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Python SDK v2

enhancementNew feature or requestNew feature or request

feature requestRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supported

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

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

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.

#1253 In modelcontextprotocol/python-sdk;

· Kludex opened on Aug 9, 2025

Improved Trio support

needs more eyesNeeds alignment among maintainers whether this is something we want to addNeeds alignment among maintainers whether this is something we want to add

pending dependency updatesThis change depends on updates to dependenciesThis change depends on updates to dependencies

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: Draft (not ready).

modelcontextprotocol/python-sdknumber 946

#946 In modelcontextprotocol/python-sdk;

· agronholm opened on Jun 12, 2025

Add CORS middleware to Starlette app for frontend support

enhancementNew feature or requestNew feature or request

needs more workNot ready to be merged yet, needs additional changes.Not ready to be merged yet, needs additional changes.

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: Draft (not ready).

modelcontextprotocol/python-sdknumber 1201

#1201 In modelcontextprotocol/python-sdk;

· SmartManoj opened on Jul 26, 2025

fix: Handle SSE Disconnects Properly When use starlette middleware

needs more workNot ready to be merged yet, needs additional changes.Not ready to be merged yet, needs additional changes.

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: Draft (not ready).

modelcontextprotocol/python-sdknumber 1222

#1222 In modelcontextprotocol/python-sdk;

· wenxuwan opened on Jul 31, 2025

fix: update response status code for invalid session ID in HTTPSessionManger

breaking changeWill break existing deployments when updated without changesWill break existing deployments when updated without changes

bugSomething isn't workingSomething isn't working

improves spec complianceWhen a change improves ability of SDK users to comply with spec definitionWhen a change improves ability of SDK users to comply with spec definition

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: Draft (not ready).

modelcontextprotocol/python-sdknumber 1395

#1395 In modelcontextprotocol/python-sdk;

· Bumshakalaka opened on Sep 24, 2025

Validate metadata keys

breaking changeWill break existing deployments when updated without changesWill break existing deployments when updated without changes

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 (in progress).

modelcontextprotocol/python-sdknumber 1397

#1397 In modelcontextprotocol/python-sdk;

· samchenatti opened on Sep 24, 2025

mcp.types.Tool is not following python's naming convention

code qualityno-op changes to code qualityno-op changes to code quality

enhancementNew feature or requestNew feature or request

P3Nice to haves, rare edge casesNice to haves, rare edge cases

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

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.

#97 In modelcontextprotocol/python-sdk;

· santosflores opened on Dec 11, 2024

Lifespan enters and exits for each request when stateless_http=True

enhancementNew feature or requestNew feature or request

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.

#1304 In modelcontextprotocol/python-sdk;

· savvaki opened on Aug 24, 2025

Specific transports could be Python package extras

enhancementNew feature or requestNew feature or request

feature requestRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supported

P3Nice to haves, rare edge casesNice to haves, rare edge cases

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

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.

#3 In modelcontextprotocol/python-sdk;

· dsp-ant opened on Sep 25, 2024

Excessive use of generics

enhancementNew feature or requestNew feature or request

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

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

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.

#1207 In modelcontextprotocol/python-sdk;

· samuelcolvin opened on Jul 28, 2025

Type system complexity creating developer friction and maintenance overhead

enhancementNew feature or requestNew feature or request

P3Nice to haves, rare edge casesNice to haves, rare edge cases

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

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.

#837 In modelcontextprotocol/python-sdk;

· davenpi opened on May 29, 2025

FastMCP 2.0 vs MCP Python SDK Server

breaking changeWill break existing deployments when updated without changesWill break existing deployments when updated without changes

feature requestRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supported

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

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

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.

#1068 In modelcontextprotocol/python-sdk;

· AaronLeon opened on Jul 1, 2025