What does it take for an AI agent to complete real world tasks?

Been thinking about this a lot lately. Most agent demos look impressive until you actually try to deploy them. They can reason, plan, use tools but the moment they need to interact with the world the way a human would, they hit a wall. ​ The gap isn't the model. It's not the prompts. It's that agents have no persistent identity in the real world. No way to reach out, no way to be reached, no way to transact. ​ Here's what I've found actually matters: ​ **A real phone number** Not text-to-speech piped into a call. An actual number the agent owns — that it can dial from, that people can call back, that carries the same weight as a human calling you. Most people skip this because it's annoying to set up. *AgentLine provisions numbers specifically for agents and handles the infrastructure* so you're not dealing with webhooks and Twilio configs from scratch. ​ **A real email address** Agents need more than the ability to trigger a send. They need to receive replies, follow threads, and respond in context — the same back-and-forth a human assistant would handle. *Agent Mail gives agents a proper inbox*, not just an outbound pipe. ​ **A real payment method** This one gets overlooked the most. If your agent can research, book, and confirm — but can't actually pay — you're still babysitting every task that costs money. *Agent Card gives agents a payment method they can use autonomously*, with the controls you'd expect. ​ Once you have those three in place, something shifts. The agent stops being a thing that helps you do tasks and starts being a thing that does tasks. The loop actually