Backa gives AI agent writes an undo path

Field notes

The described write path pairs a pre-apply plan with a receipt after the change; the receipt is intended to tell an agent what happened and how to reverse it. Backa says its journal is append-only and hash-chained, and that an irreversible action such as sending email can be held briefly in an outbox. Its sample undo keeps a later human edit rather than restoring over it.