chore(main): release 0.29.2 (#566)

🤖 I have created a release *beep* *boop*
---


##
[0.29.2](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.29.1...v0.29.2)
(2026-04-17)


### Bug Fixes

* Guard against null usage tokens
([#565](https://github.com/agentclientprotocol/claude-agent-acp/issues/565))
([f7dc300](f7dc300a16)),
closes
[#564](https://github.com/agentclientprotocol/claude-agent-acp/issues/564)

---
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>

.github/workflows/publish.yml

@@ -16,14 +16,14 @@ jobs:
       # Generating a GitHub token, so that PRs and tags created by
       # the release-please-action can trigger actions workflows.
       - name: Generate GitHub token
-        uses: actions/create-github-app-token@f8d387b68d61c58ab83c6c016672934102569859
+        uses: actions/create-github-app-token@1b10c78c7865c340bc4f6099eb2f838309f1e8c3
         id: generate-token
         with:
           # GitHub App ID secret name
           app-id: ${{ secrets.RELEASE_PLZ_APP_ID }}
           # GitHub App private key secret name
           private-key: ${{ secrets.RELEASE_PLZ_APP_PRIVATE_KEY }}
-      - uses: googleapis/release-please-action@16a9c90856f42705d54a6fda1823352bdc62cf38
+      - uses: googleapis/release-please-action@5c625bfb5d1ff62eadeeb3772007f7f66fdcf071
         id: release
         with:
           token: ${{ steps.generate-token.outputs.token }}
@@ -38,7 +38,8 @@ jobs:
     name: Build (${{ matrix.target }})
     runs-on: ubuntu-latest
     needs: [release-please]
-    if: ${{ needs.release-please.outputs.release_created }}
+    # TODO: Re-enable once Bun SDK compatibility is fixed
+    if: false
     permissions:
       contents: read
     timeout-minutes: 15
@@ -99,7 +100,7 @@ jobs:
           fi
 
       - name: Upload artifact
-        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a
         with:
           name: ${{ matrix.archive }}
           path: ${{ matrix.archive }}
@@ -107,7 +108,7 @@ jobs:
   publish-npm:
     name: Publish to npm
     runs-on: ubuntu-latest
-    needs: [build-binaries, release-please]
+    needs: [release-please]
     if: ${{ needs.release-please.outputs.release_created }}
     environment: release # Optional: for enhanced security
     permissions:
@@ -129,8 +130,9 @@ jobs:
   release:
     name: Create Release
     runs-on: ubuntu-latest
-    needs: [build-binaries, publish-npm, release-please]
-    if: ${{ needs.release-please.outputs.release_created }}
+    needs: [publish-npm, release-please]
+    # TODO: Re-enable once Bun SDK compatibility is fixed
+    if: false
     permissions:
       contents: write
 

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "0.24.2"
+  ".": "0.29.2"
 }

CHANGELOG.md

@@ -1,5 +1,104 @@
 # Changelog
 
+## [0.29.2](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.29.1...v0.29.2) (2026-04-17)
+
+
+### Bug Fixes
+
+* Guard against null usage tokens ([#565](https://github.com/agentclientprotocol/claude-agent-acp/issues/565)) ([f7dc300](https://github.com/agentclientprotocol/claude-agent-acp/commit/f7dc300a165e70f6426f53920f12e24c04033cdc)), closes [#564](https://github.com/agentclientprotocol/claude-agent-acp/issues/564)
+
+## [0.29.1](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.29.0...v0.29.1) (2026-04-17)
+
+
+### Bug Fixes
+
+* emit usage updates from Claude stream events ([#506](https://github.com/agentclientprotocol/claude-agent-acp/issues/506)) ([dd67450](https://github.com/agentclientprotocol/claude-agent-acp/commit/dd67450fd9bddc82db3e71273b535e07b2672804))
+* Remove dot from auto mode description ([#561](https://github.com/agentclientprotocol/claude-agent-acp/issues/561)) ([2ecfa83](https://github.com/agentclientprotocol/claude-agent-acp/commit/2ecfa83b26db58deaded210463fa6ff21d0dff70))
+* Update to claude-agent-sdk 0.2.112 to fix Auto bug with Opus 4.7 ([#562](https://github.com/agentclientprotocol/claude-agent-acp/issues/562)) ([079614a](https://github.com/agentclientprotocol/claude-agent-acp/commit/079614ab05afba17e2cce0d3d238df7b90e17389))
+
+## [0.29.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.28.0...v0.29.0) (2026-04-16)
+
+
+### Features
+
+* Update to claude-agent-sdk 0.2.111 (Opus 4.7) ([#557](https://github.com/agentclientprotocol/claude-agent-acp/issues/557)) ([85cd70c](https://github.com/agentclientprotocol/claude-agent-acp/commit/85cd70c9f3be47c9c404958547c4046d866db1c9))
+
+## [0.28.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.27.0...v0.28.0) (2026-04-15)
+
+
+### Features
+
+* Update to claude-agent-sdk 0.2.109 ([#549](https://github.com/agentclientprotocol/claude-agent-acp/issues/549)) ([07a0fbc](https://github.com/agentclientprotocol/claude-agent-acp/commit/07a0fbc2f6bc388541d064a436412bdd850772cb))
+
+## [0.27.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.26.0...v0.27.0) (2026-04-13)
+
+
+### Features
+
+* allow clients to opt into receiving raw SDK messages ([#527](https://github.com/agentclientprotocol/claude-agent-acp/issues/527)) ([403a668](https://github.com/agentclientprotocol/claude-agent-acp/commit/403a668078c067868062ed26cd4d3e36665b66b6))
+* Update to claude-agent-sdk 0.2.104 ([#537](https://github.com/agentclientprotocol/claude-agent-acp/issues/537)) ([6811943](https://github.com/agentclientprotocol/claude-agent-acp/commit/6811943f57ef08616be633a8197223d4072663cf))
+
+
+### Bug Fixes
+
+* Allow auto mode after plan mode and send description for auto mode ([#528](https://github.com/agentclientprotocol/claude-agent-acp/issues/528)) ([fb9aced](https://github.com/agentclientprotocol/claude-agent-acp/commit/fb9aced3151c40694f1f01fd95665c4f5d90eb67))
+* Better remote check for auth methods ([#538](https://github.com/agentclientprotocol/claude-agent-acp/issues/538)) ([93f58c0](https://github.com/agentclientprotocol/claude-agent-acp/commit/93f58c0d2fcf7365c7ca5a6e52f56663e2065ddb))
+* better shutdown logic ([#543](https://github.com/agentclientprotocol/claude-agent-acp/issues/543)) ([9fb631f](https://github.com/agentclientprotocol/claude-agent-acp/commit/9fb631f5d76a5c5f6f0a1b61bdef05fe368c754c))
+* exit process when ACP connection closes ([#530](https://github.com/agentclientprotocol/claude-agent-acp/issues/530)) ([5c81e99](https://github.com/agentclientprotocol/claude-agent-acp/commit/5c81e99fe5ccdf774819b7ff3a2bc78a6519d730))
+* guard tool info rendering when tool_use input is undefined ([#536](https://github.com/agentclientprotocol/claude-agent-acp/issues/536)) ([d627b8c](https://github.com/agentclientprotocol/claude-agent-acp/commit/d627b8c5e95be31ac03923ef67d91748ec8564c5))
+* Remove backup auth check from new session ([#544](https://github.com/agentclientprotocol/claude-agent-acp/issues/544)) ([32b16c1](https://github.com/agentclientprotocol/claude-agent-acp/commit/32b16c1ad99394238b0e5cd6c2f761c12debe142))
+
+## [0.26.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.25.3...v0.26.0) (2026-04-08)
+
+
+### Features
+
+* Update claude-agent-sdk to 0.2.96 ([#526](https://github.com/agentclientprotocol/claude-agent-acp/issues/526)) ([c073131](https://github.com/agentclientprotocol/claude-agent-acp/commit/c07313148808a55f27f385c10babbaf7511a7f12))
+
+
+### Bug Fixes
+
+* Remove bun builds from release ([#525](https://github.com/agentclientprotocol/claude-agent-acp/issues/525)) ([fcf5aaf](https://github.com/agentclientprotocol/claude-agent-acp/commit/fcf5aaf06dfe9f7d1b285b976eeb2d1e20ea8dec))
+* Use TUI login for remote environments ([#523](https://github.com/agentclientprotocol/claude-agent-acp/issues/523)) ([cc73e37](https://github.com/agentclientprotocol/claude-agent-acp/commit/cc73e37b41678aa67813c4fbef66ba33ca538743))
+
+## [0.25.3](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.25.2...v0.25.3) (2026-04-06)
+
+
+### Bug Fixes
+
+* Drop claude-agent-sdk back to 0.2.91 to fix broken import ([#513](https://github.com/agentclientprotocol/claude-agent-acp/issues/513)) ([26f3e8a](https://github.com/agentclientprotocol/claude-agent-acp/commit/26f3e8a5216295985fadb80fb3b977045c0c1b2c))
+* Recreate resumed sessions when params change ([#515](https://github.com/agentclientprotocol/claude-agent-acp/issues/515)) ([aa82193](https://github.com/agentclientprotocol/claude-agent-acp/commit/aa82193330026bae132fed8391c47dde777dcf5a))
+
+## [0.25.2](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.25.1...v0.25.2) (2026-04-06)
+
+
+### Bug Fixes
+
+* prioritize ANTHROPIC_MODEL env var over settings.model in model … ([#505](https://github.com/agentclientprotocol/claude-agent-acp/issues/505)) ([bea1a40](https://github.com/agentclientprotocol/claude-agent-acp/commit/bea1a40e9bfe1e06672b118a727f9339def3be23))
+
+## [0.25.1](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.25.0...v0.25.1) (2026-04-06)
+
+
+### Bug Fixes
+
+* add `auto` to valid modes in applySessionMode to fix mode cycling ([#507](https://github.com/agentclientprotocol/claude-agent-acp/issues/507)) ([15e91fb](https://github.com/agentclientprotocol/claude-agent-acp/commit/15e91fb5c3449de2600b583cb7a8d36b5b510443))
+
+## [0.25.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.24.2...v0.25.0) (2026-04-03)
+
+
+### Features
+
+* Add auto permission mode support ([#501](https://github.com/agentclientprotocol/claude-agent-acp/issues/501)) ([a161453](https://github.com/agentclientprotocol/claude-agent-acp/commit/a16145396fe2e6ead8734478961b2de65707e335))
+* Add separate Claude and Console terminal logins ([#502](https://github.com/agentclientprotocol/claude-agent-acp/issues/502)) ([063cd35](https://github.com/agentclientprotocol/claude-agent-acp/commit/063cd353809df8f3dda9e57d8ea848c0a6d44257))
+* Update to claude-agent-sdk 0.2.91 ([#500](https://github.com/agentclientprotocol/claude-agent-acp/issues/500)) ([65a2230](https://github.com/agentclientprotocol/claude-agent-acp/commit/65a223038576d72b74e1483fed10e982a1f842bd))
+
+
+### Bug Fixes
+
+* log warnings for malformed settings files instead of silent fallback ([#486](https://github.com/agentclientprotocol/claude-agent-acp/issues/486)) ([ae6c388](https://github.com/agentclientprotocol/claude-agent-acp/commit/ae6c38831415f9fc1de2d3dd1d4a247becbbd32f))
+* prevent race conditions in SettingsManager setCwd and debounce ([#485](https://github.com/agentclientprotocol/claude-agent-acp/issues/485)) ([7506223](https://github.com/agentclientprotocol/claude-agent-acp/commit/7506223cffb1aba4b4560feda11f69a1395a8c9d))
+* use current model's context window for usage_update size ([#412](https://github.com/agentclientprotocol/claude-agent-acp/issues/412)) ([d07799d](https://github.com/agentclientprotocol/claude-agent-acp/commit/d07799d7b3b4e438c8b158266c79723a0b592c07))
+
 ## [0.24.2](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.24.1...v0.24.2) (2026-03-27)
 
