MCP Server

If you already use MCP, the mcp mcp server is the piece that lets your assistant work with it directly. A comprehensive framework for building [Model Context Protocol (MCP)][473e] servers in Common Lisp. This library provides a complete implementation of the MCP specification with an easy-to-use API for creating servers that can interact.

What the server does

• ✅ STDIO Transport: Native support for STDIO-based communication
• ✅ StreamableHTTP Transport: Allowing to create remotely hosted MCP servers
• ✅ Tools System: Register and execute custom tools with JSON Schema validation
• ✅ Built on OpenRPC: Leverages the robust [40ants OpenRPC library][348e]
• ✅ CLOS-based: Object-oriented design with proper encapsulation
• ✅ Easy Integration: Simple API for adding functionality

Available tools

The toolset is worth reading before you wire it up, because it tells you what the integration is really for:

• Features — The Features tool exposed by this server
• Roadmap — The Roadmap tool exposed by this server
• Classes — The Classes tool exposed by this server
• Functions — Start the MCP server with specified transport. TRANSPORT can be :stdio or :http. PORT is only used when transport is :http
• Generics — The Generics tool exposed by this server
• Macros — The Macros tool exposed by this server

Installation

Because this one is hosted, setup is mostly authentication — you point your client at the endpoint and approve access. Nothing runs on your machine, so there is no runtime to keep patched.

Where it fits

This sits in the developer tooling group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. MCP's toolset — Features, Roadmap, Classes and 3 more — is a fair guide to whether it matches your workflow. It is maintained by 40ants; worth a glance at recent repository activity before you build anything load-bearing on it.

This entry was verified against MCP's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.

Worth knowing first

• Your data travels to the provider's service, so the usual questions apply about what you send and what they retain.
• Keep per-call confirmation enabled while you learn its behaviour; it is the cheapest safeguard you have.