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Python: Filter framework kwargs from MCP tool invocations (#2870)

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* Filter framework kwargs from MCP tool invocations

* Fixes
This commit is contained in:
Evan Mattson
2025-12-16 10:10:09 +09:00
committed by GitHub
Unverified
parent e0ff153ee9
commit 0dcebc6eae
1 changed files with 9 additions and 1 deletions
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python/packages/core/agent_framework/_mcp.py
+9 -1
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@@ -685,8 +685,16 @@ class MCPTool:
raise ToolExecutionException(
"Tools are not loaded for this server, please set load_tools=True in the constructor."
)
# Filter out framework kwargs that cannot be serialized by the MCP SDK.
# These are internal objects passed through the function invocation pipeline
# that should not be forwarded to external MCP servers.
filtered_kwargs = {
k: v for k, v in kwargs.items() if k not in {"chat_options", "tools", "tool_choice", "thread"}
}
try:
return _mcp_call_tool_result_to_ai_contents(await self.session.call_tool(tool_name, arguments=kwargs))
return _mcp_call_tool_result_to_ai_contents(
await self.session.call_tool(tool_name, arguments=filtered_kwargs)
)
except McpError as mcp_exc:
raise ToolExecutionException(mcp_exc.error.message, inner_exception=mcp_exc) from mcp_exc
except Exception as ex: