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