Hoplite gives cloud coding agents a live browser preview of the app they're building

Y Combinator S26 startup Hoplite launches cloud coding agents in isolated machines cloned from a user's repo. Each sandbox boots the application on a live URL the agent itself can interact with via browser — a feedback channel local coding agents lack when working on frontend or full-stack code. The agent loops through edit, test, and retry before requesting human sign-off for a pull request.