Ponytail at 169,651 Stars: a 2,721-Byte Ruleset, and the 26% Saving That Shrinks to 1.7% Once the Code Is Checked

Wed, 21 Oct 2026 00:00:00 +0000

Ponytail is one markdown file. The project says so itself, in a section called The prompt: “Ponytail is one prompt: skills/ponytail/SKILL.md. The compact version, for agents that read a rules file, is AGENTS.md. Everything else in this repo loads that prompt into different agents.”

That is 2,721 bytes for AGENTS.md. Around it: 214 files, 12,066,966 bytes, and 169,651 GitHub stars. The ratio is 4,435 to 1.

This article is about the number that gets quoted — 53% less code, 41% faster, 26% cheaper, 45% fewer tokens — and what happens when you open the per-task table behind it and sort it by which tasks have a correctness check. Two statistics of mine reproduce the vendor’s headline to the decimal, so the table is the one they used. Sorted differently, it says something the headline does not.

AI Agent Skills on SoloSoft

Ponytail at 169,651 Stars: a 2,721-Byte Ruleset, and the 26% Saving That Shrinks to 1.7% Once the Code Is Checked