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no-duplicate-prompt-names

Disallow duplicate effective prompt names across workspace prompt files.

Rule catalog ID: R038

Targeted pattern scope​

  • .github/prompts/**/*.prompt.md

What this rule reports​

  • prompt files whose effective name collides with another prompt file in .github/prompts
  • collisions involving explicit name frontmatter and filename-derived default names

Why this rule exists​

Prompt files share a slash-command namespace. Duplicate effective names make it ambiguous which prompt a caller intends to invoke and can create hard-to-diagnose behavior differences across tools.

❌ Incorrect​

.github/prompts/review.prompt.md
.github/prompts/other.prompt.md   # with frontmatter: name: review

✅ Correct​

.github/prompts/review.prompt.md
.github/prompts/other.prompt.md   # with frontmatter: name: review-security

Further reading​