Conciseness

The body is lean and assumes Claude's competence — operating rules, I/O contracts, and copy-paste examples with no padding or explanations of concepts Claude already knows, matching the 'lean and efficient' anchor.

Actionability

Provides fully executable bash invocation and three concrete JSON request patterns, plus exact base_url values — copy-paste ready guidance rather than pseudocode.

Workflow Clarity

A simple single-task REST skill with unambiguous Input/Output/Execution sections; the rubric permits a 3 for clear simple skills, and there are no destructive or batch operations that would require validation feedback loops.

Progressive Disclosure

Content is well-organized into short sections with a single one-level-deep reference to the real scripts/rest_request.py bundle file, and an explicit References section confirming no deeper nesting — appropriate for a sub-50-line skill.

Specificity

Lists multiple concrete actions: 'core metadata, Search API queries, and FASTA downloads' — matches the anchor that enumerates several specific operations rather than vague language.

Completeness

Answers both what ('Submit compact RCSB PDB requests...') and when via the explicit 'Use when a user wants concise RCSB summaries' clause, satisfying the 'what AND when' anchor.

Trigger Term Quality

Covers natural terms a user would say — 'RCSB PDB', 'Search API', 'FASTA', 'RCSB summaries' — giving good domain-specific coverage rather than jargon.

Distinctiveness Conflict Risk

The narrow RCSB PDB niche with domain-specific triggers makes it unlikely to fire for unrelated skills, matching the 'clear niche with distinct triggers' anchor.