Conciseness

The body is a lean command cookbook with no padding or explanations of concepts Claude already knows, but it is not fully lean: the scale/pad filter appears in full both in the 'Resize for platform' example and again per-row in the Platform Presets table, where 'YouTube' and 'Twitter/X' rows repeat an identical filter. That minor duplication keeps it just below anchor 5 ('every token earns its place') and at anchor 4 ('minor instances ... that could be trimmed').

Actionability

Every section gives fully executable, copy-paste-ready commands (e.g., 'ffmpeg -y -ss 00:00:30 -to 00:01:45 -i video.mp4 -c copy trimmed.mp4') with real filenames and concrete filter expressions, covering all the common video-editing cases the description promises. This matches anchor 5 ('Fully executable; copy-paste ready code or commands; specific examples cover the common cases') with no gaps that would justify 4.

Workflow Clarity

Each operation is an unambiguous single command, which alone would qualify for the simple-skill exception, but the skill involves batch operations ('Concatenate clips' across multiple inputs) and destructive overwrite behavior ('Always use `-y` to overwrite output without prompting') with no validation checkpoint — no codec-compatibility check before stream-copy concat and no ffprobe verification of the output. The rubric's explicit cap ('a destructive or batch skill without validation cannot score above 3') takes precedence over the simple-skill exception, and this is above anchor 2 because the commands themselves are precisely defined.

Progressive Disclosure

The body keeps quick commands inline and pushes detailed recipes and flag explanations to a real, one-level-deep 'references/operations.md' (verified to exist), which is good structure. However, the pointer is a single line buried at the end of the 'Tips' section ('For detailed recipes and flag explanations, see `references/operations.md`') rather than a clearly signaled reference section, and the inline presets table duplicates reference-level detail — minor organization gaps that fit anchor 4, not the fully split, easy-navigation profile of anchor 5.

Specificity

The description lists multiple specific concrete actions — 'Trim, concat, resize, speed, overlay, extract audio, compress, and convert' — that comprehensively cover every operation in the skill body, matching anchor 5. It is not anchor 4 because there are no coverage gaps relative to what the skill actually does.

Completeness

It explicitly answers both questions: the 'what' ('Edit videos locally using ffmpeg. Trim, concat, resize, speed, overlay, extract audio, compress, and convert.') and the 'when' via a numbered 'Use when:' clause with seven concrete trigger phrases. This matches anchor 5 ('Clearly and explicitly answers both what AND when with concrete trigger phrases'); anchor 4 would require the 'when' to be less explicit, which it is not.

Trigger Term Quality

Good natural-term coverage: 'Trimming or cutting video segments', 'Concatenating multiple clips', 'extract audio', 'Compressing video', 'Getting video info' are phrases users would actually say. It falls short of anchor 5, which requires synonyms and file extensions, because there are no extensions (.mp4, .mov) and common variants like 'crop', 'watermark', or 'slow motion' are missing; it is clearly above anchor 3's 'missing common variations'.

Distinctiveness Conflict Risk

'Edit videos locally using ffmpeg' claims a clear niche with video-specific triggers (trim, concat, resize for social platforms, extract/replace audio) that are unlikely to fire for unrelated skills. Overlap risk is minimal — at most a hypothetical general media skill — matching anchor 5's 'Clear niche with distinct triggers; minimal conflict risk'.