Lisp MCP Server
A Model Context Protocol server for Common Lisp, providing JSON-RPC 2.0 communication, REPL evaluation tools, and TCP/stdio transport support
rating : 2.5 points
downloads : 4.6K
What is the Lisp MCP Server?
The Lisp MCP Server is a bridge server that connects the Common Lisp development environment with external tools (such as editors and AI assistants). It implements the Model Context Protocol standard, allowing clients to send Lisp code for evaluation, obtain symbol information, and perform other operations through the JSON-RPC protocol.How to use the Lisp MCP Server?
It's very simple to use: After starting the server, clients can establish a connection with the server through TCP or standard input/output, and then send requests in JSON format to execute Lisp code or call other tools. The server will return the execution results.Use cases
Suitable for scenarios such as AI programming assistant integration, remote Lisp development environments, editor plugin development, automated code evaluation, and testing. Particularly suitable for projects that require integrating the Lisp environment with modern development tools.Main features
REPL code evaluation
Built-in REPL tool that can evaluate Lisp code expressions and return results, supporting the execution of multiple expressions and package environment settings
Multi-transport protocol support
Supports two connection methods: standard input/output (stdio) and TCP, adapting to different integration scenarios
MCP protocol compatibility
Fully supports the Model Context Protocol standard, including core functions such as initialization handshake, tool discovery, and invocation
Structured logging
Provides structured log output in JSON format, supporting log level control for easy debugging and monitoring
Multi-version protocol support
Supports multiple MCP protocol versions to ensure compatibility with different clients
Advantages
Lightweight design with concise code that is easy to understand and extend
Complete implementation of the MCP protocol, compatible with standard clients
Supports both TCP and stdio connection methods for flexible use
Built-in test framework to ensure code quality
Detailed log records for easy problem troubleshooting
Limitations
Currently, the functions are relatively basic, mainly providing code evaluation functionality
Less consideration for security, suitable for use in trusted environments
Depends on a specific Lisp implementation (SBCL) and Quicklisp
Documentation and examples are relatively simple and require a certain technical background
How to use
Environment preparation
Ensure that SBCL 2.x and Quicklisp are installed on the system, and the Common Lisp development environment is configured
Load the server
Load the server system in the Lisp REPL
Start the server
Select a transport method to start the server. The TCP method is suitable for remote connections, and the stdio method is suitable for pipeline communication
Client connection
Use a client that supports the MCP protocol to connect to the server and send an initialization request to establish a connection
Usage examples
Basic code evaluation
Send a simple Lisp expression for evaluation through an MCP client
Execute multiple expressions
Execute multiple Lisp expressions at once and return the result of the last expression
Specify the package environment
Execute code in a specific Lisp package
Frequently Asked Questions
What should I do if the client cannot connect after the server is started?
What causes the code execution to return no result?
How can I view detailed debugging information?
Which Lisp implementations are supported?
How can I extend custom tools?
Related resources
Model Context Protocol official documentation
Official specifications and documentation for the MCP protocol
Common Lisp official website
Official resources for the Common Lisp programming language
SBCL manual
Steel Bank Common Lisp user manual
Project code repository
Server source code and the latest version

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