A multi-session walkthrough of GitHub Copilot customization features in VS Code, covering custom instructions, agent skills, custom agents, hooks, and prompt files. Each session demonstrates a specific feature: custom instructions enforce coding standards like SOLID principles and WCAG accessibility automatically; agent skills automate tasks like updating README files when features are added; custom agents adopt specialized personas (e.g., security reviewer, arcade app builder); hooks run shell commands at lifecycle points such as auto-formatting with Prettier after file edits; and prompt files provide reusable, repeatable prompts for tasks like code simplification or quizzing. A final session ties everything together by building a GitHub repo analyzer app that exercises all five customization types simultaneously, showing how they reduce repetitive prompting and enforce consistency across a project.
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