feat(acp-example): per-scenario workspace/ seeding + a real file-edit scenario

Establishes the standard way to give a snapshot scenario a non-empty starting
workspace: an optional `<scenario>/workspace/` directory whose contents the
harness copies into the temp cwd before the run (for both record and replay),
so the agent's bash tools see the seeded files. The cwd is normalized in the
goldens, so seeded paths stay stable.

The new `workspace-edit` scenario demonstrates the full read→write→verify cycle
on a seeded file: it ships `workspace/greeting.txt` ("hello"), prompts the agent
to append a WORLD line and cat it back. The recorded log captures the real bash
edits (`echo WORLD >> greeting.txt`, then `cat` showing `hello\nWORLD`), and it
replays deterministically with no key.

Also hardens runScenario teardown (Codex review): workspace seeding and spawn
now run inside the try whose finally removes both temp dirs, so a seeding/spawn
failure can't leak them. Documents the convention in the RFC + example README.
This commit is contained in:
Tianyi Cui
2026-06-19 10:01:42 +08:00
parent 679aaacfc4
commit 76fceae5b3
9 changed files with 972 additions and 65 deletions

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@@ -74,6 +74,6 @@ The replay plugin lives at `examples/acp-agent/src/llm-replay.ts`, referenced fr
## Consequences
A new test tier and its fixtures to maintain: each scenario is a directory of `input.json` (the client stdin script) + `session.jsonl` (the recorded log) + an optional `replay.override.json` + the two `*.golden` files, committed and reviewed. Re-recording when the model's phrasing changes churns the goldens — visible in review, which is the point of committing them. Bought: deterministic, keyless, full-transcript regression coverage that boots the real Loader (so it still guards the export-shape bug class), exercises the real bash executor, and gives a one-command accept-the-diff loop. The tier is ACP-first but the harness (subprocess + tee + input-DSL + normalization + JSONL-derived replay) is example-agnostic and extends to other examples.
A new test tier and its fixtures to maintain: each scenario is a directory of `input.json` (the client stdin script) + `session.jsonl` (the recorded log) + an optional `replay.override.json` + an optional `workspace/` seed dir + the two `*.golden.jsonl` files, committed and reviewed. A scenario that needs the agent to operate on existing files (read, edit, grep) ships a `<scenario>/workspace/` directory; the harness copies its contents into the temp cwd before the run, so the seeded files are present for both record and replay (the cwd is normalized in the goldens, so the seeded paths stay stable). Re-recording when the model's phrasing changes churns the goldens — visible in review, which is the point of committing them. Bought: deterministic, keyless, full-transcript regression coverage that boots the real Loader (so it still guards the export-shape bug class), exercises the real bash executor, and gives a one-command accept-the-diff loop. The tier is ACP-first but the harness (subprocess + tee + input-DSL + workspace seeding + normalization + JSONL-derived replay) is example-agnostic and extends to other examples.
This RFC relates to but does not supersede the [proposed determinism RFC](../proposed/2026-06-11-deterministic-and-stress-testing.md): that proposal's "universal replay fixture" re-derives session *message history* after every test (an internal-consistency invariant), whereas snapshot tests pin the *external protocol output*. They are complementary — one guards the event-sourcing invariant, the other guards the editor-facing contract.

