Conciseness

The body is lean and operational with no concept explanations, but the max_results guidance appears twice ("start with `max_results=10` and only increase it if the first slice is insufficient" and "Increase `max_results` gradually instead of asking for large association dumps in one call"), a minor redundancy that could be trimmed. Fits anchor 4 rather than the every-token-earns-its-place anchor 5.

Actionability

Fully executable guidance: a copy-paste-ready invocation (`echo '{"grch38":"10:112998590-C-T","max_results":10}' | python scripts/ukb_topmed_phewas.py`), four concrete input patterns covering the common cases, an enumerated output field list, and a defined failure format — all consistent with the actual script in the bundle. Matches anchor 5.

Workflow Clarity

A simple, single-purpose lookup skill under 50 lines where the action is unambiguous, so the simple-skill exception applies. Feedback loops are present (increase max_results when truncated, re-run in long conversations) and the failure path is defined via `ok=false` with `error.code`/`error.message`; the operation is read-only so no destructive/batch cap applies.

Progressive Disclosure

Under 50 lines with well-organized sections and no need for external references, which the body states explicitly ("No additional runtime references are required; keep the import package limited to this file and `scripts/ukb_topmed_phewas.py`"). The referenced script path exists in the bundle, so the structure matches the simple-skill anchor 5.

Specificity

Names the domain and several concrete actions ("fetch compact UKB-TOPMed PheWAS summaries", "accepting rsID, GRCh37, or GRCh38 input", "resolving to the required GRCh38 query"), but coverage is not fully comprehensive — what the summaries contain is only implied via the trigger clause. Fits anchor 4 (several specific actions, minor gaps) rather than 5.

Completeness

Explicitly answers both questions: the first sentence states what the skill does (fetch summaries, accept three input forms, resolve to GRCh38), and "Use when a user wants concise UKB-TOPMed association results for one variant" is a concrete explicit when-clause. Matches the anchor-5 example structure; not 4 because the when-clause is explicit rather than vague.

Trigger Term Quality

Covers the natural vocabulary a user would say for this task — "UKB-TOPMed", "PheWAS", "rsID", "GRCh37", "GRCh38", "variant", "association results" — with both "summaries" and "results" phrasings. No common synonym is obviously missing, matching the comprehensive-coverage anchor.

Distinctiveness Conflict Risk

Occupies a clear niche (single-variant UKB-TOPMed PheWAS lookups) with distinctive trigger terms (UKB-TOPMed, PheWAS, rsID, GRCh37/38); minimal overlap with any other plausible skill. Matches the clear-niche anchor.