test(acp-example): five snapshot scenarios + cancel/error input ops

Adds the first cut of snapshot scenarios, each asserting a normalized stdout
transcript golden and (for model turns) a re-persisted session-log golden:

- text-turn, tool-call-turn, multi-turn: RECORDED against the real API — the
  committed session.jsonl is a genuine harvested log; replay derives the model
  script from it and reproduces deterministically with no key. tool-call-turn
  exercises the real bash executor (echo SNAPSHOT_OK → tool/call + tool/result
  + a post-tool answer step).
- error-finish, cancel: AUTHORED via a replay.override.json sidecar (the live
  API can't be coaxed into a deterministic 401 or mid-stream cancel). error-
  finish replays a {kind:throw} 401 → the bridge answers the prompt with a
  JSON-RPC error and the log records turn/end{kind:error}; cancel replays a
  {kind:hang} → stopReason:cancelled.

Two input-DSL ops support these: promptExpectError (awaits the prompt, asserts
it rejects — the editor's view of a failed turn — and swallows it) and
promptAndCancel (dispatches the prompt unawaited, waits until the client
OBSERVES the streamed agent_message_chunk, then cancels — pinning frame order
so the cancel transcript is deterministic; fixes a flake Codex caught where the
late chunk and the cancelled response could interleave either way).

Scenarios carry a `recorded` flag so test:snapshot:record only re-runs the
live-API ones. reasoning/max-tokens scenarios are deferred (hard to force
deterministically from the live model). Per docs/rfc/implemented/2026-06-19.

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

@@ -20,20 +20,35 @@ import { type NormalizeContext, normalizeSessionLog, normalizeStdout } from './s
 const SNAPSHOTS_DIR = join(dirname(fileURLToPath(import.meta.url)), 'snapshots')
 const RECORDING = process.env.DSH_SNAPSHOT === 'record'
 
-/** A scenario and whether it makes any model call (→ has a behavioral JSONL golden). */
+/** A snapshot scenario and how its fixtures are produced. */
 interface Scenario {
   name: string
   /** Whether the scenario drives at least one model turn (so a JSONL golden applies). */
   hasModelTurn: boolean
+  /**
+   * Whether `test:snapshot:record` regenerates this scenario's `session.jsonl`
+   * from the LIVE API. `recorded` scenarios are model-driven and reproducible;
+   * `authored` scenarios (a hand-written `replay.override.json` sidecar drives
+   * replay — e.g. a provider error or a cancel, which the live API can't be
+   * coaxed into deterministically) are NEVER re-recorded.
+   */
+  recorded: boolean
 }
 
 const SCENARIOS: Scenario[] = [
-  { name: 'handshake', hasModelTurn: false },
+  { name: 'handshake', hasModelTurn: false, recorded: false },
+  { name: 'text-turn', hasModelTurn: true, recorded: true },
+  { name: 'tool-call-turn', hasModelTurn: true, recorded: true },
+  { name: 'multi-turn', hasModelTurn: true, recorded: true },
+  { name: 'error-finish', hasModelTurn: true, recorded: false },
+  { name: 'cancel', hasModelTurn: true, recorded: false },
 ]
 
 for (const scenario of SCENARIOS) {
   describe(`snapshot: ${scenario.name}`, () => {
-    it('matches the stdout transcript golden', async () => {
+    // In RECORD mode, only re-run the `recorded` (live-API) scenarios; the
+    // `authored` ones (sidecar-driven errors/cancel) are never re-recorded.
+    it.skipIf(RECORDING && !scenario.recorded)('matches the goldens', async () => {
       const dir = join(SNAPSHOTS_DIR, scenario.name)
       const input = JSON.parse(await readFile(join(dir, 'input.json'), 'utf8')) as InputScript
       const overrideFile = join(dir, 'replay.override.json')
@@ -48,10 +63,10 @@ for (const scenario of SCENARIOS) {
         cwd: result.cwd,
       }
 
