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The `media-use` SKILL.md `description:` was an unquoted YAML scalar containing a mid-value `: ` (`...the full cascade: project cache...`). YAML 1.2 reads that as a nested mapping and the parse fails with "Nested mappings are not allowed in compact mappings". `skills add` aborts the entire install when any one skill fails to parse, so this single file blocked installing all 19 skills for everyone following the README's `npx skills add heygen-com/hyperframes`. - Replace the offending `: ` with ` — ` (keeps the plain-scalar style used by the other 18 skills; the description already uses `—` as a separator). - Add a frontmatter guard to scripts/lint-skills.ts that flags unquoted top-level scalars containing `: ` — the exact ambiguity — so this can't regress. No new dependency. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>