alnzng opened a new pull request, #139:
URL: https://github.com/apache/flink-agents/pull/139

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   * Please add the relevant components in the PR title. E.g., [api], 
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   <!-- Please link the PR to the relevant issue(s). Hotfix doesn't need this. 
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   Linked issue: #129
   
   ### Purpose of change
   
   <!-- What is the purpose of this change? -->
   Integrate Anthropic Chat Model APIs.
   
   ### Tests
   
   Unit tests, also use `chat_model_example` as template to verify the 
Anthropic APIs.
   
   ```
   2025-09-02 11:37:31,357 - INFO - HTTP Request: POST 
https://api.anthropic.com/v1/messages "HTTP/1.1 200 OK"
   2025-09-02 11:37:31,359 - INFO - key: 0002, send_event: 
id=UUID('5445c578-d209-4520-b0d1-ec9b44667df1') 
request=ChatRequestEvent(id=UUID('3f708c50-7d06-4326-ab54-b58091be8b3b'), 
model='creative_chat_model', messages=[ChatMessage(role=<MessageRole.USER: 
'user'>, content='Tell me a joke about cats.', tool_calls=[], extra_args={})]) 
response=ChatMessage(role=<MessageRole.ASSISTANT: 'assistant'>, content="Why 
don't cats play poker in the jungle?\n\nToo many cheetahs! 🐱", tool_calls=[], 
extra_args={})
   2025-09-02 11:37:31,360 - INFO - key: 0002, performing action: 
process_chat_response
   2025-09-02 11:37:31,360 - INFO - key: 0002, send_event: 
id=UUID('6c29e9dc-f5e7-4602-84ce-44e2d0f6686c') output="Why don't cats play 
poker in the jungle?\n\nToo many cheetahs! 🐱"
   0001: The sum of 1 and 2 is 3.
   0002: Why don't cats play poker in the jungle?
   
   Too many cheetahs! 🐱
   ```
   ### API
   
     - ToolRequestEvent: Added optional external_id field for storing original 
tool call IDs from external systems
     (e.g., Anthropic tool_use_id)
     - ChatMessage: Extended content field to support both str and List[Any] 
types, enabling LLM providers to pass
     native content formats while maintaining backward compatibility
   
   ### Documentation
   
   <!-- Should this change be covered by the user documentation?-->
   n/a
   


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