Oxbrook

A fast Python REST framework with a Rust core, built-in reactive streams, and agent-native interfaces.

pip install oxbrook

# main.py
from oxbrook import App, Request

app = App()

@app.get("/")
async def hello(_: Request):
    return {"hello": "world"}

oxbrook run main:app --reload

Documentation: ishangavidusha.github.io/oxbrook

Status

Alpha. Every feature below is covered by the test suites on both CPython 3.14 builds, but the API is not settled. While the version is 0.x, a minor release (0.2.0) may change the API and a patch release (0.1.1) does not; every change that breaks code is listed in the changelog. This is a personal project, not a supported product.

Requires CPython 3.14, free-threaded (python3.14t) or standard, on Linux or macOS. Wheels are published for both builds on x86-64 and ARM; anywhere else pip builds from source, which needs a Rust toolchain. Windows is not supported yet; WSL2 works in the meantime.

What it does

REST. A radix-tree router per HTTP method, with path and query parameters typed by the handler's annotations and coerced in Rust. A request that cannot succeed is answered before a Python worker is woken. Pydantic request and response bodies, forms and multipart uploads parsed in Rust, request bodies larger than memory with backpressure, static files, routers, middleware, exception handlers, dependency injection with teardown, lifespans, signed cookie sessions, CORS, and OpenAPI 3.1 from the same route metadata the router uses.

Serving. HTTP/1.1 and HTTP/2, HTTPS, bounded concurrency with 503 rather than an unbounded backlog, request timeouts, handlers cancelled when their client leaves, graceful shutdown on SIGTERM, and an oxbrook command with reload for development.

Streams. Named topics with fan-out and four backpressure policies. Subscribers on every worker loop in the process receive every message, which free-threaded CPython makes possible. SSE(...) and @app.websocket(...) hand a topic to a client. App(redis_url=...) makes a topic durable: persisted, replayable, shared across processes, with consumer groups for work that must not be lost.

Agents. tool=True on a route also exposes it over the Model Context Protocol at /mcp, with its name, description and schemas taken from the handler that already exists. Opt-in, so a route is not agent-callable until someone decides it should be.

Performance

Apple Silicon, 10 cores, 64 connections. A CPU-bound handler gains 3.15x on four worker loops on the free-threaded build, against 1.03x on the GIL build.

Hello world measures dispatch, not a framework. The performance page has the method, the machine, what each feature costs, and what has not been measured.

How it works

A tokio thread parses a request, matches it against a radix tree, coerces its parameters, and pushes a plain Rust struct onto a worker's bounded queue without touching the interpreter. It writes one byte to a socketpair only if no wakeup is already in flight, so a burst of requests collapses into a single wakeup, and each worker's asyncio loop schedules every queued handler in one callback. See internals.

Contributing

Building from source, running the suites and the project's conventions are in CONTRIBUTING.md.

License

MIT.