test(mode): record the plan-mode approve and keep-planning scenarios

The with-key recording session the RFC deferred. plan-mode is the 'plan'
header class's pinning scenario and necessarily carries BOTH header
shapes verbatim: the plan-shaped initial snapshot and the widened
fallback snapshot the approved exit produces mid-turn — so the suite
factory's pin guards relax from exactly-one to at-least-one header (the
classmates' uniformity anchor is the pin's FIRST header; transition
headers are legal only in the pin, matching the sandbox stack's
precedent). plan-mode-reject pins the keep-planning branch: the
corrective isError carries the reviewer's free-text feedback verbatim
and the session stays in plan mode, one header, uniform with the pin.

Recording notes, encoded in the prompts: the model is pinned to RELATIVE
paths (a recorded absolute temp path neither replays on another host nor
normalizes — the normalizers scrub the run's own cwd, not the
recording's), and the recorded model never calls a filtered tool, so the
gate's deny path stays pinned at the unit tier — that refusal is the
behavior the soft layer exists to produce. The gen-tool-catalog
meta-test pins exit_plan_mode in the harvested schema list.

docs/rfc/implemented/feature/2026-07-07-plan-mode.md

@@ -131,7 +131,7 @@ No new cordis event is declared (`mode/set` rides `session/event`; the listeners
 
 Each behind its own decision: subagent mode inheritance via a forwarded `AgentOptions.mode` (the option field itself ships), per-tool `ask` policies inside mode definitions (an OpenCode-style "bash asks in plan mode"), preset modes beyond `plan` (read-only, accept-edits), sandbox-backed bash confinement in plan mode, and the idle-record primitive if pending-intent loss proves real.
 
-The two recorded snapshot scenarios (the full plan-mode arc driving approve and keep-planning through scripted `elicitationAnswers`) await a with-key recording session; the deny and review texts are pinned at the unit tier meanwhile, and the keyless `modes-advertise` scenario pins the wire surface.
+The recorded snapshot scenarios are landed: `plan-mode` (the pinned-header arc — plan-shaped initial header, scripted elicitation approve, the in-turn flip and widened fallback header, a real edit) and `plan-mode-reject` (keep-planning feedback carried verbatim in the corrective `isError`), beside the keyless `modes-advertise` wire golden. The gate's deny path stays pinned at the unit tier — the recorded model never calls a filtered tool, which is the behavior the soft layer exists to produce.
 
 ## FAQ
 

examples/AGENTS.md

@@ -23,6 +23,6 @@ A keyless smoke that spawns the example from a temp cwd must set `TSX_TSCONFIG_P
 | `coding-agent` | `tests/keyless-smoke.e2e.ts` — boots the full real tree (dummy key, no prompt → no model call), asserts banner + clean exit; `tests/code-mode-keyless-smoke.e2e.ts` — the same boot guard for the Code Mode overlay | `tests/{full-loop,coding-task,resume,compaction,todo-write}.e2e.ts` — real model + real bash + real todo_write, world-verified; `tests/code-mode.e2e.ts` — a real model composes two bash calls in one `run_code` program; collapsed header, dispatch events, written file all verified |
 | `cordis-agent` | `tests/keyless-smoke.e2e.ts` — boots the real tree incl. `@deepseek-ai/dsh-tool-cordis` by package name; the tool logic is unit-tested in `packages/cordis/tool-cordis` | `tests/cordis-tools.e2e.ts` — real model mounts a listener (tagged line fires), builds+calls its own tool, composes two mounts via provide/inject |
 | `acp-agent` | `pnpm run test:snapshot` — boots the real ACP subprocess and replays a recorded session keyless (incl. the hook matrix: a scenario per hook point × outcome for BOTH the Claude and Codex bridges — block, deny, ask, context-fold, force-continue); `tests/acp.e2e.ts` also asserts stdout purity without a key | `tests/acp.e2e.ts` — real ACP prompt, verifies a file the agent wrote; `tests/hooks.e2e.ts` — a real `PreToolUse` hook blocks bash, verifies the file is NOT written |
-| `plan-acp-agent` | `pnpm run test:snapshot` — the session-mode wire surface as committed protocol bytes | none yet (the recorded plan-mode scenarios are the pending with-key tier) |
+| `plan-acp-agent` | `pnpm run test:snapshot` — the session-mode wire surface plus the recorded plan-mode approve/keep-planning arcs, replayed keyless | re-record the two recorded scenarios (`test:snapshot:record`) |
 
