chore(main): release 0.55.0 (#832 )

🤖 I have created a release *beep* *boop* --- ## [0.55.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.54.1...v0.55.0) (2026-07-02) ### Features * Add refusal fallback consent dialog support ([#834](https://github.com/agentclientprotocol/claude-agent-acp/issues/834)) ([15dfd83](15dfd83daa)) * **deps-dev:** bump the minor group with 3 updates ([#831](https://github.com/agentclientprotocol/claude-agent-acp/issues/831)) ([8d5febf](8d5febf854)) * Update to claude-agent-sdk 0.3.198 ([#836](https://github.com/agentclientprotocol/claude-agent-acp/issues/836)) ([307ab82](307ab82712)) ### Bug Fixes * Handle model refusal fallback updates ([#833](https://github.com/agentclientprotocol/claude-agent-acp/issues/833)) ([648e3f6](648e3f60bd)) * Handle SDK idle turns without results ([#835](https://github.com/agentclientprotocol/claude-agent-acp/issues/835)) ([57b00cc](57b00ccac6)) --- 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>
feat: Update to claude-agent-sdk 0.3.198 (#836 )
2026-11-04 16:31:56 +00:00 · 2026-07-02 13:16:28 +02:00 · 2026-07-02 10:42:48 +00:00 · 2026-07-02 12:41:21 +02:00 · 2026-07-02 10:14:50 +00:00 · 2026-07-02 09:21:49 +00:00
17 changed files with 2958 additions and 342 deletions
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.52.0"
+  ".": "0.55.0"
 }
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,50 @@
 # Changelog

+## [0.55.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.54.1...v0.55.0) (2026-07-02)
+
+
+### Features
+
+* Add refusal fallback consent dialog support ([#834](https://github.com/agentclientprotocol/claude-agent-acp/issues/834)) ([15dfd83](https://github.com/agentclientprotocol/claude-agent-acp/commit/15dfd83daa84ced98ecbaa7c83fd5a53124030c1))
+* **deps-dev:** bump the minor group with 3 updates ([#831](https://github.com/agentclientprotocol/claude-agent-acp/issues/831)) ([8d5febf](https://github.com/agentclientprotocol/claude-agent-acp/commit/8d5febf85485c1ad19b81501fb5c6d4275448a7c))
+* Update to claude-agent-sdk 0.3.198 ([#836](https://github.com/agentclientprotocol/claude-agent-acp/issues/836)) ([307ab82](https://github.com/agentclientprotocol/claude-agent-acp/commit/307ab82712213413446466d808e161073e94fc7f))
+
+
+### Bug Fixes
+
+* Handle model refusal fallback updates ([#833](https://github.com/agentclientprotocol/claude-agent-acp/issues/833)) ([648e3f6](https://github.com/agentclientprotocol/claude-agent-acp/commit/648e3f60bd7e6eadb5f86b0dc475104ab12e7b02))
+* Handle SDK idle turns without results ([#835](https://github.com/agentclientprotocol/claude-agent-acp/issues/835)) ([57b00cc](https://github.com/agentclientprotocol/claude-agent-acp/commit/57b00ccac610e2eeaf0a753934a0c3b78d27ccb0))
+
+## [0.54.1](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.54.0...v0.54.1) (2026-06-30)
+
+
+### Bug Fixes
+
+* apply modelOverrides when resolving availableModels allowlist ([#827](https://github.com/agentclientprotocol/claude-agent-acp/issues/827)) ([98c284b](https://github.com/agentclientprotocol/claude-agent-acp/commit/98c284bb871a96710596dfdc2b9ea25d2400f6b2))
+
+## [0.54.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.53.0...v0.54.0) (2026-06-30)
+
+
+### Features
+
+* Add Fast mode session config support ([#828](https://github.com/agentclientprotocol/claude-agent-acp/issues/828)) ([fa949a2](https://github.com/agentclientprotocol/claude-agent-acp/commit/fa949a20db0e33f2d63aebeb37e9fea212d8ee95))
+* **deps-dev:** bump prettier from 3.9.1 to 3.9.3 in the minor group ([#821](https://github.com/agentclientprotocol/claude-agent-acp/issues/821)) ([b8df8e0](https://github.com/agentclientprotocol/claude-agent-acp/commit/b8df8e0e5460fd782214f4dde488f7476c80c454))
+* **deps:** bump @anthropic-ai/claude-agent-sdk to 0.3.197 for Sonnet 5 ([#826](https://github.com/agentclientprotocol/claude-agent-acp/issues/826)) ([ef42c46](https://github.com/agentclientprotocol/claude-agent-acp/commit/ef42c46e5aea3bb53f433b9f9dd36a62a9f2df6a))
+* **deps:** bump fast-uri from 3.1.2 to 3.1.3 ([#822](https://github.com/agentclientprotocol/claude-agent-acp/issues/822)) ([64aa130](https://github.com/agentclientprotocol/claude-agent-acp/commit/64aa130c66c299f9835193796ba372b3ed40e7c1))
+
+## [0.53.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.52.0...v0.53.0) (2026-06-29)
+
+
+### Features
+
+* Add ACP logout support ([#816](https://github.com/agentclientprotocol/claude-agent-acp/issues/816)) ([0a0468c](https://github.com/agentclientprotocol/claude-agent-acp/commit/0a0468c72092b7ceccc551b4353dd92f9c22cbb8))
+* **deps:** bump @anthropic-ai/claude-agent-sdk to 0.3.195 ([#818](https://github.com/agentclientprotocol/claude-agent-acp/issues/818)) ([5dd8746](https://github.com/agentclientprotocol/claude-agent-acp/commit/5dd87462376597eb7b695200f4c716af46e764d6))
+
+
+### Bug Fixes
+
+* Emit tool_call before permission request ([#820](https://github.com/agentclientprotocol/claude-agent-acp/issues/820)) ([c95fc88](https://github.com/agentclientprotocol/claude-agent-acp/commit/c95fc884e82e5a297d1b17b8965690260867835b))
+
 ## [0.52.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.51.0...v0.52.0) (2026-06-25)


--- a/package-lock.json
+++ b/package-lock.json
@@ -1,32 +1,32 @@
 {
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-  "version": "0.52.0",
+  "version": "0.55.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
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      "license": "Apache-2.0",
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        "zod": "^3.25.0 || ^4.0.0"
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@@ -36,31 +36,31 @@
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      "license": "SEE LICENSE IN README.md",
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@@ -69,9 +69,9 @@
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+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-8.62.1.tgz",
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@@ -1094,16 +1094,16 @@
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-      "version": "8.62.0",
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+      "version": "8.62.1",
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      "dev": true,
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-        "@typescript-eslint/project-service": "8.62.0",
-        "@typescript-eslint/tsconfig-utils": "8.62.0",
-        "@typescript-eslint/types": "8.62.0",
-        "@typescript-eslint/visitor-keys": "8.62.0",
+        "@typescript-eslint/project-service": "8.62.1",
+        "@typescript-eslint/tsconfig-utils": "8.62.1",
+        "@typescript-eslint/types": "8.62.1",
+        "@typescript-eslint/visitor-keys": "8.62.1",
        "debug": "^4.4.3",
        "minimatch": "^10.2.2",
        "semver": "^7.7.3",
@@ -1122,16 +1122,16 @@
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-      "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-8.62.0.tgz",
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+      "version": "8.62.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-8.62.1.tgz",
+      "integrity": "sha512-sHtbPfuKNZCG+ih8SyjjucqRntSVmp8XgL5u6o9mAhiSn8ds5o/M/XdM0abweme2Tln3szOstOrZ9OXitvPh0g==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
        "@eslint-community/eslint-utils": "^4.9.1",
-        "@typescript-eslint/scope-manager": "8.62.0",
-        "@typescript-eslint/types": "8.62.0",
