PonyTail

PonyTail is a Claude Code skill that constrains the model to write minimal code: before generating anything it asks whether the code needs to exist, whether it's already in the codebase, and whether the standard library handles it. Independently benchmarked at ~54% less code and ~20% cheaper runs with no quality loss. Important: it only works installed as a plugin with a SessionStart hook — copying the SKILL.md into a folder does nothing.