feat: support AnthropicMessages API flavor for Bedrock-hosted Claude#93
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Add ApiFlavor.ANTHROPIC_MESSAGES and route discovery's apiFlavor=AnthropicMessages (vendor AwsBedrock) to UiPathChatAnthropic using the native Anthropic SDK (model-in-body wire format) over the Bedrock passthrough URL. The gateway rejects the AnthropicBedrock (Bedrock-invoke) body for this flavor with HTTP 400; the native body is required. - constants: new ApiFlavor.ANTHROPIC_MESSAGES + API_FLAVOR_TO_VENDOR_TYPE mapping - UiPathChatAnthropic: explicit api_flavor input selects native Anthropic SDK for AnthropicMessages; vendor-derived defaults (awsbedrock -> invoke) unchanged - factory: route AnthropicMessages within the AWSBEDROCK branch - tests: constants, factory routing, client flavor/SDK selection + regression guard - bump core + langchain to 1.14.0 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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cosminacho
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What & why
Adds support for the
AnthropicMessagesAPI flavor that the discovery endpoint now exposes (e.g.anthropic.claude-sonnet-4-6, returned asvendor=AwsBedrock,apiFlavor=AnthropicMessages). Previously such a model fell through the factory'sAWSBEDROCKbranch toUiPathChatBedrockConverse, and the gateway rejects the Bedrock-invoke body for this flavor with HTTP 400.The gateway contract (verified live against alpha) for this flavor is:
awsbedrockpassthrough route (.../vendor/awsbedrock/model/{model}/completions) — driven by discovery's hostingvendorX-UiPath-LlmGateway-ApiFlavor: AnthropicMessagesmodelin body, noanthropic_version) — i.e. the nativeAnthropicSDK, notAnthropicBedrockChanges (affects both packages → versioned together)
core (
uipath-llm-client)ApiFlavor.ANTHROPIC_MESSAGES = "AnthropicMessages"(value is the discovery string verbatim — it's forwarded as the flavor header)API_FLAVOR_TO_VENDOR_TYPE[ANTHROPIC_MESSAGES] = AWSBEDROCK(resolves the vendor when discovery omits it)langchain (
uipath-langchain-client)UiPathChatAnthropicgains an explicitapi_flavorinput. WhenANTHROPIC_MESSAGES, it uses the nativeAnthropic/AsyncAnthropicSDK while keepingvendor_type=awsbedrockfor URL routing. Vendor-derived defaults are unchanged (awsbedrock→invoke+AnthropicBedrock).get_chat_modelroutesAnthropicMessageswithin theAWSBEDROCKbranch to that client.versioning — bumped core + langchain to 1.14.0, updated both CHANGELOGs and the
uipath-llm-client>=1.14.0floor (per CONTRIBUTING/CLAUDE.md rules for a core+langchain change).Tests
test_api_config.py: enum value + vendor mappingtest_factory_function.py::TestFactoryAnthropicMessagesRouting: routing with and without a discovered vendortest_unit.py::TestAnthropicMessagesFlavor: flavor/api_config + native-SDK selectiontest_unit.py::TestVendorDerivedDefaultsUnchanged: regression guard for the existing Bedrock-invoke path18 new/affected unit tests pass;
ruff checkandpyrightclean on changed files. Validated end-to-end by running a low-code agent onanthropic.claude-sonnet-4-6(completes successfully).Notes for reviewers
EnabledNewLlmClientspath (the legacy factory raisesUnknown apiFlavor).TestFactoryFunctionparametrized cases forclaude-haiku-4-5@20251001/gemini-embedding-001may fail locally if the tenant catalog lacks those names — unrelated to this change.🤖 Generated with Claude Code