Issues

• [v2] createMcpHandler legacy fallback misses an abort that happens before it subscribes

  v2
  modelcontextprotocol/typescript-sdk#3136 · Filter by author mariano-aguero opened on Oct 30, 2026

• [v2] Client.connect(): signal is ignored during the server/discover probe

  v2
  modelcontextprotocol/typescript-sdk#3133 · Filter by author Floriferous opened on Oct 30, 2026
  1

• [v2] Unnecessary zod schema conversion

  v2
  modelcontextprotocol/typescript-sdk#3132 · Filter by author phawxby opened on Oct 30, 2026

• createMcpHonoApp: JSON body middleware has a size limit but no time limit (stalled body holds the request open)

  v1v2
  modelcontextprotocol/typescript-sdk#3131 · Filter by author timeleft-- opened on Oct 29, 2026
  1

• subscriptions/listen: let extensions add filter fields and events (Tasks taskIds)

  v2
  modelcontextprotocol/typescript-sdk#3127 · Filter by author sacha-ichbiah opened on Oct 29, 2026

• createMcpHandler: Mcp-Param header validation and scope challenges only run when the factory returns an McpServer

  v2
  modelcontextprotocol/typescript-sdk#3126 · Filter by author sacha-ichbiah opened on Oct 29, 2026
  1

• 5 ready fixes available as PRs (blocked from opening)

  v1v2
  modelcontextprotocol/typescript-sdk#3125 · Filter by author nikolas-sapa opened on Oct 29, 2026

• [v2] requireBearerAuth: drop error="invalid_token" when no credentials were sent and resource_metadata is set (RFC 6750 §3.1)

  v2
  modelcontextprotocol/typescript-sdk#3124 · Filter by author abubakar2906 opened on Oct 29, 2026
  1

• [v2] Test suite fails on Windows: 3 independent causes (CRLF checkout, symlink EPERM, POSIX signals)

  v2
  modelcontextprotocol/typescript-sdk#3117 · Filter by author DoroteoNavarrete opened on Oct 27, 2026
  4

• The maxToolInputElements refusal lacks the Input validation error: prefix that the schema refusal carries

  v1v2
  modelcontextprotocol/typescript-sdk#3111 · Filter by author mihai-r-lupu opened on Oct 27, 2026
  3

• server: registeredResource.update and registeredResourceTemplate.update desync title and metadata.title when updating metadata alone

  v1v2
  modelcontextprotocol/typescript-sdk#3103 · Filter by author shafiktanbir opened on Oct 26, 2026
  5

• server: memorySkillFiles.list() and read() do not normalize or validate non-canonical relative paths

  v2
  modelcontextprotocol/typescript-sdk#3102 · Filter by author shafiktanbir opened on Oct 26, 2026
  2

• [v2] A response that arrives after its request was cancelled raises onerror

  v2
  modelcontextprotocol/typescript-sdk#3097 · Filter by author subhashpolisetti opened on Oct 25, 2026
  1

• isProvablyObjectShapedRoot does not recognize $defs/$ref to typeless object-shaped schemas (e.g. named discriminatedUnion)

  v2
  modelcontextprotocol/typescript-sdk#3094 · Filter by author shafiktanbir opened on Oct 24, 2026
  1

• [v1.x] Protocol.request keeps its abort listener after the request resolved, so a later abort sends notifications/cancelled for an answered request (1.30.0)

  v1
  modelcontextprotocol/typescript-sdk#3090 · Filter by author roundai-kiril opened on Oct 23, 2026
  2

• [v2] Client.connect(): timeout and signal do not bound the notifications/initialized POST

  v1v2
  modelcontextprotocol/typescript-sdk#3078 · Filter by author JarvisMaxDev opened on Oct 23, 2026
  2

• [v2] Client accepts a parent-path protected resource metadata, is this intended given RFC 9728?

  v2
  modelcontextprotocol/typescript-sdk#3077 · Filter by author PhysicallyActive opened on Oct 23, 2026
  3

• [v2] Response cache accepts pre-reset generation-0 writes after reconnect

  v2
  modelcontextprotocol/typescript-sdk#3075 · Filter by author ilovvveu opened on Oct 23, 2026
  1

• StdioClientTransport.close() doesn't clean up listeners, causing EventEmitter memory leak warning

  v1v2
  modelcontextprotocol/typescript-sdk#3070 · Filter by author amd-clb opened on Oct 22, 2026
  3

• [v2] Expose the JSON-RPC request id to callers of request() (onRequestId)

  v1v2
  modelcontextprotocol/typescript-sdk#3061 · Filter by author DanielSLew opened on Oct 21, 2026
  1

• [v2] Expose per-request stream end (onRequestStreamEnd) in RequestOptions for custom long-lived requests

  v1v2
  modelcontextprotocol/typescript-sdk#3060 · Filter by author DanielSLew opened on Oct 21, 2026
  1

• McpServer.connect() Appears to Return null/undefined with Per-Request Server Instantiation and await; Leads to "Method not found"

  v1
  modelcontextprotocol/typescript-sdk#3058 · Filter by author M-ldhfodh opened on Oct 20, 2026
  2

• [v2] Streamable HTTP client never re-initializes after server 404 "session not found" — needs maintainer call on era architecture

  v1v2
  modelcontextprotocol/typescript-sdk#3056 · Filter by author xyonium opened on Oct 20, 2026
  1

• Streamable HTTP: the POST for a cancelled request never settles

  v1v2
  modelcontextprotocol/typescript-sdk#3053 · Filter by author dannote opened on Oct 19, 2026
  10

• [v2] e2e protocol:timeout:max-total is flaky over SSE: fake timers advance before the request reaches the server

  v1v2
  modelcontextprotocol/typescript-sdk#3045 · Filter by author JQ100 opened on Oct 18, 2026