Adding one "Always invoke for X" line per skill description raised Claude Code skill recall from 46% to 67%
r/ClaudeAI (writeup at coder-eval.com)·low signal
A team shipping about 20 Claude Code skills found that more than half the prompts that should have triggered a skill triggered none. They also found their detector only recognized Claude's Skill tool call, while Codex and Antigravity read SKILL.md from disk. Adding a trigger line tied to a marker only that skill owns, such as a file extension, lifted micro-recall to 67.3% at about 0.96 precision. The one generic "review" skill got slightly worse, because it had no unique marker to anchor on.