-      // RECORD mode: persist the freshly-harvested log back to the scenario's
-      // session.jsonl fixture (a model scenario must produce one). `--update`
-      // refreshes the Vitest goldens but NOT this fixture, so write it here.
-      if (RECORDING && scenario.hasModelTurn) {
+      // RECORD mode (recorded scenarios only): persist the freshly-harvested log
+      // back to the scenario's session.jsonl fixture. `--update` refreshes the
+      // Vitest goldens but NOT this fixture, so write it here.
+      if (RECORDING && scenario.recorded && scenario.hasModelTurn) {
         expect(result.sessionLog, 'record produced no session log to harvest').toBeDefined()
         await writeFile(join(dir, 'session.jsonl'), result.sessionLog as string)
       }

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

@@ -44,11 +44,19 @@ const repoTsconfig = fileURLToPath(new URL('../../../tsconfig.json', import.meta
  * harness interprets these in order. `newSession` captures the server-issued
  * (random) session id into a `{{sessionId}}` variable that later steps
  * reference, since a committed file cannot know the id in advance.
+ *
+ * `promptAndCancel` sends a prompt WITHOUT awaiting its response, waits until
+ * the client observes the first streamed `agent_message_chunk` (so the emitted
+ * frames deterministically precede the cancellation), then cancels the turn —
+ * the only way to exercise a cancel deterministically (a plain `prompt` step
+ * awaits the response, which a cancel/hang scenario would block on forever).
  */
 type InputStep =
   | { op: 'initialize'; terminalOutput?: boolean }
   | { op: 'newSession' }
   | { op: 'prompt'; text: string }
+  | { op: 'promptExpectError'; text: string }
+  | { op: 'promptAndCancel'; text: string }
   | { op: 'cancel' }
 
 /** A scenario's `input.json`: an ordered list of input steps. */
@@ -122,8 +130,23 @@ export async function runScenario(input: InputScript, opts: RunOptions): Promise
     Writable.toWeb(child.stdin) as WritableStream<Uint8Array>,
     Readable.toWeb(passthrough) as ReadableStream<Uint8Array>,
   )
+  // Watcher so a step can block until the client OBSERVES a particular
+  // session/update — used by promptAndCancel to pin frame order (send cancel
+  // only after the streamed agent_message_chunk has arrived, so those frames
+  // deterministically precede the cancelled prompt response).
+  const updateWaiters: { match: (u: SessionNotification['update']) => boolean; resolve: () => void }[] = []
+  const waitForUpdate = (match: (u: SessionNotification['update']) => boolean): Promise<void> =>
+    new Promise<void>(resolve => updateWaiters.push({ match, resolve }))
+
   const makeClient = (_agent: AcpAgent): Client => ({
-    sessionUpdate(_params: SessionNotification): Promise<void> {
+    sessionUpdate(params: SessionNotification): Promise<void> {
+      for (let i = updateWaiters.length - 1; i >= 0; i--) {
+        const waiter = updateWaiters[i]
+        if (waiter !== undefined && waiter.match(params.update)) {
+          updateWaiters.splice(i, 1)
+          waiter.resolve()
+        }
+      }
       return Promise.resolve()
     },
     requestPermission(_params: RequestPermissionRequest): Promise<RequestPermissionResponse> {
@@ -136,7 +159,7 @@ export async function runScenario(input: InputScript, opts: RunOptions): Promise
   let sessionLog: string | undefined
   try {
     for (const step of input.steps) {
-      await runStep(client, step, cwd, () => sessionId, (id) => { sessionId = id })
+      await runStep(client, step, cwd, waitForUpdate, () => sessionId, (id) => { sessionId = id })
     }
     // Done driving: close stdin so the server disposes gracefully (flushing
     // persistence) and exits. Then await exit so the harvested log is complete.
@@ -170,6 +193,7 @@ async function runStep(
   client: ClientSideConnection,
   step: InputStep,
   cwd: string,
+  waitForUpdate: (match: (u: SessionNotification['update']) => boolean) => Promise<void>,
   getSessionId: () => string | undefined,
   setSessionId: (id: string) => void,
 ): Promise<void> {
@@ -191,6 +215,34 @@ async function runStep(
       await client.prompt({ sessionId, prompt: [{ type: 'text', text: step.text }] })
       return
     }
+    case 'promptExpectError': {
+      const sessionId = getSessionId()
+      if (sessionId === undefined) throw new Error('snapshot-harness: promptExpectError before newSession')
+      // The model fails this turn (a recorded provider error), so the bridge
+      // answers the prompt with a JSON-RPC error and the SDK rejects. That
+      // rejection IS the expected editor experience — swallow it so the run
+      // completes and the stdout transcript (the error frame) is captured.
+      await client.prompt({ sessionId, prompt: [{ type: 'text', text: step.text }] })
+        .then(() => { throw new Error('snapshot-harness: expected the prompt to fail but it succeeded') },
+          () => { /* expected: the turn failed and the bridge returned an error */ })
+      return
+    }
+    case 'promptAndCancel': {
+      const sessionId = getSessionId()
+      if (sessionId === undefined) throw new Error('snapshot-harness: promptAndCancel before newSession')
+      // Dispatch the prompt WITHOUT awaiting (a hang fixture never resolves on
+      // its own). To pin frame order deterministically, wait until the client
+      // has OBSERVED the hang's streamed agent_message_chunk before cancelling —
+      // so those update frames always precede the cancelled prompt response in
+      // the transcript (without this, the late chunk and the response race; see
+      // the Codex review of commit 5). Then cancel and await the prompt, which
+      // the bridge settles as `cancelled` once the abort propagates.
+      const promptDone = client.prompt({ sessionId, prompt: [{ type: 'text', text: step.text }] })
+      await waitForUpdate(u => u.sessionUpdate === 'agent_message_chunk')
+      await client.cancel({ sessionId })
+      await promptDone
+      return
+    }
     case 'cancel': {
       const sessionId = getSessionId()
       if (sessionId === undefined) throw new Error('snapshot-harness: cancel before newSession')

