When MCP Server

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. It runs locally over stdio via the published package.

People who work with developer tools, devex and npm package and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-09-14 · ★ 3 · #302 OF 945 MAINTAINED OTHER · VERIFIED 2026-09-18

MIT · TypeScript servers · how we verify → /methodology

01 · Install When

Claude Code

claude mcp add whenlabs-org-when -- npx -y @whenlabs/when

Claude Desktop / Cursor / VS Code - add to config

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

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license MIT - declared in the repository

npm package @whenlabs/when - the @whenlabs scope differs from the repo owner (whenlabs-org); confirm it's the project's official package

registry namespace io.github.WhenLabs-org is GitHub-verified and matches the repo owner

03 · What When can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

@whenlabs/when@0.12.3 · 2026-04-21

Fix factual inaccuracies in vow_scan and berth_check tool descriptions. vow previously claimed to read pnpm-lock.yaml, yarn.lock, and go.sum - it does not. berth previously singled out vite.config.\ - it detects…

@whenlabs/velocity-mcp@0.1.5 · 2026-04-21

Expand MCP tool descriptions to cover purpose, when-to-use, side effects, and return shape for all 7 tools (aware_sync, berth_check, envalid_validate, stale_scan, vow_scan, velocity_start_task, velocity_end_task).…

@whenlabs/envalid@1.0.0 · 2026-04-21

Trim surface to a focused .env schema validator. · framework adapters (express/fastify/nextjs/nestjs/vite), secret providers (Vault/AWS SM/Doppler/1Password), the plugin loader, and the watch, onboard, hook, migrate…

04 · Who maintains When

when is maintained by whenlabs-org. It's the only MCP server we track from this author; the repo dates to Apr 2026.

05 · Facts

repository: github.com/whenlabs-org/when
category: other - ranked #302 of 945 actively-maintained other servers as of 2026-09-18.
registry: io.github.WhenLabs-org/when (active, first published 2026-04-16 · 4 versions)
packages: npm:@whenlabs/when

06 · When FAQ

What is When?

Is When still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-14. We re-verify nightly.

How do I install When?

Run `npx -y @whenlabs/when`. You can also paste the ready-made client config above.

Does When run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to When

Alternatives to When

Maintained other servers if When isn't the fit.

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