Claude Code requires plugin.json (not just marketplace.json) to load
plugins. The plugin.json must include a "skills" field pointing to
the skill directory location.
Without this file, the plugin appears in `/plugins installed` but
the skill is not loaded into the prompt.
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Viet Tran <viettranx@gmail.com>
