gws-mcp-server

MCP server that exposes Google Workspace CLI (gws) operations as Model Context Protocol tools.

Why?

The gws CLI had a built-in MCP server that was removed in v0.8.0 because it exposed 200-400 tools — causing context window bloat in MCP clients. This server takes a curated approach: you choose which Google services to expose, and only a focused set of high-value operations are registered as tools.

Prerequisites

• Node.js 18+
• gws CLI installed and authenticated (npm install -g @googleworkspace/cli && gws auth login)

Quick start

# Install
npm install -g gws-mcp-server

# Or run from source
git clone https://github.com/conorbronsdon/gws-mcp-server.git
cd gws-mcp-server
npm install && npm run build

Configuration

Claude Code (.mcp.json)

{
  "mcpServers": {
    "google-workspace": {
      "command": "npx",
      "args": [
        "gws-mcp-server",
        "--services", "drive,sheets,calendar,docs,gmail"
      ]
    }
  }
}

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "google-workspace": {
      "command": "npx",
      "args": [
        "gws-mcp-server",
        "--services", "drive,sheets,calendar"
      ]
    }
  }
}

Options

Available services & tools

drive (7 tools)

• drive_files_list — Search and list files
• drive_files_get — Get file metadata
• drive_files_create — Create files (with optional upload)
• drive_files_copy — Copy files (useful for format conversion)
• drive_files_update — Update file metadata/content
• drive_files_delete — Delete files
• drive_permissions_create — Share files

sheets (4 tools)

• sheets_get — Get spreadsheet metadata
• sheets_values_get — Read cell values
• sheets_values_update — Write cell values
• sheets_values_append — Append rows

calendar (5 tools)

• calendar_events_list — List events
• calendar_events_get — Get event details
• calendar_events_insert — Create events
• calendar_events_update — Update events
• calendar_events_delete — Delete events

docs (3 tools)

• docs_get — Get document content
• docs_create — Create documents
• docs_batchUpdate — Apply document updates

gmail (4 tools)

• gmail_messages_list — Search messages
• gmail_messages_get — Read a message
• gmail_threads_list — Search threads
• gmail_threads_get — Read a full thread

Total: 23 tools (vs 200-400 in the old implementation)

Adding new tools

Edit src/services.ts to add tool definitions. Each tool maps directly to a gws CLI command:

{
  name: "drive_files_list",           // MCP tool name
  description: "List files in Drive", // Shown to AI
  command: ["drive", "files", "list"],// gws CLI args
  params: [                           // Maps to --params JSON
    { name: "q", description: "Search query", type: "string", required: false },
  ],
  bodyParams: [                       // Maps to --json body
    { name: "name", description: "File name", type: "string", required: true },
  ],
}

Architecture

MCP Client (Claude) ←→ stdio ←→ gws-mcp-server ←→ gws CLI ←→ Google APIs

The server is a thin wrapper: it translates MCP tool calls into gws CLI invocations, passes --params and --json as appropriate, and returns the JSON output.

License

MIT