSession } from "../session-titles.js";
+import type { RetitledSession } from "../session-index/rename.js";
 import type { SettingsManager } from "../settings.js";
 import { createTaskHook } from "../tools.js";
 import type { SessionOutput } from "./stream.js";
@@ -223,6 +225,24 @@ export class SessionReports {
    );
  }

+  /**
+   * A notice of the message that Claude Code wrote for a failed API request
+   * (see `TurnReport.takeApiError`). It is a turn's notice, so a result that
+   * repeats its text is not shown again.
+   */
+  apiError(text: string): void {
+    this.host.emit([
+      {
+        sessionId: this.host.sessionId,
+        update: noticeUpdate({
+          severity: "error",
+          ...splitNoticeText(text, "Claude reported an API error"),
+        }),
+      },
+    ]);
+    this.noticeTexts.push(normalizeNoticeText(text));
+  }
+
  /**
   * Claude Code's session state went `idle`: the idle compaction may arm, and
   * the title may have landed (see {@link SessionTitles.onTurnEnd}).
@@ -263,6 +283,13 @@ export class SessionReports {
    this.titles.onAssistantText(content);
  }

+  /** The session and its title state, as a client rename sets it
+   *  (`session/set_title`); undefined until it starts and once it ends. */
+  retitled(): RetitledSession | undefined {
+    const session = this.host.titledSession();
+    return session && { session, titles: this.titles };
+  }
+
  /** Sends the session's current title and `updatedAt`, as `session/resume` asks. */
  async publishTitle(): Promise<void> {
    const session = this.host.titledSession();
--- a/src/v2/session.ts
+++ b/src/v2/session.ts
@@ -60,6 +60,7 @@ import { Pushable } from "../utils.js";
 import { v1PromptRequest } from "./prompt.js";
 import { V2Background, stateUpdate as currentStateUpdate } from "./background.js";
 import type { V2UpdateTranslator } from "./update-translator.js";
+import { isLocalCommandOutput } from "../message-filters.js";
 import { MODEL_CONFIG_ID } from "../session-model.js";
 import { modelRefusalFallback, noticeUpdate } from "../session-notices.js";
 import { planModeUpdate } from "../exit-plan.js";
@@ -362,6 +363,15 @@ export class V2Session implements RequestTarget {
    ];
  }

+  /**
+   * The `state` of `session/status`: the foreground state now, with the
+   * session's list and without a stop reason. It sends nothing and changes
+   * nothing.
+   */
+  statusState(): v2.StateUpdate {
+    return this.background.snapshot(this.sessionId, this.foregroundState());
+  }
+
  /**
   * Replaces the session's MCP servers, as a resume of the active session
   * asks. The same servers stay as they are, connected.
@@ -917,7 +927,8 @@ export class V2Session implements RequestTarget {
        if (message.parent_tool_use_id === null) this.usage.assistant(message.message.model);
        if (this.stopped.drops(message)) return;
        if (message.parent_tool_use_id === null) {
-          // Claude Code's sign-in message is not shown (see `TurnReport`).
+          // Claude Code's sign-in message and its message for a failed API
+          // request are not shown as Claude's text (see `TurnReport`).
          if (this.turnReport.assistant(message)) return;
          this.outputStarts();
          this.reports.assistant(message);
@@ -929,6 +940,12 @@ export class V2Session implements RequestTarget {
        // in. A prompt Claude Code reported `started` for is inserted already.
        if ("isReplay" in message && message.isReplay) {
          if (message.uuid && message.parent_tool_use_id === null) {
+            // The output of a local command that Claude Code ran outside a
+            // turn, such as the "Set model to …" of a model change, is no
+            // prompt: no result or `command_lifecycle` frame would end its turn.
+            if (!this.pending.has(message.uuid) && isLocalCommandOutput(message.message.content)) {
+              return;
+            }
            // A message typed in another client of the session.
            const remote = this.remoteControl.remoteMessage(message);
            if (remote !== undefined) this.output.userMessage(remote, message.uuid);
@@ -1121,6 +1138,8 @@ export class V2Session implements RequestTarget {
      this.fastModeReported(message);
    }
    this.reports.result(message);
+    // Before the result's text below, which can repeat the failed request's.
+    this.reportApiError(end);
    // The turn goes on in a fresh context (see `ClearContext`).
    if (this.clearContext.holdsResult(message, end)) {
      this.turnReport.reset();
@@ -1172,6 +1191,19 @@ export class V2Session implements RequestTarget {
    return reporting.then(() => this.closeTurn());
  }

+  /**
+   * Sends the text of a failed API request that Claude Code wrote into the
+   * conversation (see `TurnReport.assistant`) as a notice. A turn whose idle
+   * fails sends none: its error carries the failure. `end` is the turn's
+   * result, if it has one.
