Conciseness

The body is lean and well-organized with only minor editorial gloss ('A good PRD isn't a feature list', 'Non-goals prevent scope creep as much as goals drive it') that could be trimmed; it is efficient but not quite the every-token-earns-its-place level of 5.

Actionability

It provides a concrete section-by-section template, a sequenced 4-step process, and an explicit output structure (Summary, Problem, Users & Context, Goals/Non-goals, Requirements, Success Metrics, Risks & Open Questions); the missing worked example PRD is the gap that keeps it from 5.

Workflow Clarity

'How to work' lays out a clear 4-step sequence and 'If you can't state the problem, the feature isn't ready' acts as a soft gate on step 1; no explicit validation checkpoints are present, but they are not required for non-destructive doc writing, so it sits at 4 rather than 5.

Progressive Disclosure

The skill is under 50 lines, single-purpose, and needs no external references, so the well-organized sections (When to use, What a PRD needs to answer, Principles, How to work, Output format) qualify it for the simple-skill 5 exception.

Specificity

The description gives one concrete action ('Turn a feature idea into a clear PRD') plus an output breakdown (problem, users, requirements, success metrics), matching the anchor that names a domain with limited distinct actions; it is not a 4 because only one verb is offered and the rest are deliverables rather than separate actions.

Completeness

The 'what' is clearly stated but there is no 'Use when...' clause or equivalent trigger guidance, which per the rubric caps completeness at 3 and matches the anchor for a clear what with missing when.

Trigger Term Quality

'PRD', 'feature idea', 'requirements', and 'success metrics' are natural terms a user would say, giving good keyword coverage; it falls short of 5 because common synonyms like 'product spec', 'one-pager', or the spelled-out 'product requirements document' are missing.

Distinctiveness Conflict Risk

'PRD' names a clear niche with low conflict risk, but minor overlap with adjacent writing skills and the absence of explicit trigger phrasing keep it from a 5.