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pkg_version() in Server.create_initialization_options doesn't guard against importlib.metadata.version() returning None

Status: Open.

#3487 In modelcontextprotocol/python-sdk;

· j-brumback opened on Sep 9, 2026

Add SEP-2640 (Skills Extension) protocol support

Status: Open.

#3486 In modelcontextprotocol/python-sdk;

· vijaydeepsinha opened on Sep 9, 2026

MCPServer has no x-mcp-header declaration mechanism and never validates one, so an invalid annotation is served happily and dropped by every client

Status: Open.

#3484 In modelcontextprotocol/python-sdk;

· atsuki-shirasawa opened on Sep 9, 2026

Client never retries after -32020 HeaderMismatch, and there is no public way to pre-load the x-mcp-header map (SEP-2243 client SHOULD/MAY both unimplemented)

Status: Open.

#3483 In modelcontextprotocol/python-sdk;

· atsuki-shirasawa opened on Sep 9, 2026

Simplify src/mcp/shared/metadata_utils.py::get_display_name logic.

Status: Open.

#3480 In modelcontextprotocol/python-sdk;

· StarsExpress opened on Sep 8, 2026

Missing prompt-level _meta support in MCPServer.prompt() and Prompt model

Status: Open.

#3476 In modelcontextprotocol/python-sdk;

· m3chanic opened on Sep 8, 2026

[Bug] Client sends empty _meta:{} on every request; strict servers (Meta Ads MCP) reject with HTTP 400

Status: Open.

#3473 In modelcontextprotocol/python-sdk;

· kokhlo opened on Sep 8, 2026

[v2] Add an end-to-end public-client PKCE server contract

Status: Open.

#3472 In modelcontextprotocol/python-sdk;

· NgoTuong12345 opened on Sep 8, 2026

# TypeScript npm install @modelcontextprotocol/sdk zod # Python pip install mcp

Status: Open.

#3471 In modelcontextprotocol/python-sdk;

· Ik8888 opened on Sep 8, 2026

StreamableHTTP: a client disconnect while reading the POST body is logged as an exception and answered 500

v1Affects the v1.x maintenance lineAffects the v1.x maintenance line

v2Affects the v2 line (2.x on main)Affects the v2 line (2.x on main)

Status: Open.

#3469 In modelcontextprotocol/python-sdk;

· HardMax71 opened on Sep 7, 2026

CallToolResult structuredContent is not alias-normalized to match outputSchema

v1Affects the v1.x maintenance lineAffects the v1.x maintenance line

v2Affects the v2 line (2.x on main)Affects the v2 line (2.x on main)

Status: Open.

#3467 In modelcontextprotocol/python-sdk;

· coder058 opened on Sep 7, 2026

check_resource_allowed treats /api/../admin as under /api

v1Affects the v1.x maintenance lineAffects the v1.x maintenance line

v2Affects the v2 line (2.x on main)Affects the v2 line (2.x on main)

Status: Open.

#3464 In modelcontextprotocol/python-sdk;

· Oskii opened on Sep 6, 2026