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 your business (data, process and software) with AI Agents using MCP and idiomatic Clojure.

Rationale

• Complete: Enjoy 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?

• Editor Code Assistant
• Nubank
• <Using PluMCP? Tell us!> (Need invite?)

Funding and Support

Show your support, star the Github repo!

You can sponsor this project via Github Sponsors

Development

There are Makefile targets for various development tasks:

Setup and teardown:

make setup
make clean
make distclean  # needs `make setup` later

Running tests:

make clj-test   # run tests in Clojure/JVM
make cljs-test  # run tests in Node.js

Module release:

# Edit `module-project-clj.bb` for version
make install-all-modules
make clean-all-modules

License

Copyright © 2025-2026 Shantanu Kumar

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.