What is an AI chief of staff?

A job borrowed from the office

In a big organization, the chief of staff is the person who makes the boss's day happen. They know what's on the calendar and why. They chase what was promised. They decide what reaches the boss's desk and what gets dealt with before it does. Most of us have never had one, and never expected to.

An AI chief of staff is that same job, done by an AI assistant, for one ordinary person. One assistant that knows your calendar, your inbox and your list, acts on the routine things, and brings you the decisions. Not a different app for every chore. We shorten it to CoS. For a lot of people it's a Grok Bot. It could as easily be ChatGPT or Claude, set up to look after your day.

What it handles

The routine. The things that need doing and don't need you. A useful test is whether you'd hand the task to a capable new hire in their first week without a long explanation.

• The calendar. Knowing when you're free, spotting the clash on Thursday, putting confirmed bookings in.
• The inbox. Reading the thread behind a request and drafting the reply for you to send.
• The chasing. The quote that was due Monday. The form the school still hasn't sent.
• The errands. Turning a recipe into a grocery cart, finding the flights, booking the table.
• The morning round-up. What happened since yesterday, what's booked, what's waiting on you.

What it should hand back to you

Here's where a good one differs from an eager one. A chief of staff, human or otherwise, prepares decisions. It doesn't make the ones that are yours.

Money is yours. So is anything you can't undo, anything that commits you past a simple booking, and anything where the other person ought to hear it from you. A good assistant builds the grocery cart and you check out. It finds the flight and you book it. It gets the contractor's price in writing and you say yes or no.

We've built our own line around that idea. On a call it never gives out a card number and never agrees to a charge. If a restaurant wants a deposit, that comes back marked as needing you.

Why most assistants stop at the screen

AI assistants are good with anything that has a login. Your calendar, your email, your documents. If the task lives on a screen, they can usually reach it.

But a surprising amount of daily life has a phone number and not much else. The restaurant that only takes bookings by phone. The roofer with no website worth the name. The school office. The pharmacy. The airline, when things have gone wrong enough that the app gives up and tells you to call.

Even where there is an app, the door is often shut. The big restaurant booking apps don't let outside assistants book through them. So your very capable assistant plans the whole evening, and then hands you a phone number and wishes you luck. That's the wall, and nearly everyone who leans on an assistant hits it sooner or later.

What a phone number adds

Give the assistant its own number and three things become possible.

You can call it. You're driving, you remember the car needs a service, you ring your assistant and say so. It can call for you: the table, the appointment, the vendor who owes you a callback. And it can answer when you can't. Forward the calls you miss, and the person ringing gets a conversation in place of a beep, while you get the details in writing.

That's what we make. A CosVoice line is a real number in your area code, with its own email address, attached to your assistant. Every call ends with a written summary, so the assistant (and you) know what was agreed. The how it works page shows the steps, and there are plenty of examples under what people use it for.

Do you need a particular assistant?

No. The idea matters more than the brand. Our line connects to Grok, ChatGPT, Claude and Cursor, and the integrations page lists the apps it can work with, from calendars to grocery carts. It also works with no assistant attached, which is a reasonable way to start if you're not sure you want one running your calendar yet.

What does matter is how much you let it see. An assistant with no access to your calendar can't tell the dentist when you're free. One that can't read the email thread will draft a vague reply. Give access in steps, as it earns it. That's how you'd treat a person in the job, too.

Start with one chore

People who try to hand over their whole life on day one tend to give up by day four. It's too much to brief and too much to check.

Pick the one recurring thing you drop most often. For some people it's booking things. For others it's returning calls, or the Sunday-night scramble to work out what the week holds. Hand over that, and only that, for two weeks. Read what comes back. Correct it when it's wrong, the way you'd correct a new hire.

When you notice you've stopped checking its work on that one chore, add a second.

Common questions

More on the basics

• What is an AI phone number, and how do you get one?
• How to give your AI agent its own phone number
• AI that makes phone calls for you: what it can and can't do
• How an AI phone call actually works, from dial to summary