Conciseness

The tool parameter/return documentation is non-obvious, skill-specific knowledge that earns its tokens, but the 'Common histone marks and their meaning' table is textbook biology Claude already knows, and the Enrichr-direction guidance is stated twice (Phase 2 'IMPORTANT' and Common Mistakes #4). This fits 'mostly efficient but includes some unnecessary explanation or could be tightened'; it is not 4 because the duplication and biology primer exceed 'minor instances'.

Actionability

Every tool has concrete parameter tables and copy-paste-ready JSON payloads (e.g., '{"search": "TP53", "limit": 5}') with documented return shapes — mostly executable guidance with minor gaps. It is not 5 because 'COMPUTE, DON'T DESCRIBE' mandates Python analysis yet no executable Python invocation pattern is shown, and Common Mistake #1 ('NOT jaspar_get_matrix') directly contradicts Phase 1, which documents jaspar_get_matrix as a valid tool; it is not 3 because the contradiction is localized and the rest is fully concrete.

Workflow Clarity

Phases 0–7 are explicitly sequenced and the five 'Common Use Patterns' map real question shapes to ordered tool chains, with 'LOOK UP DON'T GUESS... verify library names before calling enrichr' and the T1–T4 evidence grading acting as checkpoints. It is not 5 because there are no explicit verify→fix→retry feedback loops; it is not 3 because checkpoints are explicit rather than implicit and the destructive/batch cap does not apply to read-only data retrieval.

Progressive Disclosure

No bundle files exist, so the full API reference for ~15 tools (~200 lines of parameters and return shapes) is inlined in a 290-line SKILL.md. Section headers are well organized, but the per-tool reference is exactly the 'content that should be separate is inline' of anchor 3. It is not 4 because moving tool API details to a references/ file would materially shrink the always-loaded body; it is not 2 because the structure is good and nothing is buried.

Specificity

The description enumerates multiple concrete capabilities — 'TF-target inference (JASPAR motifs, ChIP-seq), motif scanning, eQTL integration, perturbation evidence (knockout/overexpression)' — with comprehensive, non-generic coverage, matching the top anchor. It is not 4 because the gaps are trivial, not 'minor gaps in coverage'.

Completeness

It explicitly answers both 'what' (the first sentence lists the capabilities) and 'when' ('Use for “which TF regulates gene X”, “which genes does TF Y target”, regulatory pathway reconstruction'), mirroring the score-5 exemplar structure. It is not 4 because the 'when' clause is explicit with concrete trigger phrases rather than merely present.

Trigger Term Quality

Quoted natural user phrasings ('which TF regulates gene X', 'which genes does TF Y target', 'regulatory pathway reconstruction') plus domain keywords (eQTL, ChIP-seq, knockout/overexpression) give comprehensive natural-term coverage. It is not 4 because the interrogative triggers capture the natural ways users ask this question, and no file extensions apply in this domain.

Distinctiveness Conflict Risk

'Gene regulatory network analysis', 'TF-target inference', and the quoted TF/gene-centric triggers carve a clear niche with minimal overlap risk against unrelated skills. It is not 4 because the trigger phrasings would not plausibly fire a different skill.