8fed5bc6ef
6 new issues for Claude Code hook improvements: - 012: Test output filtering (reduce noise, show failures only) - 013: Stop verification (verify work complete before stopping) - 014: Auto-test on edit (async tests after code changes) - 015: Session context injection (git/issues/CI on startup) - 016: Silent auto-formatting (suppress formatter output) - 017: Expose/hide policy (define what to show vs suppress) Based on Claude Code hooks documentation: - PostToolUse with suppressOutput for noise reduction - Stop hooks with agent verification - Async hooks for background testing - SessionStart for context injection - additionalContext for exposing important info Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
124 lines
2.8 KiB
Markdown
124 lines
2.8 KiB
Markdown
# feat(hooks): Define what to expose vs hide in output
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## Summary
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Document and implement a consistent policy for what hook output should be exposed to Claude vs hidden.
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## Principles
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**Expose (additionalContext):**
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- Errors that need fixing
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- Failures that block progress
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- Decisions that need to be made
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- Security warnings
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- Breaking changes
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**Hide (suppressOutput):**
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- Success confirmations ("formatted", "passed")
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- Verbose progress output
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- Repetitive status messages
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- Debug information
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- Intermediate results
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## Output Categories
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### Always Expose
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| Category | Example | Reason |
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|----------|---------|--------|
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| Test failures | `FAIL: TestFoo` | Must be fixed |
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| Build errors | `cannot find package` | Blocks progress |
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| Lint errors | `undefined: foo` | Code quality |
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| Security alerts | `HIGH vulnerability` | Critical |
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| Type errors | `type mismatch` | Must be fixed |
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### Always Hide
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| Category | Example | Reason |
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|----------|---------|--------|
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| Pass confirmations | `PASS: TestFoo` | No action needed |
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| Format success | `Formatted 3 files` | No action needed |
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| Coverage numbers | `coverage: 84.2%` | Unless requested |
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| Timing info | `(12.3s)` | Noise |
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| Progress bars | `[=====> ]` | Noise |
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### Conditional
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| Category | Show When | Hide When |
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|----------|-----------|-----------|
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| Warnings | First occurrence | Repeated |
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| Suggestions | Actionable | Informational |
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| Diffs | Small (<10 lines) | Large |
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| Stack traces | Unique error | Repeated |
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## Implementation Pattern
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```bash
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#!/bin/bash
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INPUT=$(cat)
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OUTPUT=$(echo "$INPUT" | jq -r '.tool_response.output // empty')
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# Extract what matters
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ERRORS=$(echo "$OUTPUT" | grep -E "FAIL|ERROR|panic" | head -10)
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SUMMARY=$(echo "$OUTPUT" | tail -1)
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if [ -n "$ERRORS" ]; then
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# Expose failures
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cat << EOF
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{
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"hookSpecificOutput": {
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"hookEventName": "PostToolUse",
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"additionalContext": "## Issues Found\n\n$ERRORS\n\n**Summary:** $SUMMARY"
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}
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}
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EOF
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else
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# Hide success
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echo '{"suppressOutput": true}'
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fi
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```
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## Hook-Specific Policies
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### PostToolUse (Bash)
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```
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core go test → Expose failures, hide passes
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core go lint → Expose errors, hide "no issues"
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core build → Expose errors, hide success
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git status → Always expose (informational)
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git commit → Expose result, hide diff
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```
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### PostToolUse (Write/Edit)
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```
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Format result → Always hide
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Debug check → Expose if found, hide if clean
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```
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### PostToolUseFailure
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```
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All errors → Always expose with context
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Interrupts → Hide (user initiated)
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```
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## Aggregation
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When multiple issues, aggregate intelligently:
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```
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Instead of:
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- FAIL: TestA
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- FAIL: TestB
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- FAIL: TestC
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- (47 more)
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Show:
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"50 tests failed. Top failures:
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- TestA: nil pointer
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- TestB: timeout
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- TestC: assertion failed
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Run `core go test -v` for full output"
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```
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