-        "@typescript-eslint/typescript-estree": "8.62.0"
+        "@typescript-eslint/scope-manager": "8.62.1",
+        "@typescript-eslint/types": "8.62.1",
+        "@typescript-eslint/typescript-estree": "8.62.1"
      },
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        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
@@ -1146,13 +1146,13 @@
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    "node_modules/@typescript-eslint/visitor-keys": {
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-      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-8.62.0.tgz",
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+      "version": "8.62.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-8.62.1.tgz",
+      "integrity": "sha512-4g3BLxfdTMy8iZG0MaBkadnlRrCJ74cQiFbyEVMrkwIoqdyaXXQM22cotDvrl4x28wgIZ9rEJRoM+mmhSJpJ1g==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
-        "@typescript-eslint/types": "8.62.0",
+        "@typescript-eslint/types": "8.62.1",
        "eslint-visitor-keys": "^5.0.0"
      },
      "engines": {
@@ -1441,9 +1441,9 @@
      }
    },
    "node_modules/brace-expansion": {
-      "version": "5.0.6",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.6.tgz",
-      "integrity": "sha512-kLpxurY4Z4r9sgMsyG0Z9uzsBlgiU/EFKhj/h91/8yHu0edo7XuixOIH3VcJ8kkxs6/jPzoI6U9Vj3WqbMQ94g==",
+      "version": "5.0.7",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.7.tgz",
+      "integrity": "sha512-7oFy703dxfY3/NLxC1fh2SUCQ0H9rmAY+5EpDVfXjUTTs+HEwR2nYaqLv+GWcTsumwxPfiz6CzCNkwXwBUwqCA==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
@@ -1701,9 +1701,9 @@
      }
    },
    "node_modules/es-module-lexer": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/es-module-lexer/-/es-module-lexer-2.1.0.tgz",
-      "integrity": "sha512-n27zTYMjYu1aj4MjCWzSP7G9r75utsaoc8m61weK+W8JMBGGQybd43GstCXZ3WNmSFtGT9wi59qQTW6mhTR5LQ==",
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/es-module-lexer/-/es-module-lexer-2.3.0.tgz",
+      "integrity": "sha512-KLdwQm2NvGLDkQDCGvmiQrhkd0JbMzXthwQAUgWjQuQdBLFa3eiBP5arXZyA+f8x+x7OXgud6bq2rxjGtHV2tw==",
      "dev": true,
      "license": "MIT"
    },
@@ -1741,9 +1741,9 @@
      }
    },
    "node_modules/eslint": {
-      "version": "10.5.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-10.5.0.tgz",
-      "integrity": "sha512-1y+7C+vi12bUK1IpZeaV3gsH9fHLBmPvYmPx42pvT/E9yG0IC8g3PUZZgp0+JLJl7ZDK0flc2gc+Aw9dpCvIsQ==",
+      "version": "10.6.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-10.6.0.tgz",
+      "integrity": "sha512-6lVbcqSodALYo+4ELD0heG6lFiFxnLMuLkiMi2qV8LMp54N8tE8FT1GMH+ev4Ti00nFjNze2+Su6DsV5OQW3Dg==",
      "dev": true,
      "license": "MIT",
      "workspaces": [
@@ -2114,9 +2114,9 @@
      "license": "Unlicense"
    },
    "node_modules/fast-uri": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/fast-uri/-/fast-uri-3.1.2.tgz",
-      "integrity": "sha512-rVjf7ArG3LTk+FS6Yw81V1DLuZl1bRbNrev6Tmd/9RaroeeRRJhAt7jg/6YFxbvAQXUCavSoZhPPj6oOx+5KjQ==",
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/fast-uri/-/fast-uri-3.1.3.tgz",
+      "integrity": "sha512-i70LwGWUduXqzicKXWshooq+sWL1K3WUU5rKZNG/0i3a1OSoX3HqhH5WbWwTmqWfor4urUakGPiRQcleRZTwOg==",
      "funding": [
        {
          "type": "github",
@@ -3188,9 +3188,9 @@
      }
    },
    "node_modules/postcss": {
-      "version": "8.5.15",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.15.tgz",
-      "integrity": "sha512-FfR8sjd4em2T6fb3I2MwAJU7HWVMr9zba+enmQeeWFfCbm+UOC/0X4DS8XtpUTMwWMGbjKYP7xjfNekzyGmB3A==",
+      "version": "8.5.16",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.16.tgz",
+      "integrity": "sha512-vuwillviilfKZsg0VGj5R/YwwcHx4SLsIOI/7K6mQkWx+l5cUHTjj5g0AasTBcyXsbfTgrwsUNmVUb5xVwyPwg==",
      "dev": true,
      "funding": [
        {
@@ -3227,9 +3227,9 @@
      }
    },
    "node_modules/prettier": {
-      "version": "3.8.4",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.8.4.tgz",
-      "integrity": "sha512-N2MylSdi48+5N/6S5j+maeHbUSIzzZ5uOcX5Hm4QpV8Dkb1HFjfAKTKX6yNPJQD9AhcT3ifHNB66tWTTJDi11Q==",
+      "version": "3.9.4",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.9.4.tgz",
+      "integrity": "sha512-yWG/o/4oJfo036EKAfK6ACAoDOfHeRHx4tuxkfBZiauURiaSmYwlpOr5LQqKtIkRD2z1PLteme2WoxEnj4tHTg==",
      "dev": true,
      "license": "MIT",
      "bin": {
@@ -3284,13 +3284,17 @@
      }
    },
    "node_modules/range-parser": {
-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
-      "integrity": "sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.3.0.tgz",
+      "integrity": "sha512-hek2mFQpPuI4E1BBKrSto+BU3e3x4xuarsbiwr3+lf7p44juvFMV0XFWQAP3xUyqXA4RrXLIoaSUGbSt056ZMw==",
      "license": "MIT",
      "peer": true,
      "engines": {
        "node": ">= 0.6"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
      }
    },
    "node_modules/raw-body": {
@@ -3320,13 +3324,13 @@
      }
    },
    "node_modules/rolldown": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/rolldown/-/rolldown-1.1.3.tgz",
-      "integrity": "sha512-1F1eEtUBtFvcGm1HQ9TiUIUHPQG7mSAODrhIzjxoUEFuo8OcbrGLiVLkevNgj84TE4lnHvnumwFjhJO5Eu135g==",
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/rolldown/-/rolldown-1.1.4.tgz",
+      "integrity": "sha512-IjZYiLxZwpnhwhdBH2ugdTGVSdhCQUmLxLoqyjiL0JxYjyRst+5a0P3xfrTxJ5F638j4Mvvw5FAX5XE6eHpXbA==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
-        "@oxc-project/types": "=0.137.0",
+        "@oxc-project/types": "=0.138.0",
        "@rolldown/pluginutils": "^1.0.0"
      },
      "bin": {
@@ -3336,21 +3340,21 @@
        "node": "^20.19.0 || >=22.12.0"
      },
      "optionalDependencies": {
-        "@rolldown/binding-android-arm64": "1.1.3",
-        "@rolldown/binding-darwin-arm64": "1.1.3",
-        "@rolldown/binding-darwin-x64": "1.1.3",
-        "@rolldown/binding-freebsd-x64": "1.1.3",
-        "@rolldown/binding-linux-arm-gnueabihf": "1.1.3",
-        "@rolldown/binding-linux-arm64-gnu": "1.1.3",
-        "@rolldown/binding-linux-arm64-musl": "1.1.3",
-        "@rolldown/binding-linux-ppc64-gnu": "1.1.3",
-        "@rolldown/binding-linux-s390x-gnu": "1.1.3",
-        "@rolldown/binding-linux-x64-gnu": "1.1.3",
-        "@rolldown/binding-linux-x64-musl": "1.1.3",
-        "@rolldown/binding-openharmony-arm64": "1.1.3",
-        "@rolldown/binding-wasm32-wasi": "1.1.3",
-        "@rolldown/binding-win32-arm64-msvc": "1.1.3",
-        "@rolldown/binding-win32-x64-msvc": "1.1.3"
+        "@rolldown/binding-android-arm64": "1.1.4",
+        "@rolldown/binding-darwin-arm64": "1.1.4",
+        "@rolldown/binding-darwin-x64": "1.1.4",
+        "@rolldown/binding-freebsd-x64": "1.1.4",
+        "@rolldown/binding-linux-arm-gnueabihf": "1.1.4",
+        "@rolldown/binding-linux-arm64-gnu": "1.1.4",
+        "@rolldown/binding-linux-arm64-musl": "1.1.4",
+        "@rolldown/binding-linux-ppc64-gnu": "1.1.4",
+        "@rolldown/binding-linux-s390x-gnu": "1.1.4",
+        "@rolldown/binding-linux-x64-gnu": "1.1.4",
+        "@rolldown/binding-linux-x64-musl": "1.1.4",
+        "@rolldown/binding-openharmony-arm64": "1.1.4",
+        "@rolldown/binding-wasm32-wasi": "1.1.4",
+        "@rolldown/binding-win32-arm64-msvc": "1.1.4",
+        "@rolldown/binding-win32-x64-msvc": "1.1.4"
      }
    },
    "node_modules/router": {
@@ -3822,16 +3826,16 @@
      }
    },
    "node_modules/vite": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/vite/-/vite-8.1.0.tgz",
