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SEP-2575: Make MCP Stateless

area/transport

enhancementNew feature or requestNew feature or request

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

Status: Open.

Enhancement

#1011 In modelcontextprotocol/java-sdk;

· localden opened on Jun 6, 2026

SEP-2567: Sessionless MCP via Explicit State Handles

area/transport

enhancementNew feature or requestNew feature or request

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

Status: Open.

Enhancement

#1010 In modelcontextprotocol/java-sdk;

· localden opened on Jun 6, 2026

SEP-2322: Multi Round-Trip Requests

area/mcp-schema

area/transport

enhancementNew feature or requestNew feature or request

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

Status: Open.

Enhancement

#1004 In modelcontextprotocol/java-sdk;

· localden opened on Jun 6, 2026

SEP-2260: Require Server requests to be associated with a Client request

area/client

enhancementNew feature or requestNew feature or request

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

Status: Open.

Enhancement

#1003 In modelcontextprotocol/java-sdk;

· localden opened on Jun 6, 2026

Support extensions SEP-2133

area/client

area/server

enhancementNew feature or requestNew feature or request

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

Status: Open.

Enhancement

#785 In modelcontextprotocol/java-sdk;

· scottslewis opened on Feb 13, 2026

SEP-2243: HTTP Header Standardization for Streamable HTTP Transport

area/server

area/transport

enhancementNew feature or requestNew feature or request

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

Status: Open.

Enhancement

#990 In modelcontextprotocol/java-sdk;

· caomengxuan666 opened on May 29, 2026

SEP-1865: MCP Apps - Interactive User Interfaces for MCP

enhancementNew feature or requestNew feature or request

extensionsWork relating to MCP extensions - see https://modelcontextprotocol.io/extensions/overviewWork relating to MCP extensions - see https://modelcontextprotocol.io/extensions/overview

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

Status: Open.

#999 In modelcontextprotocol/java-sdk;

· localden opened on Jun 6, 2026

SEP-2106: Tools inputSchema & outputSchema Conform to JSON Schema 2020-12

enhancementNew feature or requestNew feature or request

Status: Open.

#1000 In modelcontextprotocol/java-sdk;

· localden opened on Jun 6, 2026

SEP-2164: Standardize resource not found error code (-32602)

area/server

enhancementNew feature or requestNew feature or request

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

ready for workThe goal is clear and work towards it can be commencedThe goal is clear and work towards it can be commenced

Status: Open.

Enhancement

#1001 In modelcontextprotocol/java-sdk;

· localden opened on Jun 6, 2026

SEP-2352: Clarify authorization server binding and migration

area/authorization

enhancementNew feature or requestNew feature or request

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

ready for workThe goal is clear and work towards it can be commencedThe goal is clear and work towards it can be commenced

Status: Open.

Enhancement

#1007 In modelcontextprotocol/java-sdk;

· localden opened on Jun 6, 2026

SEP-2468: Recommend Issuer (iss) Parameter in MCP Auth Responses

area/authorization

enhancementNew feature or requestNew feature or request

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

ready for workThe goal is clear and work towards it can be commencedThe goal is clear and work towards it can be commenced

Status: Open.

Enhancement

#1008 In modelcontextprotocol/java-sdk;

· localden opened on Jun 6, 2026

SEP-2549: TTL for List Results

area/mcp-schema

enhancementNew feature or requestNew feature or request

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

ready for workThe goal is clear and work towards it can be commencedThe goal is clear and work towards it can be commenced

Status: Open.

Enhancement

#1009 In modelcontextprotocol/java-sdk;

· localden opened on Jun 6, 2026

SEP-2577: Deprecate Roots, Sampling, and Logging

area/client

area/server

enhancementNew feature or requestNew feature or request

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

ready for workThe goal is clear and work towards it can be commencedThe goal is clear and work towards it can be commenced

Status: Open.

Enhancement

#1012 In modelcontextprotocol/java-sdk;

· localden opened on Jun 6, 2026

SEP-2663: Tasks Extension

enhancementNew feature or requestNew feature or request

extensionsWork relating to MCP extensions - see https://modelcontextprotocol.io/extensions/overviewWork relating to MCP extensions - see https://modelcontextprotocol.io/extensions/overview

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

Status: Open.

Enhancement

#1013 In modelcontextprotocol/java-sdk;

· localden opened on Jun 6, 2026

fix: standardize resource not found error code

area/server

do not merge

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

Status: Open (in progress).

modelcontextprotocol/java-sdknumber 1037

#1037 In modelcontextprotocol/java-sdk;

· CrypticCortex opened on Jun 24, 2026

feat: add extensions attribute to ClientCapabilities and ServerCapabilities

do not merge

Status: Open (in progress).

modelcontextprotocol/java-sdknumber 1064

#1064 In modelcontextprotocol/java-sdk;

· YousefHaggy opened on Jul 17, 2026

feat(mcp-core): support Mcp-Name header for Streamable HTTP (SEP-2243)

area/client

area/server

enhancementNew feature or requestNew feature or request

Status: Open (in progress).

modelcontextprotocol/java-sdknumber 994

#994 In modelcontextprotocol/java-sdk;

· cooleditphoto opened on Jun 3, 2026

Add Primitive repository APIs (ResourceRepository, ToolsRepository, ... )

enhancementNew feature or requestNew feature or request

feature/repositories

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

Status: Open.

Enhancement

#578 In modelcontextprotocol/java-sdk;

· sdelamo opened on Sep 26, 2025