This Quarkus extension provides both declarative and programmatic APIs that enable developers to easily implement MCP1 server features.
Note
The LangChain4j project provides the MCP client functionality, either as a low-level programmatic API or as a full-fledged integration into AI-infused applications.
Add the following dependency to your POM file:
<dependency> <groupId>io.quarkiverse.mcp</groupId> <!-- use 'quarkus-mcp-server-stdio' if you want to use the STDIO transport instead of the HTTP/SSE transport --> <artifactId>quarkus-mcp-server-sse</artifactId> <version>${project-version}</version> </dependency>Add server features (prompts, resources and tools) represented by annotated business methods of CDI beans.
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(description = "Converts the string value to lower case") String toLowerCase(String value) { return 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(RequestUri uri) throws IOException{ return BlobResourceContents.create(uri.value(), Files.readAllBytes(Path.of("alpha.txt"))); } }Run your Quarkus app and have fun!
The full documentation is available at https://quarkiverse.github.io/quarkiverse-docs/quarkus-mcp-server/dev/index.html.
Thanks goes to these wonderful people (emoji key):
 Martin Kouba 💻 🚧 |  Georgios Andrianakis 💻 |  Max Rydahl Andersen 💡 |  Rostislav Svoboda 💻 |  George Gastaldi 🚇 |  Jan Martiska 📖 |  Ioannis Canellos 💻 |
 Sergey Beryozkin 💡 |  Konstantin Pavlov |  Martijn van Duijnhoven 💻 |
This project follows the all-contributors specification. Contributions of any kind welcome!
Footnotes
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"Model Context Protocol (MCP) is an open protocol that enables seamless integration between LLM applications and external data sources and tools." ↩
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