examples/acp-agent/tests/snapshots/cancel/input.json

@@ -0,0 +1,7 @@
+{
+  "steps": [
+    { "op": "initialize" },
+    { "op": "newSession" },
+    { "op": "promptAndCancel", "text": "Start a long task; this turn will be cancelled mid-stream." }
+  ]
+}

examples/acp-agent/tests/snapshots/cancel/replay.override.json

@@ -0,0 +1,3 @@
+[
+  { "kind": "hang" }
+]

examples/acp-agent/tests/snapshots/cancel/session.golden.txt

@@ -0,0 +1,95 @@
+{
+  "type": "session",
+  "version": 1,
+  "id": "{{sessionId}}",
+  "createdAt": 0,
+  "cwd": "{{cwd}}"
+}
+{
+  "type": "turn/start",
+  "seq": 0,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "trigger": {
+      "kind": "message",
+      "source": {
+        "kind": "user"
+      }
+    }
+  }
+}
+{
+  "type": "user/message",
+  "seq": 1,
+  "time": 0,
+  "data": {
+    "content": [
+      {
+        "type": "text",
+        "text": "Start a long task; this turn will be cancelled mid-stream."
+      }
+    ],
+    "source": {
+      "kind": "user"
+    }
+  }
+}
+{
+  "type": "step/start",
+  "seq": 2,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 3,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "block-start",
+      "index": 0,
+      "blockType": "text"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 4,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "text-delta",
+      "index": 0,
+      "text": "partial"
+    }
+  }
+}
+{
+  "type": "step/end",
+  "seq": 5,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1
+  }
+}
+{
+  "type": "turn/end",
+  "seq": 6,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "reason": {
+      "kind": "aborted",
+      "reason": "session/cancel"
+    }
+  }
+}

examples/acp-agent/tests/snapshots/cancel/session.jsonl

@@ -0,0 +1 @@
+{"type":"session","version":1,"id":"00000000-0000-0000-0000-000000000000","createdAt":0}

examples/acp-agent/tests/snapshots/cancel/stdout.golden.txt

@@ -0,0 +1,62 @@
+{
+  "jsonrpc": "2.0",
+  "id": 1,
+  "result": {
+    "protocolVersion": 1,
+    "agentInfo": {
+      "name": "deepseek-harness-acp",
+      "version": "0.0.1"
+    },
+    "agentCapabilities": {
+      "loadSession": true,
+      "promptCapabilities": {
+        "image": false,
+        "audio": false,
+        "embeddedContext": false
+      }
+    },
+    "authMethods": []
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "id": 2,
+  "result": {
+    "sessionId": "{{sessionId}}"
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "user_message_chunk",
+      "content": {
+        "type": "text",
+        "text": "Start a long task; this turn will be cancelled mid-stream."
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_message_chunk",
+      "content": {
+        "type": "text",
+        "text": "partial"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "id": 3,
+  "result": {
+    "stopReason": "cancelled"
+  }
+}

