ponytail
Makes your AI agent think like the laziest senior dev in the room. The best code is the code you never wrote.
Ponytail is an agent skill that teaches AI coding assistants to write minimal, necessary code by applying a seven-rung decision ladder before generating solutions. It encourages agents to reuse existing code, leverage standard library features, and prefer native platform capabilities over writing new implementations. Benchmarked against baseline agents, it produces approximately 54% less code on average while maintaining safety and correctness. The skill integrates with over 20 AI coding clients including Claude Code, Codex, Cursor, Windsurf, and GitHub Copilot through various installation methods.
Key Features
Use Cases
- 01Preventing AI coding assistants from over-engineering simple features like date pickers by preferring native HTML inputs
- 02Reducing token costs and latency in extended AI coding sessions while maintaining code quality
- 03Teaching AI agents to reuse existing codebase patterns instead of rewriting similar functionality
- 04Auditing repositories for over-engineered code that could be simplified using standard library or platform features
- 05Tracking and managing deferred simplification opportunities marked with 'ponytail:' comments
- 06Enforcing minimal code practices across development teams using AI coding assistants
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ponytail — FAQ
What is Ponytail and what does it do?+
Ponytail is an agent skill that injects a decision-making framework into AI coding assistants, teaching them to write only necessary code by checking if solutions already exist in the codebase, standard library, or platform before generating new implementations. It reduces code output by an average of 54% while maintaining safety and correctness.
How do I install Ponytail in Claude Code?+
Send two separate commands in Claude Code: first '/plugin marketplace add DietrichGebert/ponytail', then '/plugin install ponytail@ponytail'. Node.js must be on your PATH for lifecycle hooks to work.
Which AI coding clients work with Ponytail?+
Ponytail supports Claude Code, Codex, GitHub Copilot CLI, Cursor, Windsurf, Cline, OpenCode, Gemini CLI, Qoder, Devin CLI, Grok Build, Hermes Agent, and many others. Installation methods vary: some use plugin commands, others require copying rule files to specific directories.
Does Ponytail require API keys or configuration?+
No API keys or configuration files are required. An optional config file at ~/.config/ponytail/config.json or PONYTAIL_DEFAULT_MODE environment variable can set the default intensity level (lite/full/ultra/off), but Ponytail works out of the box with the 'full' default.
Is Ponytail free to use?+
Yes, Ponytail is open source under the MIT license and free to use. It actually reduces costs by lowering token usage by approximately 20% in AI coding sessions.
Can I use Ponytail with other agent skills like caveman?+
Yes, Ponytail is designed to work alongside caveman and other skills. Caveman reduces what the agent says (prose), while Ponytail reduces what it builds (code), so they complement each other without overlap.
How do I install ponytail?+
Open the source repository on GitHub and follow its README. ponytail is a skill — MCP Agents Market links you directly to the official repo.
Is ponytail free?+
ponytail is an open-source project hosted on GitHub. Check the repository for its license and any usage requirements.