chore(main): release 0.64.1 (#940 )

🤖 I have created a release *beep* *boop* --- ## [0.64.1](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.64.0...v0.64.1) (2026-08-02) ### Bug Fixes * release 0.65.0 ([#939](https://github.com/agentclientprotocol/claude-agent-acp/issues/939)) ([0936ec2](0936ec281e)) --- 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>
fix: release 0.65.0 (#939 )
2026-11-04 16:31:56 +00:00 · 2026-08-02 14:07:49 +02:00 · 2026-08-02 14:03:22 +02:00 · 2026-08-02 07:53:09 +00:00 · 2026-07-30 16:21:11 +00:00 · 2026-07-30 17:36:36 +02:00
18 changed files with 3212 additions and 347 deletions
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,10 +21,10 @@ jobs:
    timeout-minutes: 5

    steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1

      - name: Use Node.js
-        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e
+        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020
        with:
          node-version: "lts/*"
          cache: "npm"
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -44,9 +44,9 @@ jobs:
      contents: read
      id-token: write
    steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
      # Setup .npmrc file to publish to npm
-      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020
        with:
          node-version: "lts/*"
          registry-url: "https://registry.npmjs.org"
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ dist
 .DS_Store
 .claude/*.local.*
 CLAUDE.local.md
+.idea/
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.60.0"
+  ".": "0.64.1"
 }
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,58 @@
 # Changelog

+## [0.64.1](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.64.0...v0.64.1) (2026-08-02)
+
+
+### Bug Fixes
+
+* release 0.65.0 ([#939](https://github.com/agentclientprotocol/claude-agent-acp/issues/939)) ([0936ec2](https://github.com/agentclientprotocol/claude-agent-acp/commit/0936ec281ec730714c605e3da732069ff47d8969))
+
+## [0.64.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.63.0...v0.64.0) (2026-07-30)
+
+
+### Features
+
+* **deps:** Bump actions/checkout from 7.0.0 to 7.0.1 ([#925](https://github.com/agentclientprotocol/claude-agent-acp/issues/925)) ([8e099e8](https://github.com/agentclientprotocol/claude-agent-acp/commit/8e099e844254c3e91508c79a02e3e7dc2239fcbb))
+* **deps:** Bump the minor group with 7 updates ([#928](https://github.com/agentclientprotocol/claude-agent-acp/issues/928)) ([3f60921](https://github.com/agentclientprotocol/claude-agent-acp/commit/3f609219592e63b947539f79c696b3cedb421060))
+
+
+### Bug Fixes
+
+* **steering:** add opt-in host-owned fallback ([#919](https://github.com/agentclientprotocol/claude-agent-acp/issues/919)) ([43af4ec](https://github.com/agentclientprotocol/claude-agent-acp/commit/43af4ec29ea5396c2614813af05967bfb0b1bac8)), closes [#903](https://github.com/agentclientprotocol/claude-agent-acp/issues/903)
+
+## [0.63.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.62.0...v0.63.0) (2026-07-27)
+
+
+### Features
+
+* Update to claude agent sdk v0.3.220 ([#921](https://github.com/agentclientprotocol/claude-agent-acp/issues/921)) ([4c7b897](https://github.com/agentclientprotocol/claude-agent-acp/commit/4c7b89718306229254879e5045a183233b5ed073))
+
+
+### Bug Fixes
+
+* Only resolve a denied tool call the client was told about ([#923](https://github.com/agentclientprotocol/claude-agent-acp/issues/923)) ([8f67b6a](https://github.com/agentclientprotocol/claude-agent-acp/commit/8f67b6a92bec24ae43b3dfbd087fe35df0531857)), closes [#918](https://github.com/agentclientprotocol/claude-agent-acp/issues/918)
+* Report tool_progress heartbeats against the tool call they describe ([#916](https://github.com/agentclientprotocol/claude-agent-acp/issues/916)) ([5559ba8](https://github.com/agentclientprotocol/claude-agent-acp/commit/5559ba890ca614cdaa189500aba65d81cc4cd51a))
+* **tools:** key Bash terminal metas off the announced tool_use id ([#917](https://github.com/agentclientprotocol/claude-agent-acp/issues/917)) ([d060414](https://github.com/agentclientprotocol/claude-agent-acp/commit/d0604140f907adbf9747f26a070690926e1de82d))
+
+## [0.62.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.61.0...v0.62.0) (2026-07-24)
+
+
+### Features
+
+* **deps:** Bump @hono/node-server from 1.19.14 to 1.19.15 ([#908](https://github.com/agentclientprotocol/claude-agent-acp/issues/908)) ([5193604](https://github.com/agentclientprotocol/claude-agent-acp/commit/51936049e175274de8e0fd90bc1be2af988c3ca6))
+* **deps:** Bump media-typer from 1.1.0 to 1.1.1 ([#909](https://github.com/agentclientprotocol/claude-agent-acp/issues/909)) ([5d35001](https://github.com/agentclientprotocol/claude-agent-acp/commit/5d35001563ffd702a29c3bac3b7ca134e40c77f8))
+* **deps:** Bump the minor group with 2 updates ([#900](https://github.com/agentclientprotocol/claude-agent-acp/issues/900)) ([809d41c](https://github.com/agentclientprotocol/claude-agent-acp/commit/809d41c6b7c9e7ba3cb5b206d00793a70edba64a))
+* **deps:** Bump the minor group with 2 updates ([#907](https://github.com/agentclientprotocol/claude-agent-acp/issues/907)) ([14d0627](https://github.com/agentclientprotocol/claude-agent-acp/commit/14d06273c01ad4ae944912e36700f6b5599c4c4d))
+* Update to claude-agent-sdk 0.3.218 ([#904](https://github.com/agentclientprotocol/claude-agent-acp/issues/904)) ([8cbaf97](https://github.com/agentclientprotocol/claude-agent-acp/commit/8cbaf97254576089a3b5ee6ae222fb763003c01d))
+
+## [0.61.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.60.0...v0.61.0) (2026-07-22)
+
+
+### Features
+
+* **deps:** Bump actions/setup-node from 6.4.0 to 7.0.0 ([#897](https://github.com/agentclientprotocol/claude-agent-acp/issues/897)) ([d9bd36d](https://github.com/agentclientprotocol/claude-agent-acp/commit/d9bd36d8b06764d63656d0387ad9430ec9fcb27d))
+* **deps:** Update to @anthropic-ai/claude-agent-sdk 0.3.217 ([#899](https://github.com/agentclientprotocol/claude-agent-acp/issues/899)) ([edf3af0](https://github.com/agentclientprotocol/claude-agent-acp/commit/edf3af043b6d00e5caca2cc81a2285c477c8b2ab))
+
 ## [0.60.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.59.0...v0.60.0) (2026-07-20)


--- a/README.md
+++ b/README.md
@@ -12,12 +12,24 @@ This tool implements an ACP agent by using the official [Claude Agent SDK](https
 - Following
 - Edit review
 - TODO lists
+- Nested subagent transcripts
 - Interactive (and background) terminals
 - Custom [Slash commands](https://docs.anthropic.com/en/docs/claude-code/slash-commands)
 - Client MCP servers

 Learn more about the [Agent Client Protocol](https://agentclientprotocol.com/).

