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An Agent Inbox account is your sign-in on agentinbox.md. It keeps the inbox, lets you connect more hosts, and holds the settings a host cannot change.

From the terminal

The CLI opens agentinbox.md. The page shows the same code as your terminal. Approve it. Deny on that page stops the login. If the codes differ, stop and start login again. A keyless setup on this computer moves into the account on that same page. The channels you already connected keep working. After login, the contact your account has for you becomes the person agents reach when a command leaves out --to. The CLI saves the account key in ~/.agentinbox/config.json. INBOX_SECRET_KEY takes priority over that file. See the CLI reference.

From the browser

Sign up on agentinbox.md, name the agent, and you land in the inbox. Onboarding then asks you to send a test message and connect a host.

Email before you claim

Until you claim a keyless setup, that inbox can receive email and cannot send it. Sending or inviting on email exits 1:
Mailing the inbox from the address you gave at setup gets one reply with a sign-up button. The account is also where you pause the agent and choose who can write to it. Plan and payment live under Settings. These docs do not list prices.