 

package.json

@@ -3,7 +3,7 @@
   "publishConfig": {
     "access": "public"
   },
-  "version": "0.24.2",
+  "version": "0.29.2",
   "description": "An ACP-compatible coding agent powered by the Claude Agent SDK (TypeScript)",
   "main": "dist/lib.js",
   "types": "dist/lib.d.ts",
@@ -60,22 +60,22 @@
   "author": "Zed Industries",
   "license": "Apache-2.0",
   "dependencies": {
-    "@agentclientprotocol/sdk": "0.17.0",
-    "@anthropic-ai/claude-agent-sdk": "0.2.84",
+    "@agentclientprotocol/sdk": "0.19.0",
+    "@anthropic-ai/claude-agent-sdk": "0.2.112",
     "zod": "^3.25.0 || ^4.0.0"
   },
   "devDependencies": {
-    "@anthropic-ai/sdk": "0.80.0",
+    "@anthropic-ai/sdk": "0.89.0",
     "@eslint/js": "10.0.1",
-    "@types/node": "25.5.0",
-    "@typescript-eslint/eslint-plugin": "8.57.2",
-    "@typescript-eslint/parser": "8.57.2",
-    "eslint": "10.1.0",
+    "@types/node": "25.6.0",
+    "@typescript-eslint/eslint-plugin": "8.58.2",
+    "@typescript-eslint/parser": "8.58.2",
+    "eslint": "10.2.0",
     "eslint-config-prettier": "10.1.8",
-    "globals": "17.4.0",
-    "prettier": "3.8.1",
+    "globals": "17.5.0",
+    "prettier": "3.8.3",
     "ts-node": "10.9.2",
-    "typescript": "5.9.3",
-    "vitest": "4.1.1"
+    "typescript": "6.0.3",
+    "vitest": "4.1.4"
   }
 }

src/acp-agent.ts

@@ -48,19 +48,18 @@ import {
   listSessions,
   McpServerConfig,
   ModelInfo,
+  ModelUsage,
   Options,
   PermissionMode,
   Query,
   query,
   SDKPartialAssistantMessage,
-  SDKResultMessage,
   SDKUserMessage,
   SlashCommand,
 } from "@anthropic-ai/claude-agent-sdk";
 import { ContentBlockParam } from "@anthropic-ai/sdk/resources";
 import { BetaContentBlock, BetaRawContentBlockDelta } from "@anthropic-ai/sdk/resources/beta.mjs";
 import { randomUUID } from "node:crypto";
-import * as fs from "node:fs";
 import * as os from "node:os";
 import * as path from "node:path";
 import packageJson from "../package.json" with { type: "json" };
@@ -108,11 +107,30 @@ type AccumulatedUsage = {
   cachedWriteTokens: number;
 };
 
+type UsageSnapshot = {
+  input_tokens: number;
+  output_tokens: number;
+  cache_read_input_tokens: number;
+  cache_creation_input_tokens: number;
+};
+
+const ZERO_USAGE = Object.freeze({
+  input_tokens: 0,
+  output_tokens: 0,
+  cache_read_input_tokens: 0,
+  cache_creation_input_tokens: 0,
+});
+
+const DEFAULT_CONTEXT_WINDOW = 200000;
+
 type Session = {
   query: Query;
   input: Pushable<SDKUserMessage>;
   cancelled: boolean;
   cwd: string;
+  /** Serialized snapshot of session-defining params (cwd, mcpServers) used to
+   *  detect when loadSession/resumeSession is called with changed values. */
+  sessionFingerprint: string;
   settingsManager: SettingsManager;
   accumulatedUsage: AccumulatedUsage;
   modes: SessionModeState;
@@ -122,8 +140,27 @@ type Session = {
   pendingMessages: Map<string, { resolve: (cancelled: boolean) => void; order: number }>;
   nextPendingOrder: number;
   abortController: AbortController;
+  emitRawSDKMessages: boolean | SDKMessageFilter[];
+  /** Context window size of the last top-level assistant model, carried across
+   *  prompts so mid-stream usage_update notifications report a correct `size`
+   *  before the turn's first result message arrives. Defaults to
+   *  DEFAULT_CONTEXT_WINDOW, refreshed from each result's modelUsage, and
+   *  invalidated when the user switches the session's model. */
+  contextWindowSize: number;
 };
 
+/** Compute a stable fingerprint of the session-defining params so we can
+ *  detect when a loadSession/resumeSession call requires tearing down and
+ *  recreating the underlying Query process.  MCP servers are sorted by name
+ *  so that ordering differences don't trigger unnecessary recreations. */
+function computeSessionFingerprint(params: {
+  cwd: string;
+  mcpServers?: NewSessionRequest["mcpServers"];
+}): string {
+  const servers = [...(params.mcpServers ?? [])].sort((a, b) => a.name.localeCompare(b.name));
+  return JSON.stringify({ cwd: params.cwd, mcpServers: servers });
+}
+
 type BackgroundTerminal =
   | {
       handle: TerminalHandle;
@@ -135,6 +172,11 @@ type BackgroundTerminal =
       pendingOutput: TerminalOutputResponse;
     };
 
