Conciseness

The body is 75 lean lines with zero background on what Ax is or how generic retry/reward loops work; every line states Ax-specific behavior Claude could not guess ('Original instruction values are restored in finally', 'streamingForward(...) is unsupported'), matching the 'every token earns its place' anchor.

Actionability

Both API calls and a complete reward function are shown as concrete TypeScript with real option names (n, threshold, rewardDescription, samplesPerRound), and API behaviors are enumerated rule by rule. It falls short of the copy-paste-ready 5 anchor because 'score(prediction)' is an undefined placeholder and 'addAssert(...)' is named but never shown in use.

Workflow Clarity

It opens with an unambiguous decision rule ('Use bestOfN(...) when you can score complete outputs independently. Use refine(...) when failed rounds should produce feedback'), then separates the validation tools, enumerates strategy selection, and specifies streaming fallback with internal feedback loops (assertion failures feed correction text into the retry loop). It is a reference/decision skill rather than a sequenced multi-step workflow with external validation checkpoints, so it sits below the 5 anchor but clearly above 3.

Progressive Disclosure

This is a single-file skill with no references/, scripts/, or assets/ directories and no external references are needed at this size; the body is cleanly sectioned (Validation, APIs, Reward Functions, Strategies, Advice, Streaming) with no buried or nested pointers, matching the simple-skill provision that well-organized sections score 5 when no external references are needed.

Specificity

The description enumerates several concrete domain items ('reward functions, thresholds, native sample selection, serial attempts, generated advice, and attempt diagnostics') beyond just naming the Ax bestOfN/refine domain, but the only action verbs are 'writing or reviewing' — a topic list rather than the comprehensive concrete-action coverage of the 5 anchor.

Completeness

The explicit 'Use this skill when writing or reviewing...' clause answers 'when' clearly and the enumerated topics convey the 'what', but the what is embedded in the when-clause with no standalone capability statement and no user-mention trigger phrases like the 5 anchor's 'or when the user mentions PDFs'.

Trigger Term Quality

Terms like 'bestOfN', 'refine', 'reward functions', and 'thresholds' are natural phrases a user working in this niche would say, giving good keyword coverage; common variations such as 'best-of-N', 'reward model', or 'AxGen' are missing, keeping it below the 5 anchor.

Distinctiveness Conflict Risk

'Ax bestOfN/refine' carves out a clear niche with minimal wrong-skill triggering, but broadly shared terms like 'reward functions' and 'thresholds' could overlap with general RLHF or evaluation skills, which is the minor overlap risk described by the 4 anchor rather than the 5 anchor's minimal conflict risk.