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[v2] Spec mismatch: error when io.modelcontextprotocol/clientInfo is missing

needs confirmationNeeds confirmation that the PR is actually required or needed.Needs confirmation that the PR is actually required or needed.

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.

#2537 In modelcontextprotocol/typescript-sdk;

· tobiasBora opened on Jul 23, 2026

stdio.ts/ReadBuffer retains consumed input and copies the next stdio chunk

Status: Open.

#2536 In modelcontextprotocol/typescript-sdk;

· sebthom opened on Jul 23, 2026

Default JSON Schema validators reject declared draft-07, which the spec permits

Status: Open.

#2532 In modelcontextprotocol/typescript-sdk;

· chelojimenez opened on Jul 21, 2026

Widen @hono/node-server range: ^1.19.9 cannot resolve past GHSA-frvp-7c67-39w9 (no patched 1.x)

Status: Open.

#2531 In modelcontextprotocol/typescript-sdk;

· jqnatividad opened on Jul 21, 2026

[v2] structuredContent with string wrapped in result: mismatch with specification

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.

#2530 In modelcontextprotocol/typescript-sdk;

· tobiasBora opened on Jul 21, 2026

[v2] Allow extensions to participate in subscriptions/listen

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.

#2528 In modelcontextprotocol/typescript-sdk;

· juliangoetze opened on Jul 21, 2026

Bug/Feature Request: Node 26 fetch HTTP/2 SSE stream buffering hangs MCP connections

Status: Open.

#2526 In modelcontextprotocol/typescript-sdk;

· Starefossen opened on Jul 21, 2026

Bug/Feature Request: Node 26 fetch HTTP/2 SSE stream buffering hangs MCP connections

Status: Open.

#2525 In modelcontextprotocol/typescript-sdk;

· Starefossen opened on Jul 21, 2026

[v2] Multiple connect per server

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.

#2515 In modelcontextprotocol/typescript-sdk;

· tobiasBora opened on Jul 18, 2026

Mid-session re-auth after refresh-token expiry dead-ends: send() gets "REDIRECT" and throws UnauthorizedError without ever exchanging the new code

Status: Open.

#2510 In modelcontextprotocol/typescript-sdk;

· evdbogaard opened on Jul 17, 2026

Add a high-level MCP operation interceptor seam

Status: Open.

#2507 In modelcontextprotocol/typescript-sdk;

· khandrew1 opened on Jul 16, 2026

v2: setRequestHandler/setNotificationHandler require a method-string literal — re-accept the schema object (or export typed method tokens)

Status: Open.

#2505 In modelcontextprotocol/typescript-sdk;

· cliffhall opened on Jul 15, 2026