 See [the root AGENTS.md](../AGENTS.md) for repo-wide conventions and [docs/architecture.md](../docs/architecture.md) for the design.

examples/plan-acp-agent/README.md

@@ -16,4 +16,4 @@ Drive it from Zed or any ACP client; the mode picker appears on the session. Swi
 
 ## Tests
 
-`pnpm run test:snapshot` replays the keyless `modes-advertise` scenario: the `modes` advertisement on `session/new`, both `session/set_mode` round-trips with their optimistic `current_mode_update`, and the loud rejection of an unknown mode id, as committed wire bytes. The recorded plan-mode arc (explore → denied write → `exit_plan_mode` → scripted approve / keep-planning) awaits a with-key recording session; its deny/review texts are pinned at the unit tier meanwhile (`packages/mode/mode/tests`, `packages/ui/acp/tests/modes.spec.ts`).
+`pnpm run test:snapshot` replays three scenarios keyless. `modes-advertise` (authored): the `modes` advertisement on `session/new`, both `session/set_mode` round-trips with their optimistic `current_mode_update`, and the loud rejection of an unknown mode id, as committed wire bytes. `plan-mode` (recorded, the header pin): the full arc — setMode(plan), the plan-shaped initial header, the plan presented via `exit_plan_mode`, a scripted elicitation approve, the in-turn `mode/set` back and the widened fallback header, then a real edit under the restored toolset. `plan-mode-reject` (recorded): the keep-planning branch, whose corrective `isError` carries the reviewer's free-text feedback verbatim and leaves the session in plan mode. The gate's deny texts stay pinned at the unit tier (`packages/mode/mode/tests`).

examples/plan-acp-agent/tests/acp.snapshot.ts

@@ -7,23 +7,38 @@ import { defineAcpSnapshotSuite, type Scenario } from '@deepseek-ai/dsh-acp-snap
  * the sibling `cordis.snapshot.yml` replay overlay by the bin under
  * `DSH_SNAPSHOT=replay`).
  *
- * Deliberately ABSENT (pending a with-key recording session — the plan-mode
- * RFC's recorded-scenario section): the two model-turn scenarios driving the
- * full arc (setMode → explore → denied write → exit_plan_mode → a scripted
- * `elicitationAnswers` approve, and the keep-planning sibling). Their deny and
- * keep-planning texts are meanwhile pinned at the unit tier
- * (packages/mode/mode/tests) and the ACP mode round-trip in the bridge's
- * protocol tests (packages/ui/acp/tests/modes.spec.ts).
+ * The recorded scenarios re-execute the fs tools for real on replay (the
+ * replay overlay swaps only the model); their prompts pin the model to
+ * RELATIVE paths, because a recorded absolute temp path would neither replay
+ * on another host nor normalize (the normalizers scrub the RUN's own cwd,
+ * not the recording's). The gate's deny path is pinned at the unit tier
+ * (packages/mode/mode/tests) — the recorded model never calls a filtered
+ * tool, which is the behavior the soft layer exists to produce.
  */
 const SCENARIOS: Scenario[] = [
   // Protocol-only (keyless, authored): the session-mode surface this
-  // composition adds. No model turn runs, so no header pin
-  // is needed here — the pinning scenario arrives with the recorded plan-mode
-  // arc. Composition-wise it adds — availableModes/currentModeId advertised on
+  // composition adds — availableModes/currentModeId advertised on
   // session/new, the optimistic current_mode_update a session/set_mode
   // answers with, and the loud rejection of an unknown mode id — as committed
-  // wire bytes. No model turn, so it replays keyless.
+  // wire bytes. No model turn, so it replays keyless and needs no header pin.
   { name: 'modes-advertise', hasModelTurn: false, recorded: false },
+  // The full plan-mode arc, and NECESSARILY the pinned-header scenario for
+  // the 'plan' class: the first request ships the plan-shaped header (reason
+  // initial), the approved exit widens it back — a second, fallback snapshot
+  // (adding/removing exit_plan_mode resorts the canonical tool list, which
+  // the delta encoding cannot express) — so this composition's full header
+  // content, both shapes, is committed here verbatim. The arc: setMode(plan)
+  // → the model reads under the plan allowlist (it never attempts the
+  // filtered write — the deny path stays pinned at the unit tier) and
+  // presents the plan via exit_plan_mode → the scripted elicitation approves
+  // → the very next step already runs the widened toolset and writes for
+  // real, mid-turn.
+  { name: 'plan-mode', hasModelTurn: true, recorded: true, pinsHeader: true, headerClass: 'plan' },
+  // The keep-planning branch: one presentation, the scripted review answers
+  // with free-text feedback (no approval), and the corrective isError carries
+  // it back verbatim — the session stays in plan mode, so the log holds one
+  // plan-shaped header, uniform with the pin's first.
+  { name: 'plan-mode-reject', hasModelTurn: true, recorded: true, headerClass: 'plan' },
 ]
 
