POST https://cloud.watahub.dev/mcp accepts the same tenant API key as /v1, in Authorization: Bearer or X-API-Key. Each tool proxies to a /v1 route; it is not a complete copy of the HTTP API.
Tools
Without
phoneNumberId, create_webhook creates a project webhook. send_text sends a text message (kind: "text"). send_broadcast creates a draft and immediately queues it; recipients is an array of 1 to 500 digit-only numbers, and the template must already be cached and APPROVED.
Keep the key out of public clients. See authentication, webhooks and broadcasts.