2026年版：FastAPIエージェントに渡すルールファイル(CLAUDE.md/AGENTS.md)の実例と書き方

This article delves into the practical use of rule files for AI agents like Claude Code or Cursor in FastAPI projects, emphasizing their role in standardizing code generation and enforcing coding styles across repositories. It highlights common issues in FastAPI projects, such as inconsistent endpoint structures and dependency injection methods, which rule files can help mitigate. The example provided details a typical FastAPI-specific rule file, outlining stack specifications and router design principles, to ensure uniformity in code generation and maintainability of the project.