Conciseness

The body is dense and operational with no explanations of concepts Claude already knows, but there is some repetition — the "Read fresh, then write" bullet restates the read-before-every-change rule, and rhetorical phrasing like "A stale id is a failed edit; a stale assumption about what is on the page is a wrong edit" could be tightened. This fits the 'efficient; minor instances that could be trimmed' anchor rather than the lean score-5 anchor.

Actionability

Guidance is fully executable: exact tool invocations (`read_stage path:/scenes/<order|id>` with `detail:"source"`, `generate_tts`, `edit_deck retitle/insert/delete/reorder`) and a complete intent→tool→operation matrix with concrete JSON Pointer paths (`/content/canvas/elements/N/left`, `/actions/N/text`, `/content/questions/...`). For an instruction-only skill this covers the common cases copy-paste ready, matching the top anchor.

Workflow Clarity

A clear sequence runs from entry (`list_scenes`) through read-before-each-edit, smallest-operation selection, a bounded preview loop ("at most two preview rounds per page"), TTS regeneration after wording changes, to a closing consistency checklist. Explicit feedback loops exist for the destructive edit case ("A rejected patch changed nothing… Re-read and resubmit; never force"; wrong page type → re-read), so the missing-validation cap does not apply.

Progressive Disclosure

The bundle has no reference/script/asset files, and the body appropriately stays an overview: field-level detail and design law are deferred to named sibling skills with clear signals ("that is `slide-dsl`", "load `slide-craft`"), one level deep. Sections are well-organized and easy to navigate, fitting the clear-overview anchor.

Specificity

The description lists multiple concrete actions — "fix a page, tune a layout, repair a quiz, reword narration, reorder the deck, or raise the quality of the whole course" — giving comprehensive coverage of the skill's capabilities. It clearly exceeds the score-4 anchor, which allows minor gaps in coverage.

Completeness

Both questions are answered explicitly: the 'what' ("Professional editing of a course that already exists" with a concrete action list) and the 'when' ("Use when the user wants to revise, improve, restructure or polish pages the course already has"), plus an explicit exclusion ("Not for building a new course from scratch"). This matches the anchor-5 pattern of concrete trigger phrases for both what and when.

Trigger Term Quality

It covers the natural synonym space for editing requests ("revise, improve, restructure or polish", "repair a quiz", "reword narration", "reorder the deck") — phrases a user would naturally say. No common variation of an editing request is missing, so it fits the comprehensive-coverage anchor rather than the 'a few natural terms missing' anchor.

Distinctiveness Conflict Risk

The scope is narrowed to an already-persisted course ("a course that already exists", "pages the course already has") and the boundary "Not for building a new course from scratch" explicitly separates it from a course-creation skill. It carves out a clear niche with distinct triggers and minimal conflict risk.