Conciseness

The 585-line body extensively teaches material Claude already knows: fp-ts pipe/Option/Either API usage, plus 'Plain language translation' glossaries explaining what O.fromNullable and E.right mean. There is real value in the judgment-based sections (When NOT to Use FP, The Readability Rule), which keeps it above anchor 1, but the padding and over-explanation are pervasive rather than occasional, matching 'noticeably verbose; several unnecessary explanations or padded sections'.

Actionability

Nearly every pattern ships as complete, executable TypeScript with imports and a concrete before/after pair, covering the common cases (null chains, JSON parsing, validation, async chains). It falls short of anchor 5 on minor gaps: User/Employee/fetchOrderTE are never declared, the callback-hell 'Before' snippet calls an undefined fetchUser(id, cb), and section 4 declares 'const doubled' twice, which would not compile as written.

Workflow Clarity

As a pattern guide rather than a procedure, it provides clear decision workflows: explicit 'When to use / When to skip' bullets for pipe, the Golden Rule, the Readability Rule as a pre-check ('Would a junior developer understand this?'), and a sequenced learning path from the 5 core patterns to quick wins to refactors. It misses anchor 5 because there is no explicit ordered procedure with checkpoints — the 'Middle Ground (Often Best)' guidance leaves the central decision implicit.

Progressive Disclosure

Sections are well organized with clear headers and a useful cheat sheet, but the entire ~585-line skill lives inline in SKILL.md with no reference files at all — 'Common Refactors' and 'Quick Wins' are clearly separable into references/*.md. This matches 'some structure but... content that should be separate is inline'; it is above 2 because navigation and organization within the file are genuinely good, but below 4 because nothing is offloaded despite the length.

Specificity

The description 'a practical, jargon-free guide to functional programming' names the domain but contains no concrete actions — it never says what the guide does (teach pipe/Option/Either patterns, refactor code, review FP usage). It matches the anchor 'names the domain but actions are minimal or generic'; it is above 1 because the domain is clearly stated, but below 3 because zero specific capabilities are listed.

Completeness

The 'what' is reasonably clear ('a practical, jargon-free guide to functional programming'), but the 'when' is entirely absent — there is no 'Use when...' clause or equivalent trigger guidance, which caps completeness at 3 per the judging guidelines. Not 4 because 'when' is not even weakly present; not 2 because the 'what' does state a specific domain and approach.

Trigger Term Quality

It includes the primary natural phrase 'functional programming', which users genuinely say, but misses every common variation and synonym the body actually covers: 'fp-ts', 'TypeScript', 'Option', 'Either', 'monads', 'null checks'. This sits between 'one or two generic keywords' (2) and 'good keyword coverage' (4) — the one keyword present is highly natural, but coverage is thin.

Distinctiveness Conflict Risk

'Functional programming' is a somewhat specific domain with a differentiating angle ('pragmatic', '80/20', 'jargon-free'), but the description could still overlap with general FP, TypeScript style, or code-review skills, and it offers no distinct trigger phrases to disambiguate. It is more specific than 'very broad; high overlap risk' (2) but lacks the niche-defining triggers of 4.