 defineAcpSnapshotSuite({

examples/plan-acp-agent/tests/snapshots/plan-mode-reject/input.json

@@ -0,0 +1,24 @@
+{
+  "steps": [
+    {
+      "op": "initialize"
+    },
+    {
+      "op": "newSession"
+    },
+    {
+      "op": "setMode",
+      "modeId": "plan"
+    },
+    {
+      "op": "prompt",
+      "text": "Read the file notes.txt (use the relative path notes.txt exactly, never an absolute path), then present a short plan titled '# Fix the greeting typo' via exit_plan_mode, exactly once. If the review does not approve, summarize the reviewer's feedback in plain text and end your reply - do not present the plan again."
+    }
+  ],
+  "elicitationAnswers": [
+    {
+      "action": "accept",
+      "custom": "Also add a verification step that re-reads the file after the fix."
+    }
+  ]
+}

examples/plan-acp-agent/tests/snapshots/plan-mode-reject/session.jsonl

@@ -0,0 +1,322 @@
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+{"type":"turn/start","seq":0,"time":1783625469849,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
+{"type":"mode/set","seq":1,"time":1783625469849,"data":{"mode":"plan"}}
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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" plan"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":":"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" after"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" fixing"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" typ"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"o"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":","}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" re"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"-read"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" `"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"notes"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":".txt"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"`"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" to"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" confirm"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" change"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" was"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" applied"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" correctly"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":".\n\n"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"Since"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" review"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" was"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" not"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" approved"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":","}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" I"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" will"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" not"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" present"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" plan"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" again"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"."}}}}
+{"jsonrpc":"2.0","id":4,"result":{"stopReason":"end_turn"}}

examples/plan-acp-agent/tests/snapshots/plan-mode-reject/workspace/notes.txt

@@ -0,0 +1,2 @@
+project notes
+- the greeting message still says "helo wrld"

examples/plan-acp-agent/tests/snapshots/plan-mode/input.json

@@ -0,0 +1,28 @@
+{
+  "steps": [
+    {
+      "op": "initialize"
+    },
+    {
+      "op": "newSession"
+    },
+    {
+      "op": "setMode",
+      "modeId": "plan"
+    },
+    {
+      "op": "prompt",
+      "text": "The typo is on line 2 of notes.txt itself; the workspace contains no other file. Read notes.txt (use the relative path notes.txt exactly), then present a one-step plan titled '# Fix the greeting typo' via exit_plan_mode: the single step is editing line 2 of notes.txt to say hello world. After the review approves, apply exactly that one edit to notes.txt and stop \u2014 do not look for any other file."
+    },
+    {
+      "op": "prompt",
+      "text": "Read notes.txt (relative path notes.txt) and reply with the single word DONE if line 2 now says hello world."
+    }
+  ],
+  "elicitationAnswers": [
+    {
+      "action": "accept",
+      "choice": "Approve"
+    }
+  ]
+}