+### Nested subagent transcripts
+
+ACP 1.2 has no standard subagent tool kind or nested-message relationship. Clients that can render
+nested transcripts can opt in with `clientCapabilities._meta["subagent-transcript"] = true`.
+The agent then forwards subagent text, thinking, and tool calls, relating nested updates to the
+launching Agent/Task call through `_meta.claudeCode.parentToolUseId`. Agent/Task calls are marked
+with `_meta.claudeCode.subagent = true`.
+
+Clients that do not advertise the capability retain the legacy flattened behavior. In both modes,
+the normal Agent/Task tool result is preserved as the protocol-compatible fallback.
+
 ## Contribution Policy

 This project does not require a Contributor License Agreement (CLA). Instead, contributions are accepted under the following terms:
--- a/examples/steering.ts
+++ b/examples/steering.ts
@@ -0,0 +1,221 @@
+/**
+ * Example: mid-turn steering over ACP with the `_session/steering` extension.
+ *
+ * "Steering" lets a client deliver a follow-up message to a turn that is still
+ * running, instead of waiting for it to finish and sending a fresh
+ * `session/prompt`. This is what powers "the user typed something while the
+ * agent was still working" — the new message joins the in-flight turn so the
+ * agent can adapt immediately (it shines in multi-step / tool-using turns,
+ * where the message slots in between tool calls).
+ *
+ * The wire protocol has three moving parts:
+ *
+ *   1. The agent advertises support in its `initialize` response, at the
+ *      top-level `_meta.steering` (a sibling of `agentCapabilities`).
+ *   2. The client calls the `_session/steering` request with `{ sessionId,
+ *      prompt }` while a turn is running.
+ *   3. The agent replies with an `outcome`:
+ *        - "injected"       the message joined the running turn;
+ *        - "startedNewTurn" the turn had already finished and the legacy
+ *                           detached fallback was used;
+ *        - "promptRequired" the turn had already finished, but this request
+ *                           explicitly opted into Host-owned prompt delivery.
+ *
+ * This example launches the agent as a subprocess, starts a deliberately
+ * long-running prompt, and — as soon as the agent begins streaming — injects a
+ * steering message and prints the outcome. All agent output is streamed to
+ * stdout so you can watch the turn change course.
+ *
+ * Run (build the agent first so `dist/index.js` exists):
+ *
+ *   npm run build
+ *   node examples/steering.ts
+ *
+ * (Node < 22.18 needs `node --experimental-strip-types examples/steering.ts`.)
+ *
+ * Override the prompts with the PROMPT / STEER env vars. Requires the agent to
+ * be authenticated, since it talks to the real model.
+ */
+import { spawn } from "node:child_process";
+import { Readable, Writable } from "node:stream";
+import { fileURLToPath } from "node:url";
+import path from "node:path";
+import {
+  client as acpClient,
+  methods,
+  ndJsonStream,
+  type PromptRequest,
+  type PromptResponse,
+} from "@agentclientprotocol/sdk";
+
+/** The steering extension method, per the ACP steering wire protocol. */
+const STEERING_METHOD = "_session/steering";
+
+/** Params for a `_session/steering` request — the same shape as the relevant
+ *  subset of a `session/prompt`. */
+type SteeringRequest = {
+  sessionId: string;
+  prompt: Array<{ type: "text"; text: string }>;
+  _meta?: { steering?: { idleBehavior?: "promptRequired" } };
+};
+
+/** Result of a `_session/steering` request. `injected` means the message joined
+ *  the running turn; `promptRequired` means the turn had already settled, so the
+ *  message was NOT consumed and must be (re)sent through a normal
+ *  `session/prompt`. Both are successes. */
+type SteeringResponse =
+  | { outcome: "injected" }
+  | { outcome: "startedNewTurn" }
+  | { outcome: "promptRequired"; reason: "noRunningTurn" };
+
+/** The existing steering capability advertised at the top-level `_meta.steering`
+ *  of the `initialize` result. The idle behavior is selected per request. */
+type SteeringCapability = {
+  supported?: boolean;
+};
+
+// The built agent entry. Run `npm run build` first so this exists.
+const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+const AGENT_ENTRY = process.env.AGENT_ENTRY ?? path.join(repoRoot, "dist", "index.js");
+const CWD = process.env.CWD ?? process.cwd();
+
+// A deliberately long-running first prompt, and the follow-up injected while it
+// is still streaming. Override either via env vars to experiment.
+const PROMPT =
+  process.env.PROMPT ??
+  "Count slowly from 1 to 30, one number per line, with a short sentence of " +
+    "commentary after each. Do not stop early.";
+const STEER =
+  process.env.STEER ?? "Actually stop counting and instead reply with exactly one line: STEERED-OK";
+
+function log(msg: string) {
+  process.stderr.write(`\x1b[2m[client]\x1b[0m ${msg}\n`);
+}
+
+const delay = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
+
+async function main() {
+  // An ACP client launches the agent as a subprocess and speaks JSON-RPC over
+  // its stdin/stdout. stderr is inherited so the agent's own logs stay visible.
+  const child = spawn(process.execPath, [AGENT_ENTRY], {
+    stdio: ["pipe", "pipe", "inherit"],
+    env: process.env,
+  });
+  child.on("error", (err) => {
+    log(`failed to spawn agent (${AGENT_ENTRY}): ${err}`);
+  });
+
+  try {
+    const stream = ndJsonStream(
+      Writable.toWeb(child.stdin!) as WritableStream<Uint8Array>,
+      Readable.toWeb(child.stdout!) as unknown as ReadableStream<Uint8Array>,
+    );
+
+    // Resolves the first time the agent streams assistant text — our signal that
+    // the turn is genuinely underway and therefore steerable.
+    let signalFirstOutput = () => {};
+    const firstOutput = new Promise<void>((resolve) => (signalFirstOutput = resolve));
+
+    const connection = acpClient({ name: "steering-example" })
+      .onNotification(methods.client.session.update, (ctx) => {
+        const update = ctx.params.update;
+        if (update.sessionUpdate === "agent_message_chunk" && update.content.type === "text") {
+          process.stdout.write(update.content.text);
+          signalFirstOutput();
+        }
+      })
+      // Auto-approve permission prompts so the turn is never blocked on us.
+      .onRequest(methods.client.session.requestPermission, (ctx) => {
+        const options = ctx.params.options;
+        const option = options.find((o) => o.kind === "allow_once") ?? options[0];
+        return { outcome: { outcome: "selected", optionId: option.optionId } };
+      })
+      // Minimal file-system stubs; the example prompts don't touch files.
+      .onRequest(methods.client.fs.readTextFile, () => ({ content: "" }))
+      .onRequest(methods.client.fs.writeTextFile, () => ({}))
+      .connect(stream);
+
+    try {
+      const agent = connection.agent;
+
+      // 1. Initialize and confirm the agent advertises steering. Per the wire
+      //    protocol the capability lives at the TOP-LEVEL `_meta` of the initialize
+      //    result — a sibling of `agentCapabilities`, not nested inside it.
+      const init = await agent.request(methods.agent.initialize, {
+        protocolVersion: 1,
+        clientCapabilities: { fs: { readTextFile: true, writeTextFile: true } },
+      });
+      const steering = (init._meta as { steering?: SteeringCapability } | null | undefined)
+        ?.steering;
+      if (steering?.supported !== true) {
+        throw new Error("agent does not advertise steering support");
+      }
+      log("agent advertises steering support");
+
+      // 2. Open a session.
+      const { sessionId } = await agent.request(methods.agent.session.new, {
+        cwd: CWD,
+        mcpServers: [],
+      });
+      log(`session: ${sessionId}`);
+
+      // 3. Start a long turn, but DON'T await it yet — we need it in flight so we
+      //    can steer it. Its output streams through the notification handler above.
+      log(`prompt: ${PROMPT}`);
+      process.stdout.write("\n----- agent output -----\n");
+      const turn = agent.request(methods.agent.session.prompt, {
+        sessionId,
+        prompt: [{ type: "text", text: PROMPT }],
+      });
+
+      // 4. Once the turn is producing output, inject the follow-up. Wait for the
+      //    first streamed chunk (with a fallback) plus a beat, so the steer clearly
+      //    lands mid-turn.
