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Mark SSE transport as deprecated

improves sdk consistencyImproves consistency with other SDKs such as TyepscriptImproves consistency with other SDKs such as Tyepscript

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

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

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.

#2278 In modelcontextprotocol/python-sdk;

· maxisbey opened on Mar 11, 2026

Reject JSON-RPC requests with null id instead of misclassifying as notifications

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

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

Status: Open (in progress).

modelcontextprotocol/python-sdknumber 2075

#2075 In modelcontextprotocol/python-sdk;

· BabyChrist666 opened on Feb 17, 2026

Requests with "id": null silently misclassified as notifications

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

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

Status: Open.

#2057 In modelcontextprotocol/python-sdk;

· clouatre opened on Feb 14, 2026

Fix RFC 8252 Section 7.3 compliance for loopback redirect URIs

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

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

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

Status: Open (in progress).

modelcontextprotocol/python-sdknumber 1934

#1934 In modelcontextprotocol/python-sdk;

· williamomeara opened on Jan 22, 2026

fix: correct unknown tool/prompt/resource error handling

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

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

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

Status: Open (in progress).

modelcontextprotocol/python-sdknumber 1872

#1872 In modelcontextprotocol/python-sdk;

· DePasqualeOrg opened on Jan 15, 2026

Clarify JSON-RPC error code for 'session not found' responses

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

pending SEP approvalWhen a PR is attached as an implementation detail to a SEP, we mark it as such for triage.When a PR is attached as an implementation detail to a SEP, we mark it as such for triage.

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.

#1821 In modelcontextprotocol/python-sdk;

· maxisbey opened on Dec 31, 2025

fix: auto-reinitialize client session on HTTP 404

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

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

Status: Open (in progress).

modelcontextprotocol/python-sdknumber 1818

#1818 In modelcontextprotocol/python-sdk;

· jayhemnani9910 opened on Dec 31, 2025

MCP client doesn't not initialize new session when getting 404 session not found

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

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

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

Status: Open.

#1676 In modelcontextprotocol/python-sdk;

· david-nominal opened on Nov 26, 2025

Add support for _meta attributes in resource contents

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

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

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

Status: Open (in progress).

modelcontextprotocol/python-sdknumber 1638

#1638 In modelcontextprotocol/python-sdk;

· calvingiles opened on Nov 18, 2025

Client notification support

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

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

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

Status: Open (in progress).

modelcontextprotocol/python-sdknumber 1611

#1611 In modelcontextprotocol/python-sdk;

· kylestratis opened on Nov 10, 2025

FastMCP read_resource() returns incorrect error code when resource not found

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

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

Status: Open.

#1579 In modelcontextprotocol/python-sdk;

· fennb opened on Nov 5, 2025

Invalid method names return error code -32602 instead of -32601

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

needs confirmationNeeds confirmation that the PR is actually required or needed.Needs confirmation that the PR is actually required or needed.

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

Status: Open.

#1561 In modelcontextprotocol/python-sdk;

· corv89 opened on Oct 31, 2025