# CLAUDE.md

Rules for `litellm-rust/crates/python-bridge`.

## Responsibility

`python-bridge` is the PyO3 boundary between Python LiteLLM and Rust transforms.
Keep this crate thin. It adapts Python objects to Rust payloads and returns
Python-compatible dictionaries.

## Bridge Shape

- Prefer one stable method per top-level LiteLLM route, for example
  `messages(...)`, calling the matching `litellm-core` entrypoint.
- Do not add one exported PyO3 function per provider helper unless there is a
  measured reason.
- Provider dispatch belongs in the `litellm-core` route module (e.g.
  `litellm_core::messages`), not in this PyO3 crate.
- Python owns rollout state and fallback. Rust should return errors; Python
  decides whether to raise or fall back. For a rust-only provider/route (no
  Python reference), the Python side is a thin dispatch that calls Rust and
  raises when the bridge is unavailable, with no fallback.
- Keep the Python interface minimal (well under 100 lines per route): it only
  marshals inputs and calls Rust. Do not add per-route feature flags, and do
  not put provider dispatch in `litellm/main.py`; it lives in a thin dispatch
  class under `litellm/llms/<provider>/<route>/`.

## Data Handling

- OCR payloads can contain personal data and large base64 images. Do not log
  payloads or provider responses.
- Avoid copying large payloads more than needed. The current JSON round-trip is
  acceptable for the first scaffold, but future performance work should evaluate
  direct PyO3 conversion before expanding Rust coverage to image-heavy paths.
- Do not expose raw Rust errors that include document contents or upstream
  bodies.

## Tests

- `cargo test --workspace` must compile this crate.
- Python tests must cover bridge disabled, bridge enabled, and module-missing
  fallback behavior for every exposed route.