+      await Promise.race([firstOutput, delay(5000)]);
+      await delay(1000);
+
+      process.stdout.write("\n");
+      log(`steer: ${STEER}`);
+      const steerRequest: SteeringRequest = {
+        sessionId,
+        prompt: [{ type: "text", text: STEER }],
+        // Opt into the host-owned idle fallback. Without this request metadata,
+        // the Adapter preserves its legacy `startedNewTurn` behavior.
+        _meta: { steering: { idleBehavior: "promptRequired" } },
+      };
+      const result = await agent.request<SteeringResponse>(STEERING_METHOD, steerRequest);
+      log(`steer outcome: ${result.outcome}`);
+
+      if (result.outcome === "promptRequired") {
+        // The target turn already settled, so steering did not consume the message.
+        // Start a normal session/prompt on the same session to deliver it — that
+        // request owns the continuation's updates and terminal response.
+        log(`steer fallback: ${result.reason}; starting a normal session/prompt`);
+        const continuationRequest: PromptRequest = {
+          sessionId: steerRequest.sessionId,
+          prompt: steerRequest.prompt,
+        };
+        const continuation = await agent.request<PromptResponse, PromptRequest>(
+          methods.agent.session.prompt,
+          continuationRequest,
+        );
+        log(`continuation stopReason: ${continuation.stopReason}`);
+      }
+
+      // 5. Await the original turn. With outcome "injected" the steer already
+      //    reshaped the output above; the promptRequired branch owns its own turn.
+      const response = await turn;
+      log(`original turn stopReason: ${response.stopReason}`);
+      process.stdout.write("\n----- end of agent output -----\n");
+    } finally {
+      connection.close();
+    }
+  } finally {
+    child.kill();
+  }
+}
+
+main().catch((err) => {
+  log(`fatal: ${err?.stack ?? err}`);
+  process.exitCode = 1;
+});
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,32 +1,32 @@
 {
  "name": "@agentclientprotocol/claude-agent-acp",
-  "version": "0.60.0",
+  "version": "0.64.1",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "@agentclientprotocol/claude-agent-acp",
-      "version": "0.60.0",
+      "version": "0.64.1",
      "license": "Apache-2.0",
      "dependencies": {
-        "@agentclientprotocol/sdk": "1.2.1",
-        "@anthropic-ai/claude-agent-sdk": "0.3.215",
+        "@agentclientprotocol/sdk": "1.3.0",
+        "@anthropic-ai/claude-agent-sdk": "0.3.220",
        "zod": "^3.25.0 || ^4.0.0"
      },
      "bin": {
        "claude-agent-acp": "dist/index.js"
      },
      "devDependencies": {
-        "@anthropic-ai/sdk": "0.112.3",
+        "@anthropic-ai/sdk": "0.115.0",
        "@eslint/js": "10.0.1",
        "@tsconfig/node22": "22.0.5",
-        "@types/node": "26.1.1",
-        "@typescript-eslint/eslint-plugin": "8.64.0",
-        "@typescript-eslint/parser": "8.64.0",
-        "eslint": "10.7.0",
+        "@types/node": "26.1.2",
+        "@typescript-eslint/eslint-plugin": "8.65.0",
+        "@typescript-eslint/parser": "8.65.0",
+        "eslint": "10.8.0",
        "eslint-config-prettier": "10.1.8",
-        "globals": "17.7.0",
-        "prettier": "3.9.5",
+        "globals": "17.8.0",
+        "prettier": "3.9.6",
        "ts-node": "10.9.2",
        "typescript": "6.0.3",
        "vitest": "4.1.10"
@@ -36,31 +36,31 @@
      }
    },
    "node_modules/@agentclientprotocol/sdk": {
-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/@agentclientprotocol/sdk/-/sdk-1.2.1.tgz",
-      "integrity": "sha512-jwYUdOQR7tc+Zfch53VL4JJyUNK/46q03uUTYb+PjECsmnNl94XFXOfYLJ8RBpMNidXd1rpOAVgb0vqD98xImA==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/@agentclientprotocol/sdk/-/sdk-1.3.0.tgz",
+      "integrity": "sha512-i3h/efaeuMUFAO1HSfo97QZQnnvMd7wWBYtBsdL6UMZg3a78sk3Ffya5Xu7C7tYsXomXoDXJBAzQF2PcFKAhIQ==",
      "license": "Apache-2.0",
      "peerDependencies": {
        "zod": "^3.25.0 || ^4.0.0"
      }
    },
    "node_modules/@anthropic-ai/claude-agent-sdk": {
-      "version": "0.3.215",
-      "resolved": "https://registry.npmjs.org/@anthropic-ai/claude-agent-sdk/-/claude-agent-sdk-0.3.215.tgz",
-      "integrity": "sha512-fBktJCwfu8ZeOSnnSLcWVkIHyp/pjouJsGVGtRnQ0HkcRuOReIbRcB/6n2O5dYV331Ok+MfdGHiPaTORj7pCtQ==",
+      "version": "0.3.220",
+      "resolved": "https://registry.npmjs.org/@anthropic-ai/claude-agent-sdk/-/claude-agent-sdk-0.3.220.tgz",
+      "integrity": "sha512-glc7SdwPkOkLw8oxwLo9PKTdLJGqW/PIR4urWXFoRtX9YllwozsEVc5Tc1+EvLSkfrsxPJqQWqOgpjUOQXf1oA==",
      "license": "SEE LICENSE IN README.md",
      "engines": {
        "node": ">=18.0.0"
      },
      "optionalDependencies": {
-        "@anthropic-ai/claude-agent-sdk-darwin-arm64": "0.3.215",
-        "@anthropic-ai/claude-agent-sdk-darwin-x64": "0.3.215",
-        "@anthropic-ai/claude-agent-sdk-linux-arm64": "0.3.215",
-        "@anthropic-ai/claude-agent-sdk-linux-arm64-musl": "0.3.215",
-        "@anthropic-ai/claude-agent-sdk-linux-x64": "0.3.215",
-        "@anthropic-ai/claude-agent-sdk-linux-x64-musl": "0.3.215",
-        "@anthropic-ai/claude-agent-sdk-win32-arm64": "0.3.215",
-        "@anthropic-ai/claude-agent-sdk-win32-x64": "0.3.215"
+        "@anthropic-ai/claude-agent-sdk-darwin-arm64": "0.3.220",
+        "@anthropic-ai/claude-agent-sdk-darwin-x64": "0.3.220",
+        "@anthropic-ai/claude-agent-sdk-linux-arm64": "0.3.220",
+        "@anthropic-ai/claude-agent-sdk-linux-arm64-musl": "0.3.220",
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-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.20.tgz",
-      "integrity": "sha512-lW616l85ucIQL+FocMmL7pQFPqBmwejrCMg+iPxyImlrANNJG9NHq/RkyCZopDhd8C3LA03PHRJDjkbGu8vvug==",
+      "version": "8.5.24",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.24.tgz",
+      "integrity": "sha512-8RyVklq0owXUTa4xlpzu4l9AaVKIdQvAcOHZWaMh98HgySsUtxRVf/chRe3dsSLqb6i40BzGRzEUddRaI+9TSw==",
      "dev": true,
      "funding": [
        {
@@ -3228,9 +3272,9 @@
      }
    },
    "node_modules/prettier": {
-      "version": "3.9.5",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.9.5.tgz",
-      "integrity": "sha512-/FVl766LpUfB5vXgCYOYa0MeV/441Ia99AeICQIQFTY/Nw0roZwULcXpku5i1/m5kt/baz+s4Zogspd839HSMg==",
+      "version": "3.9.6",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.9.6.tgz",
+      "integrity": "sha512-OpN0zzVdiaiAhxpuuj5efpIS4sY9j7bY6uR5mnj5yPzGkdkjNKSJeUThPb60Jw29QuAZgA4o+/iB49kFiaBX6g==",
      "dev": true,
      "license": "MIT",
      "bin": {
@@ -3632,9 +3676,9 @@
      }
    },
    "node_modules/tinyrainbow": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.1.0.tgz",
-      "integrity": "sha512-Bf+ILmBgretUrdJxzXM0SgXLZ3XfiaUuOj/IKQHuTXip+05Xn+uyEYdVg0kYDipTBcLrCVyUzAPz7QmArb0mmw==",
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.1.1.tgz",
+      "integrity": "sha512-yau8yJdTt989Mm0Bd/236QnzEiPf2xLLTqUZRUJOo/3CB078LSwzei343DgtJVmfJKJE3TMINY1u42SQsP6mXw==",
      "dev": true,
      "license": "MIT",
      "engines": {
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
  "publishConfig": {
    "access": "public"
  },
-  "version": "0.60.0",
+  "version": "0.64.1",
  "description": "An ACP-compatible coding agent powered by the Claude Agent SDK (TypeScript)",
  "main": "dist/lib.js",
  "types": "dist/lib.d.ts",
@@ -63,21 +63,21 @@
    "node": ">=22"
  },
  "dependencies": {
-    "@agentclientprotocol/sdk": "1.2.1",
-    "@anthropic-ai/claude-agent-sdk": "0.3.215",
+    "@agentclientprotocol/sdk": "1.3.0",
+    "@anthropic-ai/claude-agent-sdk": "0.3.220",
    "zod": "^3.25.0 || ^4.0.0"
  },
  "devDependencies": {
-    "@anthropic-ai/sdk": "0.112.3",
+    "@anthropic-ai/sdk": "0.115.0",
    "@eslint/js": "10.0.1",
    "@tsconfig/node22": "22.0.5",
-    "@types/node": "26.1.1",
-    "@typescript-eslint/eslint-plugin": "8.64.0",
-    "@typescript-eslint/parser": "8.64.0",
-    "eslint": "10.7.0",
+    "@types/node": "26.1.2",
+    "@typescript-eslint/eslint-plugin": "8.65.0",
+    "@typescript-eslint/parser": "8.65.0",
+    "eslint": "10.8.0",
    "eslint-config-prettier": "10.1.8",
-    "globals": "17.7.0",
-    "prettier": "3.9.5",
+    "globals": "17.8.0",
+    "prettier": "3.9.6",
    "ts-node": "10.9.2",
    "typescript": "6.0.3",
    "vitest": "4.1.10"
--- a/src/acp-agent.ts
+++ b/src/acp-agent.ts
--- a/src/elicitation.ts
+++ b/src/elicitation.ts
@@ -148,6 +148,14 @@ function questionCustomFieldKey(index: number): string {
 */
 const OPTION_META_KEY = "_claude/askUserQuestionOption";