-      "integrity": "sha512-BuJcQK/56NQTWDGn4ABea3q4SSBdNPWwNZKTkkUpcMPnLoquSYH8llRtSUIgoL1KSCpHt5eghLShn50mH36y7Q==",
+      "version": "8.1.3",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-8.1.3.tgz",
+      "integrity": "sha512-Ds+gBRbj0lwRO2Y5hwnUBdxSwlAve9LeRyU4sNnAr0ewW0gWF0n5bgXgUzbgZ49MV9BVUAQUFYVcDUcilUExMA==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
        "lightningcss": "^1.32.0",
        "picomatch": "^4.0.4",
-        "postcss": "^8.5.15",
-        "rolldown": "~1.1.2",
+        "postcss": "^8.5.16",
+        "rolldown": "~1.1.3",
        "tinyglobby": "^0.2.17"
      },
      "bin": {
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
  "publishConfig": {
    "access": "public"
  },
-  "version": "0.52.0",
+  "version": "0.55.0",
  "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": "1.0.0",
-    "@anthropic-ai/claude-agent-sdk": "0.3.191",
+    "@agentclientprotocol/sdk": "1.1.0",
+    "@anthropic-ai/claude-agent-sdk": "0.3.198",
    "zod": "^3.25.0 || ^4.0.0"
  },
  "devDependencies": {
-    "@anthropic-ai/sdk": "0.106.0",
+    "@anthropic-ai/sdk": "0.109.1",
    "@eslint/js": "10.0.1",
    "@tsconfig/node22": "22.0.5",
-    "@types/node": "26.0.1",
-    "@typescript-eslint/eslint-plugin": "8.62.0",
-    "@typescript-eslint/parser": "8.62.0",
-    "eslint": "10.5.0",
+    "@types/node": "26.1.0",
+    "@typescript-eslint/eslint-plugin": "8.62.1",
+    "@typescript-eslint/parser": "8.62.1",
+    "eslint": "10.6.0",
    "eslint-config-prettier": "10.1.8",
    "globals": "17.7.0",
-    "prettier": "3.8.4",
+    "prettier": "3.9.4",
    "ts-node": "10.9.2",
    "typescript": "6.0.3",
    "vitest": "4.1.9"
--- a/src/acp-agent.ts
+++ b/src/acp-agent.ts
--- a/src/elicitation.ts
+++ b/src/elicitation.ts
@@ -232,8 +232,7 @@ export function askUserQuestionsToCreateRequest(

 /** Outcome of an AskUserQuestion elicitation, decoupled from any transport. */
 export type AskUserQuestionOutcome =
-  | { action: "answered"; updatedInput: Record<string, unknown> }
-  | { action: "cancel" };
+  { action: "answered"; updatedInput: Record<string, unknown> } | { action: "cancel" };

 /**
 * Fold an ACP elicitation response into the AskUserQuestion tool's input.
@@ -299,3 +298,108 @@ function normalizeElicitationSchema(
  }
  return { ...(schema as ElicitationSchema), type: "object" };
 }
+
+/**
+ * The `request_user_dialog` kind the CLI emits when a model refusal has a
+ * fallback available but needs user consent before retrying (e.g. Claude Fable
+ * declining a request with Opus available as the fallback). Declaring this
+ * kind in `supportedDialogKinds` is the opt-in: the CLI fails closed and never
+ * emits an undeclared kind — the flow degrades to the classic refusal error
+ * ending the turn.
+ */
+export const REFUSAL_FALLBACK_DIALOG_KIND = "refusal_fallback_prompt";
+
+/**
+ * Payload of the `refusal_fallback_prompt` dialog. The dialog protocol
+ * transports payloads opaquely, so this shape is recovered from the CLI's own
+ * schema (v2.1.177): `originalModel`/`fallbackModel` are required strings;
+ * `apiRefusalCategory` (nullable), `guidanceText`, and
+ * `retractedMessageUuids` are optional. We ignore `retractedMessageUuids` —
+ * ACP has no way to retract already-streamed chunks.
+ */
+export type RefusalFallbackPrompt = {
+  originalModel: string;
+  fallbackModel: string;
+  apiRefusalCategory: string | null;
+  guidanceText?: string;
+};
+
+/**
+ * Validate the opaque dialog payload into a {@link RefusalFallbackPrompt}.
+ * Returns `null` when the required fields are missing or mistyped (a newer CLI
+ * may reshape the payload), so the caller can cancel the dialog and let the
+ * CLI apply its default behavior instead of rendering something misleading.
+ */
+export function extractRefusalFallbackPrompt(
+  payload: Record<string, unknown>,
+): RefusalFallbackPrompt | null {
+  const { originalModel, fallbackModel, apiRefusalCategory, guidanceText } = payload;
+  if (typeof originalModel !== "string" || typeof fallbackModel !== "string") {
+    return null;
+  }
+  return {
+    originalModel,
+    fallbackModel,
+    apiRefusalCategory: typeof apiRefusalCategory === "string" ? apiRefusalCategory : null,
+    ...(typeof guidanceText === "string" && guidanceText ? { guidanceText } : {}),
+  };
+}
+
+/** Form-field key carrying the user's choice in the refusal-fallback form. */
+const REFUSAL_FALLBACK_CHOICE_KEY = "choice";
+
+/** Wire values of the dialog's result enum (CLI schema). `edit_prompt` is
+ *  deliberately not offered: in the CLI it prefills the composer with the
+ *  refused prompt for edit-and-retry, and ACP has no composer-prefill surface
+ *  — the user can simply edit and resend on their own. */
+const RETRY_FALLBACK_RESULT = "retry_fallback";
+const KEEP_REFUSAL_RESULT = "cancelled";
+
+/**
+ * Render the refusal-fallback consent prompt as an ACP form elicitation: a
+ * single-select between retrying on the fallback model and keeping the
+ * refusal. The enum `const`s are the dialog's wire result values, so the
+ * response maps back without a translation table.
+ */
+export function refusalFallbackToCreateRequest(
+  prompt: RefusalFallbackPrompt,
+  sessionId: string,
+): CreateElicitationRequest {
+  const category = prompt.apiRefusalCategory ? ` (${prompt.apiRefusalCategory})` : "";
+  const guidance = prompt.guidanceText ? `\n\n${prompt.guidanceText}` : "";
+  return {
+    mode: "form",
+    sessionId,
+    message:
+      `${prompt.originalModel} declined this request${category}. ` +
+      `Retry with ${prompt.fallbackModel}? The session would continue on ${prompt.fallbackModel}.` +
+      guidance,
+    requestedSchema: {
+      type: "object",
+      properties: {
+        [REFUSAL_FALLBACK_CHOICE_KEY]: {
+          type: "string",
+          oneOf: [
+            { const: RETRY_FALLBACK_RESULT, title: `Retry with ${prompt.fallbackModel}` },
+            { const: KEEP_REFUSAL_RESULT, title: "Keep the refusal" },
+          ],
+        },
+      },
+    },
+  };
+}
+
+/**
+ * Map the elicitation response back to the dialog's result enum. Only an
+ * explicit accept-with-retry resolves to `retry_fallback`; decline, cancel, a
+ * skipped field, or an unrecognized value all keep the refusal — the dialog's
+ * own default — so a dismissed or half-filled form can never trigger a model
+ * switch the user didn't ask for.
+ */
+export function refusalFallbackResultFromResponse(response: CreateElicitationResponse): string {
+  if (response.action !== "accept") {
+    return KEEP_REFUSAL_RESULT;
+  }
+  const choice = response.content?.[REFUSAL_FALLBACK_CHOICE_KEY];
+  return choice === RETRY_FALLBACK_RESULT ? RETRY_FALLBACK_RESULT : KEEP_REFUSAL_RESULT;
+}
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,10 +4,10 @@ import { resolveSettings } from "@anthropic-ai/claude-agent-sdk";
 import { claudeCliPath, runAcp } from "./acp-agent.js";
 import packageJson from "../package.json" with { type: "json" };

-if (process.argv.includes("--version") || process.argv.includes("-v")) {
-  console.log(packageJson.version);
-  process.exit(0);
-} else if (process.argv.includes("--cli")) {
+// `--cli` is checked first so that `--version`/`-v` (and any other flags) are
+// forwarded to the wrapped native CLI rather than swallowed by our own version
+// handler below. Our version flag only applies when not delegating.
