The body is lean: a short intro, a single copy-paste prompt template, and a brief Tips list, with no padding explaining what a PRD is or how libraries work. It stays below the verbose anchor-1 and anchor-2 levels and assumes Claude's competence.

The prompt template is fully executable with $ARGUMENTS, a fallback question, an explicit six-section PRD structure, and concrete tone directives ("Prefer short sentences", "Flag assumptions"), matching the copy-paste-ready anchor-3 example for an instruction skill.

This is a simple single-task skill (run the template to produce a PRD) where the single action is unambiguous; per the simple-skills note, workflow clarity can score 3 without an explicit multi-step sequence, and the Tips section adds a light iterate-then-refine step.

The skill is under 50 lines with no need for external references, and its content is split into clearly labeled sections (Prompt Template, Tips), so well-organized sections alone meet anchor 3 per the under-50-lines guideline.

"Turn messy ideas into a clear, structured PRD" names the domain (PRD) and a single transform action, but does not enumerate multiple specific concrete actions like the anchor-3 example ("extract text, fill forms, merge documents"). It is above the vague anchor-1 level because the action and output are concrete.

It states what it does ("Turn messy ideas into a clear, structured PRD") and gives an explicit "Use when you have rough notes, Slack threads, or half-formed ideas..." trigger, satisfying both the what and the when at anchor 3.

"rough notes, Slack threads, or half-formed ideas" are natural phrases a user might say, but the description relies on one framing and lacks common synonyms/variations (e.g. "write a spec", "requirements doc", "feature spec") that the anchor-3 example lists in abundance.

The PRD/spec-writing niche is clear and its triggers (rough notes, Slack threads, half-formed ideas → PRD) are distinct enough that it is unlikely to fire for unrelated skills.