What problem does it solve? Non-trivial work done by hand is slow, inconsistent, and impossible for a reviewer to re-verify without redoing it. This Skill enforces a working principle: for any non-trivial task, build a deterministic tool (codemod, script, generator, or delegate skill) that does or proves the work, so the artifact itself can be rerun and reviewed. ## Core Features & Use Cases - Lever-First Decision Rule: Apply to edits, migrations, analyses, and checks; skip only when the task is trivial and verifiable at a glance. - Prove-by-Rerun Workflow: Do the first unit by hand, build the tool, then diff its output against the hand-done version to validate correctness. - Delegation Contract: When fanning work out to subagents, encode the recipe, verification contract, and do-not-touch fences in a skill file outside the delegates' write scope. - Use Case: When migrating hundreds of files to a new API, write a codemod, rerun it on a hand-converted sample to confirm identical output, and commit the script so reviewers can rerun it. ## Quick Start Ask the AI to apply the build-the-lever principle to your next migration or bulk edit so it produces a rerunnable script instead of manual changes.