+   */
+  private reportApiError(end: TurnEnd | undefined): void {
+    const text = this.turnReport.takeApiError();
+    if (!text) return;
+    if (idleOutcome(end, this.cancelledWork, this.turnReport).stopReason === "error") return;
+    this.reports.apiError(text);
+  }
+
  /**
   * Claude Code's `idle`. The one that follows a result is that result's, and
   * can come after the next cycle's first output. Any other ends the open
@@ -1281,6 +1313,8 @@ export class V2Session implements RequestTarget {
        if (request.coveredByCancel) request.abort.abort();
      }
    }
+    // A turn that ends without a result, such as an interrupted one.
+    this.reportApiError(this.lastEnd);
    this.reports.turnEnded();
    this.elicitations.turnEnded();
    this.fileChanges?.turnClosed(cancelled);
Author	SHA1	Message	Date
Ben Brandt	f5d79167a6	fix: keep a v2 session idle when the model changes between turns (#1586 ) On ACP v2, changing the model of an idle session left the session reporting `running` with no work in progress, and it never reported `idle` again until some later turn ended. A client that refuses prompts while the session is `running` could then never send the prompt that would end it. ## Cause After `setModel`, Claude Code echoes a user message that carries only the local command's output: ```json { "type": "user", "message": { "role": "user", "content": "<local-command-stdout>Set model to `haiku (claude-haiku-5-5)`</local-command-stdout>" }, "parent_tool_use_id": null, "uuid": "…", "isReplay": true } ``` The v2 session read every top-level echo as a prompt that Claude Code took in, and opened a turn for it. A model change runs no turn: no `command_lifecycle` frame, `result` or `session_state_changed` follows the echo, so nothing closed that turn. Captured against the bundled CLI (adapter 0.104.1): `state_update running` went out 18 ms after `session/set_config_option`, and no `idle` followed in the next 75 seconds. ## Fix An echo whose content is only local command output, and whose uuid is not one of the session's pending prompts, no longer opens a turn. The check is `isLocalCommandOutput` in `message-filters.ts`, next to the helpers that already recognize these markers. The pending-prompt exception keeps a client's own prompt working with a CLI that sends no `command_lifecycle` frames, where the echo is the only sign that the prompt was inserted. ## Scope - v2 only. The v1 core takes its state from `session_state_changed` and does not open turns at echoes. - I captured a model change. Other local commands that Claude Code runs outside a turn and echoes the same way are covered by the same check, but I did not capture them. ## Testing - New case in `src/tests/v2/v2.test.ts` sends the echo as the CLI sent it. Without the fix it fails with `expected [ 'running' ] to deeply equal []`. - Reran the capture against the bundled CLI with the fix: no `running` after either model change, and the next prompt ran `running` then `idle`. - `npm run check` and `npm run test:run` pass.	2026-11-10 18:49:50 +00:00
Ben Brandt	a4a8534c23	feat: serve session/set_title on ACP v1 and v2 (#1585 ) Implements the [`session/set_title` RFD](https://agentclientprotocol.com/rfds/session-set-title) on ACP v1 and v2. ## What clients get - v1 advertises `agentCapabilities.sessionCapabilities.title: {}` and v2 advertises `capabilities.session.title: {}`. Both serve `session/set_title` for every client. - The session does not need to be loaded. A session that runs on this connection is renamed through its CLI (`rename_session`). Any other session gets the `custom-title` and `agent-name` records in every copy of its transcript, plus the `custom-title.json` sidecar, as the CLI's `/rename` writes them. - The title is normalized the way `_session/rename` normalizes it: whitespace collapsed, cut to the CLI's 200 characters. The response carries the stored title, as that client's `session/list` shows it. On v1 an AIR client gets it without the `[archived] ` prefix. An archived session stays archived. - A loaded session publishes `session_info_update { title }`. A title generation in flight finishes first, and no generated title replaces the client's. - Errors: a title that is empty after normalization returns `-32602`. A session that is not loaded and has no transcript returns `-32002`. On v2, a subagent session is refused, as close and delete refuse it. ## Structure - The transcript writer behind `_session/rename` lived in `src/v1/session-index/`, which v2 cannot import. Everything there except `connection.ts` moves to the shared `src/session-index/` with no change beyond import paths. `connection.ts` becomes `src/v1/session-index.ts`. - `src/session-index/rename.ts` holds the rename logic that used to be in `SessionIndexConnection.rename`/`retitle`. `_session/rename` and `session/set_title` on both versions call it. - Clients without `sessionIndex` (and every v2 client) use a `SessionIndexService` with no list and no watcher (`transcriptWriter`). Their `session/delete` now runs inside that service's