fix(hooks): never echo stdin on strict-output Stop events - #2796
fix(hooks): never echo stdin on strict-output Stop events#2796Noah-TaeHwan wants to merge 2 commits into
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On current Claude Code, every Stop with a disabled or no-opinion hook surfaces "invalid stop hook JSON output": the harness parses Stop stdout strictly as hook-output JSON, and the passthrough convention echoes the stdin payload back. affaan-m#2222/affaan-m#2227 suppressed only the truncated-echo case; sub-cap payloads still echoed on every turn stop. Treat Stop/SubagentStop as strict-output events at the harness boundary: - run-with-flags.js: no-opinion fallthroughs (disabled hook, dry-run, missing args, missing script, run() error) and hook results that echo stdin verbatim emit empty stdout for strict events; other events keep the existing passthrough behavior. - plugin-hook-bootstrap.js: same contract for the bootstrap fallbacks and child-stdout forwarding. - hooks/hooks.json: Stop lifecycle wrapper fallbacks finish('') instead of finish(raw); the SessionEnd fallback no longer echoes stdin. - tests: stop-hooks-stdout wrapper expectations now assert empty stdout at the boundary (direct-invocation echo conventions unchanged); run-with-flags-truncation gains a disabled-Stop regression test and an opinionated-output preservation test. Full suite: 3914/3918 (4 pre-existing state-store failures unrelated). Co-Authored-By: Claude Fable 5 <[email protected]> Co-authored-by: Orca <[email protected]>
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**/*.{js,ts,jsx,tsx,py,java,cs,rb,go,php,swift,kt,rs,c,cpp,h,hpp}📄 CodeRabbit inference engine (.cursor/rules/common-security.md)
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**/*.{js,ts,jsx,tsx,py,java,cs,rb,go,php}📄 CodeRabbit inference engine (.cursor/rules/common-security.md)
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**/*.{js,ts,jsx,tsx,py,java,cs,rb,go,php,sql}📄 CodeRabbit inference engine (.cursor/rules/common-security.md)
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**/*.{js,ts,jsx,tsx,html,php,java,cs,rb,go}📄 CodeRabbit inference engine (.cursor/rules/common-security.md)
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**/*.{js,ts,jsx,tsx,py,java,cs,rb,go,php,swift,kt,rs,c,cpp,h,hpp,properties,yml,yaml,json,env,config}📄 CodeRabbit inference engine (.cursor/rules/common-security.md)
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**/*.{js,ts,jsx,tsx,json,env*}📄 CodeRabbit inference engine (.github/copilot-instructions.md)
Files:
**/*.{js,ts}📄 CodeRabbit inference engine (.github/copilot-instructions.md)
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**/*.{jsx,tsx,js,ts}📄 CodeRabbit inference engine (.github/copilot-instructions.md)
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**/*.{js,ts,env*}📄 CodeRabbit inference engine (.github/copilot-instructions.md)
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**/*📄 CodeRabbit inference engine (.cursor/rules/common-performance.md)
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**/*.{js,jsx,ts,tsx,py,java,kt,go,rs,cpp,h,cs,rb,php}📄 CodeRabbit inference engine (AGENTS.md)
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**/*.{test,spec}.{js,jsx,ts,tsx,py,java,kt,go,rs}📄 CodeRabbit inference engine (AGENTS.md)
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{package.json,*.config.js,scripts/**/*.js}📄 CodeRabbit inference engine (CLAUDE.md)
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scripts/**/*.js📄 CodeRabbit inference engine (CLAUDE.md)
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{scripts,bin}/**⚙️ CodeRabbit configuration file
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🧠 Learnings (4)📚 Learning: 2026-06-27T23:49:19.839ZApplied to files:
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🔇 Additional comments (3)
📝 WalkthroughSummary by CodeRabbit
WalkthroughStop and SubagentStop hooks now suppress raw input passthrough when strict JSON output is required. Registered wrappers emit empty stdout when runners are unavailable or produce no output. Tests cover valid output, disabled hooks, large payloads, multibyte input, and exit statuses. ChangesStrict hook output handling
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change limits no-opinion output suppression to strict Stop events while preserving passthrough behavior for other hook events, with targeted regression coverage. No actionable merge-blocking risk remains beyond normal checks. Sequence Diagram(s)sequenceDiagram
