Skill Host Compatibility Run the same host-compat gate CI uses on before opening a skill PR. The check is for Codex and Cursor copies, not Claude-only runtime quality. When to Activate - Adding or editing a skill under - Copying a skill into or - A review asks whether a skill is safe to install into Codex or Cursor - CI reports findings Core Concepts Canonical skills live in . Codex loads . Cursor loads a smaller subset. CONTRIBUTING documents that sync as manual. only checks that exists and that / are usable YAML. only sees . This script is the cross-tree gate: 1. Claude-only substitutions i…