per-session `exclusive()`, so a delete cannot race a rename that is still appending records. - If a restart or resume starts a new query of a v2 session while a rename runs, v2 renames through the new query too. Its CLI could otherwise hold the old title and write it back. This doesn't use the SDK's top-level `renameSession()`. It writes only a `custom-title` record to the first copy of the transcript it finds, with no `agent-name` and no sidecar, so a session renamed earlier through `/rename` would keep its old name in the CLI and in AIR. ## Tests - v1 (`session-index.test.ts`): a stored session for a client without the session index; an archived session for three clients (AIR with `sessionIndex`, AIR without it, a client that is not AIR); unknown session and empty title. - v2 (`acp-v2.test.ts`): an active session through its CLI with the published update; a stored session's records; the rename that a resume overtakes; unknown session and empty title. - Golden files: only the `initialize` capability line changes. `compare.ts` now allows the `title` capability against the origin/main baseline. - Not run: `npm run test:integration` against the real CLI. The delete/rename ordering has no test, since it is a timing race.	2026-11-10 18:28:46 +00:00
Ben Brandt	6bc2e058cb	feat: serve session/status on v1 and v2 (#1584 ) Implements the unstable [Session status RFD](https://agentclientprotocol.com/rfds/session-status) on both agents, and advertises `status: {}` in the v1 `sessionCapabilities` and the v2 `capabilities.session`. ## What it answers \| Session \| v1 \| v2 \| \| --- \| --- \| --- \| \| Held by this connection \| `open` \| `open` with `state` \| \| Not held, non-empty transcript stored \| `saved` \| `saved` \| \| Not held, no transcript \| `-32002` with `data.sessionId` \| same \| \| Subagent session \| `-32002` \| `-32602`, as resume, close, fork and delete of one \| - The request starts no query, sends no update, and waits for no resume, restart or close. - On v2, `state` is the foreground state as a `state_update` snapshot holds it: with the session's `background` list and without a stop reason. `V2Background.snapshot` builds it without marking the list as reported, so a status request does not change which later `state_update`s go out. - `saved` or unknown is decided in the new shared `src/session-status.ts`: a non-empty `<sessionId>.jsonl` in any project directory. The request names no `cwd`, so a resume with another `cwd` can still fail with `-32002`. A directory that cannot be read for another reason than being absent fails the request and does not answer `-32002`. ## Behaviour to review - A v1 session whose query ended reads `open`. The connection still holds it, and a `session/load` with the same params returns it as it is, so `saved` would point the client at a resume that revives nothing. Its prompts fail with the "session ended" error. v2 drops such a session and answers from its transcript. - A session that was never prompted is unknown once it is closed. Claude Code writes the transcript at the first prompt, and a resume of it fails with `-32002` too. - A subagent session does not advertise `status`, so v2 refuses the request like its other requests, and v1 does not know the id. - `open` is per connection. Each connection has its own agent and its own Claude Code processes. ## Not done - The lookup does one `readdir` and one `stat` per project directory for each probe of a session that is not held. Sharing the v1 session index's cached scan is a follow-up. - Not run against the real CLI (`npm run test:integration`). ## Other changes - `isSessionId` and `projectsRoot` moved from `src/v1/session-index/project-dirs.ts` to `src/paths.ts`, so the shared module can use them. - The 40 v2 and 2 AIR scenario golden files gain the capability in `initialize`, and the origin/main comparison allows it, next to `systemPrompt` and `auth.status`. - The README lists `session/status` in the v2 surface.	2026-11-10 18:11:39 +00:00
Ben Brandt	99cc1f3245	fix: report Claude Code's API error message as a notice in v2 (#1582 ) ## Problem When an API request fails, Claude Code writes its own assistant message into the conversation, e.g. "API Error: Connection lost mid-response. The response above may be incomplete." The SDK marks it with `error` on a `<synthetic>` message. The v2 agent forwarded that message as an ordinary `agent_message_chunk`, so clients showed it as Claude's own prose. Right after a thinking block it reads as if Claude wrote it, and a client cannot tell it apart without matching the string. ## Change The v2 agent no longer sends that message as Claude's text: - When the turn fails, the idle's `error` already carries the failure, so nothing else is sent. - Otherwise the text goes out as a `notice` with severity `error`, once, before the turn's idle. A result that repeats the same text is not shown again. Claude Code's sign-in message is handled as before. ## Not changed - v1 keeps its current behaviour: clients with the session-failure extension already drop this text, and others keep the transcript line. - `session/load` replay still shows these messages as text. `getSessionMessages` strips the `error` marker, so replay cannot identify them without matching prose. ## Testing - New v2 cases: a notice when the turn ends normally, one notice when the result repeats the text, and no notice when the idle fails. They fail without the change. - `npm run check` and `npm run test:run` pass.	2026-11-10 18:51:11 +01:00