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@@ -32,7 +32,7 @@ The editor sets each session's `cwd` to the project it opens; the agent's bash t
## Snapshot tests (record-once / replay-deterministic)
This example is the home of the harness's **snapshot tests** — they boot this server as a real subprocess, drive it with a deterministic input script, and diff its normalized output against committed golden files. The model is made deterministic by `src/llm-replay.ts`, a function/namespace plugin that installs an `llm/stream` waterfall listener and short-circuits it, serving model streams reconstructed from a recorded **session JSONL** fixture (`<scenario>/session.jsonl`) — so replay needs no API key. The fixture IS the persisted session log: its `assistant/chunk` events carry every `StreamChunk`, so grouping them by `(turn, step)` reconstructs each `stream()` call (one model call per loop step). Recording is therefore "run the real agent once and harvest the `.jsonl`". The two failure modes not expressible as logged chunks — a pure throw before any chunk, and cancel/hang — use an optional `<scenario>/replay.override.json` sidecar (a `ReplayEntry[]` that replaces the derived script). See [docs/rfc/implemented/2026-06-19-acp-snapshot-tests.md](../../docs/rfc/implemented/2026-06-19-acp-snapshot-tests.md) for the full design.
This example is the home of the harness's **snapshot tests** — they boot this server as a real subprocess, drive it with a deterministic input script, and diff its normalized output against committed golden files. The model is made deterministic by `src/llm-replay.ts`, a function/namespace plugin that installs an `llm/stream` waterfall listener and short-circuits it, serving model streams reconstructed from a recorded **session JSONL** fixture (`<scenario>/session.jsonl`) — so replay needs no API key. The fixture IS the persisted session log: its `assistant/chunk` events carry every `StreamChunk`, so grouping them by `(turn, step)` reconstructs each `stream()` call (one model call per loop step). Recording is therefore "run the real agent once and harvest the `.jsonl`". The two failure modes not expressible as logged chunks — a pure throw before any chunk, and cancel/hang — use an optional `<scenario>/replay.override.json` sidecar (a `ReplayEntry[]` that replaces the derived script). A scenario that needs the agent to operate on existing files ships an optional `<scenario>/workspace/` directory — the harness copies its contents into the temp cwd before the run (see `workspace-edit`). See [docs/rfc/implemented/2026-06-19-acp-snapshot-tests.md](../../docs/rfc/implemented/2026-06-19-acp-snapshot-tests.md) for the full design.
## MVP limitations

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@@ -39,6 +39,7 @@ const SCENARIOS: Scenario[] = [
{ name: 'handshake', hasModelTurn: false, recorded: false },
{ name: 'text-turn', hasModelTurn: true, recorded: true },
{ name: 'tool-call-turn', hasModelTurn: true, recorded: true },
{ name: 'workspace-edit', hasModelTurn: true, recorded: true },
{ name: 'multi-turn', hasModelTurn: true, recorded: true },
{ name: 'error-finish', hasModelTurn: true, recorded: false },
{ name: 'cancel', hasModelTurn: true, recorded: false },
@@ -52,10 +53,12 @@ for (const scenario of SCENARIOS) {
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')
const workspaceDir = join(dir, 'workspace')
const result = await runScenario(input, {
mode: RECORDING ? 'record' : 'replay',
fixtureFile: join(dir, 'session.jsonl'),
...existsSync(overrideFile) ? { overrideFile } : {},
...existsSync(workspaceDir) ? { workspaceDir } : {},
})
const ctx: NormalizeContext = {

