What problem does it solve? Turning a written implementation plan into working code requires disciplined task-by-task execution, verification, and review; this Skill orchestrates that process so plans are followed exactly without skipped steps or silent failures. ## Core Features & Use Cases - Critical plan review before execution: Loads the plan, raises concerns with the user before starting, and creates todos for each task. - Codex-delegated implementation: Classifies each task, picks the appropriate GPT-5.6 model tier, dispatches work to Codex, and reviews every diff against the plan with fix cycles via session resume. - Automatic fallback mode: If the Codex preflight fails, tasks are implemented inline instead, with the fallback announced explicitly. - Use Case: You have a multi-task implementation plan from a planning session and want it executed in a separate session with per-task verification, code review, and a clean handoff to branch completion. ## Quick Start Ask Claude to execute the implementation plan in plans/my-feature.md using the executing-plans skill.