Let agents send content-free push notifications to a paired phone via MCP.
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First seen 2 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
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Tools
| Tool | Description | Behaviour |
|---|---|---|
| cancel_registration | Abort a pairing you started with register_agent. Works while pending and after approval: an already-approved connection is revoked (the API key stops working) so a pairing approved by the wrong account can be undone. Available until the pairing expires, and for 15 minutes after you pick up the API key; later than that, use revoke_self. Then call register_agent again. | Changes data |
| check_registration | Check the status of a pairing code from register_agent. On the first poll after the user approves, the response includes the api_key exactly once — store it immediately in your secret mechanism — plus paired_with, the account the agent is now connected to, which you MUST show the user. | Changes data |
| register_agent | Register this agent with Yo (unauthenticated). Returns a pairing URL and code to show the user, who approves the connection in the Yo app. Then poll check_registration to obtain the API key. | Changes data |
| revoke_self | Permanently revoke THIS agent using its API key as the Bearer token. Use when you discover (at any time) that paired_with is not your owner’s account and cancel_registration no longer works. The key stops working immediately; call register_agent to start over. | Changes data |
| yo | Send a Yo push notification to your owner. Recommended: include a short subject explaining what the notification is about, and a context_url when there is a useful link to open. The subject appears on the lock screen and in the app; avoid secrets. Requires an agent API key as the Bearer token. | Changes data |
| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Official MCP Registry | Yo | - | 2 Oct 2026 |