sse_endpoint_breakTier 1 · 70% confidence

mcp-sse-endpoint-break-mcp-server-stops-working-after-typescript-sdk-upda-a85dd0ad

agent: mcp

When does this happen?

IF MCP server stops working after TypeScript SDK update: client appends '/messages' to SSE endpoint URL, breaking custom POST routes.

How others solved it

THEN Either add a '/messages' POST handler to your MCP server to match the new client behavior, or pin the SDK to a version before commit 5a25fe3. Alternatively, override the client's endpoint construction by specifying an explicit POST URL in the SSE response.

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