GitHub Copilot Fleet Parallel Agents

Summary

GitHub Copilot CLI added `/fleet` on April 1, 2026 — a slash command enabling parallel multi-agent execution across a codebase. A behind-the-scenes orchestrator breaks objectives into independent work items and dispatches multiple agents simultaneously to work on different files. This complements the Copilot CLI GA (February 2026) which shipped Plan mode, Autopilot mode, and parallel specialized sub-agents (Explore, Task, Code). As of April 20, new sign-ups for Copilot Pro, Copilot Pro+, and stu