+export type SDKMessageFilter = {
+  type: string;
+  subtype?: string;
+};
+
 /**
  * Extra metadata that can be given when creating a new session.
  */
@@ -156,6 +198,14 @@ export type NewSessionMeta = {
      *   - tools (passed through; defaults to claude_code preset if not provided)
      */
     options?: Options;
+    /**
+     * When set, raw SDK messages are emitted as extNotification("_claude/sdkMessage", message)
+     * in addition to normal processing.
+     * - true: emit all messages
+     * - false/undefined: emit nothing (default)
+     * - SDKMessageFilter[]: emit only messages matching at least one filter
+     */
+    emitRawSDKMessages?: boolean | SDKMessageFilter[];
   };
   additionalRoots?: string[];
 };
@@ -233,6 +283,7 @@ const ALLOW_BYPASS = !IS_ROOT || !!process.env.IS_SANDBOX;
 const LOCAL_ONLY_COMMANDS = new Set(["/context", "/heapdump", "/extra-usage"]);
 
 const PERMISSION_MODE_ALIASES: Record<string, PermissionMode> = {
+  auto: "auto",
   default: "default",
   acceptedits: "acceptEdits",
   dontask: "dontAsk",
@@ -306,25 +357,85 @@ export class ClaudeAcpAgent implements Agent {
       },
     };
 
-    const terminalAuthMethod: any = {
-      description: "Run `claude /login` in the terminal",
-      name: "Log in with Claude",
-      id: "claude-login",
-      type: "terminal",
-      args: ["--cli"],
-    };
     const supportsTerminalAuth = request.clientCapabilities?.auth?.terminal === true;
-
-    // If client supports terminal-auth capability, use that instead.
     const supportsMetaTerminalAuth = request.clientCapabilities?._meta?.["terminal-auth"] === true;
-    if (supportsMetaTerminalAuth) {
-      terminalAuthMethod._meta = {
-        "terminal-auth": {
-          command: process.execPath,
-          args: [...process.argv.slice(1), "--cli"],
-          label: "Claude Login",
-        },
+
+    // Detect remote environments where the OAuth browser redirect to localhost
+    // won't work. This matches the SDK's internal isRemote check. In these cases,
+    // the `auth login` subcommand would fall back to a device-code-like manual
+    // flow, which doesn't work well over ACP, so we offer the TUI login instead.
+    const isRemote = !!(
+      process.env.NO_BROWSER ||
+      process.env.SSH_CONNECTION ||
+      process.env.SSH_CLIENT ||
+      process.env.SSH_TTY ||
+      process.env.CLAUDE_CODE_REMOTE
+    );
+    const terminalAuthMethods: AuthMethod[] = [];
+
+    if (isRemote) {
+      const remoteLoginMethod: AuthMethod = {
+        description: "Run `claude /login` in the terminal",
+        name: "Log in with Claude",
+        id: "claude-login",
+        type: "terminal",
+        args: ["--cli"],
       };
+
+      if (supportsMetaTerminalAuth) {
+        remoteLoginMethod._meta = {
+          "terminal-auth": {
+            command: process.execPath,
+            args: [...process.argv.slice(1), "--cli"],
+            label: "Claude Login",
+          },
+        };
+      }
+
+      if (!shouldHideClaudeAuth() && (supportsTerminalAuth || supportsMetaTerminalAuth)) {
+        terminalAuthMethods.push(remoteLoginMethod);
+      }
+    } else {
+      const claudeLoginMethod: AuthMethod = {
+        description: "Use Claude subscription ",
+        name: "Claude Subscription",
+        id: "claude-ai-login",
+        type: "terminal",
+        args: ["--cli", "auth", "login", "--claudeai"],
+      };
+
+      const consoleLoginMethod: AuthMethod = {
+        description: "Use Anthropic Console (API usage billing)",
+        name: "Anthropic Console",
+        id: "console-login",
+        type: "terminal",
+        args: ["--cli", "auth", "login", "--console"],
+      };
+
+      if (supportsMetaTerminalAuth) {
+        const baseArgs = process.argv.slice(1);
+        claudeLoginMethod._meta = {
+          "terminal-auth": {
+            command: process.execPath,
+            args: [...baseArgs, "--cli", "auth", "login", "--claudeai"],
+            label: "Claude Login",
+          },
+        };
+        consoleLoginMethod._meta = {
+          "terminal-auth": {
+            command: process.execPath,
+            args: [...baseArgs, "--cli", "auth", "login", "--console"],
+            label: "Anthropic Console Login",
+          },
+        };
+      }
+
+      if (!shouldHideClaudeAuth() && (supportsTerminalAuth || supportsMetaTerminalAuth)) {
+        terminalAuthMethods.push(claudeLoginMethod);
+      }
+      if (supportsTerminalAuth || supportsMetaTerminalAuth) {
+        terminalAuthMethods.push(consoleLoginMethod);
+      }
     }
 
     return {
@@ -356,24 +467,11 @@ export class ClaudeAcpAgent implements Agent {
         title: "Claude Agent",
         version: packageJson.version,
       },
-      authMethods: [
-        ...(!shouldHideClaudeAuth() && (supportsTerminalAuth || supportsMetaTerminalAuth)
-          ? [terminalAuthMethod]
-          : []),
-        ...(supportsGatewayAuth ? [gatewayAuthMethod] : []),
-      ],
+      authMethods: [...terminalAuthMethods, ...(supportsGatewayAuth ? [gatewayAuthMethod] : [])],
     };
   }
 
   async newSession(params: NewSessionRequest): Promise<NewSessionResponse> {
-    if (
-      !this.gatewayAuthMeta &&
-      fs.existsSync(path.resolve(os.homedir(), ".claude.json.backup")) &&
-      !fs.existsSync(path.resolve(os.homedir(), ".claude.json"))
-    ) {
-      throw RequestError.authRequired();
-    }
-
     const response = await this.createSession(params, {
       // Revisit these meta values once we support resume
       resume: (params._meta as NewSessionMeta | undefined)?.claudeCode?.options?.resume,
@@ -468,6 +566,8 @@ export class ClaudeAcpAgent implements Agent {
     };
 
     let lastAssistantTotalUsage: number | null = null;
+    let lastAssistantUsage: UsageSnapshot | null = null;
+    let lastAssistantModel: string | null = null;
 
     const userMessage = promptToClaude(params);
 
@@ -509,6 +609,16 @@ export class ClaudeAcpAgent implements Agent {
           break;
         }
 
+        if (
+          session.emitRawSDKMessages &&
+          shouldEmitRawMessage(session.emitRawSDKMessages, message)
+        ) {
+          await this.client.extNotification("_claude/sdkMessage", {
+            sessionId: params.sessionId,
+            message: message as Record<string, unknown>,
+          });
+        }
+
         switch (message.type) {
           case "system":
             switch (message.subtype) {
@@ -527,9 +637,27 @@ export class ClaudeAcpAgent implements Agent {
                 break;
               }
               case "compact_boundary": {
-                // We don't know the exact size, but since we compacted,
-                // we set it to zero. The client gets the exact size on the next message.
+                // Send used:0 immediately so the client doesn't keep showing
+                // the stale pre-compaction context size until the next turn.
+                //
+                // This is a deliberate approximation: we don't know the exact
+                // post-compaction token count (only the SDK's next API call
+                // reveals that). But used:0 is directionally correct — context
+                // just dropped dramatically — and the real value replaces it
+                // within seconds when the next result message arrives.
+                // The alternative (no update) leaves the client showing e.g.
+                // "944k/1m" right after the user sees "Compacting completed",
+                // which is confusing and wrong.
                 lastAssistantTotalUsage = 0;
+                lastAssistantUsage = null;
+                await this.client.sessionUpdate({
+                  sessionId: message.session_id,
+                  update: {
+                    sessionUpdate: "usage_update",
+                    used: 0,
+                    size: session.contextWindowSize,
+                  },
+                });
                 await this.client.sessionUpdate({
                   sessionId: message.session_id,
                   update: {
@@ -562,7 +690,11 @@ export class ClaudeAcpAgent implements Agent {
               case "task_started":
               case "task_notification":
               case "task_progress":
+              case "task_updated":
               case "elicitation_complete":
+              case "plugin_install":
+              case "memory_recall":
+              case "notification":
               case "api_retry":
                 // Todo: process via status api: https://docs.claude.com/en/docs/claude-code/hooks#hook-output
                 break;
@@ -578,10 +710,16 @@ export class ClaudeAcpAgent implements Agent {
             session.accumulatedUsage.cachedReadTokens += message.usage.cache_read_input_tokens;
             session.accumulatedUsage.cachedWriteTokens += message.usage.cache_creation_input_tokens;
 
