Conciseness

The body is dense and provider-specific with essentially no explanation of concepts Claude already knows: the 'Choose the Interface' and transport tables, and bullets on question design all carry non-obvious information. It sits at level 4 rather than 5 because of minor trimmable redundancy, e.g., the API-key retrieval/throw boilerplate repeated verbatim in both code examples. It is clearly above level 3 since there is no padded or unnecessary explanatory prose.

Actionability

Two complete, copy-paste-ready TypeScript examples with imports, env-var handling, calls, and expected result shapes, plus four runnable 'npm run tsx' commands with the exact env keys each needs — fully executable and covering the common cases per the level-5 anchor. It is not level 4 because there are no meaningful gaps in the executable guidance.

Workflow Clarity

A clear selection path is provided ('Choose the Interface' decision table routing to signature, native, or hybrid approaches), with explicit failure modes and constraints ('fail before network access', 'if (!apiKey) throw', unsupported features enumerated) and a concrete hybrid composition pattern, matching level 4's clear sequence with most checkpoints present. It is not level 5 because there are no explicit validation/error-recovery feedback loops (e.g., how to handle validation failures or retry guidance), though the skill is a reference skill, not a destructive multi-step workflow, so the level-3 cap does not apply.

Progressive Disclosure

The body is well-sectioned with clear headers, and deep detail is delegated to clearly signaled one-level-deep external links (the signature skill for full syntax, provider docs for primitives and models, runnable example files), matching level 4's good structure with appropriately placed content. It is not level 5 because there are no bundle reference files to split the ~220-line body into, so some reference-grade material (full transport/settings details, question-design guidance) is inlined in SKILL.md itself; it is well above level 3 since nothing is buried and navigation is easy.

Specificity

The description enumerates several concrete capabilities ('boolean/class signatures with value descriptions, provider trueThreshold, native Noul/Choice/Score questions, structured criteria, probability-based decisions, and explicit hybrid generation'), which matches the level-4 anchor of several specific actions with minor gaps. It falls short of level 5 because 'Covers...' lists feature topics rather than the concrete action verbs exemplified by the top anchor, and well above level 3's 1-2 concrete actions.

Completeness

The 'what' is clear (use Typesafe Jev models with @ax-llm/ax in TypeScript, covering signatures, native questions, and hybrid generation), but there is no 'Use when...' clause or equivalent explicit trigger guidance, capping completeness at 3 per the judging guidelines. This matches the level-3 anchor exactly: clear what, when missing.

Trigger Term Quality

It includes the natural terms a user of this niche SDK would say — 'Typesafe Jev models', '@ax-llm/ax', 'TypeScript', 'Noul/Choice/Score' — giving good keyword coverage matching the level-4 anchor. Not level 5 because no synonyms, abbreviations, or alternative phrasings are offered beyond the canonical names.

Distinctiveness Conflict Risk

The description is tied to a single specific provider and SDK ('Typesafe Jev models with @ax-llm/ax') with distinct primitive names (Noul/Choice/Score), giving it a clear niche with minimal conflict risk, matching the level-5 anchor. It is not level 4 because there is no noticeable overlap with closely related skills.