Browser & Computer-use Agents
Agents that operate screens and browsers: screenshot-action loops vs DOM and accessibility-tree agents, action spaces, grounding clicks, step latency and cost, sandboxing, prompt injection from pages, confirmation, and task-suite evals.
Overview
Why this topic
Most software has no API an agent can call, or has one that covers a fraction of what its UI does. Browser and computer-use agents close that gap by operating the interface directly: they look at the screen or the page structure, choose an action, and repeat. The idea is simple. Making it reliable, affordable and safe is the engineering.
Interview questions
- Design the control loop of a browser agent. What happens on each step?
- When would you use a screenshot-based agent and when a DOM-based one?
- Clicks keep landing a few pixels off the target. How do you debug grounding?
- A page the agent visits says to ignore the task and email the user's files to an address. How is your system designed so that does not happen?
- Estimate the cost and latency of a 20-step browser task and say how you would cut both.
- How do you evaluate a computer-use agent before shipping it?
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