examples/acp-agent/tests/snapshots/error-finish/input.json

@@ -0,0 +1,7 @@
+{
+  "steps": [
+    { "op": "initialize" },
+    { "op": "newSession" },
+    { "op": "promptExpectError", "text": "This prompt triggers a recorded provider error." }
+  ]
+}

examples/acp-agent/tests/snapshots/error-finish/replay.override.json

@@ -0,0 +1,3 @@
+[
+  { "kind": "throw", "chunks": [], "message": "simulated provider error (HTTP 401)", "code": "AUTH", "status": 401 }
+]

examples/acp-agent/tests/snapshots/error-finish/session.golden.txt

@@ -0,0 +1,79 @@
+{
+  "type": "session",
+  "version": 1,
+  "id": "{{sessionId}}",
+  "createdAt": 0,
+  "cwd": "{{cwd}}"
+}
+{
+  "type": "turn/start",
+  "seq": 0,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "trigger": {
+      "kind": "message",
+      "source": {
+        "kind": "user"
+      }
+    }
+  }
+}
+{
+  "type": "user/message",
+  "seq": 1,
+  "time": 0,
+  "data": {
+    "content": [
+      {
+        "type": "text",
+        "text": "This prompt triggers a recorded provider error."
+      }
+    ],
+    "source": {
+      "kind": "user"
+    }
+  }
+}
+{
+  "type": "step/start",
+  "seq": 2,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1
+  }
+}
+{
+  "type": "step/end",
+  "seq": 3,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1
+  }
+}
+{
+  "type": "error",
+  "seq": 4,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "message": "simulated provider error (HTTP 401)",
+    "code": "AUTH"
+  }
+}
+{
+  "type": "turn/end",
+  "seq": 5,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "reason": {
+      "kind": "error",
+      "message": "simulated provider error (HTTP 401)",
+      "code": "AUTH"
+    }
+  }
+}

examples/acp-agent/tests/snapshots/error-finish/session.jsonl

@@ -0,0 +1 @@
+{"type":"session","version":1,"id":"00000000-0000-0000-0000-000000000000","createdAt":0}

examples/acp-agent/tests/snapshots/error-finish/stdout.golden.txt

@@ -0,0 +1,49 @@
+{
+  "jsonrpc": "2.0",
+  "id": 1,
+  "result": {
+    "protocolVersion": 1,
+    "agentInfo": {
+      "name": "deepseek-harness-acp",
+      "version": "0.0.1"
+    },
+    "agentCapabilities": {
+      "loadSession": true,
+      "promptCapabilities": {
+        "image": false,
+        "audio": false,
+        "embeddedContext": false
+      }
+    },
+    "authMethods": []
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "id": 2,
+  "result": {
+    "sessionId": "{{sessionId}}"
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "user_message_chunk",
+      "content": {
+        "type": "text",
+        "text": "This prompt triggers a recorded provider error."
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "id": 3,
+  "error": {
+    "code": -32603,
+    "message": "Internal error: turn failed: simulated provider error (HTTP 401)"
+  }
+}

examples/acp-agent/tests/snapshots/multi-turn/input.json

@@ -0,0 +1,8 @@
+{
+  "steps": [
+    { "op": "initialize" },
+    { "op": "newSession" },
+    { "op": "prompt", "text": "Reply with exactly the word: ONE. No tools." },
+    { "op": "prompt", "text": "Reply with exactly the word: TWO. No tools." }
+  ]
+}