-            // Calculate context window size from modelUsage (minimum across all models used)
-            const contextWindows = Object.values(message.modelUsage).map((m) => m.contextWindow);
-            const contextWindowSize =
-              contextWindows.length > 0 ? Math.min(...contextWindows) : 200000;
+            const matchingModelUsage = lastAssistantModel
+              ? getMatchingModelUsage(message.modelUsage, lastAssistantModel)
+              : null;
+            // Only overwrite when we have an authoritative value — a miss
+            // (e.g. a turn with no top-level assistant message) would
+            // otherwise discard the window learned on a prior turn and
+            // leave the next prompt's mid-stream updates reporting 200k.
+            if (matchingModelUsage) {
+              session.contextWindowSize = matchingModelUsage.contextWindow;
+            }
 
             // Send usage_update notification
             if (lastAssistantTotalUsage !== null) {
@@ -590,7 +728,7 @@ export class ClaudeAcpAgent implements Agent {
                 update: {
                   sessionUpdate: "usage_update",
                   used: lastAssistantTotalUsage,
-                  size: contextWindowSize,
+                  size: session.contextWindowSize,
                   cost: {
                     amount: message.total_cost_usd,
                     currency: "USD",
@@ -664,6 +802,57 @@ export class ClaudeAcpAgent implements Agent {
             break;
           }
           case "stream_event": {
+            if (
+              message.parent_tool_use_id === null &&
+              (message.event.type === "message_start" || message.event.type === "message_delta")
+            ) {
+              if (message.event.type === "message_start") {
+                lastAssistantUsage = snapshotFromUsage(message.event.message.usage);
+                const model = message.event.message.model;
+                if (model && model !== "<synthetic>") {
+                  lastAssistantModel = model;
+                  // Only upgrade from the default — once a `result` has given
+                  // us an authoritative window, trust it over the heuristic.
+                  // Model switches invalidate the cached window via
+                  // `syncSessionConfigState`, which resets us back to the
+                  // default so this branch runs again for the new model.
+                  if (session.contextWindowSize === DEFAULT_CONTEXT_WINDOW) {
+                    const inferred = inferContextWindowFromModel(model);
+                    if (inferred !== null) {
+                      session.contextWindowSize = inferred;
+                    }
+                  }
+                }
+              } else {
+                const usage = message.event.usage;
+                const prev: Readonly<UsageSnapshot> = lastAssistantUsage ?? ZERO_USAGE;
+                // Per Anthropic API, message_delta usage fields are *cumulative*;
+                // nullable fields (input_tokens and the cache fields) fall back
+                // to the prior snapshot when the server omits them from this
+                // delta. Only output_tokens is guaranteed non-null.
+                lastAssistantUsage = {
+                  input_tokens: usage.input_tokens ?? prev.input_tokens,
+                  output_tokens: usage.output_tokens,
+                  cache_read_input_tokens:
+                    usage.cache_read_input_tokens ?? prev.cache_read_input_tokens,
+                  cache_creation_input_tokens:
+                    usage.cache_creation_input_tokens ?? prev.cache_creation_input_tokens,
+                };
+              }
+
+              const nextUsage = totalTokens(lastAssistantUsage);
+              if (nextUsage !== lastAssistantTotalUsage) {
+                lastAssistantTotalUsage = nextUsage;
+                await this.client.sessionUpdate({
+                  sessionId: params.sessionId,
+                  update: {
+                    sessionUpdate: "usage_update",
+                    used: nextUsage,
+                    size: session.contextWindowSize,
+                  },
+                });
+              }
+            }
             for (const notification of streamEventToAcpNotifications(
               message,
               params.sessionId,
@@ -706,14 +895,16 @@ export class ClaudeAcpAgent implements Agent {
               }
             }
 
-            // Store latest assistant usage (excluding subagents)
-            if ((message.message as any).usage && message.parent_tool_use_id === null) {
-              const messageWithUsage = message.message as unknown as SDKResultMessage;
-              lastAssistantTotalUsage =
-                messageWithUsage.usage.input_tokens +
-                messageWithUsage.usage.output_tokens +
-                messageWithUsage.usage.cache_read_input_tokens +
-                messageWithUsage.usage.cache_creation_input_tokens;
+            // Snapshot the latest top-level assistant usage and model so the
+            // next `result` can emit a usage_update tied to the right context
+            // window. Subagent messages are excluded to keep the snapshot
+            // aligned with what the user's current selection is producing.
+            if (message.type === "assistant" && message.parent_tool_use_id === null) {
+              lastAssistantUsage = snapshotFromUsage(message.message.usage);
+              lastAssistantTotalUsage = totalTokens(lastAssistantUsage);
+              if (message.message.model && message.message.model !== "<synthetic>") {
+                lastAssistantModel = message.message.model;
+              }
             }
 
             // Slash commands like /compact can generate invalid output... doesn't match
@@ -836,7 +1027,7 @@ export class ClaudeAcpAgent implements Agent {
   async cancel(params: CancelNotification): Promise<void> {
     const session = this.sessions[params.sessionId];
     if (!session) {
-      throw new Error("Session not found");
+      return;
     }
     session.cancelled = true;
     for (const [, pending] of session.pendingMessages) {
@@ -846,17 +1037,30 @@ export class ClaudeAcpAgent implements Agent {
     await session.query.interrupt();
   }
 
-  async unstable_closeSession(params: CloseSessionRequest): Promise<CloseSessionResponse> {
-    const session = this.sessions[params.sessionId];
+  /** Cleanly tear down a session: cancel in-flight work, dispose resources,
+   *  and remove it from the session map. */
+  private async teardownSession(sessionId: string): Promise<void> {
+    const session = this.sessions[sessionId];
     if (!session) {
-      throw new Error("Session not found");
+      return;
     }
-    await this.cancel({ sessionId: params.sessionId });
-
+    await this.cancel({ sessionId });
     session.settingsManager.dispose();
     session.abortController.abort();
-    delete this.sessions[params.sessionId];
+    session.query.close();
+    delete this.sessions[sessionId];
+  }
 
+  /** Tear down all active sessions. Called when the ACP connection closes. */
+  async dispose(): Promise<void> {
+    await Promise.all(Object.keys(this.sessions).map((id) => this.teardownSession(id)));
+  }
+
+  async unstable_closeSession(params: CloseSessionRequest): Promise<CloseSessionResponse> {
+    if (!this.sessions[params.sessionId]) {
+      throw new Error("Session not found");
+    }
+    await this.teardownSession(params.sessionId);
     return {};
   }
 
@@ -951,6 +1155,7 @@ export class ClaudeAcpAgent implements Agent {
 
   private async applySessionMode(sessionId: string, modeId: string): Promise<void> {
     switch (modeId) {
+      case "auto":
       case "default":
       case "acceptEdits":
       case "bypassPermissions":
@@ -1023,6 +1228,7 @@ export class ClaudeAcpAgent implements Agent {
 
       if (toolName === "ExitPlanMode") {
         const options = [
+          { kind: "allow_always", name: 'Yes, and use "auto" mode', optionId: "auto" },
           {
             kind: "allow_always",
             name: "Yes, and auto-accept edits",
@@ -1060,6 +1266,7 @@ export class ClaudeAcpAgent implements Agent {
           response.outcome?.outcome === "selected" &&
           (response.outcome.optionId === "default" ||
             response.outcome.optionId === "acceptEdits" ||
+            response.outcome.optionId === "auto" ||
             response.outcome.optionId === "bypassPermissions")
         ) {
           await this.client.sessionUpdate({
@@ -1192,6 +1399,13 @@ export class ClaudeAcpAgent implements Agent {
     if (configId === "mode") {
       session.modes = { ...session.modes, currentModeId: value };
     } else if (configId === "model") {
+      if (session.models.currentModelId !== value) {
+        // The cached context window was learned for the previous model; reset
+        // to the new model's heuristic so mid-stream updates between now and
+        // the next `result` reflect the user's selection instead of the old
+        // model's window.
+        session.contextWindowSize = inferContextWindowFromModel(value) ?? DEFAULT_CONTEXT_WINDOW;
+      }
       session.models = { ...session.models, currentModelId: value };
     }
   }
@@ -1204,12 +1418,20 @@ export class ClaudeAcpAgent implements Agent {
   }): Promise<NewSessionResponse> {
     const existingSession = this.sessions[params.sessionId];
     if (existingSession) {
-      return {
-        sessionId: params.sessionId,
-        modes: existingSession.modes,
-        models: existingSession.models,
-        configOptions: existingSession.configOptions,
-      };
+      const fingerprint = computeSessionFingerprint(params);
+      if (fingerprint === existingSession.sessionFingerprint) {
+        return {
+          sessionId: params.sessionId,
+          modes: existingSession.modes,
+          models: existingSession.models,
+          configOptions: existingSession.configOptions,
+        };
+      }
+
+      // Session-defining params changed (e.g. cwd pointed at a git worktree,
+      // or MCP servers reconfigured). Tear down the existing session and
+      // recreate it so the underlying Query process picks up the new values.
+      await this.teardownSession(params.sessionId);
     }
 
