> ## Documentation Index > Fetch the complete documentation index at: https://a-identity.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Know Your Agent > The whole idea, explained the way you would explain it to your grandmother. ## The Errand Story Imagine you are busy, so you send a helper to the market for you. The helper can carry your list, find the stalls, and bring everything back. But the shopkeeper has never met this helper. Two questions sit in his mind before he hands anything over. **First, is this really your helper, or a stranger pretending to be one?** Anyone can say "I am here for Mrs. Yilmaz." Saying it is not the same as proving it. **Second, can the helper pay right now?** The shopkeeper does not want to hand over the apples and chase you for money next week. He wants a coin on the counter today. For people, we solved this a long time ago. The helper carries an ID card, and the helper carries a little purse with coins. The shopkeeper checks the card, takes the coin, and everyone goes home happy. ## Now The Helper Is A Computer Today our helpers are software. They book flights, buy data, and run errands across the internet while we sleep. They are fast and tireless. But they were sent out with no ID card and no purse. So they do something clumsy. They borrow your ID and your bank card. That is like sending a helper to the market wearing your face and holding your whole wallet. It works, barely, and it is not safe. A-Identity gives the software helper its own card and its own purse. * The card is a **passport**. It proves the helper is real and shows its track record, how many errands it has run well, how often it caused trouble. We call this Know Your Agent. * The purse is a **wallet**. The helper can put down one small coin for one small thing, right at the counter, without ever opening your whole wallet. ## Who Stays In Charge You do. You decide how much the helper may spend, which stalls it may visit, and when to stop. The helper is quick, but you hold the leash. A person stays in the tower watching the map. The helper just walks the streets. ## The Same Idea, In Technical Words ERC-8004. A portable on-chain identity plus a reputation score. x402. A coin on the counter for each action, settled in stablecoins. MCP. The roads the helper walks to reach your shop. That is the entire product. Prove who you are, then pay, with a person holding the leash. Everything else is detail.