participant HookInput
participant HookRunner
participant RegisteredWrapper
participant ChildHook
HookInput->>HookRunner: provide hook payload
HookRunner->>HookRunner: detect Stop or SubagentStop
HookRunner->>RegisteredWrapper: run hook with strict output handling
RegisteredWrapper->>ChildHook: invoke configured hook
ChildHook-->>RegisteredWrapper: valid JSON, echoed input, or no output
RegisteredWrapper-->>HookRunner: valid JSON or empty output
HookRunner-->>HookInput: return strict hook output
Possibly related issues
Possibly related PRs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@tests/hooks/run-with-flags-truncation.test.js`:
- Around line 110-121: Parameterize the opinionated-output test in
tests/hooks/run-with-flags-truncation.test.js#L110-L121 for Stop and
SubagentStop, asserting valid hook JSON remains unchanged. Add direct
plugin-hook-bootstrap strict-event fallback and echoed child-stdout cases in
tests/hooks/stop-hooks-stdout.test.js#L153-L196, asserting echoed input produces
empty stdout while valid hook output is preserved.
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📓 Path-based instructions (20)
**/*.{js,ts,jsx,tsx,py,java,cs,go,rb,php,scala,kt}
📄 CodeRabbit inference engine (.cursor/rules/common-coding-style.md)
**/*.{js,ts,jsx,tsx,py,java,cs,go,rb,php,scala,kt}: Always create new objects, never mutate existing ones. Use immutable patterns to prevent hidden side effects and enable safe concurrency
Organize code into many small files (200-400 lines typical, 800 lines max) organized by feature/domain rather than by type
Always handle errors explicitly at every level and never silently swallow errors
Always validate all user input before processing at system boundaries
Use schema-based validation where available
Fail fast with clear error messages when validation fails
Never trust external data (API responses, user input, file content)
Ensure code is readable and well-named
Keep functions small (less than 50 lines)
Keep files focused (less than 800 lines)
Avoid deep nesting (more than 4 levels)
Do not use hardcoded values; use constants or configuration instead
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*.{js,ts,jsx,tsx,py,java,cs,rb,go,php,swift,kt,rs,c,cpp,h,hpp}
📄 CodeRabbit inference engine (.cursor/rules/common-security.md)
No hardcoded secrets (API keys, passwords, tokens) - validate before any commit
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*.{js,ts,jsx,tsx,py,java,cs,rb,go,php}
📄 CodeRabbit inference engine (.cursor/rules/common-security.md)
**/*.{js,ts,jsx,tsx,py,java,cs,rb,go,php}: All user inputs must be validated
Enable CSRF protection on all state-changing endpoints
Verify authentication and authorization for all protected endpoints
Implement rate limiting on all endpoints to prevent abuse
Ensure error messages do not leak sensitive data in responses
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*.{js,ts,jsx,tsx,py,java,cs,rb,go,php,sql}
📄 CodeRabbit inference engine (.cursor/rules/common-security.md)
Use parameterized queries to prevent SQL injection
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*.{js,ts,jsx,tsx,html,php,java,cs,rb,go}
📄 CodeRabbit inference engine (.cursor/rules/common-security.md)
Implement XSS prevention by sanitizing HTML output
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*.{js,ts,jsx,tsx,py,java,cs,rb,go,php,swift,kt,rs,c,cpp,h,hpp,properties,yml,yaml,json,env,config}
📄 CodeRabbit inference engine (.cursor/rules/common-security.md)
NEVER hardcode secrets in source code - ALWAYS use environment variables or a secret manager
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jshooks/hooks.jsonscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*.{ts,tsx,js,jsx}
📄 CodeRabbit inference engine (.cursor/rules/typescript-coding-style.md)
**/*.{ts,tsx,js,jsx}: Use spread operator for immutable updates in TypeScript/JavaScript instead of direct mutation
Use async/await with try-catch for error handling in TypeScript/JavaScript
Use Zod for schema-based input validation in TypeScript/JavaScript
No console.log statements in production code; use proper logging libraries instead
**/*.{ts,tsx,js,jsx}: Auto-format JavaScript/TypeScript files using Prettier after edit
Warn aboutconsole.logstatements in edited files
Check all modified files forconsole.logstatements before session ends
