Articles: Copilot CLI

GitHub Copilot custom agents: .agent.md files and tools
Set up GitHub Copilot custom agents with .agent.md files, scoped tools, precedence and CLI invocation.

GitHub Copilot CLI: install, sign in and tool approvals
GitHub Copilot CLI setup from GitHub's docs: install, sign in, plan mode, -p prompts and safe tool approvals.

Copilot hooks: config files, events and examples
Copilot hooks run commands at agent events like preToolUse, from .github/hooks/*.json in the CLI and cloud agent.