+/**
+ * Shared `_meta` key for marking a per-question free-text field as the custom
+ * answer companion for a select question. This intentionally has no
+ * agent-specific namespace so ACP clients can recognize the same marker across
+ * Codex, Claude, and other AskUserQuestion bridges.
+ */
+const CUSTOM_ANSWER_META_KEY = "_askUserQuestionCustomAnswer";
+
 /**
 * Render the AskUserQuestion tool's questions as an ACP form elicitation.
 *
@@ -204,6 +212,12 @@ export function askUserQuestionsToCreateRequest(
      type: "string",
      title: "Other",
      description: "Type your own answer instead of choosing an option above (optional).",
+      _meta: {
+        [CUSTOM_ANSWER_META_KEY]: {
+          questionId: questionFieldKey(index),
+          isCustomAnswer: true,
+        },
+      },
    };
  });

--- a/src/tests/acp-agent.test.ts
+++ b/src/tests/acp-agent.test.ts
--- a/src/tests/create-session-options.test.ts
+++ b/src/tests/create-session-options.test.ts
@@ -263,6 +263,38 @@ describe("createSession options merging", () => {
    expect(capturedOptions!.tools).toEqual([]);
  });

+  describe("subagent transcript forwarding", () => {
+    it("keeps the legacy default when neither the client nor caller opts in", async () => {
+      await agent.newSession({ cwd: process.cwd(), mcpServers: [] });
+
+      expect(capturedOptions!.forwardSubagentText).toBe(false);
+    });
+
+    it("preserves the pre-existing caller-provided SDK option", async () => {
+      await agent.newSession({
+        cwd: process.cwd(),
+        mcpServers: [],
+        _meta: { claudeCode: { options: { forwardSubagentText: true } } },
+      });
+
+      expect(capturedOptions!.forwardSubagentText).toBe(true);
+    });
+
+    it("enables SDK forwarding when the ACP client advertises support", async () => {
+      await agent.initialize({
+        protocolVersion: 1,
+        clientCapabilities: { _meta: { "subagent-transcript": true } },
+      });
+      await agent.newSession({
+        cwd: process.cwd(),
+        mcpServers: [],
+        _meta: { claudeCode: { options: { forwardSubagentText: false } } },
+      });
+
+      expect(capturedOptions!.forwardSubagentText).toBe(true);
+    });
+  });
+
  describe("systemPrompt via _meta", () => {
    it("defaults to the claude_code preset when not provided", async () => {
      await agent.newSession({ cwd: process.cwd(), mcpServers: [] });
--- a/src/tests/elicitation.test.ts
+++ b/src/tests/elicitation.test.ts
@@ -264,10 +264,22 @@ describe("askUserQuestionsToCreateRequest", () => {
    expect(schema.properties?.["question_0_custom"]).toMatchObject({
      type: "string",
      title: "Other",
+      _meta: {
+        _askUserQuestionCustomAnswer: {
+          questionId: "question_0",
+          isCustomAnswer: true,
+        },
+      },
    });
    expect(schema.properties?.["question_1_custom"]).toMatchObject({
      type: "string",
      title: "Other",
+      _meta: {
+        _askUserQuestionCustomAnswer: {
+          questionId: "question_1",
+          isCustomAnswer: true,
+        },
+      },
    });
  });

