Conciseness

The body is lean and assumes competence: no explanation of what ffmpeg or PSNR are, commands given bare, tolerances stated as numbers ("PSNR ≥45dB", "RMS error ≤0.08", "correlation ≥0.99"). It is not a 5 because of real redundancy: the "Human version" preface restates the agent content, the Quality Checks section repeats verification rules already stated in Workflow steps 2–5, and the audio-tail rule appears in both Inputs and Failure Modes.

Actionability

Copy-paste commands for preflight, the main run, the demo, and the pack wrapper, plus a fully enumerated manifest schema and config fields (source.sha256, hook_end_sec, words, captions, output). It falls short of anchor 5 because the config format is never shown completely — the referenced [config.example.json](config.example.json) does not exist in the bundle, and the demo's `python3 -m unittest discover -s tests -v` references a `tests/` directory that is also absent, so the "free demonstration" cannot run as written from a fresh package folder.

Workflow Clarity

A five-step numbered workflow with explicit validation checkpoints: watch/confirm intake, preflight before any encoding, manifest booleans plus PSNR/RMS/correlation verification, watch the actual output, and a fix-and-re-run feedback loop ("Fix only the opening and re-run to a new path") backed by a Failure Modes table mapping each problem to a specific action. This matches anchor 5's clear sequence with explicit validation and error-recovery loops; the destructive/batch cap does not apply since verification gates are present.

Progressive Disclosure

The one real reference file (references/hook-replacement.md) is clearly signaled from Purpose and exists, and sections are well-organized. But disclosure is structurally undermined by unresolved paths: config.example.json and the tests/ directory referenced in the body are missing from the bundle, and the "Related" section uses opaque wiki-style markers ([[references::preflight-concat]], [[used-by::...]]) that resolve to nothing a reader can open. This sits between anchor 4 (mostly clear references, minor gaps) and anchor 3 — closer to 3 because two inline references and the entire Related section do not navigate anywhere.

Specificity

"Replace an existing video's opening with a supplied clip or free kinetic text hook while retaining and verifying every original body frame, audio, captions and ending" lists multiple concrete actions (replace opening, supply clip, kinetic text hook, retain body/audio/captions/ending, verify) with comprehensive coverage of the skill's scope. It exceeds anchor 4 ("several specific actions; minor gaps") because nothing meaningful in the capability is left unstated; the compressed jargon ("free kinetic text hook") is a phrasing choice, not a coverage gap.

Completeness

The "what" is explicit (replace opening with clip or kinetic text while retaining/verifying body, audio, captions, ending) and the "when" is an explicit trigger clause: "Use for surgical hook tests rather than regenerating the complete ad" — which also carries a contrast that sharpens when it applies. This clearly matches anchor 5 (both what and when with concrete trigger phrases) rather than anchor 4, where the "when" would be only implicit or less explicit.

Trigger Term Quality

Natural terms present: "video's opening", "supplied clip", "hook", "captions", "ending", "surgical hook tests" — good keyword coverage matching what a user would say ("replace the opening/hook of this video"). It falls short of anchor 5 because common synonyms and file extensions are missing ("intro", "first few seconds", ".mp4", "ad creative"), so a few natural trigger phrasings would not match.

Distinctiveness Conflict Risk

A clear niche — surgical video opening/hook replacement with body preservation verification — with distinct triggers (hook replacement, opening swap, retained body/captions) that would rarely collide with general editing or generation skills. The "rather than regenerating the complete ad" clause actively distinguishes it from whole-video regeneration skills, matching anchor 5.