Conciseness

The prose is dense and imperative with no explanation of concepts Claude already knows — no definition of HTML, SEO, or reporting basics; every section carries operational rules ("No paragraph runs past two sentences", "Gloss every term of art on first use"). It is not a 5 because the ~155-line inline starter template with its explanatory CSS comments is a substantial token block that could be trimmed or externalized, the rubric's definition of "minor instances of over-explanation that could be trimmed".

Actionability

Fully executable throughout: exact tool calls and parameters ("pass its `reportId` to `save_report`", "call `set_report_sharing` with the same `projectId`"), exact limits ("The hard cap is 500,000 bytes"), exact formats ("MMM D, YYYY", "Read the full report: <url>"), and a complete copy-paste HTML starter template covering the common case. The save-failure instruction is a concrete fix-and-retry step, not vague direction.

Workflow Clarity

The lifecycle is clearly sequenced (pre-flight checks in "Before you write" → writing rules → title/summary → closing section → HTML constraints → sharing → post-save behavior) with explicit validation and recovery: the numbered dedup/revision checklist, the guard "if what comes back looks cut off, send the user to the app instead of saving over it", and the feedback loop "If the save fails, the error names the limit and the value. Fix that one thing and save again." This matches anchor 5's sequence-with-error-recovery pattern; anchor 4 would require missing checkpoints, and none are missing.

Progressive Disclosure

The skill is a single self-contained file with no bundle directories, and the body is well-sectioned (Goal, Before you write, Writing rules, HTML constraints, Starter template, Primitives, Guardrails) making it easy to navigate. It is not a 5 because there is no reference structure at all and the full starter template is inlined — a plausible candidate for an assets/ file — though since the template is used on every run rather than conditionally, this is a minor organization gap rather than the "content that should be separate is inline" of anchor 3.

Specificity

"Write and save an OpenSEO report as one self-contained HTML page" names the domain and two concrete actions (write, save) plus a format constraint, matching "names domain and 1-2 concrete actions, but not comprehensive". It does not list several distinct actions, so it falls below anchor 4.

Completeness

Both parts are explicit: the "what" ("Write and save an OpenSEO report as one self-contained HTML page") and the "when" with concrete trigger phrases ("Use when a skill has finished its research, and whenever the user asks for a report, check-in, or summary, or names a report template"). This matches the anchor-5 example pattern exactly; anchor 4 would require the when-clause to be less explicit, which it is not.

Trigger Term Quality

Natural user phrasing is present — "asks for a report, check-in, or summary, or names a report template" — giving good keyword coverage of how users would phrase the need. A few natural synonyms (e.g. "write-up", "findings", "brief") are missing, so it does not reach anchor 5's comprehensiveness.

Distinctiveness Conflict Risk

"OpenSEO report" carves a clear niche with distinct tooling (report templates, save_report workflow), but the trigger "whenever the user asks for a... summary" is a broad word that overlaps with general summarization skills, giving minor conflict risk. Mostly distinct rather than the minimal risk of anchor 5.