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airflow-plugins

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Builds Airflow 3.1+ plugins that embed FastAPI apps, custom UI pages, React components, middleware, macros, and operator links directly into the Airflow UI. Use when building anything custom inside Airflow 3.1+ that involves Python and a browser-facing interface - creating an Airflow plugin, adding a custom UI page or nav entry, building FastAPI-backed endpoints inside Airflow, serving static assets from a plugin, embedding a React app, adding middleware to the API server, creating custom operator extra links, or calling the Airflow REST API from inside a plugin; also when AirflowPlugin, fastapi_apps, external_views, react_apps, or plugin registration come up.

skills/airflow-plugins/SKILL.md

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# Airflow 3 Plugins

Airflow 3 plugins let you embed FastAPI apps, React UIs, middleware, macros, operator buttons, and custom timetables directly into the Airflow process. No sidecar, no extra server.

> **CRITICAL**: Plugin components (fastapi_apps, react_apps, external_views) require **Airflow 3.1+**. **NEVER import `flask`, `flask_appbuilder`, or use `appbuilder_views` / `flask_blueprints`** — these are Airflow 2 patterns and will not work in Airflow 3. If existing code uses them, rewrite the entire registration block using FastAPI.
>
> **Security**: FastAPI plugin endpoints are **not automatically protected** by Airflow auth. If your endpoints need to be private, implement authentication explicitly using FastAPI's security utilities.
>
> **Restart required**: Changes to Python plugin files require restarting the API server. Static file changes (HTML, JS, CSS) are picked up immediately. Set `AIRFLOW__CORE__LAZY_LOAD_PLUGINS=False` during development to load plugins at startup rather than lazily.
>
> **Relative paths always**: In `external_views`, `href` must have no leading slash. In HTML and JavaScript, use relative paths for all assets and `fetch()` calls. Absolute paths break behind reverse proxies.

### Before writing any code, verify