+if (process.argv.includes("--cli")) {
  const { spawn } = await import("node:child_process");
  const args = process.argv.slice(2).filter((arg) => arg !== "--cli");
  const child = spawn(await claudeCliPath(), args, { stdio: "inherit" });
@@ -37,6 +37,9 @@ if (process.argv.includes("--version") || process.argv.includes("-v")) {
    console.error(err);
    process.exit(1);
  });
+} else if (process.argv.includes("--version") || process.argv.includes("-v")) {
+  console.log(packageJson.version);
+  process.exit(0);
 } else {
  // Apply env vars from the managed-policy tier before any SDK call so the
  // SDK subprocess inherits them. Going through resolveSettings (vs. a raw
--- a/src/sdk-shims.d.ts
+++ b/src/sdk-shims.d.ts
@@ -0,0 +1,38 @@
+/**
+ * Shims for types the `@anthropic-ai/claude-agent-sdk` 0.3.198 `sdk.d.ts`
+ * references in its `SDKMessage` union but never declares
+ * (`SDKControlRequestProgressMessage`, `SDKConversationResetMessage`). With
+ * `skipLibCheck` the dangling references silently become error-`any`, which
+ * poisons narrowing on the whole union — every exhaustive switch over
+ * `SDKMessage` stops compiling.
+ *
+ * These must stay GLOBAL declarations (no top-level import/export in this
+ * file): unqualified names inside the SDK's module declaration fall back to
+ * the global scope, which is the only way a consumer can supply them. Shapes
+ * are transcribed from the zod schemas embedded in the bundled CLI binary.
+ * Delete this file once the SDK ships the declarations itself — a proper
+ * module-scoped declaration will shadow these.
+ */
+
+/** Progress for a long-running client-originated control request (currently
+ *  only `side_question`), correlated by `request_id`. */
+declare type SDKControlRequestProgressMessage = {
+  type: "control_request_progress";
+  request_id: string;
+  status: "started" | "api_retry";
+  attempt?: number;
+  max_retries?: number;
+  retry_delay_ms?: number;
+  error_status?: number | null;
+  uuid: import("crypto").UUID;
+  session_id: string;
+};
+
+/** Emitted by `/clear`, plan-mode exit, and fresh-session flows; the surface
+ *  should mount a fresh transcript under `new_conversation_id`. */
+declare type SDKConversationResetMessage = {
+  type: "conversation_reset";
+  new_conversation_id: import("crypto").UUID;
+  uuid: import("crypto").UUID;
+  session_id: string;
+};
--- a/src/tests/acp-agent-settings.test.ts
+++ b/src/tests/acp-agent-settings.test.ts
@@ -811,6 +811,55 @@ describe("ClaudeAcpAgent settings", () => {
        }
      }
    });
+
+    it("maps allowlist aliases through modelOverrides to provider IDs", async () => {
+      // Bedrock/Vertex deployments enforce short aliases in availableModels
+      // but require provider-specific IDs at the API. Without applying
+      // modelOverrides during allowlist resolution, the alias is surfaced as
+      // the model value and passed verbatim to setModel, which the provider
+      // API rejects with a 400 "invalid model identifier".
+      await fs.promises.writeFile(
+        path.join(tempDir, "settings.json"),
+        JSON.stringify({
+          availableModels: ["claude-opus-4-6", "claude-sonnet-4-6"],
+          model: "claude-opus-4-6",
+          modelOverrides: {
+            "claude-opus-4-6": "global.anthropic.claude-opus-4-6-v1[1m]",
+            "claude-sonnet-4-6": "global.anthropic.claude-sonnet-4-6[1m]",
+          },
+        }),
+      );
+
+      const projectDir = path.join(tempDir, "project");
+      await fs.promises.mkdir(projectDir, { recursive: true });
+
+      const { setModelSpy } = mockQueryWithModels([
+        { value: "default", displayName: "Default", description: "Default model" },
+        { value: "opus", displayName: "Opus", description: "Claude Opus 4.6" },
+        { value: "sonnet", displayName: "Sonnet", description: "Claude Sonnet 4.6" },
+      ]);
+
+      const { ClaudeAcpAgent } = await import("../acp-agent.js");
+      const agent: ClaudeAcpAgentType = new ClaudeAcpAgent(createMockClient());
+
+      const response = await (agent as any).createSession({
+        cwd: projectDir,
+        mcpServers: [],
+        _meta: { disableBuiltInTools: true },
+      });
+
+      const modelOption = response.configOptions.find((o: any) => o.id === "model");
+      expect(modelOption.options.map((o: any) => o.value)).toEqual([
+        "default",
+        "global.anthropic.claude-opus-4-6-v1[1m]",
+        "global.anthropic.claude-sonnet-4-6[1m]",
+      ]);
+      // The allowlist synthesized the overridden ID (the SDK only surfaced the
+      // `opus` alias), so the adapter syncs the provider ID via setModel — never
+      // the raw alias that Bedrock would reject.
+      expect(setModelSpy).toHaveBeenCalledWith("global.anthropic.claude-opus-4-6-v1[1m]");
+      expect(modelOption.currentValue).toBe("global.anthropic.claude-opus-4-6-v1[1m]");
+    });
  });

  it("resolves model aliases like opus[1m] to the correct model", async () => {
--- 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
@@ -613,4 +613,127 @@ describe("createSession options merging", () => {
      expect(capturedOptions!.disallowedTools).not.toContain("AskUserQuestion");
    });
  });
+
+  describe("refusal fallback dialog", () => {
+    it("declares the dialog kind and callback when the client supports form elicitation", async () => {
+      await agent.initialize({
+        protocolVersion: 1,
+        clientCapabilities: { elicitation: { form: {} } },
+      });
+      await agent.newSession({ cwd: process.cwd(), mcpServers: [] });
+
+      expect(capturedOptions!.supportedDialogKinds).toEqual(["refusal_fallback_prompt"]);
+      expect(typeof capturedOptions!.onUserDialog).toBe("function");
+    });
+
+    it("omits the dialog wiring without form elicitation support (url-only included)", async () => {
+      await agent.initialize({
+        protocolVersion: 1,
+        clientCapabilities: { elicitation: { url: {} } },
+      });
+      await agent.newSession({ cwd: process.cwd(), mcpServers: [] });
+
+      // The CLI fails closed on the undeclared kind, so the flow degrades to
+      // the classic refusal error instead of parking a dialog we can't render.
