The WhatsApp ticks comparison is a good frame. Sent, delivered and read are three different claims, and nobody confuses them. An agent saying "done" often collapses all of those into one word.
On client work we force the opposite. Before a build starts, "done" is written as acceptance criteria someone can check without trusting the agent's summary: the refund leaves one ledger entry, the deploy rolls back within a set time, the report matches a known fixture. Those are closer to blue ticks than to a confident closing message.
Which of the six states do you see agents claim most often when the real work is still sitting in "sent"?