examples/acp-agent/tests/snapshots/multi-turn/session.golden.txt

@@ -0,0 +1,929 @@
+{
+  "type": "session",
+  "version": 1,
+  "id": "{{sessionId}}",
+  "createdAt": 0,
+  "cwd": "{{cwd}}"
+}
+{
+  "type": "turn/start",
+  "seq": 0,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "trigger": {
+      "kind": "message",
+      "source": {
+        "kind": "user"
+      }
+    }
+  }
+}
+{
+  "type": "user/message",
+  "seq": 1,
+  "time": 0,
+  "data": {
+    "content": [
+      {
+        "type": "text",
+        "text": "Reply with exactly the word: ONE. No tools."
+      }
+    ],
+    "source": {
+      "kind": "user"
+    }
+  }
+}
+{
+  "type": "step/start",
+  "seq": 2,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 3,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "block-start",
+      "index": 0,
+      "blockType": "reasoning"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 4,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": "The"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 5,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " user"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 6,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " wants"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 7,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " me"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 8,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " to"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 9,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " reply"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 10,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " with"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 11,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " exactly"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 12,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " the"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 13,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " word"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 14,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " \""
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 15,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": "ONE"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 16,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": "\""
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 17,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " and"
+    }
+  }
+}
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+{"type":"assistant/chunk","seq":51,"time":1781811973507,"data":{"turn":2,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" no"}}}
+{"type":"assistant/chunk","seq":52,"time":1781811973507,"data":{"turn":2,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" tools"}}}
+{"type":"assistant/chunk","seq":53,"time":1781811973507,"data":{"turn":2,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"."}}}
+{"type":"assistant/chunk","seq":54,"time":1781811973507,"data":{"turn":2,"step":1,"chunk":{"type":"block-start","index":1,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":55,"time":1781811973508,"data":{"turn":2,"step":1,"chunk":{"type":"text-delta","index":1,"text":"T"}}}
+{"type":"assistant/chunk","seq":56,"time":1781811973542,"data":{"turn":2,"step":1,"chunk":{"type":"text-delta","index":1,"text":"WO"}}}
+{"type":"assistant/chunk","seq":57,"time":1781811973543,"data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The user wants me to reply with exactly the word \"TWO\" and use no tools."}}}}
+{"type":"assistant/chunk","seq":58,"time":1781811973543,"data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"TWO"}}}}
+{"type":"assistant/chunk","seq":59,"time":1781811973543,"data":{"turn":2,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":129,"outputTokens":22,"cacheReadTokens":768,"reasoningTokens":19}}}}
+{"type":"assistant/chunk","seq":60,"time":1781811973543,"data":{"turn":2,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":61,"time":1781811973543,"data":{"turn":2,"step":1,"content":[{"type":"reasoning","text":"The user wants me to reply with exactly the word \"TWO\" and use no tools."},{"type":"text","text":"TWO"}]}}
+{"type":"usage","seq":62,"time":1781811973543,"data":{"turn":2,"step":1,"usage":{"inputTokens":129,"outputTokens":22,"cacheReadTokens":768,"reasoningTokens":19}}}
+{"type":"step/end","seq":63,"time":1781811973543,"data":{"turn":2,"step":1}}
+{"type":"turn/end","seq":64,"time":1781811973543,"data":{"turn":2,"reason":{"kind":"completed"}}}

examples/acp-agent/tests/snapshots/multi-turn/stdout.golden.txt

@@ -0,0 +1,615 @@
+{
+  "jsonrpc": "2.0",
+  "id": 1,
+  "result": {
+    "protocolVersion": 1,
+    "agentInfo": {
+      "name": "deepseek-harness-acp",
+      "version": "0.0.1"
+    },
+    "agentCapabilities": {
+      "loadSession": true,
+      "promptCapabilities": {
+        "image": false,
+        "audio": false,
+        "embeddedContext": false
+      }
+    },
+    "authMethods": []
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "id": 2,
+  "result": {
+    "sessionId": "{{sessionId}}"
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "user_message_chunk",
+      "content": {
+        "type": "text",
+        "text": "Reply with exactly the word: ONE. No tools."
+      }
+    }
+  }
+}
+{
+  "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": " user"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": " wants"
+      }
+    }
+  }
+}
+{
+  "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": " to"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": " reply"
+      }
+    }
+  }
+}
+{
+  "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": " exactly"
+      }
+    }
+  }
+}
+{
+  "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": " word"
+      }
+    }
+  }
+}
+{
+  "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": "ONE"
+      }
+    }
+  }
+}
+{
+  "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": " and"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": " no"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": " tools"
+      }
+    }
+  }
+}
+{
+  "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": "ONE"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "id": 3,
+  "result": {
+    "stopReason": "end_turn"
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "user_message_chunk",
+      "content": {
+        "type": "text",
+        "text": "Reply with exactly the word: TWO. No tools."
+      }
+    }
+  }
+}
+{
+  "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": " user"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": " wants"
+      }
+    }
+  }
+}
+{
+  "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": " to"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": " reply"
+      }
+    }
+  }
+}
+{
+  "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": " exactly"
+      }
+    }
+  }
+}
+{
+  "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": " word"
+      }
+    }
+  }
+}
+{
+  "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": "T"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": "WO"
+      }
+    }
+  }
+}
+{
+  "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": " and"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": " use"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": " no"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": " tools"
+      }
+    }
+  }
+}
+{
+  "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": "T"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_message_chunk",
+      "content": {
+        "type": "text",
+        "text": "WO"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "id": 4,
+  "result": {
+    "stopReason": "end_turn"
+  }
+}

