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GitHub Copilot CLI Adds Fleet Mode to Run Multiple Agents in Parallel

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GitHub added a /fleet command to GitHub Copilot CLI that enables parallel multi-agent orchestration (the coordination layer managing multiple agents working together). Instead of processing tasks one by one, a central orchestrator decomposes a high-level prompt into discrete work items and dispatches background sub-agents to execute them simultaneously.

This update addresses the latency bottleneck of single-agent systems that edit files sequentially. By moving to a parallel model, developers can implement features spanning the API, UI, and documentation layers at once. It introduces a more complex agentic engineering (designing and managing reliable AI agent systems) workflow where the AI acts as a project lead.

You can trigger this mode by running /fleet followed by a multi-part objective. To optimize performance, you should define specialized agents in .github/agents/ and explicitly partition file boundaries in your prompts to avoid overwriting data, as sub-agents share a filesystem without file locking.

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Why work on one file when you can work on five at the same time? 😏 Run /fleet in Copilot CLI to dispatch multiple sub-agents in parallel to tackle your codebase faster than ever. ⚡️ Write the best prompts for fleet mode. 👇 https://t.co/Ev7Tey0bvy

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