Ponytail - Makes your AI agent think like the laziest senior dev

Ponytail is a plugin and ruleset that guides AI agents to write minimal, necessary code by following a "ladder" of checks before writing anything: does this need to exist, can stdlib do it, is there a native platform feature, can an installed dependency do it, can it be one line, and only then write the minimum that works. It is designed to be lazy, not negligent—keeping validation, security, and accessibility intact. Benchmarks on real Claude Code sessions (FastAPI + React) showed ~54% less code, ~20% cheaper, and ~27% faster compared to no-skill, while maintaining 100% safety. It installs as plugins for Claude Code, Codex, GitHub Copilot CLI, Gemini, OpenCode, and others, with always-on rules and commands like /ponytail (to set intensity levels) and /ponytail-review (to review diffs for over-engineering). 

https://github.com/DietrichGebert/ponytail

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