Update Design Document

Record/update project design and implementation decisions in .claude/docs/DESIGN.md based on conversation content.

Note: This skill explicitly invokes the same workflow as the design-tracker skill. Use this when you want to force a design document update.

Workflow

• Read existing .claude/docs/DESIGN.md

• Extract decisions/information from the conversation

• Update the appropriate section

• Add entry to Changelog with today's date

Section Mapping

Topic Section

Goals, purpose Overview

Structure, components Architecture

Design patterns Implementation Plan > Patterns

Library choices Implementation Plan > Libraries

Decision rationale Implementation Plan > Key Decisions

Future work TODO

Unresolved issues Open Questions

Update Format

When updating, add to the appropriate section:

Key Decisions

{Decision Title} ({Date})

Context: {Why this decision was needed} Decision: {What was decided} Rationale: {Why this option was chosen}

Changelog Entry

Always add to Changelog:

Changelog

{Date}

• {Brief description of what was recorded}

Language

• Document content: English (technical), Japanese OK for descriptions

• User communication: Japanese

If $ARGUMENTS provided, focus on recording that content.