[bot] docs: add built-in skills documentation

[DanWahlin]

What changed

One beginner-relevant update from the Copilot CLI changelog was found and added to the course.

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Built-in skills shipped with the CLI (v1.0.17 — April 3, 2026)

"Built-in skills are now included with the CLI, starting with a guide for customizing Copilot cloud agent's environment"

Updated: 05-skills/README.md

The "New to Skills? Start Here!" section now explains that /skills list will also show built-in skills that ship with the CLI (not just project/personal skills). A beginner tip box calls out the customizing-copilot-cloud-agents-environment skill as an example, so learners know they already have skills available before creating any.

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Already covered (no changes needed)

• /share html — already documented in Chapter 02 session management section
• /mcp auth — already documented in Chapter 06 additional MCP commands table

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Source announcements

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

Generated by Course Updater · ◷

[DanWahlin]

@copilot Since the Critic agent is experimental let's not include that in the course yet. Remove that change.

[Copilot]

@copilot Since the Critic agent is experimental let's not include that in the course yet. Remove that change.

Done — removed the Critic agent row from the built-in agents table in commit a8b9cb6.

[Copilot]

Pull request overview

Updates the Skills chapter documentation to reflect that Copilot CLI now ships with built-in skills, helping beginners discover available skills before creating their own.

Changes:

• Clarifies that /skills list includes built-in CLI-shipped skills in addition to project/personal skills.
• Adds a beginner tip highlighting the built-in customizing-copilot-cloud-agents-environment skill as an example.

Show a summary per file

File	Description
05-skills/README.md	Updates the “New to Skills?” section to mention built-in skills and provide an example tip.

Copilot's findings

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• Files reviewed: 1/1 changed files
• Comments generated: 2

[Copilot]

Wording here implies multiple built-in skills ship with the CLI ("built-in skills", "skills pre-installed"), but the CLI release note says this starts with a single built-in guide/skill. Consider rephrasing to avoid overstating availability (e.g., "at least one built-in skill" / "a built-in skill").

Suggested change

	This shows all skills Copilot can find, including any **built-in skills** that ship with the CLI itself, plus skills from your project and personal folders.
	> 💡 **Built-in skills**: The Copilot CLI comes with skills pre-installed out of the box. For example, the `customizing-copilot-cloud-agents-environment` skill provides a guide for customizing the Copilot cloud agent's environment. You don't need to create or install anything to use these. Run `/skills list` to see what's available.
	This shows all skills Copilot can find, including any built-in skill that ships with the CLI itself, plus skills from your project and personal folders.
	> 💡 **Built-in skill**: The Copilot CLI comes with a built-in skill available out of the box. For example, the `customizing-copilot-cloud-agents-environment` skill provides a guide for customizing the Copilot cloud agent's environment. You don't need to create or install anything to use it. Run `/skills list` to see what's available.

[Copilot]

Product naming is inconsistent within this doc: earlier it says "the GitHub Copilot cloud agent" but this new tip says "the Copilot cloud agent". Consider using the same name here for consistency and clarity.

Suggested change

	> 💡 **Built-in skills**: The Copilot CLI comes with skills pre-installed out of the box. For example, the `customizing-copilot-cloud-agents-environment` skill provides a guide for customizing the Copilot cloud agent's environment. You don't need to create or install anything to use these. Run `/skills list` to see what's available.
	> 💡 **Built-in skills**: The Copilot CLI comes with skills pre-installed out of the box. For example, the `customizing-copilot-cloud-agents-environment` skill provides a guide for customizing the GitHub Copilot cloud agent's environment. You don't need to create or install anything to use these. Run `/skills list` to see what's available.