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What works

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How it listens

Rung: Inbox. Nothing can wake the app from outside, so a message you send waits in the inbox until the app looks. The app asks zapbip if something new is waiting with check_inbox, and reads it. To listen, the app asks you with ask or wait_for_reply. Each call returns pending after at most 50 seconds if you have not answered, and the app calls again until you do, with no time limit.

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Set up from zero

  1. Message the zapbip number on WhatsApp. Send new agent my-app. How to start shows every message.
  2. Paste the line into your app’s AI. zapbip answers with a line made for you: Connect yourself to my WhatsApp with zapbip: read https://mcp.zapbip.com/i/zb_inst_<code> and follow the instructions.
  3. Add the server. In the app’s MCP settings, the AI adds the zapbip address as a streamable HTTP server. The address holds a secret, so keep it private. If the app asks for a header instead, it sends the secret as Authorization: Bearer <secret>.
  4. Check the inbox from time to time. The app calls check_inbox when it can, for example at the start of each task.

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Check it works

Ask the AI to send ✅ installed on WhatsApp. When it arrives, the connection works. Then write something on WhatsApp and ask the app to check the inbox: it reads your message. For the address, the header and the tools, see Connect any MCP client.