LightMCP

LightMCP

LightMCP is a lightweight multiplatform MCP stdio-based server written in C++. This server supports very basic protocol functionality for tools/resources creation.

The example executable has no tools by default. There's a plugin system and 2 built-in plugins:

• lua - Arbitrary Lua script execution (enabled by default)
• example - Random number generation + simple resource (disabled by default)
• buzzyfuzzy - Fuzzy search through decompiled CHM file using chm-converter (disabled by default)
• simplemem - Simple temporary cross-chat memory tool (disabled by default, most likely will malfunction in LM Studio since it kills MCP server process if unused)

This project is only tested in LM Studio and llama.cpp environments. Compatibility with other clients is not guaranteed. If you encounter any error, you're welcome to report it in issues.

> [!WARNING] > It is up to user to provide sandboxed Lua interpreter without potentially harmful functionality. > Using stock interpreter with untouched os, io, ffi libraries may lead to malicious code > execution by an AI model! The potentially harmful functionality from major Lua implementations > like LuaJIT and all stock Lua interpreters is hidden behind CMake option called LMCP_UNSAFE > and it's disabled by default. Even tho it is disabled, user should never assume that it's > safe to let AI execute whatever code it wants to execute, especially with custom interpreters > I didn't take into consideration. Every script AI writes should be approved by the user first.

Usage

Add the application to your mcp.json. Here's the file example:

{
  "mcpServers": {
    "LightMCP": {
      "command": "D:/LightMCP/build/LightMCP.exe",
      "args": [
        "--vm-timeout", "2",
        "--print-max", "5000",
        "--return-max", "5000"
      ]
    }
  }
}

Use ./LightMCP.exe --help to get the list of available arguments and their description.

License

This project is licensed under MIT license. Used third party libraries and their corresponding licenses are placed inside the third_party directory.

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: igor725
• Source: igor725/LightMCP
• License: MIT

Install and usage instructions live in the source repository linked above.