examples/acp-agent/tests/snapshots/text-turn/input.json

@@ -0,0 +1,7 @@
+{
+  "steps": [
+    { "op": "initialize" },
+    { "op": "newSession" },
+    { "op": "prompt", "text": "Reply with exactly the word: PONG. Do not use any tools." }
+  ]
+}

examples/acp-agent/tests/snapshots/text-turn/session.golden.txt

@@ -0,0 +1,489 @@
+{
+  "type": "session",
+  "version": 1,
+  "id": "{{sessionId}}",
+  "createdAt": 0,
+  "cwd": "{{cwd}}"
+}
+{
+  "type": "turn/start",
+  "seq": 0,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "trigger": {
+      "kind": "message",
+      "source": {
+        "kind": "user"
+      }
+    }
+  }
+}
+{
+  "type": "user/message",
+  "seq": 1,
+  "time": 0,
+  "data": {
+    "content": [
+      {
+        "type": "text",
+        "text": "Reply with exactly the word: PONG. Do not use any tools."
+      }
+    ],
+    "source": {
+      "kind": "user"
+    }
+  }
+}
+{
+  "type": "step/start",
+  "seq": 2,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 3,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "block-start",
+      "index": 0,
+      "blockType": "reasoning"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 4,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": "The"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 5,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " user"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 6,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " wants"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 7,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
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+      "index": 0,
+      "text": " me"
+    }
+  }
+}
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+  "seq": 8,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
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+      "text": " to"
+    }
+  }
+}
+{
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+  "seq": 9,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
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+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " reply"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 10,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
+      "type": "reasoning-delta",
+      "index": 0,
+      "text": " with"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 11,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
+    "chunk": {
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+      "text": " exactly"
+    }
+  }
+}
+{
+  "type": "assistant/chunk",
+  "seq": 12,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
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+}
+{
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+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1,
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+}
+{
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+  "time": 0,
+  "data": {
+    "turn": 1,
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+      "text": " \""
+    }
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+}
+{
+  "type": "assistant/chunk",
+  "seq": 15,
+  "time": 0,
+  "data": {
+    "turn": 1,
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+      "text": "P"
+    }
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+}
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+        "text": "The user wants me to reply with exactly the word \"PONG\" without using any tools."
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+}
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+        "text": "The user wants me to reply with exactly the word \"PONG\" without using any tools."
+      },
+      {
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+        "text": "PONG"
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+}
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+    }
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+}

examples/acp-agent/tests/snapshots/text-turn/session.jsonl

@@ -0,0 +1,35 @@
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+{"type":"turn/start","seq":0,"time":1781811940519,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
+{"type":"user/message","seq":1,"time":1781811940519,"data":{"content":[{"type":"text","text":"Reply with exactly the word: PONG. Do not use any tools."}],"source":{"kind":"user"}}}
+{"type":"step/start","seq":2,"time":1781811940520,"data":{"turn":1,"step":1}}
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+{"type":"assistant/chunk","seq":10,"time":1781811941134,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" with"}}}
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+{"type":"assistant/chunk","seq":15,"time":1781811941167,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"P"}}}
+{"type":"assistant/chunk","seq":16,"time":1781811941167,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"ONG"}}}
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+{"type":"assistant/chunk","seq":24,"time":1781811941233,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":1,"text":"P"}}}
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+{"type":"assistant/chunk","seq":26,"time":1781811941234,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The user wants me to reply with exactly the word \"PONG\" without using any tools."}}}}
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+{"type":"turn/end","seq":33,"time":1781811941236,"data":{"turn":1,"reason":{"kind":"completed"}}}