**/*.{ts,tsx,js,jsx}: Use the ApiResponse interface pattern with generic type parameter:interface ApiResponse<T> { success: boolean; data?: T; error?: string; meta?: { total: number; page: number; limit: number; } }
Implement custom React hooks following the pattern: export a named function with use prefix, generic type parameters, and proper useEffect cleanup for side effects
**/*.{ts,tsx,js,jsx}: Never hardcode secrets; always use environment variables for sensitive credentials like API keys
Throw an error when required environment variables are not configured to fail fast and ensure security prerequisites are metUse Playwright as the E2E testing framework for critical user flows in TypeScript/JavaScript
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*.{test,spec}.{js,ts,jsx,tsx}
📄 CodeRabbit inference engine (.github/copilot-instructions.md)
**/*.{test,spec}.{js,ts,jsx,tsx}: Write tests before implementation (test-driven development); target 80%+ coverage
Achieve minimum 80% test coverage across all three layers: Unit, Integration, and E2E
Use AAA structure (Arrange / Act / Assert) in tests with descriptive test names that explain behavior under test
Files:
tests/hooks/run-with-flags-truncation.test.jstests/hooks/stop-hooks-stdout.test.js
**/*.{js,ts,jsx,tsx}
📄 CodeRabbit inference engine (.github/copilot-instructions.md)
**/*.{js,ts,jsx,tsx}: Always create new objects and never mutate in place; return new copies instead
Keep files between 200–400 lines typical, with a maximum of 800 lines
Extract helpers when a file exceeds 200 lines
Handle errors explicitly at every level; never swallow errors silently
Validate all user input before processing; use schema-based validation where available
Never trust external data (API responses, file content, query params); always validate
All user inputs must be validated and sanitized
Error messages must be scrubbed of sensitive internals
Use readable, well-named identifiers in all code
Keep functions under 50 lines
Keep files under 800 lines
Avoid nesting deeper than 4 levels
Implement comprehensive error handling in all code
Do not hardcode values; use constants or environment configuration instead
Do not use in-place mutation; always return new objects or state
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*.{js,ts,jsx,tsx,json,env*}
📄 CodeRabbit inference engine (.github/copilot-instructions.md)
Do not hardcode secrets, API keys, passwords, or tokens
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jshooks/hooks.jsonscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*.{js,ts}
📄 CodeRabbit inference engine (.github/copilot-instructions.md)
**/*.{js,ts}: Use parameterized queries for all database writes (no string interpolation)
Auth/authz must be checked server-side for every sensitive path
Rate limiting must be applied to all public endpoints
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*.{jsx,tsx,js,ts}
📄 CodeRabbit inference engine (.github/copilot-instructions.md)
HTML output must be sanitized where applicable
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*.{js,ts,env*}
📄 CodeRabbit inference engine (.github/copilot-instructions.md)
Required environment variables must be validated at startup
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*
📄 CodeRabbit inference engine (.cursor/rules/common-performance.md)
**/*: - Lightweight agents with frequent invocation
- Pair programming and code generation
- Worker agents in multi-agent systems
- Main development work
- Orchestrating multi-agent workflows
- Complex coding tasks
- Complex architectural decisions
- Maximum reasoning requirements
- Research and analysis tasks
Avoid last 20% of context window for:- Large-scale refactoring
- Feature implementation spanning multiple files
- Debugging complex interactions
- Single-file edits
- Independent utility creation
- Documentation updates
- Simple bug fixes
- Ensure extended thinking is enabled (on by default)
- Enable Plan Mode for structured approach
- Use multiple critique rounds for thorough analysis
- Use split role sub-agents for diverse perspectives
If build fails:- Use build-error-resolver agent
- Analyze error messages
- Fix incrementally
- Verify after each fix
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jshooks/hooks.jsonscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*.{js,jsx,ts,tsx,py,java,kt,go,rs,cpp,h,cs,rb,php}
📄 CodeRabbit inference engine (AGENTS.md)
**/*.{js,jsx,ts,tsx,py,java,kt,go,rs,cpp,h,cs,rb,php}: Immutability (CRITICAL): Always create new objects, never mutate. Return new copies with changes applied.
