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2026-07-28 spec support — tracking

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2891 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026

Backwards compatibility & version negotiation

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2892 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026

New HTTP serving path (modern + dual-era)

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2893 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026

New Client (all-versions, low-level + high-level)

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2894 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026

Context object (layered, per-request)

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2895 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026

Capabilities API + server/discover handler

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2896 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026

MCPServer as a thin composition of the 2026 helpers

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2897 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026

MRTR (multi-round-trip requests)

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2898 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026

Caching hints (ttlMs / cacheScope)

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2899 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026

HTTP standard headers + x-mcp-header

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2900 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026

subscriptions/listen

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2901 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026

Auth — 2026 client-side requirements

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2902 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026

Spec corrections & deprecation markers

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2904 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026

Test foundations (safety nets)

spec-2026-07-282026-07-28 MCP spec release work2026-07-28 MCP spec release work

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.

#2905 In modelcontextprotocol/python-sdk;

· maxisbey opened on Jun 17, 2026