HappyCapy is a browser-based platform for running AI coding agents (built on Claude Code with configurable "skills") in an isolated sandbox, aimed at users who want to delegate tasks to an agent without setting up local tooling.
It provides a visual interface so users can watch what the agent is doing and step in when needed, rather than working through a hidden command-line process. Tasks can also run asynchronously, with agents delivering completed work by email and allowing follow-up by replying to that email.