Fix Claude provider model discovery proxy - #439
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Summary
Scope Claude's native gateway model discovery to the selected Model Provider Service.
Claude Code applies
ANTHROPIC_CUSTOM_HEADERSto inference requests but omits them fromGET /v1/models. Thread the selected provider into ucode's loopback proxy and injectDatabricks-Model-Provider-Serviceonly for model-discovery requests, including retries.This is stacked on #423. Server counterpart: https://github.com/databricks-eng/universe/pull/2523045
Testing
uv run pytest(2,133 passed, 37 skipped)uv run ruff check .uv run ruff format --check src teststestenv://liteswap/andy-aigtwy4355:/modelloaded the MPS-scoped catalog instead of the 50-model workspace catalogus.anthropic.claude-sonnet-4-6OKroute=main.aarushi.aarushi-bedrock🥞 Stacked PR (generated by Stack)
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