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[v2] versionNegotiation: 2xx server/discover response with an empty or unparseable body fails connect() instead of falling back to legacy initialize

v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixesIdeas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

Status: Open.

#2619 In modelcontextprotocol/typescript-sdk;

· claude opened on Aug 6, 2026

[v2] Legacy Streamable HTTP reconnects continue after the client request times out

v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixesIdeas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

Status: Open.

#2615 In modelcontextprotocol/typescript-sdk;

· teamleaderleo opened on Aug 5, 2026

Client.listTools() corrupts its cached tool metadata when an output schema fails to compile

Status: Open.

#2614 In modelcontextprotocol/typescript-sdk;

· sebthom opened on Aug 4, 2026

Client.callTool() throws -32602 after tools/list_changed replaces an in-flight call's output schema

Status: Open.

#2612 In modelcontextprotocol/typescript-sdk;

· sebthom opened on Aug 4, 2026

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

Status: Open.

#2607 In modelcontextprotocol/typescript-sdk;

· blakebauman opened on Aug 2, 2026

Memory leak: AjvJsonSchemaValidator.getValidator() recompiles schemas without $id on every call

Status: Open.

#2605 In modelcontextprotocol/typescript-sdk;

· UberBlackCat opened on Aug 2, 2026

CODEOWNERS auth paths do not resolve on main, so the auth team is never auto-requested

Status: Open.

#2604 In modelcontextprotocol/typescript-sdk;

· conorbronsdon opened on Aug 2, 2026

v2: extension methods shadowed by legacy spec-method registry — custom tasks/get & tasks/cancel handlers unreachable (-32601 before handler lookup)

Status: Open.

#2598 In modelcontextprotocol/typescript-sdk;

· czh2774 opened on Aug 1, 2026

OAuth: isLoopbackHost rejects *.localhost subdomains, breaking host-based local dev (InsecureTokenEndpointError)

v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixesIdeas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

Status: Open.

#2591 In modelcontextprotocol/typescript-sdk;

· solirpa opened on Jul 31, 2026

[v2] createMcpHandler accepts modern POST without required MCP-Protocol-Version

Status: Open.

#2589 In modelcontextprotocol/typescript-sdk;

· allenzhou101 opened on Jul 30, 2026

_onprogress raises a protocol error for a race servers cannot avoid (progress notification arriving with the response)

Status: Open.

#2580 In modelcontextprotocol/typescript-sdk;

· sweetrb opened on Jul 30, 2026

Implement SEP-1933: Workload Identity Federation (Extension)

Status: Open.

#2576 In modelcontextprotocol/typescript-sdk;

· coding-bobo opened on Jul 29, 2026