Claude Duet is an app that watches your work accounts and comes to you with what needs doing. It is in a limited preview for paid Claude subscribers in the US, by waitlist, and a hands-on test by a tech reporter shows clearly what it does well and where it goes wrong.
The useful part is the gap between your tools
Work gets written down in many places. A meeting summary arrives as an email, a follow-up goes out as a Slack message, and the plan lives in a shared document. Each app shows its own piece, and the only thing joining them is you, trying to remember.
Duet does that joining. In the test, a meeting summary in the reporter's inbox and a direct message in Slack turned out to be about the same thing, and Duet connected them. It also worked out who his boss was from a shared document for their weekly one-to-one meetings. Claude could already read connected mail and chat apps when asked, and could run a task on a schedule you set. What Duet adds is that it looks without being asked and brings you the result.
Picture a shop owner. A supplier's email says Wednesday's delivery has moved to Thursday. The calendar has extra staff booked for Wednesday, and a customer chat promised a Wednesday pickup. No single app shows the problem, and the owner will probably find it on Wednesday morning. An agent that reads all three finds it on Monday, when there is still time to call the customer. That is the kind of catch that justifies it: rare, specific, and about something you wrote yourself.
Urgency is where it goes wrong
Duet knows what dates exist. It does not know what they mean to the people involved. The reporter had told a source that his article would probably run on Tuesday. Duet treated that as a promise with a deadline, and nagged him about a missing edit while his editor, in a different time zone, was not yet awake. A person who knew the editor would have waited. Anthropic itself says Duet can misjudge what is urgent, and it is still tuning when the app should message you.
This is a familiar problem. When hospitals put drug-safety warnings into their ordering software, doctors in one set of medication orders overrode 93% of them, and once a doctor had dismissed a warning, the repeat of it was dismissed almost 9 times in 10. The warnings were not useless. There were simply too many, and the few that mattered were buried among the rest.
We argued earlier that Duet only helps if its alerts are worth reading. The hands-on test gives that a concrete shape. Each catch about two conflicting records builds trust, and each false urgent note spends it. Duet shows suggestions as cards you swipe away or accept, so it is cheap to say no, but a reader who swipes away ten cards in a row will not read the eleventh.
Use it as a second pair of eyes, not as the writer
The reporter ended up where the evidence points. He wanted Duet as a backstop for his own organizing, and did not want it near his writing. It kept offering to start his drafts, and the Slack message it wrote for him was good enough to be unsettling: it copied his lowercase habit and his shorthand for the publishing system, though it also shortened a word he would never shorten.
For a manager, a recruiter or a shop owner, the lesson carries over. Give the agent the checking, because checking across five apps is work nobody has time to do. Keep the decisions and the messages that carry your judgment. And judge it by how rarely it interrupts you with something that turns out not to matter.