+      expect(capturedOptions!.supportedDialogKinds).toBeUndefined();
+      expect(capturedOptions!.onUserDialog).toBeUndefined();
+    });
+
+    /** Wire the session up with form support and return the captured dialog
+     *  callback plus a mock the test can point the elicitation response at. */
+    async function setupDialog() {
+      await agent.initialize({
+        protocolVersion: 1,
+        clientCapabilities: { elicitation: { form: {} } },
+      });
+      await agent.newSession({ cwd: process.cwd(), mcpServers: [] });
+      const createElicitation = vi.fn();
+      (
+        agent as unknown as { client: { unstable_createElicitation: unknown } }
+      ).client.unstable_createElicitation = createElicitation;
+      return { onUserDialog: capturedOptions!.onUserDialog!, createElicitation };
+    }
+
+    const signal = () => ({ signal: new AbortController().signal });
+
+    it("renders the prompt as a form elicitation and maps the retry choice", async () => {
+      const { onUserDialog, createElicitation } = await setupDialog();
+      createElicitation.mockResolvedValue({
+        action: "accept",
+        content: { choice: "retry_fallback" },
+      });
+
+      const result = await onUserDialog(
+        {
+          dialogKind: "refusal_fallback_prompt",
+          payload: {
+            originalModel: "claude-fable-5",
+            fallbackModel: "claude-opus-4-8",
+            apiRefusalCategory: "cyber",
+          },
+        },
+        signal(),
+      );
+
+      expect(result).toEqual({ behavior: "completed", result: "retry_fallback" });
+      const request = createElicitation.mock.calls[0][0];
+      expect(request.mode).toBe("form");
+      expect(request.message).toContain("claude-fable-5");
+      expect(request.message).toContain("claude-opus-4-8");
+    });
+
+    it("completes with cancelled when the user keeps the refusal", async () => {
+      const { onUserDialog, createElicitation } = await setupDialog();
+      createElicitation.mockResolvedValue({ action: "cancel" });
+
+      const result = await onUserDialog(
+        {
+          dialogKind: "refusal_fallback_prompt",
+          payload: { originalModel: "a", fallbackModel: "b" },
+        },
+        signal(),
+      );
+
+      expect(result).toEqual({ behavior: "completed", result: "cancelled" });
+    });
+
+    it("cancels unrecognized dialog kinds without presenting anything", async () => {
+      const { onUserDialog, createElicitation } = await setupDialog();
+
+      const result = await onUserDialog(
+        { dialogKind: "some_future_dialog", payload: {} },
+        signal(),
+      );
+
+      expect(result).toEqual({ behavior: "cancelled" });
+      expect(createElicitation).not.toHaveBeenCalled();
+    });
+
+    it("cancels on a malformed payload without presenting anything", async () => {
+      const { onUserDialog, createElicitation } = await setupDialog();
+
+      const result = await onUserDialog(
+        { dialogKind: "refusal_fallback_prompt", payload: { fallbackModel: 42 } },
+        signal(),
+      );
+
+      expect(result).toEqual({ behavior: "cancelled" });
+      expect(createElicitation).not.toHaveBeenCalled();
+    });
+
+    it("cancels when the elicitation request fails", async () => {
+      const { onUserDialog, createElicitation } = await setupDialog();
+      createElicitation.mockRejectedValue(new Error("client exploded"));
+
+      const result = await onUserDialog(
+        {
+          dialogKind: "refusal_fallback_prompt",
+          payload: { originalModel: "a", fallbackModel: "b" },
+        },
+        signal(),
+      );
+
+      expect(result).toEqual({ behavior: "cancelled" });
+    });
+  });
 });
--- a/src/tests/elicitation.test.ts
+++ b/src/tests/elicitation.test.ts
@@ -11,7 +11,10 @@ import {
  AskUserQuestion,
  createElicitationResponseToElicitResult,
  extractAskUserQuestions,
+  extractRefusalFallbackPrompt,
  mcpElicitationToCreateRequest,
+  refusalFallbackResultFromResponse,
+  refusalFallbackToCreateRequest,
 } from "../elicitation.js";

 const SESSION_ID = "session-1";
@@ -389,3 +392,101 @@ describe("applyAskElicitationResponse", () => {
    );
  });
 });
+
+describe("extractRefusalFallbackPrompt", () => {
+  it("extracts required and optional fields", () => {
+    expect(
+      extractRefusalFallbackPrompt({
+        originalModel: "claude-fable-5",
+        fallbackModel: "claude-opus-4-8",
+        apiRefusalCategory: "cyber",
+        guidanceText: "You can retry with the fallback model.",
+        retractedMessageUuids: ["u1"],
+      }),
+    ).toEqual({
+      originalModel: "claude-fable-5",
+      fallbackModel: "claude-opus-4-8",
+      apiRefusalCategory: "cyber",
+      guidanceText: "You can retry with the fallback model.",
+    });
+  });
+
+  it("returns null when a required model field is missing or mistyped", () => {
+    expect(extractRefusalFallbackPrompt({ fallbackModel: "claude-opus-4-8" })).toBeNull();
+    expect(
+      extractRefusalFallbackPrompt({ originalModel: 5, fallbackModel: "claude-opus-4-8" }),
+    ).toBeNull();
+  });
+
+  it("normalizes a non-string category to null and drops empty guidance", () => {
+    expect(
+      extractRefusalFallbackPrompt({
+        originalModel: "a",
+        fallbackModel: "b",
+        apiRefusalCategory: null,
+        guidanceText: "",
+      }),
+    ).toEqual({ originalModel: "a", fallbackModel: "b", apiRefusalCategory: null });
+  });
+});
+
+describe("refusalFallbackToCreateRequest", () => {
+  const prompt = {
+    originalModel: "claude-fable-5",
+    fallbackModel: "claude-opus-4-8",
+    apiRefusalCategory: "cyber" as string | null,
+  };
+
+  it("builds a single-choice form whose enum consts are the dialog's wire results", () => {
+    const request = refusalFallbackToCreateRequest(prompt, SESSION_ID) as Extract<
+      CreateElicitationRequest,
+      { mode: "form" }
+    >;
+    expect(request.mode).toBe("form");
+    expect(request).toMatchObject({ sessionId: SESSION_ID });
+    expect(request.message).toContain("claude-fable-5");
+    expect(request.message).toContain("(cyber)");
+    expect(request.message).toContain("claude-opus-4-8");
+
+    const choice = request.requestedSchema.properties?.choice as {
+      type: string;
+      oneOf: Array<{ const: string; title: string }>;
+    };
+    expect(choice.type).toBe("string");
+    expect(choice.oneOf.map((o) => o.const)).toEqual(["retry_fallback", "cancelled"]);
+    expect(choice.oneOf[0].title).toContain("claude-opus-4-8");
+  });
+
+  it("omits the category marker and appends guidance when provided", () => {
+    const request = refusalFallbackToCreateRequest(
+      { ...prompt, apiRefusalCategory: null, guidanceText: "Consider rephrasing." },
+      SESSION_ID,
+    );
+    expect(request.message).not.toContain("(");
+    expect(request.message).toContain("Consider rephrasing.");
+  });
+});
+
+describe("refusalFallbackResultFromResponse", () => {
+  it("maps an accepted retry choice to retry_fallback", () => {
+    const response = {
+      action: "accept",
+      content: { choice: "retry_fallback" },
+    } as CreateElicitationResponse;
+    expect(refusalFallbackResultFromResponse(response)).toBe("retry_fallback");
+  });
+
+  it("keeps the refusal for every other outcome", () => {
+    const cases = [
+      { action: "accept", content: { choice: "cancelled" } },
+      { action: "accept", content: {} },
+      { action: "accept", content: { choice: "something-new" } },
+      { action: "accept" },
+      { action: "decline" },
+      { action: "cancel" },
+    ] as CreateElicitationResponse[];
+    for (const response of cases) {
+      expect(refusalFallbackResultFromResponse(response)).toBe("cancelled");
+    }
+  });
+});
--- a/src/tests/fast-mode-config.test.ts
+++ b/src/tests/fast-mode-config.test.ts
@@ -0,0 +1,341 @@
+import { describe, it, expect, vi } from "vitest";
+import type { ClientCapabilities, SessionNotification } from "@agentclientprotocol/sdk";
+import type { ModelInfo } from "@anthropic-ai/claude-agent-sdk";
+import {
+  buildConfigOptions,
+  clientSupportsBooleanConfigOptions,
+  createFastModeConfigOption,
+  fastModeStateEnabled,
+  resolveFastModeEnabled,
+  FAST_MODE_CONFIG_ID,
+  FAST_MODE_ON,
+  FAST_MODE_OFF,
+  ClaudeAcpAgent,
+  type AcpClient,
+} from "../acp-agent.js";
+
+const MODES = {
+  currentModeId: "default",
+  availableModes: [{ id: "default", name: "Default", description: "Standard behavior" }],
+};
+
+const MODELS = {
+  currentModelId: "claude-opus-4-8",
+  availableModels: [
+    { modelId: "claude-opus-4-8", name: "Claude Opus", description: "Most capable" },
+  ],
+};
+
+const MODEL_INFOS: ModelInfo[] = [
+  { value: "claude-opus-4-8", displayName: "Claude Opus", description: "Most capable" },
+];
+
+describe("createFastModeConfigOption", () => {
+  it("produces a native boolean toggle when the client opted in", () => {
+    expect(createFastModeConfigOption(true, true)).toEqual({
+      id: FAST_MODE_CONFIG_ID,
+      name: "Fast mode",
+      description: expect.any(String),
+      category: "model_config",
+      type: "boolean",
+      currentValue: true,
+    });
+  });
+
+  it("falls back to an on/off select when the client did not opt in", () => {
