The body is lean and operational with no filler or explanations of concepts Claude already knows; every line is actionable guidance such as 'ONE atomic action... 1–2 lines max' and 'Max 8 items, ever'.

As an instruction-only skill it provides concrete, copy-paste-ready behavioral rules: an exact response format (Current step, a '----' divider, Still remaining) with hard numeric constraints and explicit rules for adding, auditing, and merging steps.

The process is clearly sequenced (build canonical checklist, give one step, list remaining, move next item up when done, say complete when done) with an explicit validation feedback loop: 'Before every response, audit the current step plus Still remaining against the canonical checklist.'

At under 50 lines with a single task and no need for external references, the body is cleanly organized into a Response format section and a Rules section, which satisfies the simple-skill allowance for a top score.

The description names the domain ('setting up anything step by step') and concrete behavioral mechanics ('one current step at a time, then always lists every remaining setup step'), but it describes a behavior pattern rather than listing multiple specific discrete actions in the manner of the anchor-3 example.

It explicitly answers what ('Walk the user through setting up anything step by step') and when (an explicit 'Use when...' clause with concrete trigger conditions), matching the both-what-and-when anchor.

It includes natural user utterances as quoted triggers ('help me set up X', 'walk me through this', 'setup-help') plus 'setting up, configuring, installing, or getting something working', giving good coverage of phrases users would actually say.

An explicit 'Differentiator:' clause carves out a distinct niche (one current step plus a complete remaining-steps list after each response), making it unlikely to trigger for the wrong skill.