Conciseness

The body is lean and assumes Claude's competence — tersely listing operating rules, fields, and an executable example without explaining REST/IPD concepts Claude already knows; every section earns its tokens.

Actionability

Provides a copy-paste-ready executable bash example piping JSON into scripts/rest_request.py, a concrete base_url, named routes, and multiple complete example JSON payloads rather than pseudocode.

Workflow Clarity

This is a simple single-action skill (issue one REST request); the single action is unambiguous across Operating rules, Execution behavior, and the Execution example, satisfying the simple-skill allowance for a 3 without needing multi-step checkpoints.

Progressive Disclosure

At under 50 lines with well-organized sections and a single real one-level reference to scripts/rest_request.py (verified present), the skill meets the simple-skill allowance for a 3 with no nested references.

Specificity

Names multiple concrete actions — 'Submit compact IPD REST requests', retrieve 'HLA allele and cell-level metadata', and 'save raw JSON or text' — matching the multi-action anchor rather than the single-domain anchor at 2.

Completeness

States both what it does ('Submit compact IPD REST requests for HLA allele and cell-level metadata') and an explicit 'Use when a user wants concise IPD summaries' trigger, satisfying the both-what-and-when anchor.

Trigger Term Quality

Covers the natural terms a user of this domain would say — 'IPD', 'HLA allele', 'cell-level metadata', 'IPD summaries', 'IPD query API' — rather than only technical jargon or a single generic term.

Distinctiveness Conflict Risk

Targets a clear niche (IPD HLA allele/cell metadata via a specific public API) with distinct triggers unlikely to collide with other skills.