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@@ -14,7 +14,8 @@
*/
import { spawn, type ChildProcessWithoutNullStreams } from 'node:child_process'
import { mkdtemp, readFile, readdir, rm } from 'node:fs/promises'
import { cp, mkdtemp, readFile, readdir, rm } from 'node:fs/promises'
import { existsSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { fileURLToPath } from 'node:url'
@@ -85,6 +86,13 @@ interface RunOptions {
fixtureFile: string
/** Optional sidecar override path (replay). */
overrideFile?: string
/**
* Optional `<scenario>/workspace/` directory whose contents are copied into
* the temp cwd BEFORE the run — the standard way to seed files the agent
* operates on (a file to read, edit, or grep). Absent for scenarios that
* start from an empty workspace.
*/
workspaceDir?: string
}
/**
@@ -95,69 +103,79 @@ interface RunOptions {
export async function runScenario(input: InputScript, opts: RunOptions): Promise<RunResult> {
const cwd = await mkdtemp(join(tmpdir(), 'acp-snap-cwd-'))
const sessionsRoot = await mkdtemp(join(tmpdir(), 'acp-snap-sessions-'))
const env: NodeJS.ProcessEnv = {
...process.env,
TSX_TSCONFIG_PATH: repoTsconfig,
DSH_SNAPSHOT: opts.mode,
DSH_SNAPSHOT_FILE: opts.fixtureFile,
DSH_SNAPSHOT_SESSIONS_ROOT: sessionsRoot,
...opts.overrideFile !== undefined ? { DSH_SNAPSHOT_OVERRIDE: opts.overrideFile } : {},
}
const child: ChildProcessWithoutNullStreams = spawn(
process.execPath,
['--import', tsxLoader, startScript],
{ cwd, env, stdio: ['pipe', 'pipe', 'pipe'] },
)
const rawBuffers: Buffer[] = []
const stderrChunks: string[] = []
child.stderr.setEncoding('utf8')
child.stderr.on('data', (c: string) => stderrChunks.push(c))
// Tee raw stdout: accumulate the bytes for the golden + purity check, and ALSO
// feed the same bytes to the SDK client through a passthrough. Buffer the raw
// bytes (not per-chunk utf8 strings) and decode once at the end, so a
// multibyte sequence split across two 'data' events can't corrupt the golden.
const passthrough = new Readable({ read() {} })
child.stdout.on('data', (buf: Buffer) => {
rawBuffers.push(buf)
passthrough.push(buf)
})
child.stdout.on('end', () => passthrough.push(null))
const stream = ndJsonStream(
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> {
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> {
return Promise.resolve({ outcome: { outcome: 'cancelled' } })
},
})
const client = new ClientSideConnection(makeClient, stream)
// Everything past the temp-dir creation runs under a try/finally that always
// removes both dirs — so a failure in workspace seeding, spawn, or any step
// never leaks them (the "e2e tests own their resources" rule).
let child: ChildProcessWithoutNullStreams | undefined
let sessionId: string | undefined
let sessionLog: string | undefined
const rawBuffers: Buffer[] = []
const stderrChunks: string[] = []
try {
// Seed the workspace if the scenario ships one (a file the agent reads/edits).
// Copied into the temp cwd so the agent's bash tools see it; the goldens
// normalize the cwd, so the seeded paths stay stable across runs.
if (opts.workspaceDir !== undefined && existsSync(opts.workspaceDir)) {
await cp(opts.workspaceDir, cwd, { recursive: true })
}
const env: NodeJS.ProcessEnv = {
...process.env,
TSX_TSCONFIG_PATH: repoTsconfig,
DSH_SNAPSHOT: opts.mode,
DSH_SNAPSHOT_FILE: opts.fixtureFile,
DSH_SNAPSHOT_SESSIONS_ROOT: sessionsRoot,
...opts.overrideFile !== undefined ? { DSH_SNAPSHOT_OVERRIDE: opts.overrideFile } : {},
}
child = spawn(
process.execPath,
['--import', tsxLoader, startScript],
{ cwd, env, stdio: ['pipe', 'pipe', 'pipe'] },
)
child.stderr.setEncoding('utf8')
child.stderr.on('data', (c: string) => stderrChunks.push(c))
// Tee raw stdout: accumulate the bytes for the golden + purity check, and ALSO
// feed the same bytes to the SDK client through a passthrough. Buffer the raw
// bytes (not per-chunk utf8 strings) and decode once at the end, so a
// multibyte sequence split across two 'data' events can't corrupt the golden.
const passthrough = new Readable({ read() {} })
child.stdout.on('data', (buf: Buffer) => {
rawBuffers.push(buf)
passthrough.push(buf)
})
child.stdout.on('end', () => passthrough.push(null))
const stream = ndJsonStream(
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> {
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> {
return Promise.resolve({ outcome: { outcome: 'cancelled' } })
},
})
const client = new ClientSideConnection(makeClient, stream)
for (const step of input.steps) {
await runStep(client, step, cwd, waitForUpdate, () => sessionId, (id) => { sessionId = id })
}
@@ -170,8 +188,9 @@ export async function runScenario(input: InputScript, opts: RunOptions): Promise
if (sessionLogPath !== undefined) sessionLog = await readFile(sessionLogPath, 'utf8')
} finally {
// Failure-safe teardown: kill a still-running child and drop the temp dirs
// even if a step/harvest threw, so a flaky run never leaks a process or dir.
if (child.exitCode === null && child.signalCode === null) {
// even if seeding/spawn/a step/harvest threw, so a flaky run never leaks a
// process or dir. `child` is undefined only if spawn itself threw.
if (child !== undefined && child.exitCode === null && child.signalCode === null) {
child.kill('SIGKILL')
await waitForExit(child)
}

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@@ -0,0 +1,7 @@
{
"steps": [
{ "op": "initialize" },
{ "op": "newSession" },
{ "op": "prompt", "text": "A file named greeting.txt in the current directory contains one word. Use the bash tool to append a second line containing the word WORLD to it (so it has two lines), then read the file back with `cat greeting.txt` to confirm, and reply with the single word DONE. Use a single bash call per action." }
]
}

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@@ -0,0 +1,331 @@
{"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":"A file named greeting.txt in the current directory contains one word. Use the bash tool to append a second line containing the word WORLD to it (so it has two lines), then read the file back with `cat greeting.txt` to confirm, and reply with the single word DONE. Use a single bash call per action."}],"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":"Let"}}}
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