sendmux-cli

Use when a user wants to run the Sendmux **CLI** (the `sendmux` terminal binary) — installing it, OAuth login/logout, connection checks, agent inbox registration and owner invites, managing API-key or OAuth profiles, key-scope preflight errors (e.g. root vs mailbox vs agent key), `--json` output, or invoking Management, Mailbox, and Sending operation comman…

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