[bot] docs(learning-hub): document notification hook, PermissionRequest hook, Critic agent, and built-in skills

[github-actions]

What's New

Updates the Learning Hub documentation to reflect Copilot CLI releases v1.0.16 through v1.0.18 (April 2–4, 2026).

New Features Found

Feature	Version	Description
notification hook event	v1.0.18	New asynchronous hook that fires on shell completion, permission prompts, elicitation dialogs, and agent completion
PermissionRequest hook	v1.0.16	New hook that intercepts Copilot's tool permission prompts for programmatic approve/deny
preToolUse permissionDecision output	v1.0.18	Outputting {"permissionDecision":"allow"} from a preToolUse hook suppresses the approval UI prompt
Critic agent	v1.0.18	Experimental built-in agent for Claude models that auto-reviews plans and implementations using a complementary model
Built-in skills	v1.0.17	CLI now ships with built-in skills out of the box (e.g., Copilot cloud agent environment customization guide)

Sections Updated

automating-with-hooks.md

• Updated "Key characteristics" to note most hooks execute synchronously but notification fires asynchronously
• Added notification (async) and PermissionRequest rows to the Hook Events table
• Expanded the preToolUse key insight note to document permissionDecision: "allow" output behavior
• Added "Auto-Approving with PermissionRequest" practical example with JSON config
• Added "Non-Blocking Notifications with the notification Hook" practical example section documenting async behavior and trigger scenarios

building-custom-agents.md

• Added FAQ entry explaining the Critic agent experimental feature (auto-reviews plans for Claude models)

creating-effective-skills.md

• Added introductory note about CLI-bundled built-in skills available out of the box

Source Announcements

• v1.0.16: https://github.com/github/copilot-cli/releases/tag/v1.0.16
• v1.0.17: https://github.com/github/copilot-cli/releases/tag/v1.0.17
• v1.0.18: https://github.com/github/copilot-cli/releases/tag/v1.0.18

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