cablehead/mcp-server-nu
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The MCP Server Nu is a Model Context Protocol server designed to execute Nushell scripts, providing outputs such as stdout, stderr, and exit codes.
MCP Server Nu
An MCP (Model Context Protocol) server that allows AI assistants to execute Nushell scripts with full system access.
How it works
This server spawns nu -c "<script>" processes to execute commands. The nu
process runs with the same permissions as the server process, giving it access
to:
- File system (read/write/delete)
- Network (make requests, start servers)
- Environment variables
- System commands via nu's shell integration
- Any custom nu configurations you provide
Security implications: The AI can execute arbitrary code on your system. Only use with trusted AI assistants and in environments where this level of access is acceptable.
Tool: exec
Executes Nushell scripts and returns stdout, stderr, exit code.
Parameters:
script(required): Nushell script to executetimeout_seconds(optional): Timeout in seconds (default: 30)
Example:
{
"script": "ls | where size > 1MB | get name",
"timeout_seconds": 10
}
Configuration
The server accepts optional CLI arguments to use custom nu config files:
mcp-server-nu --nu-config /path/to/config.nu --nu-env-config /path/to/env.nu
Options:
--nu-config <path>: Custom config.nu file (sets up commands, aliases, etc.)--nu-env-config <path>: Custom env.nu file (sets up environment variables)
When provided, these configs are loaded for every script execution via
nu --config <path> --env-config <path> -c "<script>".
Install & Test
cargo install --locked mcp-server-nu
npx @modelcontextprotocol/inspector mcp-server-nu
With custom config:
npx @modelcontextprotocol/inspector -- mcp-server-nu --nu-config /path/to/config.nu