Conciseness

The body is lean and assumes competence: no space is spent explaining what HTML, SRI, or Playwright are — every section (Output, Required Sections, Section Selection, Gotchas) delivers non-obvious, project-specific information. It matches the anchor 'Lean and efficient; assumes Claude's intelligence; every token earns its place'; anchor 4 would require some over-explanation that could be trimmed, and none is evident.

Actionability

The output specification is fully concrete ("{MAIN_REPO_ROOT}/diagrams/opik-{TICKET_NUMBER}-diagram.html" with git rev-parse resolution, copy-as-image button, max-4-sections rule), but the core executable content is delegated to "Follow the style guide in style-guide.md and use the HTML template in template.md" — and neither file exists in the bundle. The template, the SRI hash, and the toBlob copy script are all unavailable, so the skill cannot actually be executed from what ships. This lands at anchor 3 ('Some concrete guidance but incomplete; missing key details') — anchor 4 requires mostly executable guidance, which the dangling references break.

Workflow Clarity

The flow (pick sections by change type -> follow style guide/template -> emit file at fixed path) is sequenced and the Section Selection mapping is a useful decision guide, but the critical step 'How to Generate' points to the missing files, and there is no validation checkpoint (e.g. open the HTML, screenshot it, verify the diagram is not truncated). This matches anchor 3 ('Steps listed but validation gaps; sequence present but checkpoints missing or implicit') rather than 4, whose sequence must be executable end-to-end with at most minor gaps.

Progressive Disclosure

The in-file structure is good — a dedicated 'Reference Files' section with one-line descriptions of each reference, links one level deep, no nested references. However, per the actual bundle listing, style-guide.md and template.md do not exist in references/ (the directory is absent), so navigation to the detailed material fails. A well-signaled pointer to a nonexistent file is a broken structure, not the anchor-5 'Clear overview with well-signaled one-level-deep references'; anchor 4's 'minor organization gaps' understates a fully missing bundle, so it sits at 3.

Specificity

"Generate self-contained HTML architecture diagrams" names the domain and exactly one concrete action (generate diagrams); there is no enumeration of what the diagrams cover (data flows, before/after comparisons, file-by-layer grids) which the body shows are core capabilities. This matches the anchor 'Names domain and 1-2 concrete actions, but not comprehensive' — anchor 4 requires several listed actions, which the description does not provide.

Completeness

The 'what' is explicit ("Generate self-contained HTML architecture diagrams") and the 'when' is an explicit trigger clause with concrete phrases ("Use when creating visual diagrams for PRs, task plans, or architectural explanations"). This mirrors the anchor-5 example structure almost exactly; anchor 4 would require the 'when' to be weaker or less specific than it is.

Trigger Term Quality

Trigger phrases "visual diagrams", "PRs", "task plans", and "architectural explanations" are natural things a user would say when they need this skill. Common variations like "diagram this change", "visualize the architecture", or "before/after comparison" are missing, so it falls at anchor 4 ('Good keyword coverage; a few natural terms missing') rather than 5's comprehensive synonym coverage.

Distinctiveness Conflict Risk

The niche (self-contained HTML diagrams of code architecture for PRs/task plans) is distinct from document- or data-processing skills, with dedicated trigger terms. There is minor overlap risk with general chart/dataviz skills, which keeps it at anchor 4 ('Mostly distinct; minor overlap risk with closely related skills') rather than 5.