aether logout
aether logoutRevokes this machine’s credential on the server, then deletes ~/.aether/credentials.json. The command takes no flags.
If the server cannot be reached, the local credential is deleted anyway and the command says so. The machine then stays authorized until you revoke it from the dashboard under Account → CLI & Devices, or until the session expires.
When the stored credential came from aether login --accessKey, there is no device to revoke: the command clears the key locally and leaves it valid everywhere else, because that key belongs to whoever issued it.
To end sessions on other machines, use aether session or the dashboard.