When your protagonist wins the fight but the victory feels hollow, you're probably missing the internal journey. This diagnostic helps you separate plot (what happens) from arc (who they become) by walking through the lie/want/need structure of positive, negative, and flat arcs. It catches common problems like informed arcs where you tell us they changed without showing it, or instant epiphanies that skip the struggle. The skill maps transformation beats to story structure and persists arc components to files so you don't lose your articulation of the false belief across sessions. Honest take: the lie/truth framework is old school screenwriting wisdom, but having it in diagnostic form with specific anti-patterns makes it actually actionable when you're stuck.
npx skills add https://github.com/jwynia/agent-skills --skill character-arc