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Test run

TypeScript MCP SDK

Duplicate Response

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ImplementationTypeScript MCP SDKv1.30.0

StatusPassed

TransportHTTP

TestedSep 26, 2026

Durationnull ms

Observations

Recorded behavior from this compatibility test.

Error callback reported a response for an unknown ID
Same-session ping succeeded after the duplicate response.

Run details

Scenario: Duplicate Response
Category: protocol
Version: 1.30.0
Run ID: test-run-0-10-0-typescript-mcp-sdk-1-30-0-streamable-http-duplicate-response

Implementation repository

MCP compatibility data, with evidence and limitations in context.

Methodology & limitations Source code MCP Failure Lab

TypeScript MCP SDK: Duplicate Response | MCP Failure Observatory