When

Overview

When is a Model Context Protocol server that brings the WhenLabs developer toolkit into your AI assistant. It provides 6 tools and 7 MCP endpoints in one install, letting Claude, Cursor, VS Code, and other MCP clients call these capabilities directly instead of switching between apps.

When runs locally on your machine via the npm package @whenlabs/when, speaking MCP over stdio. No authentication is required — install it and it works immediately. The latest release is v0.12.3, licensed under MIT, with source code available at WhenLabs-org/when on GitHub.

When appears in the Development category on mcp.site and works with MCP clients including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, and Zed. If you maintain When for WhenLabs, you can claim this listing to verify ownership and keep the information up to date.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "when": {
      "command": "npx",
      "args": [
        "-y",
        "@whenlabs/when"
      ]
    }
  }
}