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Mastering copilot-instructions.md for Project-Wide AI Context
Anil Goyal (Medium) April 23, 2026
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Detailed guide on creating and optimizing the .github/copilot-instructions.md file for consistent project-wide Copilot behavior.
Rule Content
Mastering copilot-instructions.md:
1. **File Location**: `.github/copilot-instructions.md` (exact path required)
2. **Content Structure**:
- Project overview and tech stack
- Coding conventions and style guide
- Architecture patterns to follow
- Testing requirements
- Security practices
- Performance considerations
3. **Effective Patterns**:
- Use headers to organize sections
- Be prescriptive, not descriptive
- Include "DO" and "DON'T" lists
- Reference specific libraries and versions
- Mention file naming conventions
4. **Anti-Patterns to Avoid**:
- Too vague ("write good code")
- Too long (keep under 2000 words)
- Contradictory instructions
- Instructions that conflict with language defaults
5. **Maintenance**: Update as project evolves, review quarterlyComments
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