github-copilot-repo-instructions

You can configure path-specific GitHub Copilot instructions by creating `.github/instructions/<name>.instructions.md` files with mandatory `applyTo` frontmatter, allowing different codebase sections to receive tailored guidance.

GitHub Copilot code review ignores custom instructions when the `.github/copilot-instructions.md` file is not committed on the base branch, or if path-specific files lack the required `applyTo` frontmatter for proper discovery.

The best way to standardize Copilot guidance is combining a repo-wide `.github/copilot-instructions.md` file with path-specific `.instructions.md` files, ensuring consistent conventions for Chat and code review while adhering to size limits.

Yes, you can apply GitHub Copilot instructions to specific file paths by creating instruction files in `.github/instructions/` and defining glob patterns in the mandatory `applyTo` frontmatter for targeted rule delivery.

Yes, GitHub Copilot supports path-specific rules for PR review and the coding agent by merging repo-wide instructions with path-scoped `.instructions.md` files based on their `applyTo` frontmatter precedence.