refactor(hooks): tighten the hook-protocol contract surface
Implement the tighten-hook-protocol-contract RFC (moved to implemented/): - HookDialect narrows to 'claude' | 'codex': the 'native' variant had zero producers (native plugins on the seams write no hook/* provenance), and the dialect is defined as the bridge that ran the hook. - HookOutput.suppressOutput is gone: the codec parsed it and every path discarded it with no warn and no deferral — hook stdout never enters a transcript, so there is nothing to suppress. - hook/result.durationMs is gone: durable timing telemetry with no reader that the snapshot normalizer had to scrub as replay noise. With no duration to measure, runHook loses its injected now clock and the single-field RunHookResult wrapper — it returns the HookOutput directly. The committed hook fixtures had the field stripped mechanically (field-only diff); the stdout goldens never carried it. - The bridges' double-defaulted defaultTimeoutMs config knob is replaced by one reference-default constant, DEFAULT_HOOK_TIMEOUT_MS, exported from the lib's runner and applied inside runHook; per-hook timeoutSec stays the override surface. - The hook/result semantics move into the lib that declares the event: HookResultRecord now carries the decoded HookOutput and appendHookResult derives the decision string (decision ?? stop-on-continue:false ?? pass) and the 500-char stderrSummary truncation; both bridges delete their byte-identical private copies. The snapshot suite passes against the existing goldens, proving the derived values are unchanged. - Rider: BLOCKING_EXIT_CODE is codec-internal again (zero importers). Amend the hook-protocol-lib and hook-snapshot-matrix RFCs to the new facts, update the lib/bridge READMEs and the session.md event tables, and retarget the affected unit tests (including new lib-level coverage of the derivation rules).
This commit is contained in:
Tianyi Cui
@@ -38,13 +38,12 @@ describe('parseHookOutput — exit code semantics', () => {
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})
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describe('parseHookOutput — structured stdout (exit 0 only)', () => {
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it('parses top-level continue/stopReason/suppressOutput/systemMessage', () => {
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it('parses top-level continue/stopReason/systemMessage', () => {
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const out = parseHookOutput(0, JSON.stringify({
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continue: false, stopReason: 'budget exceeded', suppressOutput: true, systemMessage: 'heads up',
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continue: false, stopReason: 'budget exceeded', systemMessage: 'heads up',
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}), '')
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expect(out.continue).toBe(false)
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expect(out.stopReason).toBe('budget exceeded')
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expect(out.suppressOutput).toBe(true)
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expect(out.systemMessage).toBe('heads up')
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})
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@@ -1,6 +1,11 @@
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import { describe, expect, it } from 'vitest'
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import { Session, SessionId } from '@deepseek-ai/dsh-session'
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import { appendHookInvoked, appendHookResult } from '@deepseek-ai/dsh-hook-protocol'
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import { appendHookInvoked, appendHookResult, type HookOutput } from '@deepseek-ai/dsh-hook-protocol'
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/** A {@link HookOutput} with the required stream fields defaulted. */
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function output(over: Partial<HookOutput> = {}): HookOutput {
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return { exitCode: 0, stderr: '', stdout: '', ...over }
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}
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describe('hook/* session events', () => {
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it('appendHookInvoked records a log-only hook/invoked (with matcher when present)', () => {
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@@ -18,7 +23,7 @@ describe('hook/* session events', () => {
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it('omits matcher when absent (match-all hook)', () => {
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const session = new Session(SessionId('s'))
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appendHookInvoked(session, { turn: 2, point: 'Stop', dialect: 'native', handlerId: 'h2' })
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appendHookInvoked(session, { turn: 2, point: 'Stop', dialect: 'codex', handlerId: 'h2' })
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const ev = [...session.events].find(e => e.type === 'hook/invoked')
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if (ev?.type === 'hook/invoked') {
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@@ -26,32 +31,72 @@ describe('hook/* session events', () => {
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}
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})
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it('appendHookResult records the decided outcome, omitting absent optionals', () => {
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it('appendHookResult derives decision/exitCode/stderrSummary from the output', () => {
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const session = new Session(SessionId('s'))
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appendHookResult(session, {
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turn: 1, point: 'PreToolUse', handlerId: 'h1', decision: 'deny',
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exitCode: 2, stderrSummary: 'blocked', durationMs: 12,
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turn: 1, point: 'PreToolUse', handlerId: 'h1',
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output: output({ exitCode: 2, stderr: 'blocked', decision: 'deny' }),
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})
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const full = [...session.events].find(e => e.type === 'hook/result')
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if (full?.type === 'hook/result') {
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expect(full.data).toMatchObject({ turn: 1, point: 'PreToolUse', handlerId: 'h1', decision: 'deny', exitCode: 2, stderrSummary: 'blocked', durationMs: 12 })
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expect(full.data).toEqual({ turn: 1, point: 'PreToolUse', handlerId: 'h1', decision: 'deny', exitCode: 2, stderrSummary: 'blocked' })
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}
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// A result with no exit code / no stderr (e.g. a hook that could not run) omits both keys.