--- a/src/tests/fast-mode-config.test.ts
+++ b/src/tests/fast-mode-config.test.ts
@@ -1,11 +1,12 @@
 import { describe, it, expect, vi } from "vitest";
 import type { ClientCapabilities, SessionNotification } from "@agentclientprotocol/sdk";
-import type { ModelInfo } from "@anthropic-ai/claude-agent-sdk";
+import type { FastModeDisabledReason, ModelInfo } from "@anthropic-ai/claude-agent-sdk";
 import {
  buildConfigOptions,
  clientSupportsBooleanConfigOptions,
  createFastModeConfigOption,
  fastModeStateEnabled,
+  normalizeFastModeDisabledReason,
  resolveFastModeEnabled,
  FAST_MODE_CONFIG_ID,
  FAST_MODE_ON,
@@ -42,6 +43,28 @@ describe("createFastModeConfigOption", () => {
    });
  });

+  it("explains a blocking disabled reason while the toggle reads off", () => {
+    const option = createFastModeConfigOption(false, true, "free");
+    expect(option.description).toBe(
+      "Faster responses on supported models — not available on the free plan",
+    );
+  });
+
+  it("ignores routine and on-state reasons", () => {
+    // Every SDK session starts at `sdk_opt_in_required` — the toggle IS the
+    // opt-in, so it must not read as a blocker.
+    expect(createFastModeConfigOption(false, true, "sdk_opt_in_required").description).toBe(
+      "Faster responses on supported models",
+    );
+    expect(createFastModeConfigOption(false, true, "preference").description).toBe(
+      "Faster responses on supported models",
+    );
+    // A reason riding an `on` state isn't blocking anything right now.
+    expect(createFastModeConfigOption(true, true, "free").description).toBe(
+      "Faster responses on supported models",
+    );
+  });
+
  it("falls back to an on/off select when the client did not opt in", () => {
    const option = createFastModeConfigOption(false, false);
    expect(option).toMatchObject({
@@ -104,6 +127,28 @@ describe("fastModeStateEnabled", () => {
  });
 });

+describe("normalizeFastModeDisabledReason", () => {
+  it("retains only reasons we have an explanation for", () => {
+    expect(normalizeFastModeDisabledReason("free")).toBe("free");
+    expect(normalizeFastModeDisabledReason("extra_usage_disabled")).toBe("extra_usage_disabled");
+    expect(normalizeFastModeDisabledReason("model_not_allowed")).toBe("model_not_allowed");
+    expect(normalizeFastModeDisabledReason("not_first_party")).toBe("not_first_party");
+    expect(normalizeFastModeDisabledReason("disabled_by_env")).toBe("disabled_by_env");
+    expect(normalizeFastModeDisabledReason("network_error")).toBe("network_error");
+  });
+
+  it("drops routine states and unknown values", () => {
+    expect(normalizeFastModeDisabledReason("sdk_opt_in_required")).toBeUndefined();
+    expect(normalizeFastModeDisabledReason("preference")).toBeUndefined();
+    expect(normalizeFastModeDisabledReason("pending")).toBeUndefined();
+    expect(normalizeFastModeDisabledReason("unknown")).toBeUndefined();
+    expect(normalizeFastModeDisabledReason(undefined)).toBeUndefined();
+    expect(
+      normalizeFastModeDisabledReason("some_future_reason" as FastModeDisabledReason),
+    ).toBeUndefined();
+  });
+});
+
 describe("buildConfigOptions Fast mode", () => {
  it("omits the Fast mode option when the model does not support it", () => {
    const options = buildConfigOptions(MODES, MODELS, MODEL_INFOS, undefined, [], "default", {
@@ -249,6 +294,7 @@ describe("syncFastModeState (SDK-driven state changes)", () => {
    const session = {
      query: {},
      fastModeEnabled: opts.fastModeEnabled,
+      fastModeDisabledReason: undefined as FastModeDisabledReason | undefined,
      configOptions: opts.withOption
        ? [createFastModeConfigOption(opts.fastModeEnabled, true)]
        : [],
@@ -261,6 +307,7 @@ describe("syncFastModeState (SDK-driven state changes)", () => {
          sessionId: string,
          session: unknown,
          state: string | undefined,
+          reason?: FastModeDisabledReason,
        ) => Promise<void>;
      }
    ).syncFastModeState.bind(agent);
@@ -319,10 +366,65 @@ describe("syncFastModeState (SDK-driven state changes)", () => {

    await sync(SESSION_ID, session, undefined);
    await sync(SESSION_ID, session, "off");
+    // A routine reason normalizes away, so it's still "unchanged" — an
+    // `sdk_opt_in_required` on every turn's result must not churn the option.
+    await sync(SESSION_ID, session, "off", "sdk_opt_in_required");

    expect(sessionUpdates).toHaveLength(0);
  });