     const response = await this.createSession(
@@ -1407,7 +1629,8 @@ export class ClaudeAcpAgent implements Agent {
       if (
         creationOpts.resume &&
         error instanceof Error &&
-        error.message === "Query closed before response received"
+        (error.message === "Query closed before response received" ||
+          error.message.includes("No conversation found with session ID"))
       ) {
         throw RequestError.resourceNotFound(sessionId);
       }
@@ -1428,6 +1651,11 @@ export class ClaudeAcpAgent implements Agent {
     const models = await getAvailableModels(q, initializationResult.models, settingsManager);
 
     const availableModes = [
+      {
+        id: "auto",
+        name: "Auto",
+        description: "Use a model classifier to approve/deny permission prompts",
+      },
       {
         id: "default",
         name: "Default",
@@ -1470,6 +1698,7 @@ export class ClaudeAcpAgent implements Agent {
       input: input,
       cancelled: false,
       cwd: params.cwd,
+      sessionFingerprint: computeSessionFingerprint(params),
       settingsManager,
       accumulatedUsage: {
         inputTokens: 0,
@@ -1484,6 +1713,9 @@ export class ClaudeAcpAgent implements Agent {
       pendingMessages: new Map(),
       nextPendingOrder: 0,
       abortController,
+      emitRawSDKMessages: sessionMeta?.claudeCode?.emitRawSDKMessages ?? false,
+      contextWindowSize:
+        inferContextWindowFromModel(models.currentModelId) ?? DEFAULT_CONTEXT_WINDOW,
     };
 
     return {
@@ -1495,6 +1727,17 @@ export class ClaudeAcpAgent implements Agent {
   }
 }
 
+function shouldEmitRawMessage(
+  config: boolean | SDKMessageFilter[],
+  message: { type: string; subtype?: string },
+): boolean {
+  if (config === true) return true;
+  if (config === false) return false;
+  return config.some(
+    (f) => f.type === message.type && (f.subtype === undefined || f.subtype === message.subtype),
+  );
+}
+
 function sessionUsage(session: Session) {
   return {
     inputTokens: session.accumulatedUsage.inputTokens,
@@ -1509,6 +1752,41 @@ function sessionUsage(session: Session) {
   };
 }
 
+/** Sum all four fields as a proxy for post-turn context occupancy: the current
+ *  turn's output becomes next turn's input. Per the Anthropic API, input_tokens
+ *  excludes cache tokens — cache_read and cache_creation are reported
+ *  separately — so summing all four is not double-counting. */
+function totalTokens(usage: UsageSnapshot): number {
+  return (
+    usage.input_tokens +
+    usage.output_tokens +
+    usage.cache_read_input_tokens +
+    usage.cache_creation_input_tokens
+  );
+}
+
+/** Project a nullable API usage object into our non-null snapshot shape.
+ *  Both SDK message_start and assistant message `usage` have `number | null`
+ *  cache fields; we coerce absent values to 0 so `totalTokens` never hits
+ *  NaN. `input_tokens`/`output_tokens` are typed `number` by the SDK but
+ *  synthetic or third-party-backend stream events have been observed emitting
+ *  them as null/undefined — coerce those too so a malformed upstream event
+ *  can't leak NaN into the wire `used` field. Delta events have different
+ *  semantics (cumulative + prev fallback) and are handled inline. */
+function snapshotFromUsage(usage: {
+  input_tokens?: number | null;
+  output_tokens?: number | null;
+  cache_read_input_tokens?: number | null;
+  cache_creation_input_tokens?: number | null;
+}): UsageSnapshot {
+  return {
+    input_tokens: usage.input_tokens ?? 0,
+    output_tokens: usage.output_tokens ?? 0,
+    cache_read_input_tokens: usage.cache_read_input_tokens ?? 0,
+    cache_creation_input_tokens: usage.cache_creation_input_tokens ?? 0,
+  };
+}
+
 function createEnvForGateway(gatewayMeta?: GatewayAuthMeta) {
   if (!gatewayMeta) {
     return {};
@@ -1638,7 +1916,16 @@ async function getAvailableModels(
 
   let currentModel = models[0];
 
-  if (settings.model) {
+  // Model priority (highest to lowest):
+  // 1. ANTHROPIC_MODEL environment variable
+  // 2. settings.model (user configuration)
+  // 3. models[0] (default first model)
+  if (process.env.ANTHROPIC_MODEL) {
+    const match = resolveModelPreference(models, process.env.ANTHROPIC_MODEL);
+    if (match) {
+      currentModel = match;
+    }
+  } else if (settings.model) {
     const match = resolveModelPreference(models, settings.model);
     if (match) {
       currentModel = match;
@@ -1870,8 +2157,8 @@ export function toAcpNotifications(
         const alreadyCached = chunk.id in toolUseCache;
         toolUseCache[chunk.id] = chunk;
         if (chunk.name === "TodoWrite") {
-          // @ts-expect-error - sometimes input is empty object
-          if (Array.isArray(chunk.input.todos)) {
+          // @ts-expect-error - sometimes input is empty object or undefined
+          if (Array.isArray(chunk.input?.todos)) {
             update = {
               sessionUpdate: "plan",
               entries: planEntries(chunk.input as { todos: ClaudePlanEntry[] }),
@@ -2025,6 +2312,7 @@ export function toAcpNotifications(
       case "container_upload":
       case "compaction":
       case "compaction_delta":
+      case "advisor_tool_result":
         break;
 
       default:
@@ -2107,5 +2395,45 @@ export function runAcp() {
   const output = nodeToWebReadable(process.stdin);
 
   const stream = ndJsonStream(input, output);
-  new AgentSideConnection((client) => new ClaudeAcpAgent(client), stream);
+  let agent!: ClaudeAcpAgent;
+  const connection = new AgentSideConnection((client) => {
+    agent = new ClaudeAcpAgent(client);
+    return agent;
+  }, stream);
+  return { connection, agent };
+}
+
+function commonPrefixLength(a: string, b: string) {
+  let i = 0;
+  while (i < a.length && i < b.length && a[i] === b[i]) {
+    i++;
+  }
+  return i;
+}
+
+/** Best-effort first guess of a model's context window from its ID, used only
+ *  until a `result` message arrives with the authoritative `modelUsage` value.
+ *  Anthropic 1M-context variants encode "1m" as a distinct token in the SDK
+ *  model ID (e.g., "claude-opus-4-6-1m"), which `\b1m\b` catches without also
+ *  matching things like "10m" or embedded substrings. */
+function inferContextWindowFromModel(model: string): number | null {
+  if (/\b1m\b/i.test(model)) return 1_000_000;
+  return null;
+}
+
+function getMatchingModelUsage(modelUsage: Record<string, ModelUsage>, currentModel: string) {
+  let bestKey: string | null = null;
+  let bestLen = 0;
+
+  for (const key of Object.keys(modelUsage)) {
+    const len = commonPrefixLength(key, currentModel);
+    if (len > bestLen) {
+      bestLen = len;
+      bestKey = key;
+    }
+  }
+
+  if (bestKey) {
+    return modelUsage[bestKey];
+  }
 }

src/index.ts

@@ -24,8 +24,23 @@ if (process.argv.includes("--cli")) {
     console.error("Unhandled Rejection at:", promise, "reason:", reason);
   });
 
-  runAcp();
+  const { connection, agent } = runAcp();
 
