[bot] Update Learning Hub for Copilot CLI v1.0.15–v1.0.18 features

[github-actions]

What's New

Reviewing the GitHub Copilot CLI releases from the past 7 days (v1.0.15–v1.0.18, released March 31–April 4, 2026), the following features were missing from the Learning Hub:

New features found

Version	Feature
v1.0.18	Critic agent — reviews plans and complex implementations with a complementary model (experimental, Claude models only)
v1.0.18	notification hook event — fires asynchronously on shell completion, permission prompts, elicitation dialogs, and agent completion
v1.0.18	permissionDecision: 'allow' — preToolUse hooks can return this to suppress the tool approval prompt
v1.0.16	PermissionRequest hook — programmatically approve or deny tool permission requests before the prompt is shown
v1.0.17	Built-in skills — CLI now ships with built-in skills (first: customizing Copilot cloud agent environment)

Features already documented (no changes needed): /share html, camelCase settings, postToolUseFailure, /mcp auth, device code flow, MCP server RPCs, subagentStart/subagentStop, mcp.config.* RPCs.

Sections Updated

automating-with-hooks.md

• Added notification and PermissionRequest rows to the Hook Events table
• Expanded the preToolUse key insight note to explain the new permissionDecision: 'allow' return value
• Added three new practical example sections:
  • Async Notifications with the notification hook
  • Programmatic Permission Decisions with PermissionRequest
  • Suppressing the Approval Prompt from preToolUse

using-copilot-coding-agent.md

• Added "The Critic Agent (Experimental)" section under Best Practices, covering how to enable it, what it does, and when it's most useful

creating-effective-skills.md

• Added "Built-in Skills" subsection explaining that v1.0.17 bundled skills with the CLI, how they behave, and how to override them with custom skills

Source Announcements

• v1.0.18 release — Critic agent, notification hook, permissionDecision: 'allow'
• v1.0.17 release — built-in skills
• v1.0.16 release — PermissionRequest hook
• v1.0.15 release — postToolUseFailure (already documented), /share html (already documented)

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