GitHub Copilot app for Beginners: Run several agents at once

The GitHub Copilot app supports running multiple AI agent sessions in parallel, with each session isolated on its own Git worktree so they don't interfere with each other and keep their own context. Users can track progress in the sessions view and switch between sessions at any time without re-explaining background. The article uses the tailspin-toys repository to demonstrate running three tasks simultaneously: adding a feature, an accessibility review, and running tests.