Ponytail
马尾辫
He says nothing. He writes one line. It works.
他沉默不语。他写下一行代码。然后就能运行。
~54% less code (up to 94%) · ~20% cheaper · ~27% faster · 100% safe
Measured on real Claude Code sessions editing a real open-source repo (FastAPI + React), against the same agent with no skill. ~54% is the mean across 12 feature tasks (Haiku 4.5, n=4); it reaches 94% where an agent over-builds (a date picker) and is near zero where the code is already minimal. ponytail keeps every safety guard while a bare "write one-liners" prompt drops one. (The earlier single-shot benchmark reported 80-94% as a flat figure; against a fair agentic baseline that is the per-task ceiling, not the average.) Full writeup · reproduce it.
代码减少约54%（最高94%）· 成本降低约20% · 速度提升约27% · 100%安全
实测数据来自Claude Code编辑真实开源项目(FastAPI + React)的会话，对比相同但无此技能的代理。54%是12个功能任务的平均值(Haiku 4.5, n=4)；当代理过度构建(如日期选择器)时可达94%，在代码已最简处接近零。ponytail保留所有安全防护，而单纯"写单行代码"的提示会丢失一项。(早期单次基准测试报告的80-94%是统一数值；相对于合理的代理基准线，这是每项任务的上限而非平均值。) 完整报告 · 复现方法.
You know him. Long ponytail. Oval glasses. Has been at the company longer than the version control. You show him fifty lines; he looks at them, says nothing, and replaces them with one.
Ponytail puts him inside your AI agent.
你认识他。留着长马尾。椭圆眼镜。在公司的时间比版本控制系统还久。你给他看五十行代码；他看一眼，一言不发，然后换成一行。
马尾辫把他装进了你的AI代理里。
Before / after
改造前后
You ask for a date picker. Your agent installs flatpickr, writes a wrapper component, adds a stylesheet, and starts a discussion about timezones.
With ponytail:
你要一个日期选择器。你的代理会安装flatpickr、写封装组件、添加样式表，然后开始讨论时区问题。
使用马尾辫后：
<!-- ponytail: browser has one -->
<input type="date"><!-- ponytail: 浏览器自带 -->
<input type="date">More survivors in examples.
更多幸存案例见examples。
Numbers
数据
The honest measurement is a real agent doing real work: a headless Claude Code session editing tiangolo’s full-stack-fastapi-template (a real FastAPI + React repo), scored on the git diff it leaves behind. Twelve feature tickets, the same agent with and without the skill, n=4, Haiku 4.5.
真实测量来自实际工作场景：无头Claude Code会话编辑tiangolo的全栈fastapi模板（真实的FastAPI+React仓库），根据留下的git diff评分。12个功能需求单，同一代理启用/禁用该技能，n=4，Haiku 4.5。
| vs no-skill baseline | LOC | tokens | cost | time | safe |
|---|---|---|---|---|---|
| ponytail | -54% | -22% | -20% | -27% | 100% |
| caveman | +14% | +37% | +32% | +18% | 100% |
| yagni-oneliner | -33% | - | - | - | 95% |
| 对比无技能基准线 | 代码行数 | token数 | 成本 | 时间 | 安全性 |
|---|---|---|---|---|---|
| 马尾辫 | -54% | -22% | -20% | -27% | 100% |
| 原始方案 | +14% | +37% | +32% | +18% | 100% |
| YAGNI单行 | -33% | - | - | - | 95% |