-  // Keep process alive
+  async function shutdown() {
+    await agent.dispose().catch((err) => {
+      console.error("Error during cleanup:", err);
+    });
+    process.exit(0);
+  }
+
+  // Exit cleanly when the ACP connection closes (e.g. stdin EOF, transport
+  // error). Without this, `process.stdin.resume()` keeps the event loop
+  // alive indefinitely, causing orphan process accumulation in oneshot mode.
+  connection.closed.then(shutdown);
+
+  process.on("SIGTERM", shutdown);
+  process.on("SIGINT", shutdown);
+
+  // Keep process alive while connection is open
   process.stdin.resume();
 }

src/lib.ts

@@ -6,6 +6,7 @@ export {
   streamEventToAcpNotifications,
   type ToolUpdateMeta,
   type NewSessionMeta,
+  type SDKMessageFilter,
 } from "./acp-agent.js";
 export {
   loadManagedSettings,

src/settings.ts

@@ -25,9 +25,14 @@ export interface ClaudeCodeSettings {
 }
 
 /**
- * Reads and parses a JSON settings file, returning an empty object if not found or invalid
+ * Reads and parses a JSON settings file, returning an empty object if not found or invalid.
+ * Silently ignores missing files (ENOENT) but logs warnings for other errors
+ * (malformed JSON, permission errors, etc.) to aid debugging.
  */
-async function loadSettingsFile(filePath: string | null): Promise<ClaudeCodeSettings> {
+async function loadSettingsFile(
+  filePath: string | null,
+  logger?: { error: (...args: any[]) => void },
+): Promise<ClaudeCodeSettings> {
   if (!filePath) {
     return {};
   }
@@ -35,7 +40,11 @@ async function loadSettingsFile(filePath: string | null): Promise<ClaudeCodeSett
   try {
     const content = await fs.promises.readFile(filePath, "utf-8");
     return JSON.parse(content) as ClaudeCodeSettings;
-  } catch {
+  } catch (error) {
+    if (error instanceof Error && "code" in error && error.code === "ENOENT") {
+      return {};
+    }
+    logger?.error(`Failed to load settings from ${filePath}:`, error);
     return {};
   }
 }
@@ -83,7 +92,9 @@ export class SettingsManager {
   private onChange?: () => void;
   private logger: { log: (...args: any[]) => void; error: (...args: any[]) => void };
   private initialized = false;
+  private disposed = false;
   private debounceTimer: ReturnType<typeof setTimeout> | null = null;
+  private initPromise: Promise<void> | null = null;
 
   constructor(cwd: string, options?: SettingsManagerOptions) {
     this.cwd = cwd;
@@ -98,10 +109,19 @@ export class SettingsManager {
     if (this.initialized) {
       return;
     }
+    if (this.initPromise) {
+      return this.initPromise;
+    }
 
-    await this.loadAllSettings();
-    this.setupWatchers();
-    this.initialized = true;
+    this.disposed = false;
+    this.initPromise = this.loadAllSettings().then(() => {
+      if (!this.disposed) {
+        this.setupWatchers();
+        this.initialized = true;
+      }
+      this.initPromise = null;
+    });
+    return this.initPromise;
   }
 
   /**
@@ -130,10 +150,10 @@ export class SettingsManager {
    */
   private async loadAllSettings(): Promise<void> {
     const [userSettings, projectSettings, localSettings, enterpriseSettings] = await Promise.all([
-      loadSettingsFile(this.getUserSettingsPath()),
-      loadSettingsFile(this.getProjectSettingsPath()),
-      loadSettingsFile(this.getLocalSettingsPath()),
-      loadSettingsFile(getManagedSettingsPath()),
+      loadSettingsFile(this.getUserSettingsPath(), this.logger),
+      loadSettingsFile(this.getProjectSettingsPath(), this.logger),
+      loadSettingsFile(this.getLocalSettingsPath(), this.logger),
+      loadSettingsFile(getManagedSettingsPath(), this.logger),
     ]);
 
     this.userSettings = userSettings;
@@ -226,9 +246,14 @@ export class SettingsManager {
 
     this.debounceTimer = setTimeout(async () => {
       this.debounceTimer = null;
+      if (this.disposed) {
+        return;
+      }
       try {
         await this.loadAllSettings();
-        this.onChange?.();
+        if (!this.disposed) {
+          this.onChange?.();
+        }
       } catch (error) {
         this.logger.error("Failed to reload settings:", error);
       }
@@ -259,7 +284,6 @@ export class SettingsManager {
 
     this.dispose();
     this.cwd = cwd;
-    this.initialized = false;
     await this.initialize();
   }
 
@@ -267,6 +291,10 @@ export class SettingsManager {
    * Disposes of file watchers and cleans up resources
    */
   dispose(): void {
+    this.disposed = true;
+    this.initialized = false;
+    this.initPromise = null;
+
     if (this.debounceTimer) {
       clearTimeout(this.debounceTimer);
       this.debounceTimer = null;
@@ -276,6 +304,5 @@ export class SettingsManager {
       watcher.close();
     }
     this.watchers = [];
-    this.initialized = false;
   }
 }

src/tests/authorization.test.ts

@@ -123,14 +123,17 @@ describe("authorization", () => {
       } as any,
     });
     expect(initializeResponse.authMethods).not.toContainEqual(
-      expect.objectContaining({ id: "claude-login" }),
+      expect.objectContaining({ id: "claude-ai-login" }),
+    );
+    expect(initializeResponse.authMethods).not.toContainEqual(
+      expect.objectContaining({ id: "console-login" }),
     );
     expect(initializeResponse.authMethods).toContainEqual(
       expect.objectContaining({ id: "gateway" }),
     );
   });
 
-  it("hide terminal auth even when terminal-auth is set", async () => {
+  it("hide claude auth but still show console login when terminal-auth is set", async () => {
     const [agent] = await createAgentMock();
     vi.stubGlobal("process", { ...process, argv: ["--hide-claude-auth"] });
 
@@ -140,7 +143,88 @@ describe("authorization", () => {
         _meta: { "terminal-auth": true },
       },
     });
-    expect(initializeResponse.authMethods).toStrictEqual([]);
+    expect(initializeResponse.authMethods).not.toContainEqual(
+      expect.objectContaining({ id: "claude-ai-login" }),
+    );
+    expect(initializeResponse.authMethods).toContainEqual(
+      expect.objectContaining({ id: "console-login" }),
+    );
+  });
+
+  it("hide claude auth but still show console login with terminal capability", async () => {
+    const [agent] = await createAgentMock();
+    vi.stubGlobal("process", { ...process, argv: ["--hide-claude-auth"] });
+
+    const initializeResponse = await agent.initialize({
+      protocolVersion: 1,
+      clientCapabilities: {
+        auth: { terminal: true },
+      },
+    });
+    expect(initializeResponse.authMethods).not.toContainEqual(
+      expect.objectContaining({ id: "claude-ai-login" }),
+    );
+    expect(initializeResponse.authMethods).toContainEqual(
+      expect.objectContaining({ id: "console-login" }),
+    );
+  });
+
+  it("SSH session falls back to single legacy login method", async () => {
+    const [agent] = await createAgentMock();
+    vi.stubGlobal("process", { ...process, env: { ...process.env, SSH_TTY: "/dev/pts/0" } });
+
+    const initializeResponse = await agent.initialize({
+      protocolVersion: 1,
+      clientCapabilities: { auth: { terminal: true } },
+    });
+
+    expect(initializeResponse.authMethods).toContainEqual(
+      expect.objectContaining({ id: "claude-login" }),
+    );
+    expect(initializeResponse.authMethods).not.toContainEqual(
+      expect.objectContaining({ id: "claude-ai-login" }),
+    );
+    expect(initializeResponse.authMethods).not.toContainEqual(
+      expect.objectContaining({ id: "console-login" }),
+    );
+  });
+
+  it("CLAUDE_CODE_REMOTE falls back to single legacy login method", async () => {
+    const [agent] = await createAgentMock();
+    vi.stubGlobal("process", { ...process, env: { ...process.env, CLAUDE_CODE_REMOTE: "1" } });
+
+    const initializeResponse = await agent.initialize({
+      protocolVersion: 1,
+      clientCapabilities: { auth: { terminal: true } },
+    });
+
+    expect(initializeResponse.authMethods).toContainEqual(
+      expect.objectContaining({ id: "claude-login" }),
+    );
+    expect(initializeResponse.authMethods).not.toContainEqual(
+      expect.objectContaining({ id: "claude-ai-login" }),
+    );
+    expect(initializeResponse.authMethods).not.toContainEqual(
+      expect.objectContaining({ id: "console-login" }),
+    );
+  });
+
+  it("remote environment respects hide-claude-auth", async () => {
+    const [agent] = await createAgentMock();
+    vi.stubGlobal("process", {
+      ...process,
+      argv: ["--hide-claude-auth"],
+      env: { ...process.env, SSH_CONNECTION: "192.168.1.1 12345 192.168.1.2 22" },
+    });
+
+    const initializeResponse = await agent.initialize({
+      protocolVersion: 1,
+      clientCapabilities: { auth: { terminal: true } },
+    });
+
+    expect(initializeResponse.authMethods).not.toContainEqual(
+      expect.objectContaining({ id: "claude-login" }),
+    );
   });
 
