PluMCP

Model Context Protocol (MCP) SDK for Java and JavaScript runtimes. Build MCP clients and servers using Clojure/ClojureScript.

PluMCP is a low-dependency Clojure/ClojureScript library for making MCP clients and servers. Connect AI Agents with your business (data, process and software) using MCP and idiomatic Clojure.

Supported platforms

Java (21 or higher) GraalVM (25 or higher) Node.js (21 or higher) Bun.js (1.3.5 or higher) JavaScript (ES6 or higher)

Why consider PluMCP?

Complete: Enjoy almost all non-deprecated MCP features and transports
Reach: Clojure/ClojureScript reaches Java/JavaScript eco-systems
Ergonomic: User-friendly API, automatic error-checking
Light: Low dependency, Bring your own dependency
Flexible: Composable design with configurable/overridable defaults
Secure: OAuth 2.1 integrated with Streamable HTTP transport

Who is using PluMCP?

Are you using PluMCP? TELL-US!

Status

Protocol version: 2025-06-18, 2025-03-26 (TODO: 2025-11-25)
Protocol implementation: Asynchronous, Full-duplex, Concurrent
Features: All non-deprecated client/server features supported
Transports: STDIO, Streamable HTTP (optionally with OAuth 2.1)

Transports

Platform	STDIO	Streamable HTTP	Streamable HTTP+OAuth 2.1
Clojure/JVM MCP server	Yes	Yes	Yes
Clojure/JVM MCP client	Yes	Yes	Yes
ClojureScript/NodeJS MCP server	Yes	Yes	Yes
ClojureScript/NodeJS MCP client	Yes	Yes	Yes
ClojureScript/Browser MCP client	--	Yes	With customization only

License

This program and the accompanying materials are made available under the terms of the Eclipse Public License 1.0 which is available at https://www.eclipse.org/legal/epl/epl-v10.html.