---
description: Documentation Language Rules
globs: 
  - "**/*.md"
  - "**/*.mdc"
alwaysApply: false
---


# Documentation Language Rules

## Overview

All documentation files (`.md`, `.mdc`) in this project must be written in **English**.

## Rules

1. **Write all documentation in English**
   - README files
   - Technical documentation
   - Code comments in markdown
   - Rule files (`.claude/rules/`, `.cursor/rules/`)
   - Skill files (`.claude/skills/`, `.cursor/skills/`)

2. **Exceptions**
   - Inline code comments in source files may use Japanese if necessary for clarity
   - User-facing messages that require localization

3. **Consistency**
   - Use American English spelling (e.g., "color" not "colour")
   - Use consistent terminology throughout the project

## Rationale

- English documentation ensures accessibility for international contributors
- Maintains consistency across the codebase
- Facilitates collaboration with global developer community