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litellm/litellm-rust/README.md
mateo-berri f986fc52f0 ci(rust): lint every gateway feature and keep one checks runbook 
Clippy never links, so python-config's pyo3/auto-initialize needs no
libpython and the gateway clippy step can cover every feature at once.
The test step stays on --features server because cargo test does link
and this job installs no Python.

The check list existed in three places that had already drifted apart;
CLAUDE.md is now the only copy and the other two point at it.
2026-09-02 22:16:40 -07:00

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LiteLLM Rust

This workspace contains the staged Rust implementation for LiteLLM.

litellm-core is the LiteLLM SDK in Rust: one entrypoint per top-level call that makes the LLM call and hands back a typed response, the same shape as litellm.messages() in Python.

let response = litellm_core::messages::messages(MessagesRequest {
    model: "claude-sonnet-4-5",
    body,
    api_key: Some(key),
    ..
})
.await?;

Python continues to own configuration, retries, routing policy, logging, callbacks, spend tracking, and customer plugins until each Rust path has parity coverage and production evidence.

Crates

Crate Role
litellm-core The SDK. Per-route entrypoints (messages::messages()), types, provider transforms (modules under providers/), provider resolution, auth, the provider HTTP call, and the router.
litellm-ai-gateway The axum server (behind the server feature) and WebSocket hosts. Translates HTTP/WS to core entrypoints; no provider handlers.
litellm-python-interop Domain-neutral PyO3 foundation for GIL handling and typed Python/Serde conversion.
litellm-python-bridge PyO3 cdylib exposing LiteLLM Rust APIs to the Python SDK. Owns API registration, domain wiring, and Python exception mapping.

Dependency direction is acyclic: litellm-python-bridge depends on the domain layers and litellm-python-interop; the interop foundation depends on no LiteLLM domain crate.

Layout

crates/
  core/           The SDK: route modules + provider transforms.
    src/messages/   mod.rs (entrypoint), types, transformation, prepare, handler, client
    src/providers/anthropic/messages/transformation.rs
  ai-gateway/     Axum server + WebSocket hosts; calls core entrypoints.
  python-interop/ Domain-neutral PyO3 conversion and GIL primitives.
  python-bridge/  PyO3 API adapter for Python LiteLLM.

The folder shape follows the Python provider tree: core/src/providers/<provider>/<route>/transformation.rs. The bridge exposes one function per top-level route, mirroring the core entrypoints.

Checks

Run the commands under "Checks" in CLAUDE.md before pushing Rust changes. That list is the single source of truth and matches what GitHub Actions runs for changes under litellm-rust/.