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const session2 = new Session(SessionId('s2'))
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appendHookResult(session2, { turn: 1, point: 'Stop', handlerId: 'h3', decision: 'allow', durationMs: 3 })
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appendHookResult(session2, {
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turn: 1, point: 'Stop', handlerId: 'h3',
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output: output({ exitCode: undefined, decision: 'allow' }),
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})
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const sparse = [...session2.events].find(e => e.type === 'hook/result')
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if (sparse?.type === 'hook/result') {
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expect('exitCode' in sparse.data).toBe(false)
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expect('stderrSummary' in sparse.data).toBe(false)
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expect(sparse.data.durationMs).toBe(3)
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expect(sparse.data.decision).toBe('allow')
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}
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})
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it('the decision falls back to stop on continue:false, else pass', () => {
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const session = new Session(SessionId('s'))
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appendHookResult(session, { turn: 1, point: 'Stop', handlerId: 'halt', output: output({ continue: false }) })
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appendHookResult(session, { turn: 1, point: 'Stop', handlerId: 'noop', output: output() })
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// An explicit decision wins over the continue:false fallback.
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appendHookResult(session, { turn: 1, point: 'Stop', handlerId: 'both', output: output({ continue: false, decision: 'block' }) })
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const decisions = [...session.events]
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.filter(e => e.type === 'hook/result')
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.map(e => e.type === 'hook/result' ? [e.data.handlerId, e.data.decision] : [])
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expect(decisions).toEqual([['halt', 'stop'], ['noop', 'pass'], ['both', 'block']])
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})
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it('stderrSummary is trimmed and truncated to 500 characters with an ellipsis', () => {
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const session = new Session(SessionId('s'))
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appendHookResult(session, {
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turn: 1, point: 'PreToolUse', handlerId: 'long',
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output: output({ exitCode: 2, stderr: ` ${'x'.repeat(600)} ` }),
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})
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const ev = [...session.events].find(e => e.type === 'hook/result')
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if (ev?.type === 'hook/result') {
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expect(ev.data.stderrSummary).toBe('x'.repeat(500) + '…')
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}
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})
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it('a 500-character stderr is kept verbatim (the cap is exclusive)', () => {
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const session = new Session(SessionId('s'))
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appendHookResult(session, {
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turn: 1, point: 'PreToolUse', handlerId: 'edge',
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output: output({ exitCode: 2, stderr: 'y'.repeat(500) }),
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})
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const ev = [...session.events].find(e => e.type === 'hook/result')
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if (ev?.type === 'hook/result') {
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expect(ev.data.stderrSummary).toBe('y'.repeat(500))
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}
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})
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it('an invoked/result pair correlates by handlerId', () => {
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const session = new Session(SessionId('s'))
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appendHookInvoked(session, { turn: 1, point: 'PreToolUse', dialect: 'claude', handlerId: 'pair-1' })
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appendHookResult(session, { turn: 1, point: 'PreToolUse', handlerId: 'pair-1', decision: 'allow', exitCode: 0, durationMs: 7 })
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appendHookResult(session, { turn: 1, point: 'PreToolUse', handlerId: 'pair-1', output: output({ decision: 'allow' }) })
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const invoked = [...session.events].find(e => e.type === 'hook/invoked')
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const result = [...session.events].find(e => e.type === 'hook/result')
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@@ -1,6 +1,6 @@
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import { describe, expect, it } from 'vitest'
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import type { BashExecRequest, BashExecSpec, BashExecutor, BashRunResult } from '@deepseek-ai/dsh-bash'
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import { runHook } from '@deepseek-ai/dsh-hook-protocol'
