Quarkus Model Context Protocol (MCP) Server

"Model Context Protocol (MCP) is an open protocol that enables seamless integration between LLM applications and external data sources and tools."

This extension provides a declarative API that enables developers to implement the MCP server features easily.

Get Started

Step #1 - add the following dependency to your POM file:

<dependency>
    <groupId>io.quarkiverse.mcp</groupId>
    <artifactId>quarkus-mcp-server-sse</artifactId> <!-- use 'quarkus-mcp-server-stdio' if you want to use the STDIO transport instead of the SSE transport -->
    <version>${project-version}</version>
</dependency>

Step #2 - add server features (prompts, resources and tools) represented by an annotated business method of a CDI bean.

import jakarta.inject.Inject;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

import io.quarkiverse.mcp.server.BlobResourceContents;
import io.quarkiverse.mcp.server.Prompt;
import io.quarkiverse.mcp.server.PromptArg;
import io.quarkiverse.mcp.server.PromptMessage;

import io.quarkiverse.mcp.server.Tool;
import io.quarkiverse.mcp.server.Resource;
import io.quarkiverse.mcp.server.TextContent;

// This class is automatically registered as a @Singleton CDI bean
public class ServerFeatures {

    @Inject
    CodeService codeService;

    @Tool
    TextContent toLowerCase(String value) {
        return new TextContent(value.toLowerCase());
    }

    @Prompt(name = "code_assist")
    PromptMessage codeAssist(@PromptArg(name = "lang") String language) {
        return PromptMessage.withUserRole(new TextContent(codeService.assist(language)));
    }

    @Resource(uri = "file:///project/alpha")
    BlobResourceContents alpha(String uri) throws IOException{
        return BlobResourceContents.create(uri, Files.readAllBytes(Paths.ALPHA));
    }

}

Step #3 - run your Quarkus app!

Read the full documentation.

Contributors ✨

Thanks goes to these wonderful people (emoji key):

Martin Kouba 💻 🚧

Georgios Andrianakis 💻

Max Rydahl Andersen 💡

This project follows the all-contributors specification. Contributions of any kind welcome!