Python: [BREAKING] Types API Review improvements#3647

Merged

eavanvalkenburg merged 16 commits intomicrosoft:mainfrom

eavanvalkenburg:types-api-review-3575

Feb 4, 2026

Commits on Feb 4, 2026

Replace Role and FinishReason classes with NewType + Literal
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Simplify ChatResponse and AgentResponse type hints (#3592)
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Remove text parameter from ChatResponseUpdate and AgentResponseUpdate (#3597)
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Rename from_chat_response_updates to from_updates (#3593)
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Remove try_parse_value method from ChatResponse and AgentResponse (#3595)
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Add agent_id to AgentResponse and clarify author_name documentation (#3596)
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Simplify ChatMessage.__init__ signature (#3618)
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Allow Content as input on run and get_response
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Fix ChatMessage usage across packages and samples
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Fix Role string usage and response format parsing
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Fix ollama .value and ai_model_id issues, handle None in content list
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Fix A2AAgent type signature to include Content
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Fix Role/FinishReason NewType dict annotations and improve test coverage to 95%
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Fix mypy errors for Role/FinishReason NewType usage
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Fix Role.TOOL and Role.ASSISTANT usage in _orchestrator_helpers.py
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Fix Role NewType usage in durabletask _models.py
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