examples/acp-agent/tests/snapshots/text-turn/stdout.golden.txt

@@ -0,0 +1,342 @@
+{
+  "jsonrpc": "2.0",
+  "id": 1,
+  "result": {
+    "protocolVersion": 1,
+    "agentInfo": {
+      "name": "deepseek-harness-acp",
+      "version": "0.0.1"
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+      "promptCapabilities": {
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+        "audio": false,
+        "embeddedContext": false
+      }
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+    "authMethods": []
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "id": 2,
+  "result": {
+    "sessionId": "{{sessionId}}"
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
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+      "content": {
+        "type": "text",
+        "text": "Reply with exactly the word: PONG. Do not use any tools."
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
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+      "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": " user"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": " wants"
+      }
+    }
+  }
+}
+{
+  "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": " to"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": " reply"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
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+      "content": {
+        "type": "text",
+        "text": " with"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
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+    "sessionId": "{{sessionId}}",
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+      "content": {
+        "type": "text",
+        "text": " exactly"
+      }
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+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
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+        "type": "text",
+        "text": " the"
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+}
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+  "jsonrpc": "2.0",
+  "method": "session/update",
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+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": " word"
+      }
+    }
+  }
+}
+{
+  "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": "P"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": "ONG"
+      }
+    }
+  }
+}
+{
+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
+      "sessionUpdate": "agent_thought_chunk",
+      "content": {
+        "type": "text",
+        "text": "\""
+      }
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+}
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+  "jsonrpc": "2.0",
+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
+    "update": {
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+      "content": {
+        "type": "text",
+        "text": " without"
+      }
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+}
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+  "method": "session/update",
+  "params": {
+    "sessionId": "{{sessionId}}",
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+      "content": {
+        "type": "text",
+        "text": " using"
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+}
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+      "content": {
+        "type": "text",
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+}
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+  "jsonrpc": "2.0",
+  "method": "session/update",
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+      "content": {
+        "type": "text",
+        "text": "."
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+}
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+  "jsonrpc": "2.0",
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+      "content": {
+        "type": "text",
+        "text": "P"
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+}
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+  "jsonrpc": "2.0",
+  "method": "session/update",
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+    "update": {
+      "sessionUpdate": "agent_message_chunk",
+      "content": {
+        "type": "text",
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+      }
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+  }
+}
+{
+  "jsonrpc": "2.0",
+  "id": 3,
+  "result": {
+    "stopReason": "end_turn"
+  }
+}

examples/acp-agent/tests/snapshots/tool-call-turn/input.json

@@ -0,0 +1,7 @@
+{
+  "steps": [
+    { "op": "initialize" },
+    { "op": "newSession" },
+    { "op": "prompt", "text": "Use the bash tool to run exactly: echo SNAPSHOT_OK. Then reply with the single word DONE and stop." }
+  ]
+}

examples/acp-agent/tests/snapshots/tool-call-turn/session.golden.txt

@@ -0,0 +1,1469 @@
+{
+  "type": "session",
+  "version": 1,
+  "id": "{{sessionId}}",
+  "createdAt": 0,
+  "cwd": "{{cwd}}"
+}
+{
+  "type": "turn/start",
+  "seq": 0,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "trigger": {
+      "kind": "message",
+      "source": {
+        "kind": "user"
+      }
+    }
+  }
+}
+{
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+  "seq": 1,
+  "time": 0,
+  "data": {
+    "content": [
+      {
+        "type": "text",
+        "text": "Use the bash tool to run exactly: echo SNAPSHOT_OK. Then reply with the single word DONE and stop."
+      }
+    ],
+    "source": {
+      "kind": "user"
+    }
+  }
+}
+{
+  "type": "step/start",
+  "seq": 2,
+  "time": 0,
+  "data": {
+    "turn": 1,
+    "step": 1
+  }
+}
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+}
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examples/acp-agent/tests/snapshots/tool-call-turn/stdout.golden.txt

@@ -0,0 +1,723 @@
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+}
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