-Custom instruction files and prompt files provide a structured way to guide GitHub Copilot's behavior at the repository, path, and organization levels. By creating a `.github/copilot-instructions.md` file for project-wide standards, optional `.instructions.md` files for path-specific rules, and `.prompt.md` files for reusable prompt templates, you can align AI-generated suggestions with your team's coding conventions. Writing effective instructions—with reasoning, examples, and focused scope—maximizes the value of these customization features. Together, these tools reduce manual corrections, improve code consistency, and embed your team's knowledge directly into the development workflow.
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