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fastapi

Use when building, reviewing, testing, securing or shipping a FastAPI / async Python service — routers, Pydantic v2 schemas, dependency injection, async SQLAlchemy 2.0, OAuth2/JWT, ASGITransport tests, production wiring. NOT language-level Python or packaging (that is `python`), NOT engine-level SQL (that is `postgresdb`), NOT framework-agnostic REST contracts (that is `api-design`).

skills/fastapi/SKILL.md

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# FastAPI & modern Python services

The single authoritative skill for building, reviewing, testing, securing and shipping an
async FastAPI service on Python 3.12+. The mental model: **the app is a thin async HTTP
layer over typed dependencies, a service/repository core, and explicit DB sessions. Routes
validate and delegate; they never own business logic, raw SQL, or secrets.**

Pinned stack: Python 3.12+, FastAPI 0.136+, Starlette 1.0+ (FastAPI 0.136 requires it;
avoid <1.0.1, GHSA-86qp-5c8j-p5mr), Pydantic v2 (2.7+) + pydantic-settings 2.x,
SQLAlchemy 2.0 async, Alembic 1.13+, asyncpg 0.30 / psycopg 3, httpx 0.28+,
pytest 8 + pytest-asyncio 1.0+ (`asyncio_mode=auto`), ruff 0.7+, mypy 1.13+ strict,
uv 0.5+, uvicorn 0.32+ / gunicorn 23+ + uvicorn-worker 0.3+, PyJWT 2.10+, argon2-cffi 23+,
pip-audit 2.7+, PostgreSQL 16. (All lower bounds; install the latest in each line.)