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test(acp-agent): rewrite the continuable snapshot for the Task-free surface

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The authored transcript drove task_output, which no longer exists for a
continuable child and is not registered in this config, so the scenario hung.
It now demonstrates the RFC criteria directly: a delegation returning only the
durable subagent id, two send_message follow-ups queueing as later FIFO turns on
one inbox, an unknown id failing without delivery, and child-first disposal
despite a failed final durability checkpoint.

The snapshot-only overlay remaps the transcript's placeholder child id onto the
randomly minted live child, since the scripted model cannot know that id.

Also drops probe logging accidentally committed in cf0138258.
This commit is contained in:
Dudu-0223
2026-07-30 15:07:19 +08:00
committed by Tianyi Cui
parent c8fbc111db
commit 4435616a04
3 changed files with 126 additions and 128 deletions
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87
examples/acp-agent/tests/fixtures/subagent-durability-failure.ts vendored
View File

@@ -1,72 +1,83 @@
import type { Context } from 'cordis'
import { appendFileSync } from 'node:fs'
import { SessionId } from '@deepseek-ai/dsh-session'
export const name = 'subagent-durability-failure'
export const inject = ['sessionPersistence', 'subagents']
/**
* The authored parent transcript names the background child by a stable
* placeholder id, but the live continuable child is minted with a fresh random
* session id at run time. This snapshot-only overlay bridges that gap and forces
* a deterministic ordering plus a failing final child durability checkpoint:
*
* - `PLACEHOLDER_CHILD_ID` in a scripted `send_message` is remapped to the real
* child so both follow-ups queue onto the same live inbox in FIFO order.
* - The unknown-id `send_message` (`UNKNOWN_CHILD_ID`) resolves through a
* persistence load fenced behind both accepted follow-ups, so the transcript
* records the same order on every runner.
* - The child's final continuation turn fails its durability checkpoint with a
* fixed message, so the scenario proves child-first disposal survives a failed
* last flush.
*/
const PLACEHOLDER_CHILD_ID = '33333333-3333-4333-8333-333333333333'
const UNKNOWN_CHILD_ID = '22222222-2222-4222-8222-222222222222'
/** The child continuation turn whose durability checkpoint is forced to fail. */
const FAILED_CHECKPOINT_TURN = 4
/** Fail the child checkpoint and stabilize the authored follow-up failure ordering. */
export function apply(ctx: Context): void {
const log = (...a: unknown[]): void => {
try { appendFileSync('/tmp/probe.log', '[PROBE] ' + a.map(String).join(' ') + '\n') } catch { /* ignore */ }
}
const followupsAccepted = Promise.withResolvers<undefined>()
const persistence = ctx.sessionPersistence
const load = persistence.load.bind(persistence)
// The unavailable-child lookup is real asynchronous I/O. Fence it behind both
// authored follow-ups so runner speed cannot reorder the exact log.
persistence.load = async (id) => {
log('load', id)
if (id === UNKNOWN_CHILD_ID) { log('gating unknown-id load'); await followupsAccepted.promise; log('unknown-id load released') }
if (id === UNKNOWN_CHILD_ID) await followupsAccepted.promise
return load.call(persistence, id)
}
// Patch followup to log routing.
const subagents = ctx.subagents as unknown as { followup: (...a: unknown[]) => Promise<unknown> }
const origFollowup = subagents.followup.bind(subagents)
subagents.followup = async (...args: unknown[]) => {
log('followup childId=', args[1])
return origFollowup(...args)
}
ctx.effect(() => () => {
persistence.load = load
followupsAccepted.resolve(undefined)
}, 'subagent snapshot ordering')
// Remap the placeholder child id in a follow-up to the live child. The child
// id the model "knows" is authored into the transcript, while the running
// child is minted with a random id, so without this the follow-ups would
// never reach the live inbox.
let realChildId: string | undefined
const subagents = ctx.subagents as unknown as {
followup: (authority: unknown, childId: SessionId, content: unknown, options: unknown) => Promise<unknown>
}
const deliver = subagents.followup.bind(subagents)
subagents.followup = (authority, childId, content, options) => {
const mapped = childId === PLACEHOLDER_CHILD_ID && realChildId !== undefined
? SessionId(realChildId)
: childId
return deliver(authority, mapped, content, options)
}
// Both authored follow-ups reach the child inbox before the unknown-id lookup
// runs, so the queued FIFO order is what the transcript records. The first
// child enqueue is the initial delegation, which also pins the real child id.
let accepted = 0
ctx.on('agent/inbox/enqueue', (agent) => {
if (agent.session.header.parentSession === undefined) return
if (realChildId === undefined) realChildId = agent.session.header.id
accepted += 1
log('child enqueue #', accepted, 'child=', agent.session.header.id)
if (accepted >= 3) followupsAccepted.resolve(undefined)
})
ctx.on('subagent/start', (info: unknown) => {
log('subagent/start id=', (info as { id?: unknown }).id)
})
// The child's ordinary per-turn flushes succeed; only the final continuation
// turn's durability checkpoint fails, turning that turn/end into a durable
// error the parent never sees.
const childTurn = new WeakMap<object, number>()
ctx.on('session/event', (session, event) => {
if (session.header.parentSession === undefined) return
if (event.type === 'turn/start') log('child turn/start turn=', event.data.turn, 'child=', session.header.id)
if (event.type === 'user/message') {
const c = event.data.content?.[0]
log('child user/message text=', c && c.type === 'text' ? c.text : '?', 'child=', session.header.id)
}
if (session.header.parentSession === undefined || event.type !== 'turn/start') return
childTurn.set(session, event.data.turn)
})
const flushes = new WeakMap<object, number>()
const flushedTurnEnds = new WeakSet<object>()
ctx.on('session/flush', (session) => {
if (session.header.parentSession === undefined) return
const count = (flushes.get(session) ?? 0) + 1
flushes.set(session, count)
log('child flush #', count, 'child=', session.header.id)
if (session.events.at(-1)?.type !== 'turn/end') return
if (flushedTurnEnds.has(session)) {
log('THROW snapshot disk full')
throw new Error('snapshot disk full')
}
flushedTurnEnds.add(session)
if (childTurn.get(session) === FAILED_CHECKPOINT_TURN) throw new Error('snapshot disk full')
})
}

