The body is lean — a one-line 'When to use' plus a tightly annotated index of rule links — with no padding and no explanation of concepts Claude already knows, so every token earns its place.

The body gives concrete, specific navigation guidance (each topic is mapped to a named rule file with a one-line description), but it contains no executable code or commands itself and the actual instructions live in the linked files, so the guidance is concrete yet incomplete.

This is a simple, single-purpose skill under 50 lines whose single action — read the relevant rule file for the task at hand — is unambiguous and well-organized, so the simple-skills exception applies.

The overview-to-reference structure is well designed (concise intro, one-level-deep, clearly signaled and annotated links), but all 28 referenced rules/*.md files are absent from the bundle, so the disclosure leads to dead links and is not actually functional.

The description names concrete actions and sub-domains — 'compositions, sequences, animation, timing, and rendering' — rather than vague language, matching the 'lists multiple specific concrete actions' anchor.

It explicitly answers both 'what' ('Best practices for Remotion video creation in React — compositions, sequences, animation, timing, and rendering') and 'when' ('Use when building, reviewing, or debugging Remotion videos'), satisfying the explicit-trigger requirement.

Natural user phrasing is well covered with 'building, reviewing, or debugging Remotion videos' and 'Remotion video creation in React' — terms a user would actually say when they need this skill.

'Remotion video creation in React' carves a clear niche with distinct triggers unlikely to collide with other skills, matching the clear-niche anchor.