Ponytail open-source plugin trains AI coding agents to write minimal code

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Ponytail is a free, MIT-licensed ruleset plugin designed to prevent AI coding agents from generating unnecessarily bloated code. It works by injecting a priority ladder into the agent's context each turn, guiding it to reuse existing code, leverage standard libraries, or use native platform features before writing anything new. Compatible with over 20 tools including Claude Code, Cursor, Copilot, Codex, and Gemini CLI, it can be installed via plugin commands or by copying rules files directly into a project. The tool deliberately excludes shortcuts around validation, security, error handling, and accessibility, focusing only on eliminating redundant logic. Its stated goal is not minimizing token count but ensuring agents write only what a given task genuinely requires.

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