Lean and efficient: no padding explaining concepts Claude knows, every section (Input, Core Workflow, Action Format, Critical Rules, Example) carries actionable content. It does not fall into the verbosity traps shown in the bad examples.

Provides fully concrete, executable guidance — exact action syntax 'click[value]', 'search[keywords]', the strict one-action-per-turn rule, and a complete worked example with realistic observation and response blocks. Copy-paste ready for the agent loop.

A clearly sequenced 5-step Core Workflow with an explicit validation checkpoint ('Compare Price... If not, navigate back immediately') and rejection/branching logic, plus a two-turn example showing the select-then-buy feedback sequence.

For a simple single-task skill under 50 lines with no external references needed, the well-organized sections (Input, Workflow, Format, Rules, Example) satisfy the simple-skills carve-out for a top score.

Lists several concrete actions — 'extracting price, comparing color availability, validating specifications, and confirming option selections' — and specifies a concrete output format ('Thought:' assessment followed by 'click[value]'), matching the 'multiple specific concrete actions' anchor.

Explicitly answers both what (verifies attributes by extracting/comparing/validating) and when via an explicit 'Use when...' clause, meeting the 'clearly answers both' anchor.

Provides good coverage of natural user phrasing — 'check if a product matches requirements', 'verify product details before buying', 'confirm item specifications', 'validate that price, color, size... satisfy the user's constraints' — terms a user would naturally say.

Scoped to a distinct niche — web shop product detail page attribute verification with a click-based action format — making it unlikely to trigger for unrelated skills.