+  it("explains a blocking reason once when the SDK refuses a toggle the user turned on", async () => {
+    const { sync, session, sessionUpdates } = setup({ fastModeEnabled: true, withOption: true });
+
+    await sync(SESSION_ID, session, "off", "extra_usage_disabled");
+
+    expect(session.fastModeEnabled).toBe(false);
+    expect(session.fastModeDisabledReason).toBe("extra_usage_disabled");
+    expect(sessionUpdates).toHaveLength(2);
+    expect(sessionUpdates[0].update).toEqual({
+      sessionUpdate: "agent_message_chunk",
+      content: {
+        type: "text",
+        text: "**Fast mode turned off:** requires extra usage to be enabled for this account.",
+      },
+    });
+    expect(sessionUpdates[1].update).toMatchObject({ sessionUpdate: "config_option_update" });
+    expect(session.configOptions).toContainEqual(
+      createFastModeConfigOption(false, true, "extra_usage_disabled"),
+    );
+
+    // The same report again changes nothing the user can see: no repeat notice.
+    await sync(SESSION_ID, session, "off", "extra_usage_disabled");
+    expect(sessionUpdates).toHaveLength(2);
+  });
+
+  it("updates the description when only the reason changes", async () => {
+    const { sync, session, sessionUpdates } = setup({ fastModeEnabled: false, withOption: true });
+
+    await sync(SESSION_ID, session, "off", "not_first_party");
+
+    expect(session.fastModeEnabled).toBe(false);
+    // The toggle was already off, so the flip-time notice doesn't fire — only
+    // the description carries the explanation.
+    expect(sessionUpdates).toHaveLength(1);
+    expect(sessionUpdates[0].update).toMatchObject({ sessionUpdate: "config_option_update" });
+    expect(session.configOptions).toContainEqual(
+      createFastModeConfigOption(false, true, "not_first_party"),
+    );
+  });
+
+  it("drops a retained reason once fast mode comes back on", async () => {
+    const { sync, session } = setup({ fastModeEnabled: false, withOption: true });
+
+    await sync(SESSION_ID, session, "off", "network_error");
+    expect(session.fastModeDisabledReason).toBe("network_error");
+
+    await sync(SESSION_ID, session, "on");
+    expect(session.fastModeEnabled).toBe(true);
+    expect(session.fastModeDisabledReason).toBeUndefined();
+    expect(session.configOptions).toContainEqual(createFastModeConfigOption(true, true));
+  });
+
  it("preserves the retained setting (no clobber) when the model has no Fast mode option", async () => {
    // Model without fast support: the SDK reports a capability-driven state, not
    // the user's intent. We must leave session.fastModeEnabled untouched so it's
--- a/src/tests/session-config-options.test.ts
+++ b/src/tests/session-config-options.test.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect, beforeEach, vi } from "vitest";
-import { SessionNotification } from "@agentclientprotocol/sdk";
+import { ClientCapabilities, SessionNotification } from "@agentclientprotocol/sdk";
 import type { ModelInfo } from "@anthropic-ai/claude-agent-sdk";
 import type { AcpClient, ClaudeAcpAgent as ClaudeAcpAgentType } from "../acp-agent.js";
 import { makeMockQuery } from "./helpers.js";
@@ -1357,5 +1357,103 @@ describe("session config options", () => {
      const optionIds = capturedPermissionRequest.options.map((o: any) => o.optionId);
      expect(optionIds).toContain("auto");
    });
+
+    it("sends plan_update before permission when the tool call was already streamed", async () => {
+      (agent as unknown as { clientCapabilities: ClientCapabilities }).clientCapabilities = {
+        plan: {},
+      };
+      const session = (agent as unknown as { sessions: Record<string, any> }).sessions[SESSION_ID];
+      session.emittedToolCalls.add("toolu_plan_update");
+
+      const canUseTool = (agent as any).canUseTool(SESSION_ID);
+      await expect(
+        canUseTool(
+          "ExitPlanMode",
+          { plan: "# Approved plan" },
+          {
+            signal: new AbortController().signal,
+            suggestions: undefined,
+            toolUseID: "toolu_plan_update",
+          },
+        ),
+      ).rejects.toThrow("Tool use aborted");
+
+      expect(sessionUpdates).toEqual([
+        {
+          sessionId: SESSION_ID,
+          update: {
+            sessionUpdate: "plan_update",
+            plan: {
+              type: "markdown",
+              planId: "claude-plan",
+              content: "# Approved plan",
+            },
+          },
+        },
+      ]);
+      expect(capturedPermissionRequest.toolCall).toMatchObject({
+        toolCallId: "toolu_plan_update",
+        kind: "switch_mode",
+        rawInput: { plan: "# Approved plan" },
+        content: [],
+      });
+    });
+
+    it("approves ExitPlanMode after publishing the capable-client plan", async () => {
+      (agent as unknown as { clientCapabilities: ClientCapabilities }).clientCapabilities = {
+        plan: {},
+      };
+      const session = (agent as unknown as { sessions: Record<string, any> }).sessions[SESSION_ID];
+      session.modes.currentModeId = "plan";
+      permissionResponse = { outcome: { outcome: "selected", optionId: "default" } };
+
+      const result = await (agent as any).canUseTool(SESSION_ID)(
+        "ExitPlanMode",
+        { plan: "# Implement it" },
+        {
+          signal: new AbortController().signal,
+          suggestions: undefined,
+          toolUseID: "toolu_plan_approve",
+        },
+      );
+
+      expect(result.behavior).toBe("allow");
+      expect(session.modes.currentModeId).toBe("default");
+      expect(sessionUpdates.map((n) => n.update.sessionUpdate)).toEqual([
+        "plan_update",
+        "tool_call",
+        "current_mode_update",
+        "config_option_update",
+      ]);
+    });
+
+    it("rejects ExitPlanMode without switching mode after publishing the plan", async () => {
+      (agent as unknown as { clientCapabilities: ClientCapabilities }).clientCapabilities = {
+        plan: {},
+      };
+      const session = (agent as unknown as { sessions: Record<string, any> }).sessions[SESSION_ID];
+      session.modes.currentModeId = "plan";
+      permissionResponse = { outcome: { outcome: "selected", optionId: "plan" } };
+
+      const result = await (agent as any).canUseTool(SESSION_ID)(
+        "ExitPlanMode",
+        { plan: "# Keep planning" },
+        {
+          signal: new AbortController().signal,
+          suggestions: undefined,
+          toolUseID: "toolu_plan_reject",
+        },
+      );
+
+      expect(result).toMatchObject({
+        behavior: "deny",
+        message: "User rejected request to exit plan mode.",
+      });
+      expect(session.modes.currentModeId).toBe("plan");
+      expect(sessionUpdates.map((n) => n.update.sessionUpdate)).toEqual([
+        "plan_update",
+        "tool_call",
+      ]);
+    });
  });
 });
--- a/src/tests/tools.test.ts
+++ b/src/tests/tools.test.ts
@@ -491,6 +491,94 @@ describe("Bash terminal output", () => {
      });
    });

