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[Manual Only] Record project learnings in FORyusuke.md. Structurally append lessons learned, pitfalls, debugging stories, and improvement points obtained during the session. It only works when explicitly called via /teach (it will not be triggered automatically in normal work).
npx skill4agent add yusuketsunoda/ppt-trans teach/teach [topic]/teach Claude Code configuration audit/teach E2E test flakiness countermeasures/teach Stripe Webhook implementation## [Date] [topic]
### What I learned
- Technical learnings
- Design decisions and their rationales
- Tools and technologies used
### Pitfalls
- Encountered problems and their causes
- Misunderstandings I had
- Points that wasted time
### If I do it again
- Better approaches
- Things I wish I knew from the beginning
- Lessons for the next time$ARGUMENTS## 2026-01-26 Claude Code Configuration Audit
### What I learned
- The unit of hooks timeout is seconds (not milliseconds)
- permissions.deny uses `./` prefix for repository relative paths
- Path validation is required after resolving symlinks with realpath
### Pitfalls
- timeout: 5000 was set to 5000 seconds (about 83 minutes)
- Wildcards like `*.env*` are too broad and cause false positives
- Detecting the string `..` cannot prevent bypass via symlinks
### If I do it again
- Check the unit in official documentation first
- Verify with tests immediately after configuration changes
- Design security settings with defense in depth