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import { DEFAULT_HOOK_TIMEOUT_MS, runHook } from '@deepseek-ai/dsh-hook-protocol'
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/**
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* A minimal stand-in for the bits of {@link BashExecutor} that {@link runHook}
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@@ -49,23 +49,20 @@ function result(over: Partial<BashRunResult> = {}): BashRunResult {
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}
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}
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const clock = () => { let t = 0; return () => (t += 5) } // +5ms per call → duration 5
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describe('runHook — payload + env + stdin plumbing', () => {
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it('serializes the payload to stdin (with trailing newline when requested)', async () => {
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const { bash, specs } = recordingBash(async () => result({ stdout: { text: '', truncated: false } }))
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await runHook(bash, { command: 'my-hook.sh' }, {
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payload: { hook_event_name: 'PreToolUse', tool_name: 'Bash' },
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defaultTimeoutMs: 60000,
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trailingNewline: true,
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}, clock())
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})
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expect(specs[0]!.stdin).toBe(JSON.stringify({ hook_event_name: 'PreToolUse', tool_name: 'Bash' }) + '\n')
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expect(specs[0]!.command).toBe('my-hook.sh')
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})
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it('omits the trailing newline when trailingNewline is false (Codex)', async () => {
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const { bash, specs } = recordingBash(async () => result())
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await runHook(bash, { command: 'h' }, { payload: { a: 1 }, defaultTimeoutMs: 1000, trailingNewline: false }, clock())
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await runHook(bash, { command: 'h' }, { payload: { a: 1 }, trailingNewline: false })
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expect(specs[0]!.stdin).toBe('{"a":1}')
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})
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@@ -73,46 +70,46 @@ describe('runHook — payload + env + stdin plumbing', () => {
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const { bash, specs } = recordingBash(async () => result())
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await runHook(bash, { command: 'h' }, {
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payload: {}, env: { CLAUDE_PROJECT_DIR: '/proj' }, cwd: '/work',
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defaultTimeoutMs: 1000, trailingNewline: true,
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}, clock())
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trailingNewline: true,
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})
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expect(specs[0]!.env).toEqual({ CLAUDE_PROJECT_DIR: '/proj' })
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expect(specs[0]!.workdir).toBe('/work')
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})
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it('a per-hook timeoutSec (seconds) overrides the default (ms)', async () => {
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it('a per-hook timeoutSec (seconds) overrides the reference default', async () => {
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const { bash, specs } = recordingBash(async () => result())
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await runHook(bash, { command: 'h', timeoutSec: 3 }, { payload: {}, defaultTimeoutMs: 60000, trailingNewline: true }, clock())
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await runHook(bash, { command: 'h', timeoutSec: 3 }, { payload: {}, trailingNewline: true })
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expect(specs[0]!.timeoutMs).toBe(3000)
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})
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it('falls back to the default timeout when the hook sets none', async () => {
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it('falls back to DEFAULT_HOOK_TIMEOUT_MS when the hook sets none', async () => {
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const { bash, specs } = recordingBash(async () => result())
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await runHook(bash, { command: 'h' }, { payload: {}, defaultTimeoutMs: 60000, trailingNewline: true }, clock())
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expect(specs[0]!.timeoutMs).toBe(60000)
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await runHook(bash, { command: 'h' }, { payload: {}, trailingNewline: true })
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expect(specs[0]!.timeoutMs).toBe(DEFAULT_HOOK_TIMEOUT_MS)
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expect(DEFAULT_HOOK_TIMEOUT_MS).toBe(600_000) // the CC/Codex reference default (10 minutes)
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})
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it('passes the abort signal through', async () => {
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const controller = new AbortController()
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const { bash, specs } = recordingBash(async () => result())
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await runHook(bash, { command: 'h' }, { payload: {}, signal: controller.signal, defaultTimeoutMs: 1000, trailingNewline: true }, clock())
