# Ponytail (AI) Ponytail is an open-source ([[MIT License]]) AI-agent plugin/skill that enforces minimalist code generation, "He says nothing. He writes one line. It works." It counters the tendency of coding agents to over-engineer (extra dependencies, boilerplate, building when something already exists) by injecting a pragmatic decision ladder the agent must follow before writing code. ## The decision ladder > Does this need to exist? → no: skip it (YAGNI). Stdlib does it? → use it. Native platform feature? → use it. Installed dependency? → use it. One line? → one line. Only then: the minimum that works. Safety guardrails (validation, error handling, security, accessibility) remain non-negotiable. ## Key aspects - Intensity levels: lite, full, ultra, off - Code-review commands: `/ponytail-review`, `/ponytail-audit` - Ships as Node.js lifecycle hooks; works across 14+ agents/IDEs ([[Claude Code]], Codex, GitHub Copilot CLI, OpenCode, Gemini CLI, Cursor, Windsurf, Cline, …) via plugins, rules files, or instruction-only modes - JavaScript + Python codebase ## Measured results Against baseline agents on real FastAPI + React tasks (mean over 12 tasks): 54% fewer lines of code, 22% fewer tokens, 20% lower cost, 27% faster, 100% safety compliance. ## References - https://github.com/DietrichGebert/ponytail ## Related - [[Claude Code]] - [[AI Agents]] - [[Agentic Engineering]] - [[Context Engineering]] - [[MIT License]]