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Mcp Server Commands

Mcp Server Commands

Created by g0t4•4 months ago
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Model Context Protocol server to run commands

Automation & Scripting
ModelContextProtocolservercommands

Tools

Tools are for LLMs to request, i.e. Claude Desktop app. Claude Sonnet 3.5 intelligently uses both tools, I was pleasantly surprised.

  • run_command - run a command, i.e. hostname or ls -al or echo "hello world" etc
    • Returns STDOUT and STDERR as text
  • run_script - run a script! (i.e. fish, bash, zsh, python)
    • Let your LLM run the code it writes!
    • script is passed over STDIN
    • run_script == run_command + script over STDIN
    • Claude has been pretty creative with this, i.e. using cat as the interpreter to create new files!

[!WARNING] Be careful what you ask this server to run! In Claude Desktop app, use Approve Once (not Allow for This Chat) so you can review each command, use Deny if you don’t trust the command. Permissions are dictated by the user that runs the server. DO NOT run with sudo.

Video walkthrough

YouTube Thumbnail

Prompts

Prompts are for users to include in chat history, i.e. via Zed’s slash commands (in its AI Chat panel)

  • run_command - generate a prompt message with the command output

Development

Install dependencies:

npm install

Build the server:

npm run build

For development with auto-rebuild:

npm run watch

Installation

To use with Claude Desktop, add the server config:

On MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json On Windows: %APPDATA%/Claude/claude_desktop_config.json

Use the published npm package

Published to npm as mcp-server-commands using this workflow

{
  "mcpServers": {
    "mcp-server-commands": {
      "command": "npx",
      "args": ["mcp-server-commands"]
    }
  }
}

Use a local build (repo checkout)

{
  "mcpServers": {
    "mcp-server-commands": {
      // works b/c of shebang in index.js
      "command": "/path/to/mcp-server-commands/build/index.js"
    }
  }
}

Logging

Claude Desktop app writes logs to ~/Library/Logs/Claude/mcp-server-mcp-server-commands.log

By default, only important messages are logged (i.e. errors). If you want to see more messages, add --verbose to the args when configuring the server.

By the way, logs are written to STDERR because that is what Claude Desktop routes to the log files. In the future, I expect well formatted log messages to be written over the STDIO transport to the MCP client (note: not Claude Desktop app).

Debugging

Since MCP servers communicate over stdio, debugging can be challenging. We recommend using the MCP Inspector, which is available as a package script:

npm run inspector

The Inspector will provide a URL to access debugging tools in your browser.

Prerequisites

  • •Familiarity with the server domain
  • •Basic understanding of related technologies
  • •Knowledge of Automation & Scripting

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Details

Created

March 07, 2025

Last Updated

March 07, 2025

Category

Automation & Scripting

Author

g0t4

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