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await runHook(bash, { command: 'h' }, { payload: {}, signal: controller.signal, trailingNewline: true })
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expect(specs[0]!.signal).toBe(controller.signal)
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})
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})
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describe('runHook — outcome decoding + duration', () => {
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it('decodes a clean exit with structured stdout and reports a duration', async () => {
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describe('runHook — outcome decoding', () => {
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it('decodes a clean exit with structured stdout', async () => {
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const { bash } = recordingBash(async () => result({
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exitCode: 0, stdout: { text: JSON.stringify({ decision: 'block', reason: 'no' }), truncated: false },
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}))
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const { output, durationMs } = await runHook(bash, { command: 'h' }, { payload: {}, defaultTimeoutMs: 1000, trailingNewline: true }, clock())
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const output = await runHook(bash, { command: 'h' }, { payload: {}, trailingNewline: true })
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expect(output.decision).toBe('block')
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expect(output.reason).toBe('no')
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expect(durationMs).toBe(5)
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})
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it('a signal death (exitCode null) decodes as undefined exit (non-blocking error)', async () => {
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const { bash } = recordingBash(async () => result({ exitCode: null, signal: 'SIGKILL', stderr: { text: 'killed', truncated: false } }))
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const { output } = await runHook(bash, { command: 'h' }, { payload: {}, defaultTimeoutMs: 1000, trailingNewline: true }, clock())
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const output = await runHook(bash, { command: 'h' }, { payload: {}, trailingNewline: true })
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expect(output.exitCode).toBeUndefined()
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expect(output.decision).toBeUndefined()
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expect(output.stderr).toBe('killed')
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@@ -120,7 +117,7 @@ describe('runHook — outcome decoding + duration', () => {
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it('an executor rejection (infra fault) becomes a non-blocking error, never throws', async () => {
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const { bash } = recordingBash(async () => { throw new Error('bad workdir: ENOENT') })
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const { output } = await runHook(bash, { command: 'h' }, { payload: {}, defaultTimeoutMs: 1000, trailingNewline: true }, clock())
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const output = await runHook(bash, { command: 'h' }, { payload: {}, trailingNewline: true })
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expect(output.exitCode).toBeUndefined()
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expect(output.stderr).toBe('bad workdir: ENOENT')
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expect(output.decision).toBeUndefined()
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@@ -128,7 +125,7 @@ describe('runHook — outcome decoding + duration', () => {
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it('a non-Error rejection is stringified onto stderr', async () => {
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const { bash } = recordingBash(async () => { throw 'plain string fault' })
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const { output } = await runHook(bash, { command: 'h' }, { payload: {}, defaultTimeoutMs: 1000, trailingNewline: true }, clock())
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const output = await runHook(bash, { command: 'h' }, { payload: {}, trailingNewline: true })
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expect(output.stderr).toBe('plain string fault')
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})
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@@ -137,9 +134,9 @@ describe('runHook — outcome decoding + duration', () => {
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exitCode: 0,
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stdout: { text: JSON.stringify({ hookSpecificOutput: { hookEventName: 'PreToolUse', permissionDecision: 'deny' } }), truncated: false },
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}))
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const { output } = await runHook(bash, { command: 'h' }, {
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payload: {}, defaultTimeoutMs: 1000, trailingNewline: true, expectedEventName: 'Stop',
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}, clock())
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const output = await runHook(bash, { command: 'h' }, {
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payload: {}, trailingNewline: true, expectedEventName: 'Stop',
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})
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// A PreToolUse block on a Stop hook is malformed → its decision is discarded.
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expect(output.hookEventName).toBe('PreToolUse')
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expect(output.decision).toBeUndefined()
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