Generate Custom Instructions From Codebase

When you're migrating a codebase between framework versions or doing major refactors, this generates GitHub Copilot instructions by analyzing the diff between two git references. It creates a `.github/copilot-migration-instructions.md` file with transformation rules, API mappings, and before/after code examples so Copilot can automatically apply the same patterns to future changes. Works well for Angular upgrades, React class-to-hooks migrations, or architecture refactoring where you want Copilot to learn your specific transformation decisions. The real value is turning your one-time migration work into reusable automation rules.

skills.sh installs: 8.9K
GitHub stars: 41K
last updated: Aug 21, 2026

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Install

$ npx -y skills add github/awesome-copilot --skill generate-custom-instructions-from-codebase --agent claude-code

Installs into .claude/skills of the current project.

Files

Migration and Code Evolution Instructions Generator

Configuration Variables

${MIGRATION_TYPE="Framework Version|Architecture Refactoring|Technology Migration|Dependencies Update|Pattern Changes"}
<!-- Type of migration or evolution -->

${SOURCE_REFERENCE="branch|commit|tag"}
<!-- Source reference point (before state) -->

${TARGET_REFERENCE="branch|commit|tag"}  
<!-- Target reference point (after state) -->

${ANALYSIS_SCOPE="Entire project|Specific folder|Modified files only"}
<!-- Scope of analysis -->

${CHANGE_FOCUS="Breaking Changes|New Conventions|Obsolete Patterns|API Changes|Configuration"}
<!-- Main aspect of changes -->

${AUTOMATION_LEVEL="Conservative|Balanced|Aggressive"}
<!-- Level of automation for Copilot suggestions -->

${GENERATE_EXAMPLES="true|false"}
<!-- Include transformation examples -->

${VALIDATION_REQUIRED="true|false"}
<!-- Require validation before application -->