+    it("keys the terminal metas off the tool_use id, which is what was announced", () => {
+      // `toolInfoFromToolUse` announces the terminal as `toolUse.id`, so the
+      // result's metas have to use the same value for the client to match them
+      // up. A result block that disagrees (or omits `tool_use_id`) must not be
+      // allowed to retarget them.
+      const toolResult = {
+        ...makeBashResult("out", "", 0),
+        tool_use_id: "toolu_something_else",
+      };
+      const update = toolUpdateFromToolResult(toolResult, bashToolUse, true);
+
+      expect(update.content).toEqual([{ type: "terminal", terminalId: "toolu_bash" }]);
+      expect(update._meta).toEqual({
+        terminal_info: { terminal_id: "toolu_bash" },
+        terminal_output: { terminal_id: "toolu_bash", data: "out" },
+        terminal_exit: { terminal_id: "toolu_bash", exit_code: 0, signal: null },
+      });
+    });
+
+    it("falls back to the result's tool_use_id when the tool_use is unavailable", () => {
+      const toolResult = makeBashResult("out", "", 0);
+      const update = toolUpdateFromToolResult(toolResult, { name: "Bash" }, true);
+
+      expect(update.content).toEqual([{ type: "terminal", terminalId: "toolu_bash" }]);
+      expect(update._meta).toEqual({
+        terminal_info: { terminal_id: "toolu_bash" },
+        terminal_output: { terminal_id: "toolu_bash", data: "out" },
+        terminal_exit: { terminal_id: "toolu_bash", exit_code: 0, signal: null },
+      });
+    });
+
+    it("renders a code block instead of a dangling terminal when no id is available", () => {
+      // Previously this emitted `terminal_id: ""` for all three metas. Nothing
+      // on the client has a terminal under that id, so the output was stranded
+      // (Zed buffers output/exit for unknown terminals indefinitely) and the
+      // user saw an empty terminal. Degrade to the non-terminal rendering.
+      // `tool_use_id` is required on every result-block type, so a block without
+      // it can only arrive at runtime (an older or non-conforming emitter). The
+      // source guards for it with `"tool_use_id" in toolResult`, so exercise that
+      // path with a cast rather than pretending the type allows it.
+      const { content, type } = makeBashResult("out", "", 0);
+      const update = toolUpdateFromToolResult(
+        { content, type } as unknown as Parameters<typeof toolUpdateFromToolResult>[0],
+        { name: "Bash" },
+        true,
+      );
+
+      expect(update._meta).toBeUndefined();
+      expect(update.content).toEqual([
+        {
+          type: "content",
+          content: { type: "text", text: "```console\nout\n```" },
+        },
+      ]);
+    });
+
+    it("treats an empty tool_use id as no id and falls back to the result block", () => {
+      const toolResult = makeBashResult("out", "", 0);
+      const update = toolUpdateFromToolResult(toolResult, { id: "", name: "Bash" }, true);
+
+      expect(update.content).toEqual([{ type: "terminal", terminalId: "toolu_bash" }]);
+      expect(update._meta).toEqual({
+        terminal_info: { terminal_id: "toolu_bash" },
+        terminal_output: { terminal_id: "toolu_bash", data: "out" },
+        terminal_exit: { terminal_id: "toolu_bash", exit_code: 0, signal: null },
+      });
+    });
+
+    it("renders a code block when neither id is a usable string", () => {
+      // A present-but-undefined `tool_use_id` still satisfies an `in` check, and
+      // stringifying it would key all three metas on the literal "undefined" — an
+      // id no client ever created a terminal for, so the output strands exactly as
+      // it did under the old empty-string id.
+      const toolResult = {
+        ...makeBashResult("out", "", 0),
+        tool_use_id: undefined,
+      } as unknown as Parameters<typeof toolUpdateFromToolResult>[0];
+      const update = toolUpdateFromToolResult(toolResult, { id: "", name: "Bash" }, true);
+
+      expect(update._meta).toBeUndefined();
+      expect(update.content).toEqual([
+        {
+          type: "content",
+          content: { type: "text", text: "```console\nout\n```" },
+        },
+      ]);
+    });
+
    it("should include exit_code from return_code in terminal_exit", () => {
      const toolResult = makeBashResult("", "command not found", 127);
      const update = toolUpdateFromToolResult(toolResult, bashToolUse, true);
@@ -1610,6 +1698,176 @@ describe("toolInfoFromToolUse - ExitPlanMode", () => {
    expect(info.kind).toBe("switch_mode");
    expect(info.content).toEqual([]);
  });
+
+  it("publishes Markdown through plan_update for capable clients and keeps the tool call compact", () => {
+    const toolUse = {
+      type: "tool_use" as const,
+      name: "ExitPlanMode",
+      id: "toolu_plan_capable",
+      input: { plan: "# Implement\n\nRun the tests." },
+    };
+    const emittedPlanContent = new Map<string, string>();
+
+    const notifications = toAcpNotifications(
+      [toolUse],
+      "assistant",
+      "test-session",
+      {},
+      {} as AcpClient,
+      { log: () => {}, error: () => {} },
+      {
+        clientCapabilities: { plan: {} },
+        emittedPlanContent,
+      },
+    );
+
+    expect(notifications).toHaveLength(2);
+    expect(notifications[0].update).toEqual({
+      sessionUpdate: "plan_update",
+      plan: {
+        type: "markdown",
+        planId: "claude-plan",
+        content: "# Implement\n\nRun the tests.",
+      },
+    });
+    expect(notifications[1].update).toMatchObject({
+      sessionUpdate: "tool_call",
+      toolCallId: "toolu_plan_capable",
+      kind: "switch_mode",
+      rawInput: { plan: "# Implement\n\nRun the tests." },
+      content: [],
+    });
+
+    const repeated = toAcpNotifications(
+      [toolUse],
+      "assistant",
+      "test-session",
+      {},
+      {} as AcpClient,
+      { log: () => {}, error: () => {} },
+      {
+        clientCapabilities: { plan: {} },
+        emittedPlanContent,
+      },
+    );
+    expect(repeated.filter((n) => n.update.sessionUpdate === "plan_update")).toHaveLength(0);
+  });
+
+  it("defers live plan_update to the permission path while keeping the tool call compact", () => {
+    const emittedPlanContent = new Map<string, string>();
+    const notifications = toAcpNotifications(
+      [
+        {
+          type: "tool_use" as const,
+          name: "ExitPlanMode",
+          id: "toolu_plan_live",
+          input: { plan: "# Live plan" },
+        },
+      ],
+      "assistant",
+      "test-session",
+      {},
+      {} as AcpClient,
+      { log: () => {}, error: () => {} },
+      {
+        clientCapabilities: { plan: {} },
+        emittedPlanContent,
+        emitExitPlanUpdates: false,
+      },
+    );
+
+    expect(notifications).toHaveLength(1);
+    expect(notifications[0].update).toMatchObject({
+      sessionUpdate: "tool_call",
+      toolCallId: "toolu_plan_live",
+      kind: "switch_mode",
+      content: [],
+    });
+    expect(emittedPlanContent.size).toBe(0);
+  });
+
+  it("does not create plan_update for an empty Markdown plan", () => {
+    const notifications = toAcpNotifications(
+      [
+        {
+          type: "tool_use" as const,
+          name: "ExitPlanMode",
+          id: "toolu_plan_empty",
+          input: { plan: "  \n" },
+        },
+      ],
+      "assistant",
+      "test-session",
+      {},
+      {} as AcpClient,
+      { log: () => {}, error: () => {} },
+      { clientCapabilities: { plan: {} } },
+    );
+
+    expect(notifications).toHaveLength(1);
+    expect(notifications[0].update.sessionUpdate).toBe("tool_call");
+  });
+
+  it("scopes replayed subagent plans by their parent tool call", () => {
+    const emittedPlanContent = new Map<string, string>();
+    const render = (parentToolUseId: string, id: string, plan: string) =>
+      toAcpNotifications(
+        [{ type: "tool_use" as const, name: "ExitPlanMode", id, input: { plan } }],
+        "assistant",
+        "test-session",
+        {},
+        {} as AcpClient,
+        { log: () => {}, error: () => {} },
+        {
+          clientCapabilities: { plan: {} },
+          emittedPlanContent,
+          parentToolUseId,
+        },
+      );
+
+    const first = render("agent-parent-1", "toolu_subplan_1", "# First subagent plan");
+    const second = render("agent-parent-2", "toolu_subplan_2", "# Second subagent plan");
+
+    expect(first[0].update).toMatchObject({
+      sessionUpdate: "plan_update",
+      plan: { planId: "claude-plan:agent-parent-1" },
+    });
+    expect(second[0].update).toMatchObject({
+      sessionUpdate: "plan_update",
+      plan: { planId: "claude-plan:agent-parent-2" },
+    });
+    expect(emittedPlanContent.size).toBe(2);
+  });
+
+  it("keeps Markdown in the switch_mode tool call when plan_update is unsupported", () => {
+    const notifications = toAcpNotifications(
+      [
+        {
+          type: "tool_use" as const,
+          name: "ExitPlanMode",
+          id: "toolu_plan_fallback",
+          input: { plan: "# Fallback plan" },
+        },
+      ],
+      "assistant",
+      "test-session",
+      {},
+      {} as AcpClient,
+      { log: () => {}, error: () => {} },
+    );
+
+    expect(notifications).toHaveLength(1);
+    expect(notifications[0].update).toMatchObject({
+      sessionUpdate: "tool_call",
+      kind: "switch_mode",
+      content: [
+        {
+          type: "content",
+          content: { type: "text", text: "# Fallback plan" },
+        },
+      ],
+    });
+  });
 });

 describe("toolInfoFromToolUse - undefined input regression", () => {
@@ -2435,6 +2693,154 @@ describe("Agent/Task tool_result rendering from tool_use_result", () => {
  });
 });

