Generate production-ready FastAPI Cursor rules for Project Rules (.mdc), AGENTS.md, or legacy .cursorrules. This template encodes stack-specific conventions for projects using FastAPI. Modern Python async web framework with OpenAPI docs and Pydantic validation.
The template focuses Cursor AI on concrete FastAPI practices instead of generic coding advice. Required sections are always included; optional sections can be enabled when they match your project.
The generator turns these sections into Project Rules with frontmatter, AGENTS.md, or a single .cursorrules file depending on the output format you choose.
- Use path operation decorators (@app.get, @app.post, etc.).
- Use 4 spaces for indentation.
- Use snake_case for route handler functions.
- Use Pydantic models for request bodies and query parameters.
- Use path parameters with type hints for automatic validation.
- Use APIRouter for modular route organization with prefix and tags.- Use Pydantic v2 models for all request/response schemas.
- Use Field() with validation constraints (min_length, gt, pattern, etc.).
- Define separate schemas for input (BaseModel) and output (Response model).
- Use response_model parameter for automatic response serialization.
- Use Annotated types with Query(), Path(), Body(), Header().
- Use model_validator for cross-field validation logic.- Use Depends() for reusable dependencies (DB sessions, auth, config).
- Use generator-based dependencies with yield for resource cleanup.
- Use dependency overrides for testing.
- Use sub-dependencies — dependencies that depend on other dependencies.
- Keep dependencies focused on a single concern.
- Use class-based dependencies via __call__ for stateful dependencies.