Hammerspoon MCP Server

by vukvukovichio.github.vukvukovich/hammerspoon-mcpv0.4.0

Control macOS through Hammerspoon: windows, apps, and API search. Injection-safe by design.

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Maintained57d ago

Install Hammerspoon MCP server

claude mcp add hammerspoon-vukvukovich -- npx -y @vukvukovich/hammerspoon-mcp

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

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

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

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

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

Add to .vscode/mcp.json in your workspace.

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

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
HS_MCP_TOOLS	—	—	Which tools to expose. "safe" (default) exposes inspection, window management, and system tools only. "all" additionally exposes hs_eval, hs_applescript, and hs_ui_press, which run arbitrary Lua and AppleScript and press UI elements - anything the user can do.
HS_MCP_TRANSPORT	—	—	How Lua reaches Hammerspoon. "socket" (default) keeps one persistent Unix domain socket, self-installed on first call, with automatic fallback to spawning; "spawn" runs one hs process per call.
HS_MCP_HS_PATH	—	—	Explicit path to the Hammerspoon hs command line tool. Only needed when Hammerspoon is installed somewhere unusual.
HS_MCP_DOCS_PATH	—	—	Explicit path to Hammerspoon's bundled docs.json, used by hs_api_search.
HS_MCP_LOG_LEVEL	—	—	Log verbosity on stderr: debug, info (default), warn, or error.

Freshness

Maintained — last maintenance signal 57d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-08-14 · 57d ago · GitHub
Latest release
2026-08-14 · 57d ago · GitHub · v0.4.0
Package published
no data · npm/PyPI
Registry entry updated
2026-08-14 · 57d ago · official registry · v0.4.0

FAQ

›How do I install the Hammerspoon MCP server in Claude Code?

Run: claude mcp add hammerspoon-vukvukovich -- npx -y @vukvukovich/hammerspoon-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Hammerspoon require an API key?

No required environment variables are declared in its published metadata.

›Can I use Hammerspoon as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Hammerspoon in the official MCP registry?

Yes, as io.github.vukvukovich/hammerspoon-mcp.