COP-004: Unknown Frontmatter Keys - GitHub Copilot
Summary
- Rule ID:
COP-004 - Severity:
MEDIUM - Category:
GitHub Copilot - Normative Level:
SHOULD - Auto-Fix:
Yes (safe) - Verified On:
2026-02-04
Applicability
- Tool:
github-copilot - Version Range:
unspecified - Spec Revision:
unspecified
Evidence Sources
Test Coverage Metadata
- Unit tests:
true - Fixture tests:
true - E2E tests:
false
Examples
The following examples demonstrate what triggers this rule and how to fix it.
Invalid
---
applyTo: "**/*.ts"
unknownKey: some-value
---
# TypeScript Instructions
Use strict mode.
Valid
---
applyTo: "**/*.ts"
---
# TypeScript Instructions
Use strict mode.