Conciseness

The body is command-driven and assumes Claude's competence — it never explains what ffmpeg or screen recording is, and every section is either an executable snippet or a brief directive, matching the lean/efficient anchor.

Actionability

Provides fully executable, copy-paste-ready commands ("node "$SCREENCAST_JS" deps", start/stop/status, pick-window/pick-region) with a complete flag list and JSON output contract, satisfying the executable-code anchor.

Workflow Clarity

A clear four-step sequence (deps → choose target → confirm/start → stop) with an explicit deps validation checkpoint in Step 1 and an Edge Cases section covering error recovery (dead process, already-recording, unstopped sessions).

Progressive Disclosure

SKILL.md is an overview with a single one-level-deep, clearly signaled reference ("See [the reference guide](references/REFERENCE.md)") that exists in the bundle; macOS picker details, tips, and standalone install are appropriately split out rather than inlined.

Specificity

Lists multiple concrete actions — "Record your screen to video", "pick a display, window, or screen region", "start/stop recording on demand", "Produces MP4" — matching the anchor for listing several specific concrete actions.

Completeness

Clearly states what it does (screen-to-MP4 capture with display/window/region selection via ffmpeg, cross-platform) and gives an explicit "Triggers on" clause for when to use it, satisfying both what and when.

Trigger Term Quality

The explicit "Triggers on: screencast, record screen, screen recording, capture screen, record window, record region, start recording, screen capture video" gives broad coverage of natural terms a user would say, not jargon.

Distinctiveness Conflict Risk

Screen recording is a clear niche with distinct triggers, and "Pairs with demo-narrate for voice-over" further distinguishes it from adjacent skills, making conflict unlikely.