Design Tracker Skill

Purpose

This skill manages the project's design documentation (.claude/docs/DESIGN.md). It automatically tracks:

• Architecture decisions
• Implementation plans
• Library choices and their rationale
• TODO items and open questions

When to Activate

• User discusses architecture or design patterns
• User makes implementation decisions (e.g., "let's use ReAct pattern")
• User says "record this", "add to design", "document this"
• User asks "what's our current design?" or "what have we decided?"
• Important technical decisions are made during conversation

Workflow

Recording Decisions

1. Read existing .claude/docs/DESIGN.md
2. Extract the decision/information from conversation
3. Update the appropriate section
4. Add entry to Changelog with today's date

Sections to Update

Conversation Topic	Target Section
Overall goals, purpose	Overview
System structure, components	Architecture
Patterns (ReAct, etc.)	Implementation Plan > Patterns
Library choices	Implementation Plan > Libraries
Why we chose X over Y	Implementation Plan > Key Decisions
Things to implement later	TODO
Unresolved questions	Open Questions

Output Format

When recording, confirm in Japanese:

• What was recorded
• Which section was updated
• Brief summary of the change

Language Rules

• Thinking/Reasoning: English
• Code examples: English
• Document content: English (technical terms) + Japanese (descriptions OK)
• User communication: Japanese