Meta built every part of Muse except the till
Meta's personal agent runs its own model, its own secure VM and its own guard agent, then checks out with Link by Stripe and promises never to feed Meta's ad system.
Meta launched Muse on 8 September, a personal AI agent that runs on its own cloud virtual machine, reads your email, books your travel, negotiates on your behalf and pays with your card. Free for most usage, then $20 a month for the Power plan and $100 for Maximum. And it asks for a payment card before you start.
Meta built almost all of it. The model is Muse Spark, the isolated computer is Muse Secure VM, the guard is a separate Sentinel agent that has to approve anything leaving the machine. One piece is somebody else's. When Muse buys something it checks out with Link by Stripe, and Meta's own announcement says Muse is "the first AI agent covered by Link's purchase protections": free coverage for damaged or lost items, price drops, no-fee returns, a return guarantee on eligible purchases.
Read that as a liability question rather than a feature list. When an agent buys the wrong concert tickets, who eats it?
A payments company, apparently.

Meta has won Tech Twitter today with its AI assistant, Muse.
It was smart to give early access to tastemakers like @ivanhzhao and @patrickc. Well executed, relatively leak-free launch for @alexandr_wang.
With Instinct and so many others chasing this category, expect it to continue to be chaotic, and — for early adopter types — very exciting!
But for the average consumer or locked-in builder, they probably can wait for the dust to settle a bit, while everyone reaches a baseline of feature parity.
In the meantime, as Silicon Valley races to anoint a winner (and invest or gain clout from preferred access to it), it will be very noisy on this site…
The subscription is the stranger part. Meta has spent twenty years giving consumer software away and charging advertisers, and here it has shipped a consumer product with two price tiers and a card on file at signup. The reason is three lines further down the same announcement: "Muse doesn't share a person's conversations or the data in their VM with Meta's ad systems." People can also opt out of their interactions being used to train Meta's models.
So Meta has voluntarily walled off the richest first-party signal it has ever had access to — what you buy, what you cancel, what you negotiate, who you invite to dinner — from the machine that produces essentially all of its revenue. Then it charged for the walled-off product. Those two facts go together.
You cannot promise an agent will not feed the ad system and also fund it with ads.
Our read is that the wall is the product, and that walls in this industry get moved. We would expect the ads carve-out to narrow before the price does: Meta amends the Muse language within eighteen months to let derived signals (not conversations) reach ad targeting, probably framed as an opt-in (the word will be "personalisation", and it will arrive in a settings screen rather than a launch post). If instead the pricing changes and the privacy language holds, we had this backwards, and we would say so.
The fair counter is that Meta does not need Muse data at all. It already has enough targeting signal to sell a couple of hundred billion dollars of advertising, and the marginal value of knowing which tennis lesson you booked is probably small next to the cost of breaking a promise made in a launch post. TechCrunch spent half its piece on Meta's FTC history for exactly this reason, and the concern is reasonable. Our answer is that agents do not produce more of the same signal. They produce purchase intent with a confirmed outcome attached, which is the one thing an ad system cannot buy anywhere else.
Worse off: everyone in this category with a price. Instinct and Town raised at $2.5bn and about $1bn respectively on products a lot of people love and nobody gets for nothing. Now the free tier belongs to a company with WhatsApp distribution.
That is a hard thing to price against.
Muse rolls out in the US on iOS, Android, the web and inside WhatsApp, with AI glasses to come. Watch the card requirement, not the launch reviews. A free product that needs your card on file already knows what it is.