Input validation: Validate all user input at system boundaries. Use schema-based validation. Fail fast with clear messages. Never trust external data.
Error handling: Handle errors at every level. Provide user-friendly messages in UI code. Log detailed context server-side. Never silently swallow errors.
- Functions small (<50 lines), files focused (<800 lines)
- No deep nesting (>4 levels)
- Proper error handling, no hardcoded values
- Readable, well-named identifiers
- No hardcoded secrets (API keys, passwords, tokens)
- All user inputs validated
- SQL injection prevention (parameterized queries)
- XSS prevention (sanitized HTML)
- Error messages don't leak sensitive data
Secret management: NEVER hardcode secrets. Use environment variables or a secret manager. Validate required secrets at startup. Rotate any exposed secrets immediately.
Files:
tests/hooks/run-with-flags-truncation.test.jsscripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.jstests/hooks/stop-hooks-stdout.test.js
**/*.{test,spec}.{js,jsx,ts,tsx,py,java,kt,go,rs}
📄 CodeRabbit inference engine (AGENTS.md)
**/*.{test,spec}.{js,jsx,ts,tsx,py,java,kt,go,rs}: 1. Unit tests — Individual functions, utilities, components
2. Integration tests — API endpoints, database operations
3. E2E tests — Critical user flows
Files:
tests/hooks/run-with-flags-truncation.test.jstests/hooks/stop-hooks-stdout.test.js
{package.json,*.config.js,scripts/**/*.js}
📄 CodeRabbit inference engine (CLAUDE.md)
Package manager detection should support npm, pnpm, yarn, and bun, with configuration via CLAUDE_PACKAGE_MANAGER environment variable or project config.
Files:
scripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.js
scripts/**/*.js
📄 CodeRabbit inference engine (CLAUDE.md)
Ensure cross-platform support for Windows, macOS, and Linux via Node.js scripts in the scripts/ directory.
Files:
scripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.js
{scripts,bin}/**
⚙️ CodeRabbit configuration file
{scripts,bin}/**: Focus on command injection, unsafe subprocess usage, path traversal, SSRF, secret exposure, and missing tests for new CLI behavior.
Files:
scripts/hooks/run-with-flags.jsscripts/hooks/plugin-hook-bootstrap.js
hooks/**/*.json
📄 CodeRabbit inference engine (CLAUDE.md)
Hooks should be formatted as JSON with matcher conditions and hooks array.
Files:
hooks/hooks.json
🧠 Learnings (4)
📚 Learning: 2026-06-27T23:49:19.839Z
Learnt from: gaurav0107
Repo: affaan-m/ECC PR: 2373
File: tests/hooks/observe-signal-timeout.test.js:0-0
Timestamp: 2026-06-27T23:49:19.839Z
Learning: In tests under tests/hooks that require a Python runtime to run, the test should fail fast when Python isn’t available (or prerequisites aren’t met). Do not treat a missing Python runtime as test.skip, as an expected/allowed condition, or as a passing state; instead, explicitly fail (e.g., throw/return a rejected promise or use a test runner fail/expect that marks the test as failed) so reviewers can’t accidentally mask environment issues.
