Conciseness

The ~24-line body is lean with no padding: it never explains what Excalidraw, undo/redo, or history capture are, and every section (Scope, Method, Threshold, Reporting) carries unique operational content. This matches the anchor 'Lean and efficient; assumes Claude's competence; every token earns its place.'

Actionability

The guidance is concrete and repo-specific — 'element ids, fractional ordering, deleted-element handling, and selection state', 'CaptureUpdateAction or the repository's equivalent update path', and explicit report/do-not-report criteria — but it stops short of naming specific files/functions or example findings. Mostly actionable guidance with minor gaps, matching anchor 4 rather than 5.

Workflow Clarity

The Method section lays out a clear follow-through sequence ('Start at the changed editor operation... Follow the update through the element map, app state, history capture, and any tests'), and the Threshold section provides an explicit decision checkpoint. It is not 5 because the sequence is one flowing sentence rather than explicit steps with verification checkpoints, and not 3 because the sequence and decision points are clearly present.

Progressive Disclosure

The skill is under 50 lines, single-purpose, and needs no external references (none exist in the bundle and the body references none, which is consistent). Its four well-organized sections satisfy the simple-skill exception: well-organized sections alone merit 5.

Specificity

It names the domain concretely ('Excalidraw editor changes', 'scene graph, history, and undo/redo integrity') but offers a single action verb — 'Review ... for ... integrity' — with the sub-areas as objects of that one action. That matches anchor 3 ('names domain and 1-2 concrete actions, but not comprehensive') better than 4, which expects several distinct actions.

Completeness

The 'what' is clear (review Excalidraw changes for scene/history/undo-redo integrity) and an explicit 'Use as one lens in a code review run' clause supplies the 'when', so it exceeds anchor 3's weakly-implied 'when'. It is not 5 because the when-clause lacks concrete trigger phrases a user would say.

Trigger Term Quality

'Excalidraw', 'editor changes', 'undo/redo', 'history', and 'code review' are natural terms a user reviewing this codebase would actually say, giving good keyword coverage. It falls short of anchor 5 because natural variations like 'elements', 'canvas', or 'state management' are absent.

Distinctiveness Conflict Risk

'Excalidraw editor changes' carves out a clear niche with distinct triggers — no other skill category would plausibly claim this description — and conflict risk with generic code-review skills is minimal given the domain specificity.