Conciseness

The body is dense and assumes domain competence (the CIRCE JSON is 'abridged', edge cases are stated as terse imperatives), but a few tokens could be trimmed: the opening definition of 'computable phenotype', the eMERGE/PheKB historical comparison ("This mirrors how eMERGE and PheKB phenotypes mix..."), and the open-source/licensing paragraph repeat frontmatter statements. Anchor 4 ('minor instances of over-explanation that could be trimmed') fits better than 5, where every token would earn its place.

Actionability

Concrete, realistic CIRCE JSON with real concept IDs and an executable `openmed.analyze_text` call anchor the guidance, but the NLP-to-OMOP materialization steps are comment placeholders rather than code ("# 2) Write a derived OBSERVATION ... e.g. Observation: ..."), and SQL generation/validation is described only at command-less, high level ("generate SQL, run on a (synthetic/de-identified) database"). That is 'mostly executable with minor gaps' (anchor 4), not fully copy-paste ready (anchor 5) nor pseudocode-dominant (anchor 3).

Workflow Clarity

The six-step workflow has a clear sequence and an explicit validate step with an iterate loop ("Validate against OMOP CDM: generate SQL, run on a (synthetic/de-identified) database, review cohort counts; iterate with PheValuator-style checks"), and this is analytics (non-destructive) so the batch/destruction cap does not apply. However, the validation checkpoints lack executable commands (no WebAPI endpoint, script, or tool invocation), matching anchor 4 ('most checkpoints present; minor validation gaps') rather than anchor 5's fully explicit validate->fix->retry loop.

Progressive Disclosure

No bundle files exist (no references/, scripts/, or assets/), and the ~137-line body is well-sectioned with an appropriately abridged inline JSON example and a one-level 'Standards & references' list of external URLs. Structure is good (anchor 4), but everything lives inline in SKILL.md — bulkier material (a fuller CIRCE schema reference, validation/PheValuator detail) could be split into a references/ file, so it falls short of anchor 5's 'content appropriately split' with well-signaled file references.

Specificity

The description lists multiple concrete, third-person actions — "Authors computable phenotype and cohort definitions", "combining standard concept sets with NLP-derived features", "reuse PheKB or OHDSI Phenotype Library logic", "build concept sets", "augment code-based criteria with text features" — with comprehensive coverage of the skill's capabilities. Anti-drift check: it does not merely name the domain (anchor 3) or leave minor gaps (anchor 4); the action list is complete and specific.

Completeness

It clearly answers 'what' (first sentence: authors computable phenotype/cohort definitions combining concept sets with NLP features) and 'when' ("Use when the user wants to define a patient cohort, write a computable phenotype, reuse PheKB or OHDSI Phenotype Library logic, build concept sets, or augment code-based criteria with text features") with concrete trigger phrases. Anti-drift check: both parts are explicit, matching the anchor-5 example's structure; the 'when' clause is not merely present but specific.

Trigger Term Quality

An explicit, natural keyword list ("phenotype, cohort definition, OHDSI, ATLAS, CIRCE, OMOP CDM, concept set, PheKB, Phenotype Library, eMERGE, computable phenotype") covers the terms a user working in this domain would actually say, including synonyms (PheKB / Phenotype Library / eMERGE, cohort definition / computable phenotype). Anti-drift check: coverage goes beyond 'good with a few missing' (anchor 4); no natural variation is obviously absent for this domain.

Distinctiveness Conflict Risk

The niche is clear (OHDSI/OMOP cohort phenotyping) and triggers like ATLAS, CIRCE, PheKB, and eMERGE are essentially unique to this domain, minimizing wrong-skill triggering. It even delimits its boundary against the adjacent OpenMed NLP skill ("Pairs adjacent to OpenMed"). Anti-drift check: minor overlap with generic NLP/coding skills exists but is explicitly fenced, keeping this above anchor 4.