+    const option = createFastModeConfigOption(false, false);
+    expect(option).toMatchObject({
+      id: FAST_MODE_CONFIG_ID,
+      type: "select",
+      category: "model_config",
+      currentValue: FAST_MODE_OFF,
+      options: [
+        { value: FAST_MODE_ON, name: "On" },
+        { value: FAST_MODE_OFF, name: "Off" },
+      ],
+    });
+    expect(option).not.toHaveProperty("currentValue", true);
+  });
+});
+
+describe("clientSupportsBooleanConfigOptions", () => {
+  it("is true only when session.configOptions.boolean is present", () => {
+    expect(
+      clientSupportsBooleanConfigOptions({ session: { configOptions: { boolean: {} } } }),
+    ).toBe(true);
+  });
+
+  it("is false when the capability is omitted or null at any level", () => {
+    expect(clientSupportsBooleanConfigOptions(undefined)).toBe(false);
+    expect(clientSupportsBooleanConfigOptions(null)).toBe(false);
+    expect(clientSupportsBooleanConfigOptions({})).toBe(false);
+    expect(clientSupportsBooleanConfigOptions({ session: { configOptions: {} } })).toBe(false);
+    expect(
+      clientSupportsBooleanConfigOptions({ session: { configOptions: { boolean: null } } }),
+    ).toBe(false);
+  });
+});
+
+describe("resolveFastModeEnabled", () => {
+  const base = { sessionId: "s", configId: FAST_MODE_CONFIG_ID };
+
+  it("accepts native boolean values", () => {
+    expect(resolveFastModeEnabled({ ...base, type: "boolean", value: true })).toBe(true);
+    expect(resolveFastModeEnabled({ ...base, type: "boolean", value: false })).toBe(false);
+  });
+
+  it("accepts the on/off select fallback", () => {
+    expect(resolveFastModeEnabled({ ...base, value: FAST_MODE_ON })).toBe(true);
+    expect(resolveFastModeEnabled({ ...base, value: FAST_MODE_OFF })).toBe(false);
+  });
+
+  it("rejects any other value", () => {
+    expect(() => resolveFastModeEnabled({ ...base, value: "maybe" })).toThrow(
+      /Invalid value for config option fast/,
+    );
+  });
+});
+
+describe("fastModeStateEnabled", () => {
+  it("treats cooldown as on (the user's intent persists through rate-limit cooldown)", () => {
+    expect(fastModeStateEnabled("on")).toBe(true);
+    expect(fastModeStateEnabled("cooldown")).toBe(true);
+    expect(fastModeStateEnabled("off")).toBe(false);
+  });
+});
+
+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", {
+      supported: false,
+      enabled: false,
+      useBooleanOption: true,
+    });
+    expect(options.find((o) => o.id === FAST_MODE_CONFIG_ID)).toBeUndefined();
+  });
+
+  it("omits the Fast mode option when no fast mode state is provided", () => {
+    const options = buildConfigOptions(MODES, MODELS, MODEL_INFOS, undefined, [], "default");
+    expect(options.find((o) => o.id === FAST_MODE_CONFIG_ID)).toBeUndefined();
+  });
+
+  it("surfaces a boolean toggle when supported and the client opted in", () => {
+    const options = buildConfigOptions(MODES, MODELS, MODEL_INFOS, undefined, [], "default", {
+      supported: true,
+      enabled: true,
+      useBooleanOption: true,
+    });
+    expect(options).toContainEqual(createFastModeConfigOption(true, true));
+  });
+
+  it("surfaces a select fallback when supported but the client did not opt in", () => {
+    const options = buildConfigOptions(MODES, MODELS, MODEL_INFOS, undefined, [], "default", {
+      supported: true,
+      enabled: false,
+      useBooleanOption: false,
+    });
+    expect(options).toContainEqual(createFastModeConfigOption(false, false));
+  });
+});
+
+describe("setSessionConfigOption Fast mode toggle", () => {
+  const SESSION_ID = "fast-session";
+
+  function setup(opts: { useBooleanOption: boolean }) {
+    const sessionUpdates: SessionNotification[] = [];
+    const client = {
+      sessionUpdate: async (n: SessionNotification) => {
+        sessionUpdates.push(n);
+      },
+      requestPermission: async () => ({ outcome: { outcome: "cancelled" } }),
+      readTextFile: async () => ({ content: "" }),
+      writeTextFile: async () => ({}),
+    } as unknown as AcpClient;
+
+    const agent = new ClaudeAcpAgent(client);
+    const clientCapabilities: ClientCapabilities = opts.useBooleanOption
+      ? { session: { configOptions: { boolean: {} } } }
+      : {};
+    (agent as unknown as { clientCapabilities: ClientCapabilities }).clientCapabilities =
+      clientCapabilities;
+
+    const applyFlagSettings = vi.fn();
+    (agent as unknown as { sessions: Record<string, unknown> }).sessions[SESSION_ID] = {
+      query: { applyFlagSettings },
+      fastModeEnabled: false,
+      configOptions: [createFastModeConfigOption(false, opts.useBooleanOption)],
+    };
+
+    return { agent, applyFlagSettings, sessionUpdates };
+  }
+
+  it("toggles Fast mode on/off through a boolean value", async () => {
+    const { agent, applyFlagSettings } = setup({ useBooleanOption: true });
+
+    const onResponse = await agent.setSessionConfigOption({
+      sessionId: SESSION_ID,
+      configId: FAST_MODE_CONFIG_ID,
+      type: "boolean",
+      value: true,
+    });
+    expect(applyFlagSettings).toHaveBeenCalledWith({ fastMode: true });
+    expect(onResponse.configOptions).toContainEqual(createFastModeConfigOption(true, true));
+    expect(
+      (agent as unknown as { sessions: Record<string, { fastModeEnabled: boolean }> }).sessions[
+        SESSION_ID
+      ].fastModeEnabled,
+    ).toBe(true);
+
+    const offResponse = await agent.setSessionConfigOption({
+      sessionId: SESSION_ID,
+      configId: FAST_MODE_CONFIG_ID,
+      type: "boolean",
+      value: false,
+    });
+    expect(applyFlagSettings).toHaveBeenLastCalledWith({ fastMode: false });
+    expect(offResponse.configOptions).toContainEqual(createFastModeConfigOption(false, true));
+  });
+
+  it("toggles Fast mode through the on/off select fallback", async () => {
+    const { agent, applyFlagSettings } = setup({ useBooleanOption: false });
+
+    const response = await agent.setSessionConfigOption({
+      sessionId: SESSION_ID,
+      configId: FAST_MODE_CONFIG_ID,
+      value: FAST_MODE_ON,
+    });
+    expect(applyFlagSettings).toHaveBeenCalledWith({ fastMode: true });
+    expect(response.configOptions).toContainEqual(createFastModeConfigOption(true, false));
+  });
+
+  it("does not change session state when the SDK rejects the flag", async () => {
+    const { agent, applyFlagSettings } = setup({ useBooleanOption: true });
+    applyFlagSettings.mockRejectedValueOnce(new Error("nope"));
+
+    await expect(
+      agent.setSessionConfigOption({
+        sessionId: SESSION_ID,
+        configId: FAST_MODE_CONFIG_ID,
+        type: "boolean",
+        value: true,
+      }),
+    ).rejects.toThrow("nope");
+
+    const session = (agent as unknown as { sessions: Record<string, { fastModeEnabled: boolean }> })
+      .sessions[SESSION_ID];
+    expect(session.fastModeEnabled).toBe(false);
+  });
+});
+
+describe("syncFastModeState (SDK-driven state changes)", () => {
+  const SESSION_ID = "fast-session";
+
+  function setup(opts: { fastModeEnabled: boolean; withOption: boolean }) {
+    const sessionUpdates: SessionNotification[] = [];
+    const client = {
+      sessionUpdate: async (n: SessionNotification) => {
+        sessionUpdates.push(n);
+      },
+      requestPermission: async () => ({ outcome: { outcome: "cancelled" } }),
+      readTextFile: async () => ({ content: "" }),
+      writeTextFile: async () => ({}),
+    } as unknown as AcpClient;
+
+    const agent = new ClaudeAcpAgent(client);
+    (agent as unknown as { clientCapabilities: ClientCapabilities }).clientCapabilities = {
+      session: { configOptions: { boolean: {} } },
+    };
+
+    const session = {
+      query: {},
+      fastModeEnabled: opts.fastModeEnabled,
+      configOptions: opts.withOption
+        ? [createFastModeConfigOption(opts.fastModeEnabled, true)]
+        : [],
+    };
+    (agent as unknown as { sessions: Record<string, unknown> }).sessions[SESSION_ID] = session;
+
+    const sync = (
+      agent as unknown as {
+        syncFastModeState: (
+          sessionId: string,
+          session: unknown,
+          state: string | undefined,
+        ) => Promise<void>;
+      }
+    ).syncFastModeState.bind(agent);
+
+    return { sync, session, sessionUpdates };
+  }
+
+  it("emits a config_option_update when the SDK reports a new state", async () => {
+    const { sync, session, sessionUpdates } = setup({ fastModeEnabled: false, withOption: true });
+
+    await sync(SESSION_ID, session, "on");
+
+    expect(session.fastModeEnabled).toBe(true);
+    expect(session.configOptions).toContainEqual(createFastModeConfigOption(true, true));
+    expect(sessionUpdates).toHaveLength(1);
+    expect(sessionUpdates[0].update).toMatchObject({
+      sessionUpdate: "config_option_update",
+    });
+    const updated = (
+      sessionUpdates[0].update as { configOptions: ReturnType<typeof createFastModeConfigOption>[] }
+    ).configOptions;
+    expect(updated).toContainEqual(createFastModeConfigOption(true, true));
+  });
+
+  it("leaves the toggle on and quiet during a rate-limit cooldown", async () => {
+    const { sync, session, sessionUpdates } = setup({ fastModeEnabled: true, withOption: true });
+
+    // cooldown is a transient suspension of an already-enabled fast mode.
