The agentskills.io spec recommends two things in every description: start with an action verb, and include a trigger phrase like "use when..." that tells the routing layer when to fire the skill. They take five seconds to add and they're the difference between a skill an agent picks up and a skill that sits unused in the catalog. I sampled 500 skills at random from a 1,436-skill public corpus and measured both. 5.8% follow both recommendations. 61.8% follow neither. The full breakdown of what the SKILL.md ecosystem actually looks like in production, as of late April 2026. Methodology Corpus: sickn33/antigravity-awesome-skills at HEAD on April 29, 2026. This is the largest publicly bundled SKILL.md collection in a single repo (1,436 indexed skills with metadata for category, source, and risk classification). Sample: 500 skills, random with seed 42 for reproducibility. Tool: skillcheck v1.2.0 from PyPI.…