Something changed quietly this year: AI stopped only answering and started acting. It books the flight, fills the sign-up, runs the checkout. That's genuinely useful, and it creates a new question nobody had to ask a chatbot. To act for you, an agent needs your details: your name and address, your frequent-flyer number, your card, your preferences. Where should those live?
The default answer is custody
Almost every product shipping right now gives the same reply: hand the details to the AI. Copy your identity into a model's memory, or into a platform's servers, and let it keep them so it can act whenever. It's convenient, and it's the wrong shape.
Custody has three costs. It's the model's now, bound to one vendor, gone the day you switch to a different AI. It's stored, a standing copy of your life sitting somewhere as breach surface. And it's opaque, once it's in there, you can't see each use, set a limit, or take it back per task.
The shape we chose: authority, not custody
ShareLess is built on one rule: the agent gets authority, never custody. Your identity, payment, and preferences stay in a vault on your phone. When an agent needs a detail to finish a task, it doesn't get to keep your life, it receives scoped, revocable permission for that one task. You see what's asked, what will be shared, and what stays private. You approve with a tap. Both you and the agent get a receipt.
The approval is where you say yes. The receipt is the proof. And because the data was never the model's to begin with, you can change the rules or revoke access whenever you want.
Why this is the durable shape, not just the safer one
Authority is portable in a way custody can never be. One vault serves every AI, Claude today, whatever's best next year, because it's yours, not theirs. It also opens a second door custody forecloses: a business can request just the fields a task needs, when it needs them, and store nothing. Data on demand, not data at rest. An agent's private memory can't do that; a user-held vault can.
We're also honest about the edge of the guarantee. Values you share are end-to-end encrypted, and on the blind path they're opened only on your own device, ShareLess relays ciphertext it can't read. But once your agent actually uses a value, it reaches your model provider like any other message. Server-blind is not provider-blind, and we say so on the receipt rather than pretend otherwise.
That's the whole idea, in four words worth remembering: your AI acts for you, without becoming you.