Conciseness

The body is mostly lean — a phased workflow, targeted question lists, and a functional template — but the "3b1b Style Principles" section spends lines on general pedagogy Claude already knows ("Vary the pace - Mix quick sequences with slower explanations", "Acknowledge difficulty - 'This might seem confusing at first...'"). Matches anchor 4 ('Efficient; minor instances of over-explanation that could be trimmed'), not 5, since that section could be condensed or pushed to a reference file.

Actionability

For an instruction-only skill, guidance is concrete: an exact output file (scenes.md) with a full copy-paste-ready markdown template, specific clarifying-question categories, and named deliverables per phase. It falls short of anchor 5 only because the body gives no worked excerpt or calibration guidance (e.g., scene count/duration vs. target video length) — examples are delegated to references/scene-examples.md without any inline sample.

Workflow Clarity

The three phases (Understand → Clarify → Create scenes.md) are clearly sequenced, with a user feedback loop ("not all at once - adapt based on responses"). Not a destructive/batch operation, so no validation cap applies, but there is no explicit checkpoint verifying the scenes.md against the style principles before finishing — matching anchor 4 ('Clear sequence with most checkpoints present; minor validation gaps') rather than 5.

Progressive Disclosure

The three references/ files exist and are clearly signaled with one-line descriptions, but the body links to templates/scenes-template.md which does not exist in the bundle (no templates/ directory), a broken navigation path. Additionally the full scenes.md template (~55 lines) is inlined while a separate template file is supposedly provided, matching anchor 3's 'content that should be separate is inline' — the defects go beyond anchor 4's 'minor organization gaps'.

Specificity

Multiple concrete actions are named — "Transforms vague video ideas into detailed scene-by-scene plans (scenes.md)", "Conducts research", "asks clarifying questions about audience/scope/focus", "outputs comprehensive scene specifications ready for implementation with ManimCE or ManimGL" — with a named output artifact and target tools. This matches the anchor 'Lists multiple specific concrete actions; comprehensive coverage'; score 4's 'minor gaps in coverage' would understate it since the planning workflow is fully enumerated.

Completeness

Explicitly answers 'what' ("Transforms vague video ideas into detailed scene-by-scene plans (scenes.md)...") and 'when' via a numbered five-item "Trigger when:" list with concrete trigger phrases. This is a direct match for the anchor 'Clearly and explicitly answers both what AND when with concrete trigger phrases'.

Trigger Term Quality

Natural phrases users would actually say are covered with synonyms: "educational/explainer video", "3b1b style" / "explain like 3Blue1Brown", "plan a Manim video or animation sequence", "compose" or "plan" a math/science visualization. Matches the anchor 'comprehensive coverage of natural terms including synonyms'; it is not score 4 because no common phrasing for requesting this skill is conspicuously missing.

Distinctiveness Conflict Risk

Clear niche (planning 3b1b-style math/science videos) with an explicit boundary against sibling skills: "This skill plans the video; use manimce-best-practices or manimgl-best-practices for implementation" and "Use this BEFORE writing any Manim code". Matches 'Clear niche with distinct triggers; minimal conflict risk'.