Conciseness

Lean and efficient with short headers and executable code; it assumes Claude's competence and adds no padding or explanation of basic fp-ts concepts, matching the anchor 5 example.

Actionability

Every snippet is copy-paste ready TypeScript with imports, concrete inputs, and shown outputs, covering pipe, flow, Option, Array, and reusable patterns across the common cases.

Workflow Clarity

As a simple single-purpose read-only reference with no destructive or batch operations, the simple-skill exception applies; the single action is unambiguous and a 'When to Use' table clarifies the pipe-vs-flow decision.

Progressive Disclosure

Under 50 lines with no need for external references and well-organized section headers, meeting the rubric's exception that such skills can score 5 on progressive disclosure from structure alone.

Specificity

Names the domain (pipe and flow in fp-ts) and lists several concrete operations ('chain functions, compose operations, build data pipelines') with only minor coverage gaps, sitting between anchors 3 and 4 but closer to 4.

Completeness

Provides both a clear 'what' ('Quick reference for pipe and flow') and an explicit 'when' ('Use when user needs to chain functions, compose operations, or build data pipelines in fp-ts'), but the 'what' is thin so it does not reach the fully comprehensive anchor 5.

Trigger Term Quality

Includes natural user-facing phrases like 'chain functions' and 'compose operations' alongside 'pipe', 'flow', and 'fp-ts', giving good keyword coverage though a few synonyms are missing.

Distinctiveness Conflict Risk

Scoped tightly to fp-ts pipe and flow with distinct, library-specific triggers, giving it a clear niche with minimal conflict risk against other skills.