63
examples/acp-agent/tests/snapshots/subagent-continuable/session.1.jsonl
View File

@@ -2,39 +2,30 @@
{"type":"turn/start","seq":0,"time":1789000000001,"data":{"turn":1,"trigger":{"kind":"subagent-descriptor"}}}
{"type":"subagent/descriptor","seq":1,"time":1789000000002,"data":{"version":1,"provider":"spawn","agentProvider":"deepseek","agentModel":"deepseek-v4-flash"}}
{"type":"turn/end","seq":2,"time":1789000000003,"data":{"turn":1,"reason":{"kind":"completed"}}}
{"type":"turn/start","data":{"turn":2,"trigger":{"kind":"message","source":{"kind":"user"}}},"seq":3,"time":1789000000004}
{"type":"user/message","data":{"content":[{"type":"text","text":"Reply with exactly the word CHILD_OK and nothing else."}],"source":{"kind":"user"}},"surfaceOp":"append","seq":4,"time":1789000000005}
{"type":"step/start","data":{"turn":2,"step":1},"seq":5,"time":1789000000006}
{"type":"request/header","data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"},"seq":6,"time":1789000000007}
{"type":"assistant/chunk","data":{"turn":2,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}},"seq":7,"time":1789000000008}
{"type":"assistant/chunk","data":{"turn":2,"step":1,"chunk":{"type":"text-delta","index":0,"text":"CHILD_OK"}},"seq":8,"time":1789000000009}
{"type":"assistant/chunk","data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"CHILD_OK"}}},"seq":9,"time":1789000000010}
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{"type":"assistant/message","data":{"turn":2,"step":1,"content":[{"type":"text","text":"CHILD_OK"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":10,"outputTokens":5}},"seq":12,"time":1789000000013}
{"type":"step/end","data":{"turn":2,"step":1},"seq":13,"time":1789000000014}
{"type":"turn/end","data":{"turn":2,"reason":{"kind":"completed"}},"seq":14,"time":1789000000015}
{"type":"turn/start","data":{"turn":3,"trigger":{"kind":"message","source":{"kind":"coordinator","senderSessionId":"11111111-1111-4111-8111-111111111111"}}},"seq":15,"time":1789000000016}
{"type":"user/message","data":{"content":[{"type":"text","text":"Now reply with exactly SECOND_OK."}],"source":{"kind":"coordinator","senderSessionId":"11111111-1111-4111-8111-111111111111"}},"surfaceOp":"append","seq":16,"time":1789000000017}
{"type":"step/start","data":{"turn":3,"step":1},"seq":17,"time":1789000000018}
{"type":"request/header","data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"},"seq":18,"time":1789000000019}
{"type":"assistant/chunk","data":{"turn":3,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}},"seq":19,"time":1789000000020}
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{"type":"turn/end","data":{"turn":3,"reason":{"kind":"completed"}},"seq":26,"time":1789000000027}
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{"type":"user/message","data":{"content":[{"type":"text","text":"Now reply with exactly THIRD_OK."}],"source":{"kind":"coordinator","senderSessionId":"11111111-1111-4111-8111-111111111111"}},"surfaceOp":"append","seq":28,"time":1789000000029}
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{"type":"request/header","data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"},"seq":30,"time":1789000000031}
{"type":"assistant/chunk","data":{"turn":4,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}},"seq":31,"time":1789000000032}
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{"type":"assistant/message","data":{"turn":4,"step":1,"content":[{"type":"text","text":"THIRD_OK"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":10,"outputTokens":5}},"seq":36,"time":1789000000037}
{"type":"step/end","data":{"turn":4,"step":1},"seq":37,"time":1789000000038}
{"type":"turn/end","data":{"turn":4,"reason":{"kind":"error","step":1,"message":"snapshot disk full"}},"seq":38,"time":1789000000039}
{"type":"turn/start","seq":3,"time":1789000000004,"data":{"turn":2,"trigger":{"kind":"message","source":{"kind":"user"}}}}
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{"type":"session/title","seq":5,"time":1789000000005,"data":{"title":"Reply with exactly the word","messageSeqs":[4],"source":{"kind":"fallback"}}}
{"type":"step/start","seq":6,"time":1789000000006,"data":{"turn":2,"step":1}}
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{"type":"step/end","seq":25,"time":1785394678743,"data":{"turn":3,"step":1}}
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{"type":"user/message","seq":28,"time":1785394678756,"data":{"content":[{"type":"text","text":"Now reply with exactly THIRD_OK."}],"source":{"kind":"coordinator","senderSessionId":"11111111-1111-4111-8111-111111111111"}},"surfaceOp":"append"}
{"type":"turn/end","seq":29,"time":1785394678762,"data":{"turn":4,"reason":{"kind":"error","step":1,"message":"snapshot disk full"}}}