   it("show claude authentication", async () => {
@@ -152,7 +236,10 @@ describe("authorization", () => {
     });
 
     expect(initializeResponse.authMethods).toContainEqual(
-      expect.objectContaining({ id: "claude-login" }),
+      expect.objectContaining({ id: "claude-ai-login" }),
+    );
+    expect(initializeResponse.authMethods).toContainEqual(
+      expect.objectContaining({ id: "console-login" }),
     );
   });
 });

src/tests/session-config-options.test.ts

@@ -93,7 +93,10 @@ describe("session config options", () => {
       cancelled: false,
       permissionMode: "default",
       settingsManager: {},
+      modes: structuredClone(MOCK_MODES),
+      models: structuredClone(MOCK_MODELS),
       configOptions: structuredClone(MOCK_CONFIG_OPTIONS),
+      contextWindowSize: 200000,
     };
   }
 

src/tests/session-load.test.ts

@@ -0,0 +1,148 @@
+import { describe, it, expect } from "vitest";
+import { randomUUID } from "crypto";
+import { AgentSideConnection, RequestError, SessionNotification } from "@agentclientprotocol/sdk";
+import { query, getSessionMessages } from "@anthropic-ai/claude-agent-sdk";
+import { ClaudeAcpAgent } from "../acp-agent.js";
+import { Pushable } from "../utils.js";
+import type { SDKUserMessage } from "@anthropic-ai/claude-agent-sdk";
+
+function createMockClient(): AgentSideConnection {
+  return {
+    sessionUpdate: async (_notification: SessionNotification) => {},
+    requestPermission: async () => ({ outcome: { outcome: "cancelled" } }),
+    readTextFile: async () => ({ content: "" }),
+    writeTextFile: async () => ({}),
+  } as unknown as AgentSideConnection;
+}
+
+describe.skipIf(!process.env.RUN_INTEGRATION_TESTS)("session load/resume lifecycle", () => {
+  it("SDK: session created but never prompted has no messages and is not resumable", async () => {
+    // Create a session via the SDK, initialize it, but never send a prompt
+    const sessionId = randomUUID();
+    const input = new Pushable<SDKUserMessage>();
+
+    const q = query({
+      prompt: input,
+      options: {
+        systemPrompt: { type: "preset", preset: "claude_code" },
+        sessionId,
+        settingSources: ["user", "project", "local"],
+        includePartialMessages: true,
+      },
+    });
+
+    // initializationResult() works without needing a prompt pushed
+    const initResult = await q.initializationResult();
+    expect(initResult).toBeDefined();
+
+    // Close without ever prompting
+    input.end();
+    q.return(undefined);
+
+    // Verify no messages were stored
+    const messages = await getSessionMessages(sessionId);
+    expect(messages).toEqual([]);
+
+    // Verify the session is not resumable
+    const input2 = new Pushable<SDKUserMessage>();
+    const q2 = query({
+      prompt: input2,
+      options: {
+        systemPrompt: { type: "preset", preset: "claude_code" },
+        resume: sessionId,
+        settingSources: ["user", "project", "local"],
+        includePartialMessages: true,
+      },
+    });
+
+    await expect(q2.initializationResult()).rejects.toThrow(
+      /No conversation found with session ID/,
+    );
+
+    input2.end();
+    q2.return(undefined);
+  }, 30000);
+
+  it("ACP: loadSession throws resourceNotFound for a non-existent session", async () => {
+    const agent = new ClaudeAcpAgent(createMockClient());
+    const bogusSessionId = randomUUID();
+
+    try {
+      await expect(
+        agent.loadSession({
+          sessionId: bogusSessionId,
+          cwd: process.cwd(),
+          mcpServers: [],
+        }),
+      ).rejects.toThrow(RequestError);
+    } finally {
+      await agent.dispose();
+    }
+  }, 30000);
+
+  it("ACP: resumeSession throws resourceNotFound for a non-existent session", async () => {
+    const agent = new ClaudeAcpAgent(createMockClient());
+    const bogusSessionId = randomUUID();
+
+    try {
+      await expect(
+        agent.unstable_resumeSession({
+          sessionId: bogusSessionId,
+          cwd: process.cwd(),
+          mcpServers: [],
+        }),
+      ).rejects.toThrow(RequestError);
+    } finally {
+      await agent.dispose();
+    }
+  }, 30000);
+
+  it("ACP: newSession without prompt, then loadSession on fresh agent throws resourceNotFound", async () => {
+    // Step 1: Create a real session via ACP, never prompt, dispose
+    const agentA = new ClaudeAcpAgent(createMockClient());
+    const { sessionId } = await agentA.newSession({
+      cwd: process.cwd(),
+      mcpServers: [],
+    });
+    expect(sessionId).toBeDefined();
+    await agentA.dispose();
+
+    // Step 2: Fresh agent tries to load that session
+    const agentB = new ClaudeAcpAgent(createMockClient());
+
+    try {
+      await expect(
+        agentB.loadSession({
+          sessionId,
+          cwd: process.cwd(),
+          mcpServers: [],
+        }),
+      ).rejects.toThrow(RequestError);
+    } finally {
+      await agentB.dispose();
+    }
+  }, 30000);
+
+  it("ACP: newSession without prompt, then resumeSession on fresh agent throws resourceNotFound", async () => {
+    const agentA = new ClaudeAcpAgent(createMockClient());
+    const { sessionId } = await agentA.newSession({
+      cwd: process.cwd(),
+      mcpServers: [],
+    });
+    await agentA.dispose();
+
+    const agentB = new ClaudeAcpAgent(createMockClient());
+
+    try {
+      await expect(
+        agentB.unstable_resumeSession({
+          sessionId,
+          cwd: process.cwd(),
+          mcpServers: [],
+        }),
+      ).rejects.toThrow(RequestError);
+    } finally {
+      await agentB.dispose();
+    }
+  }, 30000);
+});

src/tests/tools.test.ts

@@ -11,7 +11,12 @@ import {
   BetaBashCodeExecutionToolResultBlockParam,
 } from "@anthropic-ai/sdk/resources/beta.mjs";
 import { toAcpNotifications, ToolUseCache, Logger } from "../acp-agent.js";
-import { toolUpdateFromToolResult, createPostToolUseHook, toolInfoFromToolUse } from "../tools.js";
+import {
+  toolUpdateFromToolResult,
+  createPostToolUseHook,
+  toolInfoFromToolUse,
+  planEntries,
+} from "../tools.js";
 
 describe("rawOutput in tool call updates", () => {
   const mockClient = {} as AgentSideConnection;
@@ -1271,3 +1276,112 @@ describe("toolInfoFromToolUse - ExitPlanMode", () => {
     expect(info.content).toEqual([]);
   });
 });
+
+describe("toolInfoFromToolUse - undefined input regression", () => {
+  it("Read with undefined input should not throw", () => {
+    const toolUse = { name: "Read", id: "toolu_read_undef", input: undefined };
+    const info = toolInfoFromToolUse(toolUse, false);
+    expect(info.title).toBe("Read File");
+    expect(info.locations).toEqual([]);
+  });
+
+  it("Grep with undefined input should not throw", () => {
+    const toolUse = { name: "Grep", id: "toolu_grep_undef", input: undefined };
+    const info = toolInfoFromToolUse(toolUse, false);
+    expect(info.title).toBe("grep");
+  });
+
+  it("Glob with undefined input should not throw", () => {
+    const toolUse = { name: "Glob", id: "toolu_glob_undef", input: undefined };
+    const info = toolInfoFromToolUse(toolUse, false);
+    expect(info.title).toBe("Find");
+    expect(info.locations).toEqual([]);
+  });
+
+  it("WebSearch with undefined input should not throw", () => {
+    const toolUse = { name: "WebSearch", id: "toolu_ws_undef", input: undefined };
+    const info = toolInfoFromToolUse(toolUse, false);
+    expect(info.title).toBe("Web search");
+  });
+
+  it("TodoWrite with undefined input should not throw", () => {
+    const toolUse = { name: "TodoWrite", id: "toolu_todo_undef", input: undefined };
+    const info = toolInfoFromToolUse(toolUse, false);
+    expect(info.title).toBe("Update TODOs");
+  });
+});
+
+describe("planEntries - undefined input regression", () => {
+  it("should return empty array when input is undefined", () => {
+    expect(planEntries(undefined)).toEqual([]);
+  });
+
+  it("should return empty array when input has no todos", () => {
+    expect(planEntries({} as any)).toEqual([]);
+  });
+
+  it("should still map valid todos correctly", () => {
+    const result = planEntries({
+      todos: [
+        { content: "Task 1", status: "pending", activeForm: "" },
+        { content: "Task 2", status: "completed", activeForm: "" },
+      ],
+    });
+    expect(result).toEqual([
+      { content: "Task 1", status: "pending", priority: "medium" },
+      { content: "Task 2", status: "completed", priority: "medium" },
+    ]);
+  });
+});
+
+describe("toAcpNotifications - TodoWrite with undefined input regression", () => {
+  const mockClient = {} as AgentSideConnection;
+  const mockLogger: Logger = { log: () => {}, error: () => {} };
+
+  it("should not throw when TodoWrite tool_use has undefined input", () => {
+    const toolUseCache: ToolUseCache = {};
+
+    const notifications = toAcpNotifications(
+      [
+        {
+          type: "tool_use" as const,
+          id: "toolu_todo_undef",
+          name: "TodoWrite",
+          input: undefined as any,
+        },
+      ],
+      "assistant",
+      "test-session",
+      toolUseCache,
+      mockClient,
+      mockLogger,
+    );
+
+    // TodoWrite with undefined input should not crash, and should not emit plan update
+    const planUpdates = notifications.filter((n) => (n.update as any).sessionUpdate === "plan");
+    expect(planUpdates).toHaveLength(0);
+  });
+
+  it("should still emit plan update when TodoWrite has valid input", () => {
+    const toolUseCache: ToolUseCache = {};
+
+    const notifications = toAcpNotifications(
+      [
+        {
+          type: "tool_use" as const,
+          id: "toolu_todo_valid",
+          name: "TodoWrite",
+          input: { todos: [{ content: "Do X", status: "pending" }] },
+        },
+      ],
+      "assistant",
+      "test-session",
+      toolUseCache,
+      mockClient,
+      mockLogger,
+    );
+
+    const planUpdates = notifications.filter((n) => (n.update as any).sessionUpdate === "plan");
+    expect(planUpdates).toHaveLength(1);
+  });
+});