Applied to files:
tests/hooks/run-with-flags-truncation.test.jstests/hooks/stop-hooks-stdout.test.js
📚 Learning: 2026-07-14T03:26:12.530Z
Learnt from: thejesh23
Repo: affaan-m/ECC PR: 2517
File: tests/hooks/pre-bash-tmux-reminder.test.js:21-25
Timestamp: 2026-07-14T03:26:12.530Z
Learning: In this repository, do not flag `console.log` usage as a guideline violation in hook test files under `tests/hooks/*.test.js`. These tests intentionally use `console.log` for pass/fail output because the repo’s console-based runner (`tests/run-all.js`) is used and there is no Jest/Mocha dependency. Outside this specific hook-test path, follow the normal logging guidelines.
Applied to files:
tests/hooks/run-with-flags-truncation.test.jstests/hooks/stop-hooks-stdout.test.js
📚 Learning: 2026-08-13T13:06:11.222Z
Learnt from: dajiaohuang
Repo: affaan-m/ECC PR: 2780
File: tests/skills/repo-scan-install.test.js:57-58
Timestamp: 2026-08-13T13:06:11.222Z
Learning: JavaScript test files under tests/ must print summary lines in the exact format `Passed: N` and `Failed: N` to their combined stdout and stderr. The `tests/run-all.js` aggregator parses these lines to include each test file's results in the repository-wide totals.
Applied to files:
tests/hooks/run-with-flags-truncation.test.jstests/hooks/stop-hooks-stdout.test.js
📚 Learning: 2026-08-13T23:48:47.192Z
Learnt from: kritikagarg
Repo: affaan-m/ECC PR: 2785
File: tests/skills/story-lifecycle.test.js:36-36
Timestamp: 2026-08-13T23:48:47.192Z
Learning: JavaScript tests under tests/ should emit a summary containing parseable tokens in the form `Passed: N` and `Failed: N`. The `tests/run-all.js` aggregator parses these tokens from combined stdout and stderr, so a combined line such as `Results: Passed: N, Failed: N` is sufficient; do not require separate `Passed: N` and `Failed: N` lines.
Applied to files:
tests/hooks/run-with-flags-truncation.test.jstests/hooks/stop-hooks-stdout.test.js
🔇 Additional comments (5)
scripts/hooks/run-with-flags.js (1)
19-34: LGTM!Also applies to: 179-186
scripts/hooks/plugin-hook-bootstrap.js (1)
25-55: LGTM!Also applies to: 250-273
hooks/hooks.json (1)
193-193: LGTM!Also applies to: 204-204, 216-216, 227-227, 240-240, 253-253, 266-266, 281-281
tests/hooks/run-with-flags-truncation.test.js (1)
2-12: LGTM!Also applies to: 126-144
tests/hooks/stop-hooks-stdout.test.js (1)
11-17: LGTM!Also applies to: 30-30, 141-141, 226-226, 236-237
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Review on affaan-m#2796 found the plugin bootstrap truncating large non-strict passthrough output: a 262KB PreToolUse payload came back as 65,536 bytes (exactly one pipe buffer) with exit 0, handing downstream consumers a JSON document cut mid-stream. Cause is the same one affaan-m#2493 already solved in run-with-flags.js: process.exit() immediately after a stdout write discards whatever is still queued past the pipe buffer. The bootstrap never received that fix. Five exit sites shared the pattern — the three fallbacks the review named (missing target, unknown mode, resolution error) plus the two after passthrough (normal completion, execution failure), where the write and the exit sat in different functions. - mirror run-with-flags.js's drain-aware exitWithStdout() (it exports nothing and calls main() at module scope, so it cannot be imported; the contract is duplicated with a comment naming the source) - passthrough() -> passthroughText(): return the text instead of writing it, so every exit routes through one helper - strict-event suppression is untouched: the isStrictOutputEvent() checks and the byte-identity comparison keep their exact semantics Measured: 262,105B in -> 262,105B out (was 65,536B). Stop/SubagentStop still emit 0B for a 262KB payload. Exit codes preserved. Tests +14 (bootstrap large-payload and Stop/SubagentStop coverage, plus the parameterized opinionated-output cases review asked for); reverting the fix fails 4 of them. tests/hooks: 1165 passed. Co-Authored-By: Claude Fable 5 <[email protected]> Co-authored-by: Orca <[email protected]>
