feat: add meta field support to MCP tool results #1237
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Add support for the _meta field in MCP tool results to enable MCP servers to pass arbitrary metadata alongside tool outputs. This allows tracking of token usage, performance metrics, and other business-specific information. Changes: - Add meta field to MCPToolResult TypedDict - Update _handle_tool_result to extract and pass through meta field - Add comprehensive tests for meta field handling - Handle MCP SDK's _meta field aliasing via model_dump() Closes strands-agents#881
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Description
Add support for the _meta field in MCP tool results to enable MCP servers to pass arbitrary metadata alongside tool outputs. This allows tracking of token usage, performance metrics, and other business-specific information.
Changes:
Related Issues
Closes #881
Documentation PR
Type of Change
New feature
Testing
How have you tested the change? Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli
hatch run prepareChecklist
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