Conciseness

At ~950 lines the body is noticeably verbose: 30-40 line 'BEFORE' try/catch-hell strawman examples are repeated across sections, and the 'Before/After Summary' at the end near-verbatim repeats patterns already shown in sections 1-4. Claude already knows what nested try/catch looks like; these padded demonstrations and the duplicated summary section could be cut with no loss of instruction.

Actionability

Nearly all guidance is concrete, executable fp-ts code: a reusable fetchJson wrapper, Do-notation pipelines, retry with exponential backoff, a typed Prisma error wrapper, and Express handler integration. Minor gaps only — several snippets assume undefined helpers (fetchUserFromApi, chargePayment, fetchOrder) and the section-1 fetchJson is re-implemented differently in section 5, which keeps it below fully copy-paste-ready.

Workflow Clarity

Content flows in a clear logical sequence from wrapping promises, to chaining, to parallel execution, to error recovery, to handling results, each framed with an explicit problem/solution structure. There are no validation checkpoints, but the skill is a pattern reference rather than a destructive or batch procedure, so the feedback-loop cap does not apply; it falls just short of the 'explicit validation steps' anchor.

Progressive Disclosure

Section headers are clear and the quick-reference card aids navigation, but the skill is entirely monolithic: no references/, scripts/, or assets/ directories exist, and ~950 lines — including the full API client, Prisma repository, and Node file-operation examples — are all inlined in SKILL.md. Content that clearly belongs in separate reference files is inline, matching the anchor for present-but-unsplit structure.

Specificity

The description names the domain ('async patterns using TaskEither') and gestures at 1-2 concrete actions ('clean pipelines instead of try/catch hell, with real API examples'), but omits concrete capabilities like promise wrapping, retries, fallbacks, and parallel execution. It matches the anchor for naming domain with 1-2 concrete actions but not comprehensive coverage, and is below the 'several specific actions with minor gaps' anchor.

Completeness

It has a clear 'what' (practical async patterns using TaskEither with clean pipelines and real API examples) but no 'when' clause — there is no 'Use when...' or equivalent explicit trigger guidance anywhere in the description. Per the judging guideline, a missing 'Use when...' clause caps completeness at 3.

Trigger Term Quality

Includes natural phrases users would actually say: 'async patterns', 'try/catch hell', 'pipelines', 'TaskEither', 'API examples'. Good keyword coverage overall, though common variations like 'error handling', 'promises', and 'fp-ts' are missing (they only appear in tags, not the description), keeping it below the comprehensive anchor.

Distinctiveness Conflict Risk

'TaskEither' anchors this firmly in the fp-ts/functional-programming niche, making it clearly distinguishable from generic async or Promise skills. Minor overlap risk remains with general TypeScript async/error-handling skills since it doesn't name fp-ts explicitly. Not a 5 because the trigger surface could still catch generic async requests.