Push Bedrock Anthropic payload mutations into lingua #82
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knjiang
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Feb 9, 2026
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Add support for routing Bedrock Anthropic models (e.g. us.anthropic.claude-3-5-sonnet-20241022-v2:0) through the native Anthropic Messages API instead of the Converse API. Key changes: - Catalog: Bedrock Anthropic models now use format "anthropic" - Lingua: transform_request applies Bedrock mutations (strip model/stream, inject anthropic_version) when target is Anthropic and model name matches the Bedrock pattern - Router: use spec.format instead of provider.format() so Bedrock Anthropic models get Anthropic-format payloads; add model_overrides and add_provider_for_format for multi-format provider routing - Streaming: add bedrock_messages_event_stream for decoding Bedrock's base64-encoded invoke-with-response-stream events - Bedrock provider: format-aware invoke_url routing (/invoke for Anthropic, /converse for Converse) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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…ences - Make is_bedrock_anthropic_model public so the gateway can reuse it for Bedrock Anthropic model routing overrides (single shared function). - Strip whitespace-only stop sequences in apply_bedrock_anthropic_mutations. Bedrock's Anthropic Messages API rejects stop sequences like "\n" that contain only whitespace. The direct Anthropic API has the same restriction. OpenAI accepts them. This is a lossy transformation documented in comments. - Add tests for whitespace stop sequence filtering. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
model/stream, injectanthropic_version) into lingua'stransform_request-- the router just callstransform_request, getsBytesback, done"format": "converse"to"format": "anthropic"in catalogspec.formatinstead ofprovider.format()in the router so Bedrock Anthropic models get transformed to Anthropic formatadd_provider_for_format()andadd_model_override()onRouterBuilderso Bedrock can serve both Converse and Anthropic format modelsbedrock_messages_event_streamfor Bedrock Anthropic streaming (base64-encoded AWS binary event stream)invoke_urlformat-aware routing (/invokefor Anthropic,/conversefor Converse)mutate_payload, notransform_request_to_value, noTransformResultValueTest plan
is_bedrock_anthropic_modeldetectioncargo testpasses across full workspacecargo checkpasses for gateway🤖 Generated with Claude Code