+describe("tool_result_meta non-execution stamping", () => {
+  const mockClient = {} as AcpClient;
+  const mockLogger: Logger = { log: () => {}, error: () => {} };
+
+  const bashToolUse = {
+    type: "tool_use" as const,
+    id: "toolu_bash",
+    name: "Bash",
+    input: { command: "rm -rf build" },
+  };
+
+  const deniedResult: ToolResultBlockParam = {
+    type: "tool_result",
+    tool_use_id: "toolu_bash",
+    is_error: true,
+    content: "The user doesn't want to proceed with this tool use.",
+  };
+
+  it("stamps nonExecutionKind and userFeedback on the failed tool_call_update", () => {
+    const toolUseCache: ToolUseCache = { toolu_bash: bashToolUse };
+
+    const notifications = toAcpNotifications(
+      [deniedResult] as any,
+      "user",
+      "test-session",
+      toolUseCache,
+      mockClient,
+      mockLogger,
+      {
+        toolResultMeta: [
+          { id: "toolu_bash", non_execution_kind: "user-rejected", user_feedback: "use npm" },
+        ],
+      },
+    );
+
+    expect(notifications).toHaveLength(1);
+    expect(notifications[0].update).toMatchObject({
+      sessionUpdate: "tool_call_update",
+      toolCallId: "toolu_bash",
+      status: "failed",
+      _meta: {
+        claudeCode: {
+          toolName: "Bash",
+          nonExecutionKind: "user-rejected",
+          userFeedback: "use npm",
+        },
+      },
+    });
+  });
+
+  it("attributes entries by tool_use_id, so only the flagged result in a batch is stamped", () => {
+    const toolUseCache: ToolUseCache = {
+      toolu_bash: bashToolUse,
+      toolu_bash2: { ...bashToolUse, id: "toolu_bash2" },
+    };
+
+    const notifications = toAcpNotifications(
+      [
+        deniedResult,
+        {
+          type: "tool_result",
+          tool_use_id: "toolu_bash2",
+          content: "ok",
+        },
+      ] as any,
+      "user",
+      "test-session",
+      toolUseCache,
+      mockClient,
+      mockLogger,
+      { toolResultMeta: [{ id: "toolu_bash", non_execution_kind: "user-rejected" }] },
+    );
+
+    expect(notifications).toHaveLength(2);
+    const [denied, ran] = notifications.map((n) => n.update) as any[];
+    expect(denied._meta.claudeCode).toMatchObject({ nonExecutionKind: "user-rejected" });
+    // No user_feedback on the wire entry → no userFeedback key at all.
+    expect(denied._meta.claudeCode).not.toHaveProperty("userFeedback");
+    expect(ran._meta.claudeCode).not.toHaveProperty("nonExecutionKind");
+  });
+
+  it("ignores a malformed sidecar and malformed entries", () => {
+    for (const malformed of [
+      "user-rejected", // not an array
+      [{ non_execution_kind: "user-rejected" }], // entry missing id
+      [{ id: "toolu_bash", non_execution_kind: 7 }], // kind not a string
+      [null, 42], // entries not objects
+    ]) {
+      const toolUseCache: ToolUseCache = { toolu_bash: bashToolUse };
+      const notifications = toAcpNotifications(
+        [deniedResult] as any,
+        "user",
+        "test-session",
+        toolUseCache,
+        mockClient,
+        mockLogger,
+        { toolResultMeta: malformed },
+      );
+
+      expect(notifications).toHaveLength(1);
+      expect((notifications[0].update as any)._meta.claudeCode).not.toHaveProperty(
+        "nonExecutionKind",
+      );
+    }
+  });
+
+  it("stamps the resolve of a permission-surfaced suppressed tool (Task*)", () => {
+    // A TaskGet surfaced as a real tool_call by the permission flow never gets
+    // a tool_call_update from the suppressed Task* branch; the wasEmitted
+    // resolve must carry the denial kind too.
+    const taskGetToolUse = {
+      type: "tool_use" as const,
+      id: "toolu_taskget",
+      name: "TaskGet",
+      input: { taskId: "1" },
+    };
+    const toolUseCache: ToolUseCache = { toolu_taskget: taskGetToolUse };
+
+    const notifications = toAcpNotifications(
+      [
+        {
+          type: "tool_result",
+          tool_use_id: "toolu_taskget",
+          is_error: true,
+          content: "The user doesn't want to proceed with this tool use.",
+        },
+      ] as any,
+      "user",
+      "test-session",
+      toolUseCache,
+      mockClient,
+      mockLogger,
+      {
+        emittedToolCalls: new Set(["toolu_taskget"]),
+        toolResultMeta: [{ id: "toolu_taskget", non_execution_kind: "user-rejected" }],
+      },
+    );
+
+    expect(notifications).toHaveLength(1);
+    expect(notifications[0].update).toMatchObject({
+      sessionUpdate: "tool_call_update",
+      toolCallId: "toolu_taskget",
+      status: "failed",
+      _meta: { claudeCode: { toolName: "TaskGet", nonExecutionKind: "user-rejected" } },
+    });
+  });
+});
+
 describe("structured tool_use_result rendering (Read/Bash/WebSearch)", () => {
  describe("Read", () => {
    const readToolUse = {
--- a/src/tools.ts
+++ b/src/tools.ts
@@ -130,6 +130,7 @@ export function toolInfoFromToolUse(
  toolUse: any,
  supportsTerminalOutput: boolean = false,
  cwd?: string,
+  usePlanUpdate: boolean = false,
 ): ToolInfo {
  const name = toolUse.name;

@@ -433,9 +434,15 @@ export function toolInfoFromToolUse(
      return {
        title: "Ready to code?",
        kind: "switch_mode",
-        content: planInput?.plan
-          ? [{ type: "content" as const, content: { type: "text" as const, text: planInput.plan } }]
-          : [],
+        content:
+          !usePlanUpdate && planInput?.plan
+            ? [
+                {
+                  type: "content" as const,
+                  content: { type: "text" as const, text: planInput.plan },
+                },
+              ]
+            : [],
      };
    }

@@ -686,7 +693,19 @@ export function toolUpdateFromToolResult(

    case "Bash": {
      const result = toolResult.content;
-      const terminalId = "tool_use_id" in toolResult ? String(toolResult.tool_use_id) : "";
+      // The terminal was announced under the tool_use's own id (see
+      // `toolInfoFromToolUse`), so key the output/exit metas off that: it is the
+      // id the client actually created a terminal for. `toolResult.tool_use_id`
+      // is the same value whenever present — the caller looks the tool_use up by
+      // it — so preferring `toolUse.id` only adds a source for the case where the
+      // result block carries no id at all. Anything that isn't a non-empty
+      // string is no id at all: `""` matches no terminal, and stringifying a
+      // present-but-undefined field would invent the literal `"undefined"`.
+      const terminalIdOf = (id: unknown): string | undefined =>
+        typeof id === "string" && id.length > 0 ? id : undefined;
+      const terminalId: string | undefined =
+        terminalIdOf(toolUse?.id) ??
+        terminalIdOf("tool_use_id" in toolResult ? toolResult.tool_use_id : undefined);
      const isError = "is_error" in toolResult && toolResult.is_error;

      // Extract output and exit code from either format:
@@ -767,7 +786,14 @@ export function toolUpdateFromToolResult(
        }
      }

-      if (supportsTerminalOutput) {
+      // Without a terminal id there is nothing the client can reconcile these
+      // metas against, and emitting them anyway strands the output: a client that
+      // buffers output/exit for terminals it has not been told about (Zed keeps
+      // them in `pending_terminal_output`/`pending_terminal_exit`, drained only on
+      // a matching create) would hold them forever behind an id that never
+      // arrives, showing an empty terminal. Fall through to the code-block
+      // rendering below instead.
+      if (supportsTerminalOutput && terminalId !== undefined) {
        return {
          content: [{ type: "terminal" as const, terminalId }],
          _meta: {