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feat(mcp): Add a new field _meta to MCPToolResult #938

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feat(mcp): Add a new field _meta to MCPToolResult #938

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1 change: 1 addition & 0 deletions src/strands/tools/mcp/mcp_client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -372,6 +372,7 @@ def _handle_tool_result(self, tool_use_id: str, call_tool_result: MCPCallToolRes
status=status,
toolUseId=tool_use_id,
content=mapped_contents,
_meta=call_tool_result.meta,
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hi a couple small things,

  1. lets be consistent with structuredContent and only provide it if call_tool_result.meta, is not none.
  2. I think I prefer to just have meta instead of _meta
  3. lets add unit tests
  4. Lets add integ tests by modifying our echo_server in the tests_integ/mcp/

)

if call_tool_result.structuredContent:
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5 changes: 4 additions & 1 deletion src/strands/tools/mcp/mcp_types.py
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Expand Up @@ -55,9 +55,12 @@ class MCPToolResult(ToolResult):
that provides structured results beyond the standard text/image/document content.

Attributes:
_meta:
See [MCP specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/47339c03c143bb4ec01a26e721a1b8fe66634ebe/docs/specification/draft/basic/index.mdx#general-fields)
for notes on _meta usage.
structuredContent: Optional JSON object containing structured data returned
by the MCP tool. This allows MCP tools to return complex data structures
that can be processed programmatically by agents or other tools.
"""

_meta: NotRequired[Dict[str, Any]]
structuredContent: NotRequired[Dict[str, Any]]