Conciseness

The body is ~33 lines of purely operational content — rules, I/O contracts, one runnable command, and two compact query patterns — with no explanation of GraphQL or gnomAD concepts Claude already knows. Every token earns its place (the Execution block's reuse of the Input example query is a trivial, harmless duplication), matching the 'lean and efficient; assumes Claude's competence' anchor rather than 4's 'minor instances that could be trimmed'.

Actionability

The Execution section gives a copy-paste-ready command (`echo '{"query":...}' | python scripts/gnomad_graphql.py`), and Input provides a complete real-world example with an actual variant ID, dataset, and max_items value. Output and error contracts are fully enumerated, covering the common cases — the 'fully executable; copy-paste ready; covers common cases' anchor, not 4 which allows 'minor gaps'.

Workflow Clarity

This is a simple single-task skill whose one action is unambiguous: pipe one JSON object into the script and interpret the documented response. The enumerated error codes (invalid_json, network_error, graphql_error, etc.) supply failure feedback, and the operation is a read-only query — not destructive or batch — so the validation cap does not apply; the simple-skill exception for an unambiguous single action is met, placing it above 4.

Progressive Disclosure

At 33 lines with well-organized sections (rules, behavior, Input, Output, Execution, References), the single referenced file `scripts/gnomad_graphql.py` exists in the bundle, and the References section explicitly and correctly states no further runtime references are needed. Per the rubric's simple-skill guidance (under 50 lines, no need for external references), well-organized sections alone warrant the top anchor.

Specificity

The description names the domain and three concrete capabilities ("frequency, gene constraint, and variant context queries") with a specific verb ("Submit compact gnomAD GraphQL requests"), matching the 'several specific actions; minor gaps' anchor. It falls short of 5 because it lists query domains rather than a comprehensive set of distinct actions, and is well above 3's '1-2 concrete actions'.

Completeness

Both what ("Submit compact gnomAD GraphQL requests for frequency, gene constraint, and variant context queries") and when ("Use when a user wants concise gnomAD summaries") are explicitly stated in third person. It is below 5 because the when clause offers only one trigger phrase rather than concrete, varied trigger situations (e.g., 'when the user mentions variant IDs, constraint scores, or population frequency').

Trigger Term Quality

Natural keywords like "gnomAD", "GraphQL", "frequency", "gene constraint", and "variant" are present and would be said by users needing this skill, but common variations are missing ("population frequency", "allele frequency"/"AF", "gnomAD v4", "variant ID"). This matches 'good keyword coverage; a few natural terms missing' rather than the comprehensive synonym coverage of 5.

Distinctiveness Conflict Risk

"gnomAD GraphQL" carves out a clear niche with distinct triggers (gnomAD, gene constraint, variant frequency) that no generic skill would claim, matching the 'clear niche with distinct triggers; minimal conflict risk' anchor. It is not a 4 because it does not overlap with closely related skills — the scope is tightly and uniquely scoped.