Support MCP version 2025-11-25

Expected Behavior

Current MCP spec version "2025-11-25" should be supported and added to ProtocolVersions.java

Current Behavior

Currently, only versions "2024-11-05", "2025-03-26", and "2025-06-18" are supported:

java-sdk/mcp-core/src/main/java/io/modelcontextprotocol/spec/ProtocolVersions.java

Lines 1 to 23 in 082444e

    
           package io.modelcontextprotocol.spec; 
        
           public interface ProtocolVersions { 
        
           	/** 
        
           	 * MCP protocol version for 2024-11-05. 
        
           	 * https://modelcontextprotocol.io/specification/2024-11-05 
        
           	 */ 
        
           	String MCP_2024_11_05 = "2024-11-05"; 
        
           	/** 
        
           	 * MCP protocol version for 2025-03-26. 
        
           	 * https://modelcontextprotocol.io/specification/2025-03-26 
        
           	 */ 
        
           	String MCP_2025_03_26 = "2025-03-26"; 
        
           	/** 
        
           	 * MCP protocol version for 2025-06-18. 
        
           	 * https://modelcontextprotocol.io/specification/2025-06-18 
        
           	 */ 
        
           	String MCP_2025_06_18 = "2025-06-18"; 
        
           }

Tools like modelcontextprotocol/inspector only work with the current spec version (see modelcontextprotocol/inspector#962), and this SDK does not support it.

Context

Trying to debug an MCP server using the MCP inspector tool.

The supported version should only be updated when that version is actually supported.

From my testing using MCP inspector v0.18.0, the tool works fine with protocol version 2025-03-26 returned by the server.

io.modelcontextprotocol.server.McpAsyncServer : Client initialize request - Protocol: 2025-11-25, Capabilities: ClientCapabilities[experimental=null, roots=RootCapabilities[listChanged=true], sampling=Sampling[], elicitation=Elicitation[]], Info: Implementation[name=inspector-client, title=null, version=0.18.0]
io.modelcontextprotocol.server.McpAsyncServer : Client requested unsupported protocol version: 2025-11-25, so the server will suggest the 2025-03-26 version instead

It is planned, absolutely. Please track individual items of interest on the project board as described in our roadmap.

Resolved through #1025. The 2025-11-25 is now implemented.

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Support MCP version 2025-11-25 #715

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	package io.modelcontextprotocol.spec;

	public interface ProtocolVersions {

	/**
	* MCP protocol version for 2024-11-05.
	* https://modelcontextprotocol.io/specification/2024-11-05
	*/
	String MCP_2024_11_05 = "2024-11-05";

	/**
	* MCP protocol version for 2025-03-26.
	* https://modelcontextprotocol.io/specification/2025-03-26
	*/
	String MCP_2025_03_26 = "2025-03-26";

	/**
	* MCP protocol version for 2025-06-18.
	* https://modelcontextprotocol.io/specification/2025-06-18
	*/
	String MCP_2025_06_18 = "2025-06-18";

	}

Support MCP version 2025-11-25 #715

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alexcheng1982 commented on Dec 18, 2025

chemicL commented on Feb 20, 2026

chemicL commented on Jun 11, 2026

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