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ECC bundle files are already tracked in this repository. Skipping generation of another bundle PR. |
1 participant
Summary
On current Claude Code (observed on 2.1.231–2.1.233), every turn stop with a disabled or no-opinion Stop hook surfaces
invalid stop hook JSON output. The root cause is ECC's passthrough convention (echo stdin on stdout when a hook has no opinion) colliding with the harness's per-event stdout contract: Stop stdout is parsed strictly as hook-output JSON, so an echoed Stop input payload is invalid output at any size. #2222/#2227 suppressed only the truncated-echo case (>1MB); sub-cap payloads still echoed on every turn stop.This PR makes the harness-facing boundary event-aware: for strict-output events (
Stop,SubagentStop) "no opinion" is empty stdout, never an echo. All other events keep the existing passthrough design untouched.Symptom
With
ECC_DISABLED_HOOKS=stop:desktop-notify(or any Stop hook returning no opinion), Claude Code shows on every response:Reproduction (before this PR):
Root cause (three layers, all at the harness boundary)
scripts/hooks/run-with-flags.js— every no-opinion fallthrough (disabled hook, dry-run, missing args, missing script,run()error) andresolveHookResult's no-opinion branch echoraw.scripts/hooks/plugin-hook-bootstrap.js—passthrough()echoesrawwhen the child produced no stdout, and the missing-args / unknown-mode / spawn-error fallbacks echoraw.hooks/hooks.json— the Stop lifecycle wrappers' unresolvable-root fallback callsfinish(raw, …); the SessionEnd fallback doesprocess.stdout.write(raw).Additionally, several Stop hook scripts follow the legacy echo-stdin convention when invoked directly; the runner previously forwarded that echo to the harness.
What changed
run-with-flags.js: introducesSTRICT_OUTPUT_EVENTS = {Stop, SubagentStop}(detected fromhook_event_namein the stdin payload). For those events,sanitizeEchosuppresses any stdout that is byte-identical to the stdin payload — covering both the runner's own fallthroughs and hook scripts that echo by convention. Real hook output (which always differs from the input payload) is forwarded untouched. The oversized-payload (run-with-flags.js echoes truncated stdin on >1MB payloads, blocking all large-file edits #2222) behavior is preserved verbatim.plugin-hook-bootstrap.js: same contract for the bootstrap's child-stdout forwarding and its three fallback paths.hooks/hooks.json: Stop wrapper fallbacksfinish('')instead offinish(raw, …)(stderr warnings kept); the SessionEnd fallback no longer echoes stdin (harness ignores SessionEnd stdout).tests/hooks/stop-hooks-stdout.test.js(Ran 7 stop hooks (ctrl+o to expand) ⎿ Stop hook error: JSON validation failed #2090): the "registered wrapper" and dry-run expectations now assert empty stdout at the boundary. The previous expectation (echo the payload uncut) is precisely the output current Claude Code rejects. Direct-invocation expectations (script-level echo conventions) are unchanged.tests/hooks/run-with-flags-truncation.test.js: adds a disabled-Stop regression test (the exact live failure) and an opinionated-output preservation test (additionalContextsurvives); all pre-existing passthrough expectations for non-strict events are untouched.What deliberately did NOT change
Verification
tests/hooks/run-with-flags-truncation.test.js: 9/9tests/hooks/stop-hooks-stdout.test.js: 40/40tests/hooks/plugin-hook-bootstrap.test.js: 14/14,hook-flags: 63/63,gateguard-fact-force: 144/144,config-protection: 9/9,lib/dry-run: 12/12node tests/run-all.js: 3914/3918 (the 4 failures are pre-existinglib/state-storeenvironment failures on my machine, identical before this change)Related
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