examples/plan-acp-agent/tests/snapshots/plan-mode/stdout.golden.jsonl

@@ -0,0 +1,165 @@
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+{"jsonrpc":"2.0","id":2,"result":{"sessionId":"{{sessionId}}","modes":{"availableModes":[{"id":"default","name":"default"},{"id":"plan","name":"plan"}],"currentModeId":"default"}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"current_mode_update","currentModeId":"plan"}}}
+{"jsonrpc":"2.0","id":3,"result":{}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"Let"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" me"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" start"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" by"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reading"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" notes"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":".txt"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" see"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" its"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" contents"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_zv6gJBK64n6qd5FWnj4E3831","title":"Read notes.txt","kind":"read","status":"in_progress","locations":[{"path":"notes.txt","line":1}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_zv6gJBK64n6qd5FWnj4E3831","status":"completed","content":[{"type":"content","content":{"type":"text","text":"<path>{{cwd}}/notes.txt</path>\n<type>file</type>\n<content>\n1: project notes\n2: - the greeting message still says \"helo wrld\"\n\n(End of file - total 2 lines)\n</content>"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"I"}}}}
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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" says"}}}}
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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" greeting"}}}}
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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"2"}}}}
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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" say"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"hello"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" world"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_3NGaMamtLxhfkJ5sVOkC5249","title":"Fix the greeting typo","kind":"other","status":"in_progress","content":[{"type":"content","content":{"type":"text","text":"# Fix the greeting typo\n\n## Single step\n\n1. Edit line 2 of `notes.txt` (currently `- the greeting message still says \"helo wrld\"`) to say `hello world`."}}]}}}
+{"jsonrpc":"2.0","id":1,"method":"elicitation/create","params":{"sessionId":"{{sessionId}}","mode":"form","message":"Approve this plan and leave plan mode?","requestedSchema":{"type":"object","title":"Plan review","properties":{"choice":{"type":"string","title":"Approve this plan and leave plan mode?","description":"Choose one option, or fill a custom answer below.","oneOf":[{"const":"Approve","title":"Approve: Leave plan mode; the full toolset returns on the next step."},{"const":"Keep planning","title":"Keep planning: Stay in plan mode; feedback goes back to the model."}]},"custom":{"type":"string","title":"Custom answer","description":"Optional free-form answer. Leave empty to use the selected option."}},"required":[]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"current_mode_update","currentModeId":"default"}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_3NGaMamtLxhfkJ5sVOkC5249","status":"completed","content":[{"type":"content","content":{"type":"text","text":"Plan approved — plan mode exited; the full toolset returns on your next step."}}],"title":"Plan review"}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"The"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" plan"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" was"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" approved"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Now"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" I"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" need"}}}}
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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" one"}}}}
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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"`."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" I"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" need"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" replace"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" it"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" `"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"hello"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" world"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"`."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_LBpsHd1mzC2slcuzaPXV7510","title":"Edit notes.txt","kind":"edit","status":"in_progress","locations":[{"path":"notes.txt"}],"content":[{"type":"diff","path":"notes.txt","oldText":"- the greeting message still says \"helo wrld\"","newText":"hello world"}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_LBpsHd1mzC2slcuzaPXV7510","status":"completed","content":[{"type":"diff","path":"notes.txt","oldText":"project notes\n- the greeting message still says \"helo wrld\"","newText":"project notes\nhello world"}],"title":"Edit notes.txt"}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"Done"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" The"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" edit"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" was"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" applied"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" successfully"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"Done"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" Line"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" "}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"2"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" of"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" `"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"notes"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":".txt"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"`"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" now"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" reads"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" `"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"hello"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" world"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"`."}}}}
+{"jsonrpc":"2.0","id":4,"result":{"stopReason":"end_turn"}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"Let"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" me"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" read"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" file"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" verify"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_76sbXgDk9HOo5IfrRpm69608","title":"Read notes.txt","kind":"read","status":"in_progress","locations":[{"path":"notes.txt","line":1}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_76sbXgDk9HOo5IfrRpm69608","status":"completed","content":[{"type":"content","content":{"type":"text","text":"<path>{{cwd}}/notes.txt</path>\n<type>file</type>\n<content>\n1: project notes\n2: hello world\n\n(End of file - total 2 lines)\n</content>"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"Line"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" "}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"2"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" says"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"hello"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" world"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"D"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"ONE"}}}}
+{"jsonrpc":"2.0","id":5,"result":{"stopReason":"end_turn"}}

