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client's <code>read_stream_writer</code> open after SSE disconnection hanging <code>.receive()</code>

Status: Open.

#1811 In modelcontextprotocol/python-sdk;

· ivanbelenky opened on Dec 21, 2025

Support for multiple workers in the same process

Status: Open.

#1809 In modelcontextprotocol/python-sdk;

· lazka opened on Dec 20, 2025

More control over stderr in stdio client

Status: Open.

#1806 In modelcontextprotocol/python-sdk;

· sesajad opened on Dec 19, 2025

Possible ressource leak / race condition in streamable_http_client

Status: Open.

#1805 In modelcontextprotocol/python-sdk;

· h-filzer opened on Dec 19, 2025

Implement server-side support for Client ID Metadata Documents (CIMD)

authIssues and PRs related to Authentication / OAuth Issues and PRs related to Authentication / OAuth

enhancementRequest for a new feature that's not currently supported Request for a new feature that's not currently supported

P0Broken core functionality, security issues, critical missing feature Broken core functionality, security issues, critical missing feature

ready for workEnough information for someone to start working on Enough information for someone to start working on

Status: Open.

#1801 In modelcontextprotocol/python-sdk;

· maxisbey opened on Dec 18, 2025

Guide: Resolving "421 Invalid Host Header" (DNS Rebinding Protection)

documentationImprovements or additions to documentation Improvements or additions to documentation

P2Moderate issues affecting some users, edge cases, potentially valuable feature Moderate issues affecting some users, edge cases, potentially valuable feature

questionFurther information is requested Further information is requested

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

Status: Open.

#1798 In modelcontextprotocol/python-sdk;

· Junyi-99 opened on Dec 17, 2025

Make JSON-RPC ID type coercion configurable

bugSomething isn't working Something isn't working

P3Nice to haves, rare edge cases Nice to haves, rare edge cases

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

Status: Open.

#1795 In modelcontextprotocol/python-sdk;

· maxisbey opened on Dec 17, 2025

Consider extensible pattern for protocol flow-control exceptions

enhancementRequest for a new feature that's not currently supported Request for a new feature that's not currently supported

P2Moderate issues affecting some users, edge cases, potentially valuable feature Moderate issues affecting some users, edge cases, potentially valuable feature

ready for workEnough information for someone to start working on Enough information for someone to start working on

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

Status: Open.

#1788 In modelcontextprotocol/python-sdk;

· felixweinberger opened on Dec 15, 2025

Discover OIDC-only authorization servers when PR metadata is absent

authIssues and PRs related to Authentication / OAuth Issues and PRs related to Authentication / OAuth

P2Moderate issues affecting some users, edge cases, potentially valuable feature Moderate issues affecting some users, edge cases, potentially valuable feature

Status: Open.

#1785 In modelcontextprotocol/python-sdk;

· sonmaximum opened on Dec 14, 2025

Support setting title and description for server and client

bugSomething isn't working Something isn't working

P2Moderate issues affecting some users, edge cases, potentially valuable feature Moderate issues affecting some users, edge cases, potentially valuable feature

ready for workEnough information for someone to start working on Enough information for someone to start working on

Status: Open.

#1783 In modelcontextprotocol/python-sdk;

· JulianJvn opened on Dec 12, 2025

Proposal: Split Server class into MCPCore (handler management) (tentative name) and Server (runtime)

enhancementRequest for a new feature that's not currently supported Request for a new feature that's not currently supported

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

Status: Open.

#1779 In modelcontextprotocol/python-sdk;

· sreenaths opened on Dec 11, 2025

Fix flaky SSE tests: test_sse_client_basic_connection_mounted_app and test_request_context_isolation

bugSomething isn't working Something isn't working

P3Nice to haves, rare edge cases Nice to haves, rare edge cases

Status: Open.

#1777 In modelcontextprotocol/python-sdk;

· maxisbey opened on Dec 11, 2025