2.2

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•Last updated Oct 1, 2026

Main goals:

2026-07-28 spec implementation.

Formerly categorized as 3.0

22% complete

SEP-2575: Make MCP Stateless
Enhancement
modelcontextprotocol/java-sdk#1011 · opened on Jun 6, 2026 · 2.2
11
SEP-2567: Sessionless MCP via Explicit State Handles
Enhancement
modelcontextprotocol/java-sdk#1010 · opened on Jun 6, 2026 · 2.2
SEP-2322: Multi Round-Trip Requests
Enhancement
modelcontextprotocol/java-sdk#1004 · opened on Jun 6, 2026 · 2.2
1
SEP-2260: Require Server requests to be associated with a Client request
Enhancement
modelcontextprotocol/java-sdk#1003 · opened on Jun 6, 2026 · 2.2
1
Support extensions SEP-2133
Enhancement
modelcontextprotocol/java-sdk#785 · opened on Feb 13, 2026 · 2.2
1
SEP-2243: HTTP Header Standardization for Streamable HTTP Transport
Enhancement
modelcontextprotocol/java-sdk#990 · opened on May 29, 2026 · 2.2
3
SEP-1865: MCP Apps - Interactive User Interfaces for MCP
modelcontextprotocol/java-sdk#999 · opened on Jun 6, 2026 · 2.2
1
SEP-2106: Tools inputSchema & outputSchema Conform to JSON Schema 2020-12
modelcontextprotocol/java-sdk#1000 · opened on Jun 6, 2026 · 2.2
SEP-2164: Standardize resource not found error code (-32602)
Enhancement
modelcontextprotocol/java-sdk#1001 · opened on Jun 6, 2026 · 2.2
SEP-2352: Clarify authorization server binding and migration
Enhancement
modelcontextprotocol/java-sdk#1007 · opened on Jun 6, 2026 · 2.2
1
SEP-2468: Recommend Issuer (iss) Parameter in MCP Auth Responses
Enhancement
modelcontextprotocol/java-sdk#1008 · opened on Jun 6, 2026 · 2.2
1
SEP-2549: TTL for List Results
Enhancement
modelcontextprotocol/java-sdk#1009 · opened on Jun 6, 2026 · 2.2
1
SEP-2577: Deprecate Roots, Sampling, and Logging
Enhancement
modelcontextprotocol/java-sdk#1012 · opened on Jun 6, 2026 · 2.2
SEP-2663: Tasks Extension
Enhancement
modelcontextprotocol/java-sdk#1013 · opened on Jun 6, 2026 · 2.2
2
fix: standardize resource not found error code
Unread
#1037 opened Jun 24, 2026 · Updated Jun 26, 2026
3
feat(mcp-core): support Mcp-Name header for Streamable HTTP (SEP-2243)
Unread
#994 opened Jun 3, 2026 · Updated Aug 28, 2026
3
Add Primitive repository APIs (ResourceRepository, ToolsRepository, ... )
Enhancement
modelcontextprotocol/java-sdk#578 · opened on Sep 26, 2025 · 2.2
20

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2.2

SEP-2575: Make MCP Stateless

SEP-2567: Sessionless MCP via Explicit State Handles

SEP-2322: Multi Round-Trip Requests

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

Support extensions SEP-2133

SEP-2243: HTTP Header Standardization for Streamable HTTP Transport

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

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

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

SEP-2352: Clarify authorization server binding and migration

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

SEP-2549: TTL for List Results

SEP-2577: Deprecate Roots, Sampling, and Logging

SEP-2663: Tasks Extension

fix: standardize resource not found error code

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

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

Issues