Dubbo MCP Integration

[RainYuY]

What is the purpose of the change?

Ref: #15332

Checklist

• Make sure there is a GitHub_issue field for the change.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 37.81842% with 952 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.73%. Comparing base (a7b641f) to head (6018a5a).

Files with missing lines	Patch %	Lines
...transport/DubboMcpStreamableTransportProvider.java	28.53%	228 Missing and 20 partials ⚠️
...va/org/apache/dubbo/mcp/core/McpServiceFilter.java	12.00%	153 Missing and 1 partial ⚠️
...ache/dubbo/mcp/tool/DubboOpenApiToolConverter.java	30.09%	120 Missing and 24 partials ⚠️
...pache/dubbo/mcp/tool/DubboServiceToolRegistry.java	57.61%	71 Missing and 18 partials ⚠️
...ava/org/apache/dubbo/mcp/util/TypeSchemaUtils.java	51.38%	77 Missing and 11 partials ⚠️
...e/dubbo/mcp/core/McpApplicationDeployListener.java	25.43%	81 Missing and 4 partials ⚠️
...bo/mcp/transport/DubboMcpSseTransportProvider.java	61.72%	30 Missing and 1 partial ⚠️
...pache/dubbo/mcp/core/McpServiceExportListener.java	48.14%	25 Missing and 3 partials ⚠️
...g/apache/dubbo/mcp/tool/DubboMcpGenericCaller.java	47.16%	25 Missing and 3 partials ⚠️
...java/org/apache/dubbo/config/nested/McpConfig.java	0.00%	23 Missing ⚠️
... and 5 more

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #15406      +/-   ##
============================================
- Coverage     61.02%   60.73%   -0.29%     
- Complexity    11685    11715      +30     
============================================
  Files          1923     1937      +14     
  Lines         87081    88612    +1531     
  Branches      13115    13378     +263     
============================================
+ Hits          53141    53819     +678     
- Misses        28488    29258     +770     
- Partials       5452     5535      +83     

Flag	Coverage Δ
integration-tests-java21	32.38% <1.37%> (-0.60%)	⬇️
integration-tests-java8	32.40% <0.39%> (-0.55%)	⬇️
samples-tests-java21	32.04% <1.17%> (-0.58%)	⬇️
samples-tests-java8	29.83% <0.19%> (-0.53%)	⬇️
unit-tests-java11	58.98% <17.64%> (-0.01%)	⬇️
unit-tests-java17	58.49% <37.49%> (-0.28%)	⬇️
unit-tests-java21	58.49% <37.49%> (-0.27%)	⬇️
unit-tests-java8	58.98% <17.64%> (-0.03%)	⬇️

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[RainYuY]

PTAL @AlbumenJ @CrazyHZM

[wcy666103]

There are many Chinese comments in the change commit.

[RainYuY]

There are many Chinese comments in the change commit.

Done.Translation completed.

[SpursJiang]

Dear Dubbo team:
Once a Dubbo service interface is registered as an MCP (Mesh Control Plane) tool, is its metadata stored exclusively in local memory? Furthermore, are there any plans to register MCP tools with the MCP register in Nacos version 3?
Is the Streamable HTTP protocol supported?

[zrlw]

There are many Chinese comments in the change commit.

Done.Translation completed.

no, there are still chinese comments. i.e. McpConstant.java

[RainYuY]

There are many Chinese comments in the change commit.

Done.Translation completed.

no, there are still chinese comments. i.e. McpConstant.java

You're right. done.

[RainYuY]

Dear Dubbo team: Once a Dubbo service interface is registered as an MCP (Mesh Control Plane) tool, is its metadata stored exclusively in local memory? Furthermore, are there any plans to register MCP tools with the MCP register in Nacos version 3? Is the Streamable HTTP protocol supported?

1. Is its metadata stored exclusively in local memory? Yes.

2. Furthermore, are there any plans to register MCP tools with the MCP registry in Nacos version 3? Under consideration.

3. Is the Streamable HTTP protocol supported? No, but I believe we will support it in the future.Now just sse.

[Copilot]

Pull Request Overview

This PR introduces Model Context Protocol (MCP) integration for Dubbo, allowing Dubbo services to be exposed as MCP tools for AI agents and large language models. The implementation provides HTTP-based transport support through both Server-Sent Events (SSE) and streamable protocols.

• Adds a new dubbo-mcp plugin module that integrates Dubbo with the Model Context Protocol
• Implements MCP transport providers supporting both SSE and streamable communication patterns
• Provides tools for automatically converting Dubbo services to MCP tool specifications using OpenAPI definitions

Reviewed Changes

Copilot reviewed 53 out of 53 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
pom.xml	Adds dubbo-mcp module to build and creates conditional profiles for Java 17+
dubbo-plugin/dubbo-mcp/pom.xml	Defines dependencies for MCP SDK, OpenAPI support, and configuration management
dubbo-plugin/dubbo-mcp/src/main/java/	Core MCP implementation including service filters, transport providers, and tool registry
dubbo-remoting/dubbo-remoting-http12/	Adds NOT_ACCEPTABLE HTTP status and RPC context response header support
dubbo-plugin/dubbo-qos/pom.xml	Adds log4j-api dependency
dubbo-distribution/	Updates BOM and all distributions to include dubbo-mcp dependency

resolved

[RainYuY]

@zrlw @AlbumenJ @CrazyHZM @songxiaosheng @heliang666s @EarthChen PTAL