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Version: 0.57.0

CC-OS-006: Invalid Output Style Frontmatter Syntax

Summary​

  • Rule ID: CC-OS-006
  • Severity: HIGH
  • Category: claude-output-styles
  • Normative Level: MUST
  • 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: false
  • E2E tests: false

Examples​

The following examples demonstrate what triggers this rule and how to fix it.

Invalid​

---
name: Concise
description: Short replies

Valid​

---
name: Concise
description: Short replies
---
Be brief.