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Add <code>{path}/.well-known/oauth-authorization-server</code> as a discovery URL fallback

Status: Open.

#1944 In modelcontextprotocol/python-sdk;

· jerome3o-anthropic opened on Jan 23, 2026

streamable_http client hangs indefinitely when connecting to POST-only MCP servers (ex: GitHub MCP)

Status: Open.

#1941 In modelcontextprotocol/python-sdk;

· sicoyle opened on Jan 23, 2026

Using transport="stdio" closes real stdio, causing ValueError after server exits

Status: Open.

#1933 In modelcontextprotocol/python-sdk;

· hyn0027 opened on Jan 22, 2026

Trailing slash in OAuthMetadata's <code>issuer</code> causes issues with clients

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

bugSomething isn't working Something isn't working

P1Significant bug affecting many users, highly requested feature Significant bug affecting many users, highly requested feature

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

Status: Open.

#1919 In modelcontextprotocol/python-sdk;

· joar opened on Jan 21, 2026

Sample auth server binds to localhost only — could you allow access via host IP?

Status: Open.

#1913 In modelcontextprotocol/python-sdk;

· lyao-parasoft opened on Jan 20, 2026

Audit and refactor unit tests to use new Client class

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

P1Significant bug affecting many users, highly requested feature Significant bug affecting many users, highly requested feature

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.

#1891 In modelcontextprotocol/python-sdk;

· felixweinberger opened on Jan 16, 2026

Add transport types to Client + infer_transport() for auto-detection

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

P1Significant bug affecting many users, highly requested feature Significant bug affecting many users, highly requested feature

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.

#1889 In modelcontextprotocol/python-sdk;

· felixweinberger opened on Jan 16, 2026

Stateless mode drops HTTP responses for long-running tool calls

Status: Open.

#1886 In modelcontextprotocol/python-sdk;

· tony-nekola-silk opened on Jan 16, 2026

Bug: String parameters starting with digits coerced to numbers, causing UUID data loss

Status: Open.

#1873 In modelcontextprotocol/python-sdk;

· TommyVee opened on Jan 15, 2026

Discussion: Where should MCP protocol version negotiation happen?

Status: Open.

#1861 In modelcontextprotocol/python-sdk;

· ketema opened on Jan 15, 2026

Progressive loading /deferring tool loading

questionFurther information is requested Further information is requested

Status: Open.

#1860 In modelcontextprotocol/python-sdk;

· shiv-codegit opened on Jan 15, 2026

Any request/response-level tracing of server-side json?...e.g. ListToolRequest/ListToolResponse payloads?

questionFurther information is requested Further information is requested

Status: Open.

#1852 In modelcontextprotocol/python-sdk;

· scottslewis opened on Jan 13, 2026