When MCP server

@whenlabs/when

Six tools. One install.

A single installable toolkit that brings six WhenLabs developer tools into your Claude Code workflow. After install, the tools are exposed over a single MCP server and Claude calls them automatically when relevant.

Install

npx @whenlabs/when install

One-time setup. The installer:

1. Registers a single MCP server (whenlabs) in your Claude Code configuration
2. Injects a CLAUDE.md block so Claude knows when to use each tool
3. Cleans up any legacy velocity-mcp registration (velocity is now bundled)

The six tools

MCP tools

Eight endpoints across the six tools:

All eight are served by the single whenlabs MCP server (stdio, Node 20+). Fix/init/auxiliary commands remain available via each tool's CLI (npx @whenlabs/ --help).

CLI

when init       # Onboard a project — detect stack, bootstrap configs, run all checks
when doctor     # Run all six tools and show a unified health report
when install    # Register MCP server in Claude Code
when uninstall  # Remove MCP server

For per-tool operations, use the tool directly:

npx @whenlabs/stale scan
npx @whenlabs/envalid validate
npx @whenlabs/berth check
npx @whenlabs/aware sync
npx @whenlabs/vow scan

Manual MCP configuration

If you're not using the install command, add this to your Claude Code MCP config:

{
  "mcpServers": {
    "whenlabs": {
      "command": "npx",
      "args": ["@whenlabs/when", "when-mcp"]
    }
  }
}

License

MIT — see LICENSE

Built by Siddharth at WhenLabs