+    await sync(SESSION_ID, session, "cooldown");
+
+    expect(session.fastModeEnabled).toBe(true);
+    expect(sessionUpdates).toHaveLength(0);
+  });
+
+  it("never lets a stray cooldown spuriously enable a toggle the user has off", async () => {
+    const { sync, session, sessionUpdates } = setup({ fastModeEnabled: false, withOption: true });
+
+    await sync(SESSION_ID, session, "cooldown");
+
+    expect(session.fastModeEnabled).toBe(false);
+    expect(sessionUpdates).toHaveLength(0);
+  });
+
+  it("clears the toggle when the SDK reports off", async () => {
+    const { sync, session, sessionUpdates } = setup({ fastModeEnabled: true, withOption: true });
+
+    await sync(SESSION_ID, session, "off");
+
+    expect(session.fastModeEnabled).toBe(false);
+    expect(session.configOptions).toContainEqual(createFastModeConfigOption(false, true));
+    expect(sessionUpdates).toHaveLength(1);
+  });
+
+  it("is a no-op when the reported state is undefined or unchanged", async () => {
+    const { sync, session, sessionUpdates } = setup({ fastModeEnabled: false, withOption: true });
+
+    await sync(SESSION_ID, session, undefined);
+    await sync(SESSION_ID, session, "off");
+
+    expect(sessionUpdates).toHaveLength(0);
+  });
+
+  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
+    // correct when a supporting model is reselected — reconciling here was the
+    // original intent-clobber bug.
+    const enabledCase = setup({ fastModeEnabled: true, withOption: false });
+    await enabledCase.sync(SESSION_ID, enabledCase.session, "off");
+    expect(enabledCase.session.fastModeEnabled).toBe(true);
+    expect(enabledCase.sessionUpdates).toHaveLength(0);
+
+    const disabledCase = setup({ fastModeEnabled: false, withOption: false });
+    await disabledCase.sync(SESSION_ID, disabledCase.session, "on");
+    expect(disabledCase.session.fastModeEnabled).toBe(false);
+    expect(disabledCase.sessionUpdates).toHaveLength(0);
+  });
+});
--- a/src/tests/model-resolution.test.ts
+++ b/src/tests/model-resolution.test.ts
@@ -0,0 +1,150 @@
+import { describe, it, expect } from "vitest";
+import { randomUUID } from "crypto";
+import { query } from "@anthropic-ai/claude-agent-sdk";
+import type { ModelInfo } from "@anthropic-ai/claude-agent-sdk";
+import { resolveModelPreference, applyAvailableModelsAllowlist } from "../acp-agent.js";
+
+// Mirrors a real `supportedModels()` response: alias rows carry
+// `resolvedModel`, and "Sonnet 5" has no `major.minor` dot unlike older
+// "claude-opus-4-6"-style ids.
+const LIVE_SHAPED_MODELS: ModelInfo[] = [
+  {
+    value: "default",
+    resolvedModel: "claude-opus-4-8[1m]",
+    displayName: "Default (recommended)",
+    description: "Use the default model (currently Opus 4.8 (1M context))",
+  },
+  {
+    value: "opus[1m]",
+    resolvedModel: "claude-opus-4-8[1m]",
+    displayName: "Opus",
+    description: "Opus 4.8 with 1M context · Best for everyday, complex tasks",
+  },
+  {
+    value: "sonnet",
+    resolvedModel: "claude-sonnet-5",
+    displayName: "Sonnet",
+    description: "Sonnet 5 · Efficient for routine tasks",
+  },
+  {
+    value: "haiku",
+    resolvedModel: "claude-haiku-4-5-20251001",
+    displayName: "Haiku",
+    description: "Haiku 4.5 · Fastest for quick answers",
+  },
+];
+
+describe("resolveModelPreference - resolvedModel matching", () => {
+  it("matches a preference that equals an alias's resolvedModel exactly", () => {
+    expect(resolveModelPreference(LIVE_SHAPED_MODELS, "claude-sonnet-5")?.value).toBe("sonnet");
+    expect(resolveModelPreference(LIVE_SHAPED_MODELS, "claude-opus-4-8[1m]")?.value).toBe(
+      "opus[1m]",
+    );
+    expect(resolveModelPreference(LIVE_SHAPED_MODELS, "claude-haiku-4-5-20251001")?.value).toBe(
+      "haiku",
+    );
+  });
+
+  it("is case-insensitive", () => {
+    expect(resolveModelPreference(LIVE_SHAPED_MODELS, "CLAUDE-SONNET-5")?.value).toBe("sonnet");
+  });
+
+  it("still resolves plain aliases via the direct-match tier", () => {
+    expect(resolveModelPreference(LIVE_SHAPED_MODELS, "sonnet")?.value).toBe("sonnet");
+    expect(resolveModelPreference(LIVE_SHAPED_MODELS, "opus[1m]")?.value).toBe("opus[1m]");
+  });
+
+  it("does not let a retired dated id drift onto a same-family alias of a different generation", () => {
+    expect(resolveModelPreference(LIVE_SHAPED_MODELS, "claude-sonnet-4-6")).toBeNull();
+  });
+
+  // "opus[1m]"'s `value` has no dotted version, just the context-hint digit
+  // in "[1m]" — unstripped, that reads as version "1" and blocks the match
+  // before the matcher reaches the description's real "4.8".
+  it("does not mistake an alias's context-hint suffix for its version", () => {
+    expect(resolveModelPreference(LIVE_SHAPED_MODELS, "claude-opus-4-8")?.value).toBe("opus[1m]");
+  });
+
+  it("returns null for a preference that matches nothing", () => {
+    expect(resolveModelPreference(LIVE_SHAPED_MODELS, "claude-gpt-99")).toBeNull();
+  });
+});
+
+describe("applyAvailableModelsAllowlist - resolvedModel matching", () => {
+  it("resolves an allowlist entry pinned to a canonical resolvedModel id", () => {
+    const result = applyAvailableModelsAllowlist(LIVE_SHAPED_MODELS, ["claude-sonnet-5"]);
+    const entry = result.find((m) => m.value === "claude-sonnet-5");
+    expect(entry).toBeDefined();
+    expect(entry?.displayName).toBe("Sonnet");
+  });
+});
+
+describe("applyAvailableModelsAllowlist - modelOverrides", () => {
+  const SDK_MODELS: ModelInfo[] = [
+    { value: "default", displayName: "Default", description: "Default model" },
+    {
+      value: "opus",
+      displayName: "Opus",
+      description: "Claude Opus 4.6",
+      supportsEffort: true,
+      supportedEffortLevels: ["low", "high"],
+    },
+  ];
+
+  it("surfaces the override target as the value while keeping the alias's display metadata", () => {
+    // The override target is an opaque Bedrock ARN with no "opus" substring,
+    // so matching against it (instead of the "claude-opus-4-6" alias) would
+    // find nothing and silently drop displayName/description/supportsEffort.
+    const overrides = {
+      "claude-opus-4-6": "arn:aws:bedrock:us-west-2:111122223333:inference-profile/custom-7f3a",
+    };
+    const result = applyAvailableModelsAllowlist(SDK_MODELS, ["claude-opus-4-6"], overrides);
+
+    const entry = result.find((m) => m.value === overrides["claude-opus-4-6"]);
+    expect(entry).toEqual({
+      value: overrides["claude-opus-4-6"],
+      displayName: "Opus",
+      description: "Claude Opus 4.6",
+      supportsEffort: true,
+      supportedEffortLevels: ["low", "high"],
+    });
+  });
+});
+
+// Runs against the real SDK (no mocks) so the fixture above is flagged the
+// moment the SDK's actual model list shape drifts from it. Requires a usable
+// ANTHROPIC_API_KEY, hence opt-in via RUN_INTEGRATION_TESTS.
+describe.skipIf(!process.env.RUN_INTEGRATION_TESTS)("model resolution (real SDK)", () => {
+  it("every model's resolvedModel (when present) resolves back to that same row", async () => {
+    const q = query({ prompt: "hi", options: { sessionId: randomUUID() } });
+    try {
+      const models = await q.supportedModels();
+      expect(models.length).toBeGreaterThan(0);
+
+      for (const model of models) {
+        // "default" shares a resolvedModel with the CLI's recommended named
+        // alias, and resolution intentionally prefers that alias on a tie.
+        if (!model.resolvedModel || model.value === "default") continue;
+        const resolved = resolveModelPreference(models, model.resolvedModel);
+        expect(resolved?.value).toBe(model.value);
+      }
+    } finally {
+      q.return(undefined);
+    }
+  }, 30000);
+
+  it("resolves the well-known 'sonnet' and 'opus' aliases to a model bearing their family name", async () => {
+    const q = query({ prompt: "hi", options: { sessionId: randomUUID() } });
+    try {
+      const models = await q.supportedModels();
+
+      const sonnet = resolveModelPreference(models, "sonnet");
+      expect(sonnet?.resolvedModel?.toLowerCase()).toContain("sonnet");
+
+      const opus = resolveModelPreference(models, "opus");
+      expect(opus?.resolvedModel?.toLowerCase()).toContain("opus");
+    } finally {
+      q.return(undefined);
+    }
+  }, 30000);
+});
--- a/src/tests/session-config-options.test.ts
+++ b/src/tests/session-config-options.test.ts
@@ -113,17 +113,17 @@ describe("session config options", () => {
      settingsManager: {},
      modes: structuredClone(MOCK_MODES),
      models: structuredClone(MOCK_MODELS),
-      modelInfos: MOCK_MODELS.availableModels.map(
-        (m): ModelInfo => ({
-          value: m.modelId,
-          displayName: m.name,
-          description: m.description,
-          supportsEffort: true,
-          supportedEffortLevels: ["low", "medium", "high"],
-        }),
-      ),
+      modelInfos: MOCK_MODELS.availableModels.map((m): ModelInfo => ({
+        value: m.modelId,
+        displayName: m.name,
+        description: m.description,
+        supportsEffort: true,
+        supportedEffortLevels: ["low", "medium", "high"],
+      })),
      configOptions: structuredClone(MOCK_CONFIG_OPTIONS),
      contextWindowSize: 200000,
+      toolUseCache: {},
+      emittedToolCalls: new Set(),
    };
  }

@@ -1113,6 +1113,10 @@ describe("session config options", () => {
        ],
      };

+      // The tool_call was already surfaced (by the streamed tool_use chunk), so
+      // the permission request won't re-emit one — keep this focused on options.
+      session.emittedToolCalls.add("toolu_1");
+
      const canUseTool = (agent as any).canUseTool(SESSION_ID);
      const signal = new AbortController().signal;
      try {
@@ -1144,6 +1148,10 @@ describe("session config options", () => {
        ],
      };
      permissionResponse = { outcome: { outcome: "selected", optionId: "auto" } };
+      // The tool_call was already surfaced (by the streamed tool_use chunk), so
+      // the permission request won't re-emit one — the deny path below should
+      // produce no session updates at all.
+      session.emittedToolCalls.add("toolu_2");

      const canUseTool = (agent as any).canUseTool(SESSION_ID);
      const result = await canUseTool(
@@ -1172,6 +1180,10 @@ describe("session config options", () => {
        ],
      };

+      // The tool_call was already surfaced (by the streamed tool_use chunk), so
+      // the permission request won't re-emit one — keep this focused on options.
+      session.emittedToolCalls.add("toolu_3");
+
      const canUseTool = (agent as any).canUseTool(SESSION_ID);
      const signal = new AbortController().signal;
      try {
--- a/src/tests/tools.test.ts
+++ b/src/tests/tools.test.ts
@@ -1614,6 +1614,68 @@ describe("toolInfoFromToolUse - undefined input regression", () => {
    const info = toolInfoFromToolUse(toolUse, false);
    expect(info.title).toBe("Update TODOs");
  });
+
+  it("ReportFindings with undefined input should not throw", () => {
+    const toolUse = { name: "ReportFindings", id: "toolu_findings_undef", input: undefined };
+    const info = toolInfoFromToolUse(toolUse, false);
+    expect(info.title).toBe("Report findings: none found");
+    expect(info.content).toEqual([]);
+  });
+});
+
+describe("toolInfoFromToolUse - ReportFindings", () => {
+  it("should summarize findings count and list each in content", () => {
+    const toolUse = {
+      name: "ReportFindings",
+      id: "toolu_findings_1",
+      input: {
+        findings: [
+          {
+            file: "src/foo.ts",
+            line: 42,
+            summary: "Off-by-one in loop bound",
+            failure_scenario: "Empty array → index out of bounds crash",
+          },
+          {
+            file: "src/bar.ts",
+            summary: "Unhandled promise rejection",
+            failure_scenario: "Network failure → unhandled rejection",
+          },
+        ],
+      },
+    };
+
+    const info = toolInfoFromToolUse(toolUse, false);
+
+    expect(info.kind).toBe("think");
+    expect(info.title).toBe("Report 2 findings");
+    expect(info.content).toEqual([
+      {
+        type: "content",
+        content: { type: "text", text: "**src/foo.ts:42** — Off-by-one in loop bound" },
+      },
+      {
+        type: "content",
+        content: { type: "text", text: "**src/bar.ts** — Unhandled promise rejection" },
+      },
+    ]);
+  });
+
+  it("should report a singular title and empty findings array", () => {
+    const oneFinding = {
+      name: "ReportFindings",
+      id: "toolu_findings_2",
+      input: { findings: [{ file: "src/baz.ts", summary: "Leak", failure_scenario: "..." }] },
+    };
+    expect(toolInfoFromToolUse(oneFinding, false).title).toBe("Report 1 finding");
+
+    const noFindings = {
+      name: "ReportFindings",
+      id: "toolu_findings_3",
+      input: { findings: [] },
+    };
+    expect(toolInfoFromToolUse(noFindings, false).title).toBe("Report findings: none found");
+  });
 });

 describe("planEntries - undefined input regression", () => {
--- a/src/tools.ts
+++ b/src/tools.ts
@@ -15,6 +15,7 @@ import {
  FileWriteInput,
  GlobInput,
  GrepInput,
+  ReportFindingsInput,
  TaskCreateInput,
  TaskCreateOutput,
  TaskUpdateInput,
@@ -371,6 +372,25 @@ export function toolInfoFromToolUse(
      };
    }

+    case "ReportFindings": {
+      const input = toolUse.input as ReportFindingsInput | undefined;
+      const findings = input?.findings ?? [];
+      return {
+        title:
+          findings.length === 0
+            ? "Report findings: none found"
+            : `Report ${findings.length} finding${findings.length === 1 ? "" : "s"}`,
+        kind: "think",
+        content: findings.map((finding) => ({
+          type: "content" as const,
+          content: {
+            type: "text" as const,
+            text: `**${finding.file}${finding.line ? `:${finding.line}` : ""}** — ${finding.summary}`,
+          },
+        })),
+      };
+    }
+
    case "TaskCreate": {
      const input = toolUse.input as TaskCreateInput | undefined;
      return {