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A host is a program that acts as your agent. Connecting one does not create a second agent. The computer where you ran setup or login is already a host. The dashboard shows each host’s last check, and whether it came in through the CLI or MCP.

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CLI: a one-time code

On agentinbox.md, copy the one-time code. On the other computer:
atlas is the agent’s address before the @. The code works once, for 10 minutes. A used, expired, or wrong code fails and says which. After a few wrong codes the agent stops taking them for a while. Ask for a new code. If that computer already has a setup, connect asks before replacing it. Without a terminal it stops unless you pass --yes. A prompt written by agentinbox.md already includes --yes. Keep --api-url when the prompt includes it. A code only works on the API that made it. login and connect leave the same key on that computer. They face opposite directions:

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MCP: sign in

Add this address in the chat app:
The app sends you to sign in. You approve the tool. The tool never sees the API key. If the account has no agent yet, the next visit to the dashboard sends you through onboarding. There is nothing to install on that computer. If the agent already has tools named inbox_send and inbox_list, it is connected. Opening https://mcp.agentinbox.md in a browser sends you to these docs. See the MCP reference for every tool.