examples/plan-acp-agent/tests/snapshots/plan-mode/workspace/notes.txt

@@ -0,0 +1,2 @@
+project notes
+- the greeting message still says "helo wrld"

packages/core/tools/tests/gen-tool-catalog.spec.ts

@@ -35,7 +35,7 @@ describe('gen-tool-catalog collectToolCatalog', () => {
   it('boots every shipped tool package and harvests its model-facing schemas', async () => {
     const catalog = await collectToolCatalog()
     const names = catalog.flatMap(entry => entry.schemas.map(s => s.name)).sort()
-    expect(names).toEqual(['ask_user_question', 'bash', 'bash_kill', 'bash_output', 'cordis_inspect', 'cordis_mount', 'cordis_unmount', 'edit', 'read', 'run_code', 'subagent', 'todo_write', 'web_fetch', 'web_search', 'write'])
+    expect(names).toEqual(['ask_user_question', 'bash', 'bash_kill', 'bash_output', 'cordis_inspect', 'cordis_mount', 'cordis_unmount', 'edit', 'exit_plan_mode', 'read', 'run_code', 'subagent', 'todo_write', 'web_fetch', 'web_search', 'write'])
     // Every tool carries a JSON-Schema `parameters` object (what the model sees).
     for (const entry of catalog) {
       for (const schema of entry.schemas) {

packages/support/acp-snapshot/src/suite.ts

@@ -339,8 +339,10 @@ export function defineAcpSnapshotSuite(options: SnapshotSuiteOptions): void {
           const pinningScenario = classPin
           const pinnedFixture = await readFile(join(snapshotsDir, pinningScenario.name, 'session.jsonl'), 'utf8')
           const pinned = normalizedHeaders(pinnedFixture, fixtureContext(pinnedFixture))
-          expect(pinned.length, `the pinning fixture (${pinningScenario.name}) must carry exactly one request/header`)
-            .toBe(1)
+          // The classmates' anchor is the pin's FIRST header; a pin may carry
+          // further transition headers of its own (legal only there).
+          expect(pinned.length, `the pinning fixture (${pinningScenario.name}) must carry at least one request/header`)
+            .toBeGreaterThanOrEqual(1)
           for (const log of result.sessionLogs) {
             expect(headerDeltaCount(log.content), `session ${log.id}: a request/header-delta in a non-pinning scenario`)
               .toBe(0)
@@ -411,17 +413,17 @@ export function defineAcpSnapshotSuite(options: SnapshotSuiteOptions): void {
       }
     })
 
-    it('every pinning fixture carries exactly one request/header and no deltas', async () => {
-      // The live uniformity guard runs only in NON-pinning scenarios, so a
-      // class made of just its pinning scenario would otherwise accept a
-      // re-recorded pin with several headers or a mid-run header-delta —
-      // shapes the pin design cannot represent. Assert the committed pins
-      // directly.
+    it('every pinning fixture carries at least one request/header', async () => {
+      // The live uniformity guard runs only in NON-pinning scenarios, so the
+      // committed pins are asserted directly. A pin carries the class's full
+      // header content — INCLUDING mid-run transitions (a session-mode flip
+      // logs a second snapshot or a delta; those are legal only here, and the
+      // classmates' uniformity anchor is the pin's FIRST header) — so the
+      // shape requirement is presence, not uniqueness.
       for (const scenario of pinningByClass.values()) {
         const fixture = await readFile(join(snapshotsDir, scenario.name, 'session.jsonl'), 'utf8')
         const headers = normalizedHeaders(fixture, fixtureContext(fixture))
-        expect(headers.length, `${scenario.name}: a pinning fixture must carry exactly one request/header`).toBe(1)
-        expect(headerDeltaCount(fixture), `${scenario.name}: a pinning fixture must carry no request/header-delta`).toBe(0)
+        expect(headers.length, `${scenario.name}: a pinning fixture must carry at least one request/header`).toBeGreaterThanOrEqual(1)
       }
     })