Python: Fix `MCPStreamableHTTPTool` leaking `asyncio.CancelledError` when MCP server is unreachable - #5687

Merged

Tao Chen (TaoChenOSU) merged 7 commits into

microsoft:mainfrom

moonbox3:agent/fix-5667-1

May 7, 2026

Commits on May 7, 2026

fix: wrap asyncio.CancelledError in ToolException in _connect_on_owner (#5667)

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a3b7527
fix(mcp): propagate genuine task CancelledError in connect() (#5667)

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4a85384
fix(mcp): log CancelledError with exc_info before wrapping in ToolException (#5667)

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a0db1c9
Address review feedback for #5667: Python: [Bug]: Error Handling Issue regarding Python MCPStreamableHTTPTool Class
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99a24c3
refactor(_mcp): extract cancellation helper, fix session error msg and exc_info

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d68ff98
refactor: factor out _close_and_check_cancelled helper in _connect_on_owner

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8bda2a8
Address review feedback for #5667: review comment fixes
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ab3f98a