FastAPI

What this skill does

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`.

FastAPI is part of the Developer Tools category — developer tools that help your agent write, review, debug, and ship code. You can install it on its own or alongside other developer tools skills from the OpenClaw catalog.

How to install FastAPI

The easiest path is via the OpenClaw Easy desktop app — one click, no terminal required:

1. Download OpenClaw Easy for macOS or Windows (free, one-click installer, ~30 seconds).
2. Open the in-app Skills panel.
3. Search for fastapi and click Install.
4. The skill activates automatically when an incoming message matches its description.

Install from the command line

If you already run the OpenClaw CLI, add FastAPI with a single command:

openclaw skills add fastapi

This pulls fastapi from ClawHub and installs it into ~/.openclaw/skills/fastapi/. Restart the OpenClaw gateway afterwards so the new skill is discovered.

How to use FastAPI

Once installed, FastAPI activates on its own: when an incoming message on WhatsApp, Telegram, Slack, Discord, Feishu or Line matches the skill's description, your OpenClaw agent loads it and runs the workflow. You can also trigger it explicitly by describing the task in chat. No extra configuration is required after install.

Manual install (advanced)

If you prefer manual installation:

1. Click the Download .zip button above to grab fastapi-1.0.1.zip directly from our S3 mirror.
2. Unzip into ~/.openclaw/skills/fastapi/ (create the directory if it does not exist).
3. Restart OpenClaw Easy (or the OpenClaw CLI gateway) so the new skill is discovered.

Frequently asked questions

How do I install FastAPI?

Install FastAPI in the OpenClaw Easy desktop app by opening the Skills panel, searching for fastapi, and clicking Install. From a terminal you can run: openclaw skills add fastapi. Either way the skill is placed in ~/.openclaw/skills/fastapi/.

Is FastAPI free?

Yes. FastAPI is free and open-source, distributed under the Apache-2.0 license through ClawHub. No account or payment is required to download or run it.

What does FastAPI do?

Builds, debugs, and hardens FastAPI services: async endpoints, Pydantic models, dependency injection, auth, and deployment.

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