c3-skill

Triggers on /c3 or architecture questions in projects with .c3/ directory. Phrases: "adopt C3", "onboard", "where is X", "audit architecture", "check docs", "add component", "implement feature", "what breaks if I change X", "add ref", "coding standard", "edit the canvas", "add prd/user-story". Ops: onboard, query, audit, change, ref, rule, canvas, sweep. The CANVAS is your architecture's own vocabulary; onboarded facts FREEZE; work advances by change-units. Classifies intent, loads the reference, runs the CLI.

Delegate well-scoped coding, analysis, and review tasks to the OpenAI Codex CLI (gpt-5.5) as a cross-model collaborator. Use for implementation chunks you want a second model to write or cross-check, independent second-opinion review of a design or diff, and applying Codex-authored changes. Triggers: "ask codex", "have codex implement/review X", "second opinion from codex", "cross-check with codex".