Cobalt is an AI coding agent with its own persistent cloud computer. Connect your GitHub repository, describe a coding task in plain language, and Cobalt can edit the code, install dependencies, run tests, start services, and show you the application working through a live browser preview. Each task runs in an isolated development environment and continues working even after you close the tab. You can run features, bug fixes, prototypes, and technical experiments in parallel, then review the completed changes as commits and pull requests—without configuring local environments or juggling extra checkouts and worktrees.