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Python: [Bug]: BedrockChatClient drops reasoningContent, so extended thinking with tool calls fails #8935
Description
Description
BedrockChatClient currently ignores reasoningContent in Converse responses, streaming responses, and conversation history. Because of this, the model's reasoning is not returned as text_reasoning. This causes an issue with extended thinking and tool calls: when sending the next request after a tool call, the signed reasoning block is missing. Bedrock requires this block to be sent back along with the tool_use block, otherwise the request can fail.
Code Sample
client = BedrockChatClient(model="anthropic.claude-sonnet-4-...")
response = client._process_converse_response({
"output": {"message": {"role": "assistant", "content": [
{"reasoningContent": {"reasoningText": {"text": "Need the tool.", "signature": "sig"}}},
{"toolUse": {"toolUseId": "call-1", "name": "get_weather", "input": {}}},
]}},
})
print([c.type for c in response.messages[0].contents])
# ['function_call'] <- the reasoning block is lostError Messages / Stack Traces
No error at parse time. The reasoning is silently dropped, and the follow-up Converse call after a tool call is rejected by Bedrock when extended thinking is enabled.Package Versions
agent-framework-core: 1.19.0, agent-framework-bedrock: (current main)
Python Version
Python 3.11.15
Additional Context
No response
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github-actions commentedon Oct 1, 2026
🤖 Automated triage reproduction notes (agent-authored — trust but verify)
Agent analysis
Repro:
python/packages/bedrock/agent_framework_bedrock/_chat_client.py::_parse_message_contentsdropsreasoningContent.reasoningTextwhen it accompaniestoolUse, leaving onlyfunction_call. Minimal repro: pass the issue payload to_process_converse_responseand assert content types aretext_reasoningandfunction_call; the added test fails with actual['function_call']._process_converse_stream_eventand_convert_content_to_bedrock_blocklikewise contain no reasoning handling.python/packages/bedrock/tests/test_bedrock_client.pyagent-framework-core 1.19.0agent-framework-bedrock 1.0.0b260918