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Ponytail
Ponytail guides AI coding agents to write the least code needed, favoring standard libraries and native tools.
About Ponytail
Ponytail is a plugin for AI coding agents that directs the agent to check existing code, standard libraries, platform features and installed dependencies before writing new code, and to add a small test when logic involves branches, loops, parsing, money or security. It provides /ponytail-review for changes and /ponytail-audit for whole repositories, which examine touched code for bugs, security issues, load, missing tests, speed and removable code, and end replies with what was skipped or not checked.
It lists support for Claude Code, Codex, Copilot, Gemini, Cursor, OpenCode, pi and others, with install commands for several CLIs and an INSTALL.md for the rest. The stated install sources are DietrichGebert/ponytail and @dietrichgebert/ponytail on npm.
Key features
- Guides agent to reuse existing code, standard library, platform features
- Adds small test for branches, loops, parsers, money or security logic
- Reviews changed code plus touched code for bugs and missing tests
- Audits whole repository with same review checks
- Reports skipped items and unchecked risks at end of reply
- Supports Claude Code, Codex, Copilot, Gemini, Cursor, OpenCode, pi
Best for: Developers who use AI coding agents and want changes that reuse existing code and platform features.
Good for
- In its 39-task test with Opus 5.5, reports 53% fewer lines of code and 45% fewer output tokens
- Reports 98% of risky logic ships with a test, compared with 68% without
- Review looks at code touched by a change, not only the diff, and lists fix and consequence for each finding
Ponytail at a glance
- Website
- ponytail.dev
- Category
- AI & Machine Learning › AI Coding Tools
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Ponytail FAQ
How does Ponytail decide whether to write new code?
It checks in order: skip if unneeded, reuse codebase, use standard library, use platform, use installed dependency, use one line, then write needed code plus a test if it has logic.
What is the difference between /ponytail-review and /ponytail-audit?
/ponytail-review checks a diff by reading touched code; /ponytail-audit applies the same checks to the whole repo.
Where should Ponytail be installed from?
Only from DietrichGebert/ponytail or @dietrichgebert/ponytail on npm, with separate commands for Claude Code, Codex, Copilot CLI, Gemini CLI and pi.
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