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[BUG] Tools incompatible with Bedrock GPT OSS #799

@brianloyal

Description

@brianloyal

Checks

  • I have updated to the lastest minor and patch version of Strands
  • I have checked the documentation and this is not expected behavior
  • I have searched ./issues and there are no duplicates of my issue

Strands Version

1.7.0

Tools Package Version

0.2.6

Tools used

  1. Calculator

Python Version

3.13

Operating System

macOS 15.6.1

Installation Method

pip

Steps to Reproduce

  1. Install strands with uv add strands-agents strands-agents-tools
  2. Set up AWS credentials for us-west-2.
  3. Run attached agent example with uv run error.py. Agent calls custom tool correctly, without error
  4. Replace custom tool with built-in calculator tool on line 20
  5. Run agent again. Agent fails execution with strands.types.exceptions.EventLoopException: An error occurred (ValidationException) when calling the ConverseStream operation: This model doesn't support the reasoningContent.reasoningText.signature field. Remove reasoningContent.reasoningText.signature and try again.

error.py

Expected Behavior

Agent returns proper even response with current_tool_use objects.

Actual Behavior

Agent returns error

Additional Context

No response

Possible Solution

No response

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