Release v1.6.7

🎯 Highlights

This release significantly improves AI execution accuracy by clarifying the existing code investigation process and preventing duplicate implementations.

✨ What's New

Enhanced Code Investigation Process

• Pattern 5 Added: New anti-pattern "Insufficient Existing Code Investigation" to prevent duplicate implementations
• Pre-implementation Checks: All AI agents now enforce thorough existing code investigation before implementation
• Better Decision Recording: Design Docs now require explicit documentation of similar functionality searches and decisions

📝 Changes

Documentation Improvements

• Added Pattern 5 to AI Development Guide for preventing architectural inconsistencies
• Enhanced technical-designer agent with similar functionality search workflow
• Updated task-executor with pre-implementation verification steps
• Strengthened code-reviewer validation checklist
• Improved work-planner with code investigation references

Technical Enhancements

• Added code-reading and best-practices tags to rules index
• Synchronized all improvements between Japanese and English documentation
• Clarified "Existing Codebase Analysis" section requirements in Design Docs

🔧 Developer Impact

This update ensures:

• Reduced Duplicate Code: AI agents will detect and reuse existing implementations
• Better Architecture Consistency: Similar functionality is handled uniformly across the codebase
• Clearer Decision Trail: All implementation decisions are documented with rationale
• Improved Code Quality: Pre-implementation checks prevent architectural drift

📚 Documentation

The following key processes have been clarified:

1. Search for similar functionality before implementation
2. Decision workflow: Use existing / Improve with ADR / Create new
3. Record all decisions in Design Doc's "Existing Codebase Analysis" section

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Full Changelog: v1.6.6...v1.6.7