Hammerspoon MCP Server

What the code does

We read the source, 3 d ago · rules 995398eba69f

A value the model can set ends up inside a file or shell call. That is not a flaw by itself — for a terminal server it is the job — but it is where things go wrong when it is not.

      return bridge.eval(`

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

      return bridge.eval(`

      const result = execSync(`${this.hsPath} -c '${escaped}'`, {

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

claude mcp add hammerspoon -- npx -y hammerspoon-mcp

{
  "mcpServers": {
    "hammerspoon": {
      "command": "npx",
      "args": [
        "-y",
        "hammerspoon-mcp"
      ]
    }
  }
}

[mcp_servers.hammerspoon]
command = "npx"
args = ["-y", "hammerspoon-mcp"]

{
  "mcpServers": {
    "hammerspoon": {
      "command": "npx",
      "args": [
        "-y",
        "hammerspoon-mcp"
      ]
    }
  }
}

{
  "servers": {
    "hammerspoon": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "hammerspoon-mcp"
      ]
    }
  }
}