fix: upgrade @modelcontextprotocol/sdk to v1.17.2 for critical transport handling fix#96
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quuu merged 1 commit intovercel:mainfrom Sep 10, 2025
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…ing fix Upgrades the MCP SDK to version 1.17.2 which includes a critical fix for transport handling in multi-client scenarios. The previous SDK version had a bug where the Protocol class would overwrite its transport reference, causing responses to be sent to the wrong client when multiple clients were connected. This was particularly problematic for StreamableHTTP transport in production environments. The fix ensures that each request maintains its proper transport context through closure capture, guaranteeing responses are sent to the correct client. All existing tests pass with the new version, confirming compatibility. Related: modelcontextprotocol/typescript-sdk#820
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this is great! cc @allenzhou101 |
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Summary
Upgrades
@modelcontextprotocol/sdkpeer dependency to v1.17.2 to incorporate a critical bug fix for transport handling in multi-client scenarios.Problem
The previous SDK version (^1.12.0) contained a bug where the Protocol class would overwrite its internal transport reference when handling concurrent requests from multiple clients. This caused responses to be incorrectly routed to the wrong client connection.
This issue particularly affected production deployments using StreamableHTTP transport where multiple clients connect to the same server instance.
Solution
The SDK v1.17.2 includes the fix from modelcontextprotocol/typescript-sdk#820 which ensures proper transport context isolation by capturing the transport reference at request time through closure.
Compatibility
✅ No breaking changes affecting mcp-adapter
Impact
Testing
Related Issues