src/tools.ts

@@ -128,7 +128,7 @@ export function toolInfoFromToolUse(
   switch (name) {
     case "Agent":
     case "Task": {
-      const input = toolUse.input as AgentInput | BashInput;
+      const input = toolUse.input as AgentInput | BashInput | undefined;
       return {
         title: input?.description ? input.description : "Task",
         kind: "think",
@@ -145,7 +145,7 @@ export function toolInfoFromToolUse(
     }
 
     case "Bash": {
-      const input = toolUse.input as BashInput;
+      const input = toolUse.input as BashInput | undefined;
       return {
         title: input?.command ? input.command : "Terminal",
         kind: "execute",
@@ -163,18 +163,18 @@ export function toolInfoFromToolUse(
     }
 
     case "Read": {
-      const input = toolUse.input as FileReadInput;
+      const input = toolUse.input as FileReadInput | undefined;
       let limit = "";
-      if (input.limit && input.limit > 0) {
+      if (input?.limit && input.limit > 0) {
         limit = " (" + (input.offset ?? 1) + " - " + ((input.offset ?? 1) + input.limit - 1) + ")";
-      } else if (input.offset) {
+      } else if (input?.offset) {
         limit = " (from line " + input.offset + ")";
       }
-      const displayPath = input.file_path ? toDisplayPath(input.file_path, cwd) : "File";
+      const displayPath = input?.file_path ? toDisplayPath(input.file_path, cwd) : "File";
       return {
         title: "Read " + displayPath + limit,
         kind: "read",
-        locations: input.file_path
+        locations: input?.file_path
           ? [
               {
                 path: input.file_path,
@@ -187,7 +187,7 @@ export function toolInfoFromToolUse(
     }
 
     case "Write": {
-      const input = toolUse.input as FileWriteInput;
+      const input = toolUse.input as FileWriteInput | undefined;
       let content: ToolCallContent[] = [];
       if (input && input.file_path) {
         content = [
@@ -216,7 +216,7 @@ export function toolInfoFromToolUse(
     }
 
     case "Edit": {
-      const input = toolUse.input as FileEditInput;
+      const input = toolUse.input as FileEditInput | undefined;
       let content: ToolCallContent[] = [];
       if (input && input.file_path && (input.old_string || input.new_string)) {
         content = [
@@ -238,44 +238,44 @@ export function toolInfoFromToolUse(
     }
 
     case "Glob": {
-      const input = toolUse.input as GlobInput;
+      const input = toolUse.input as GlobInput | undefined;
       let label = "Find";
-      if (input.path) {
+      if (input?.path) {
         label += ` \`${input.path}\``;
       }
-      if (input.pattern) {
+      if (input?.pattern) {
         label += ` \`${input.pattern}\``;
       }
       return {
         title: label,
         kind: "search",
         content: [],
-        locations: input.path ? [{ path: input.path }] : [],
+        locations: input?.path ? [{ path: input.path }] : [],
       };
     }
 
     case "Grep": {
-      const input = toolUse.input as GrepInput;
+      const input = toolUse.input as GrepInput | undefined;
       let label = "grep";
 
-      if (input["-i"]) {
+      if (input?.["-i"]) {
         label += " -i";
       }
-      if (input["-n"]) {
+      if (input?.["-n"]) {
         label += " -n";
       }
 
-      if (input["-A"] !== undefined) {
+      if (input?.["-A"] !== undefined) {
         label += ` -A ${input["-A"]}`;
       }
-      if (input["-B"] !== undefined) {
+      if (input?.["-B"] !== undefined) {
         label += ` -B ${input["-B"]}`;
       }
-      if (input["-C"] !== undefined) {
+      if (input?.["-C"] !== undefined) {
         label += ` -C ${input["-C"]}`;
       }
 
-      if (input.output_mode) {
+      if (input?.output_mode) {
         switch (input.output_mode) {
           case "files_with_matches":
             label += " -l";
@@ -289,27 +289,27 @@ export function toolInfoFromToolUse(
         }
       }
 
-      if (input.head_limit !== undefined) {
+      if (input?.head_limit !== undefined) {
         label += ` | head -${input.head_limit}`;
       }
 
-      if (input.glob) {
+      if (input?.glob) {
         label += ` --include="${input.glob}"`;
       }
 
-      if (input.type) {
+      if (input?.type) {
         label += ` --type=${input.type}`;
       }
 
-      if (input.multiline) {
+      if (input?.multiline) {
         label += " -P";
       }
 
-      if (input.pattern) {
+      if (input?.pattern) {
         label += ` "${input.pattern}"`;
       }
 
-      if (input.path) {
+      if (input?.path) {
         label += ` ${input.path}`;
       }
 
@@ -338,14 +338,14 @@ export function toolInfoFromToolUse(
     }
 
     case "WebSearch": {
-      const input = toolUse.input as WebSearchInput;
-      let label = `"${input.query}"`;
+      const input = toolUse.input as WebSearchInput | undefined;
+      let label = input?.query ? `"${input.query}"` : "Web search";
 
-      if (input.allowed_domains && input.allowed_domains.length > 0) {
+      if (input?.allowed_domains && input.allowed_domains.length > 0) {
         label += ` (allowed: ${input.allowed_domains.join(", ")})`;
       }
 
-      if (input.blocked_domains && input.blocked_domains.length > 0) {
+      if (input?.blocked_domains && input.blocked_domains.length > 0) {
         label += ` (blocked: ${input.blocked_domains.join(", ")})`;
       }
 
@@ -357,7 +357,7 @@ export function toolInfoFromToolUse(
     }
 
     case "TodoWrite": {
-      const input = toolUse.input as TodoWriteInput;
+      const input = toolUse.input as TodoWriteInput | undefined;
       return {
         title: Array.isArray(input?.todos)
           ? `Update TODOs: ${input.todos.map((todo: any) => todo.content).join(", ")}`
@@ -368,7 +368,7 @@ export function toolInfoFromToolUse(
     }
 
     case "ExitPlanMode": {
-      const planInput = toolUse.input as { plan?: string };
+      const planInput = toolUse.input as { plan?: string } | undefined;
       return {
         title: "Ready to code?",
         kind: "switch_mode",
@@ -661,10 +661,10 @@ export type ClaudePlanEntry = {
   activeForm: string;
 };
 
-export function planEntries(input: { todos: ClaudePlanEntry[] }): PlanEntry[] {
-  return input.todos.map((input) => ({
-    content: input.content,
-    status: input.status,
+export function planEntries(input: { todos: ClaudePlanEntry[] } | undefined): PlanEntry[] {
+  return (input?.todos ?? []).map((todo) => ({
+    content: todo.content,
+    status: todo.status,
     priority: "medium",
   }));
 }