Ponytail publishes measured deltas for a restraint skill: 54% less code, 20% cheaper, 27% faster.

0xwilliamortiz/ponytail-improved hit 476 stars in one day for a skill that makes coding agents write less rather than more, framed as "the laziest senior dev in the room." The README publishes numbers from real Claude Code sessions on a real repo: roughly 54% less code written and up to 94% where the agent over-builds, with 100% of safety guards retained, linked to a full writeup in the repo. Two small Node lifecycle hooks, works across Claude Code, Codex, Copilot CLI, OpenCode, and others. Self-reported, but the mechanism is obvious and the install cost is nothing.