Names the domain (in-app paywalls, upgrade screens) and lists types of screens (upsell modals, feature gates), but doesn't describe concrete actions like 'design', 'write copy for', 'optimize conversion rates', or 'A/B test'.

Strong 'when' clause with explicit triggers, but the 'what' is weak - it says 'create or optimize' but doesn't specify what actions or outputs the skill provides. The description focuses heavily on triggers without explaining capabilities.

Excellent coverage of natural terms users would say: 'paywall', 'upgrade screen', 'upsell', 'feature gate', 'convert free to paid', 'freemium conversion', 'trial expiration screen', 'limit reached screen', 'plan upgrade prompt', 'in-app pricing'.

Explicitly distinguishes itself from 'page-cro' for public pricing pages and clearly defines its niche as 'in-product upgrade moments where the user has already experienced value' - very clear boundary.

Content is reasonably efficient but includes some unnecessary framing ('You are an expert...') and could be tighter in places. The component lists and anti-patterns sections are well-structured but some bullet points state obvious concepts.

Provides concrete, copy-paste ready paywall templates with specific copy examples, clear component structures, and specific metrics to track. The feature lock, usage limit, and trial expiration paywall examples are immediately usable.

Covers when to show paywalls and the upgrade flow sequence, but lacks explicit validation checkpoints. No feedback loops for testing if paywalls are working or steps to verify implementation before launch.

Well-organized with clear sections, appropriate length for an overview skill, and properly signals external references (experiments.md, related skills). Content is appropriately structured without deep nesting.