Mark Tkachenko	bce309f482	refactor: move the v1 client connection out of acp-agent.ts (#1576 ) Moves `ClientConnection` and `ChangedMetaClient` verbatim from `src/v1/acp-agent.ts` into `src/v1/client-connection.ts`. No behaviour change. - Both classes gain `export`; nothing else in them changes. - `client-connection.ts` imports nothing from `acp-agent.ts`. - The `acp-client.ts` comment that names where `ClientConnection` lives now points to the new file. - Emitted JS differs from `main` only in `dist/v1/acp-agent.js` (the import and the two classes) plus the new `dist/v1/client-connection.js`. Review with `git diff --color-moved` to see the move.	2026-11-10 17:54:17 +01:00
acp-release-bot[bot]	6b86f7b46a	chore(main): release 0.104.1 (#1575 ) 🤖 I have created a release beep boop --- ## [0.104.1](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.104.0...v0.104.1) (2026-11-10) ### Bug Fixes * carry the auth detail in the ACP account label ([#1573](https://github.com/agentclientprotocol/claude-agent-acp/issues/1573)) ([`3d6eb7b`](`3d6eb7b5b6`)) * distinguish Ultra from Max in auth status ([#1574](https://github.com/agentclientprotocol/claude-agent-acp/issues/1574)) ([`7d95d30`](`7d95d30ec3`)) * update to @anthropic-ai/claude-agent-sdk 0.3.322 ([#1577](https://github.com/agentclientprotocol/claude-agent-acp/issues/1577)) ([`b89e449`](`b89e4497da`)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). Co-authored-by: acp-release-bot[bot] <246668977+acp-release-bot[bot]@users.noreply.github.com>	2026-11-10 14:48:59 +01:00
Ben Brandt	b89e4497da	fix: update to @anthropic-ai/claude-agent-sdk 0.3.322 (#1577 ) - Bumps `@anthropic-ai/claude-agent-sdk` 0.3.321 → 0.3.322. - Runs `npm update` for in-range lockfile bumps: `rolldown` 1.2.16 → 1.2.18, `vite` 6.2.16 → 6.2.17, `express-rate-limit` 8.3.6 → 8.3.7, `jose` 8.7.3 → 8.7.4. TypeScript stays at 6.0.3: 7.0.2 is out, but the latest `@typescript-eslint/parser` (8.72.2) requires `typescript <6.1.0`. `npm run build`, `npm run check` and `npm run test:run` pass locally. One test failed once after `npm update` (not captured); four later full runs all passed, so it looks flaky.	2026-11-10 14:41:44 +01:00
Ben Brandt	7d95d30ec3	fix: distinguish Ultra from Max in auth status (#1574 ) ## Summary - Read the optional `planTier` field from the existing `claude auth status --json` probe. Display Max subscriptions with `max_20x` as Claude Ultra, while `max_5x` remains Claude Max. - Fall back to the existing subscription label when the tier is missing, unknown, or malformed. Preserve auth-source precedence and raw plan metadata. - Keep the CLI-derived label when a session SDK account read reports the same identity and plan without a tier. A fresh CLI probe can still replace the label, including when its tier is absent. - Cover ACP v1 and v2 notifications and responses, and document the display behavior. The SDK AccountInfo omits the plan tier, but the bundled CLI already emits it in auth-status JSON. This uses that CLI-only field as best-effort display metadata, without additional probes, direct credential-file reads, or entitlement checks. ## Validation - `npm run build` - `npm run check` - `npm run test:run` — 4,002 passed, 33 skipped - Targeted v1 auth-status and v2 protocol tests — 341 passed - Local bundled CLI smoke check: `subscriptionType: "max"`, `planTier: "max_20x"` maps to `Claude Ultra` - Live model integration tests were not run.	2026-11-10 13:25:20 +00:00
Ben Brandt	3d6eb7b5b6	fix: carry the auth detail in the ACP account label (#1573 ) ## Summary The ACP `auth/status` account (`label`, `active`, `name`, `email`, `organization`) has no field for the identity's `detail`: an API key's source, a gateway's host, or "OAuth token". It was only in `_meta.claudeCode.detail`, so a client that shows the standard fields could not tell which API key or gateway is in use. `toAcpAuthStatus` now appends the detail to the account's `label` in parentheses: - `Anthropic API key (ANTHROPIC_API_KEY)` - `Custom model gateway (gw.example.com)` - `Claude subscription (OAuth token)` An identity without a detail keeps its label as it was (`Claude Max`). ## Unchanged - `_meta.claudeCode` still carries `kind`, `detail` and `plan` on their own. - The `_auth/status_update` extension payload (`label` and `detail` as separate fields). - The mapping is shared, so v1 and v2 report the same label in `auth/status` and `auth/status_update`. ## Testing - `src/tests/v1/auth-status.test.ts` expectations updated for the API key and gateway labels. - `npm run test:run`, `npm run check` and `npm run build` pass.	2026-11-10 14:21:33 +01:00