typescript-sdk · Issues· 619 open

[v2] Server-side hook for subscriptions/listen resource subscriptions (attach/detach per URI)

createMcpHandler: reused McpServer instance grows an unbounded onclose chain — memory leak, then uncatchable RangeError after ~20k requests

ResourceTemplate fails when user selects <Empty> for optional parameter

MCP servers deployed on AWS Lambda Function URLs stopped working after upgrading from v1.24.2 to v1.25.0+

Claude.AI hangs with 408 timeout when MCP tool response JSON contains U+2028 (LINE SEPARATOR) or U+2029 (PARAGRAPH SEPARATOR)

Streamable HTTP SSE tests assume multiple events share one fetch chunk

Add first-class SEP-2640 Skills extension APIs

[v2] _resetTimeout never updates startTime, so totalElapsed keeps accumulating from the original

[v2] Should raise error at build time if zod outputSchema is not consistent with the structuredContent type

Where does validation of a peer's declarations belong? Four things the client accepts today

outputSchema always emitted as JSON Schema draft-07, breaking clients that only accept 2020-12

A handler that throws McpError produces a double-prefixed message on the client

License metadata clarification for server/core 2.0.0

Transport errors are reported only on onerror; awaiting callers always get "MCP error -32000: Connection closed"

stderr: 'pipe' deadlocks the session if the consumer never reads transport.stderr