Ponytail

What it does

Ponytail makes AI coding agents write the least code that works. Stdlib over custom, native over deps, one line over fifty. 54% less code, safety never cut.

// A ruleset that makes your AI coding agent write the least code that works — like a senior dev who's been paged at 3am one too many times. - class CacheManager: - def __init__(self, ttl, maxsize): - self._store, self._lock = {}, Lock() - # ...44 more lines you maintain forever + @lru_cache(maxsize=1000) + def fetch(...): ... // same behavior. 48 fewer lines. zero bugs in code that no longer exists. // medians across 12 feature tasks on a FastAPI + React repo. // validation, error handling, security and accessibility are never simplified away. // also OpenCode, Cursor, Windsurf, Cline, Kiro, Zed and more — 14+ agents. // full list in the README . Builds what you asked, names the lazier…from ponytail.dev

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