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Yo

by alfongj-com · remote · no sign-in to list tools · v1.0.1 · published by GitHub user alfongj-com

Let agents send content-free push notifications to a paired phone via MCP.

Deletes · 2Final · 1Changes · 2
CompareRegistry entry

5 tools: 2 can delete or cancel things, 1 do something that can't be undone and 2 change things.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http yo https://getyo.dev/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

5 tools

Deletes or cancels 2Claude Code: deny
  • cancel_registrationAbort a pairing you started with register_agent.No findings

    Why it is in this group

    • The name "cancel_registration" says "cancel": a word for removing or ending something.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • readOnlyHint: false
    • openWorldHint: false
  • revoke_selfPermanently revoke THIS agent using its API key as the Bearer token.No findings

    Why it is in this group

    • The name "revoke_self" says "revoke": a word for removing or ending something.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • readOnlyHint: false
    • openWorldHint: false
Can't be undone 1Claude Code: ask
  • yoSend a Yo push notification to your owner.No findings

    Why it is in this group

    • The description's first verb is "send": a word for sending, and what is sent cannot be taken back.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • readOnlyHint: false
    • openWorldHint: false
Changes things 2Claude Code: ask
  • check_registrationCheck the status of a pairing code from register_agent.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • readOnlyHint: false
    • openWorldHint: false
  • register_agentRegister this agent with Yo (unauthenticated).No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • readOnlyHint: false
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http yo https://getyo.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__yo__register_agent",
      "mcp__yo__check_registration",
      "mcp__yo__yo"
    ],
    "deny": [
      "mcp__yo__cancel_registration",
      "mcp__yo__revoke_self"
    ]
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as yo. Review it before you use it.