CC-OS-003: Output Style Unknown Frontmatter Key
Summary
- Rule ID:
CC-OS-003 - Severity:
MEDIUM - Category:
claude-output-styles - Normative Level:
SHOULD - Auto-Fix:
No - Verified On:
2026-04-22
Applicability
- Tool:
claude-code - 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
---
name: Concise
description: Short replies
alwaysApply: true
---
Be brief.
Valid
---
name: Concise
description: Short replies
keep-coding-instructions: false
---
Be brief.