104
examples/acp-agent/tests/snapshots/subagent-continuable/session.jsonl
View File

@@ -1,58 +1,54 @@
{"type":"session","version":0,"id":"11111111-1111-4111-8111-111111111111","createdAt":1789000000000,"cwd":"/tmp/subagent-continuable","delegationDepth":0}
{"type":"turn/start","seq":0,"time":1789000000001,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
{"type":"user/message","seq":1,"time":1789000000002,"data":{"content":[{"type":"text","text":"Follow these steps exactly, then stop. 1. Call the subagent tool once with run_in_background set to true, description 'Reply with CHILD_OK', and prompt 'Reply with exactly the word CHILD_OK and nothing else.'. 2. Collect its result with task_output using the task id from the acknowledgement and wait: true. 3. Call send_message with subagent_id exactly '22222222-2222-4222-8222-222222222222' (a subagent that does not exist) and message 'Please continue.'. 4. Collect the task it started with task_output and wait: true, and observe that it failed. 5. Reply with the single word DONE. Do not use the bash tool."}],"source":{"kind":"user"}},"surfaceOp":"append"}
{"type":"user/message","seq":1,"time":1789000000002,"data":{"content":[{"type":"text","text":"Follow these steps exactly, then stop. 1. Call the subagent tool once with run_in_background set to true, description 'Reply with CHILD_OK', and prompt 'Reply with exactly the word CHILD_OK and nothing else.'. 2. Call send_message twice in a row, both with the subagent id from step 1: first with message 'Now reply with exactly SECOND_OK.', then with message 'Now reply with exactly THIRD_OK.'. 3. Call send_message with subagent_id exactly '22222222-2222-4222-8222-222222222222' (a subagent that does not exist) and message 'Please continue.', and observe that it fails. 4. Reply with the single word DONE. Do not use the bash tool."}],"source":{"kind":"user"}},"surfaceOp":"append"}
{"type":"session/title","seq":2,"time":1789000000003,"data":{"title":"Follow these steps exactly, then","messageSeqs":[1],"source":{"kind":"fallback"}}}
{"type":"step/start","data":{"turn":1,"step":1},"seq":3,"time":1789000000004}
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{"type":"request/header","seq":4,"time":1789000000005,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
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{"type":"tool/call","data":{"turn":1,"step":1,"callId":"call_bg_start","name":"subagent","arguments":"{\"description\": \"Reply with CHILD_OK\", \"prompt\": \"Reply with exactly the word CHILD_OK and nothing else.\", \"run_in_background\": true}"},"seq":11,"time":1789000000012}
{"type":"tool/result","data":{"turn":1,"step":1,"callId":"call_bg_start","content":[{"type":"text","text":"started subagent 33333333-3333-4333-8333-333333333333"}]},"seq":12,"time":1789000000013}
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{"type":"tool/result","data":{"turn":1,"step":2,"callId":"call_followup_1","content":[{"type":"text","text":"message queued as the next turn for subagent 33333333-3333-4333-8333-333333333333"}]},"seq":23,"time":1789000000024}
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