FastAPI

Description

Builds, debugs, and hardens FastAPI services: async endpoints, Pydantic models, dependency injection, auth, and deployment. Use when writing or reviewing a FastAPI app, router, or schema; when the API hangs or every route slows because a sync driver or CPU work blocks the event loop; when a request returns an unexpected 422, a POST becomes a 307, or a 500 arrives with no CORS headers; when migrating pydantic v1 to v2 (`model_dump`, `from_attributes`, `field_validator`); when `Depends` runs too often, `yield` cleanup misfires, or dependency overrides do not take; when SQLAlchemy raises `QueuePool limit` or `MissingGreenlet`, or connections leak across workers; when TestClient, httpx `AsyncClient`, or pytest-asyncio fail with a closed event loop; when uvicorn or gunicorn workers, graceful shutdown, `root_path`, or proxy headers need deciding; or when background tasks, WebSockets, SSE, uploads, or the OpenAPI docs misbehave. Not for Django, Flask, or general Python — `django`, `flask`, `py`.

Install FastAPI

Run this in your OpenClaw agent to add FastAPI from the ClawHub registry.

Requires ClawHub registry access. Review the security analysis below before installing.

Related skills

Frequently asked questions