Ponytail is a set of instructions and extensions that guides AI coding agents toward smaller, simpler code changes while retaining safety checks. It is intended for developers using agents such as Claude Code, and the catalogue entries are its skills, instructions, plugin, and rule.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add DietrichGebert/ponytail --skill ponytail-debtgit clone --depth 1 https://github.com/DietrichGebert/ponytailWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/dietrichgebert/ponytail/ponytail-debt)<a href="https://agentmods.dev/skills/dietrichgebert/ponytail/ponytail-debt"><img src="https://agentmods.dev/badge/skills/dietrichgebert/ponytail/ponytail-debt/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/dietrichgebert/ponytail/ponytail-debt"><img src="https://agentmods.dev/badge/skills/dietrichgebert/ponytail/ponytail-debt.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00029 | $0.00434 |
| Opus 5.5 | $0.00012 | $0.00174 |
| Sonnet 5.5 | $0.00006 | $0.00087 |
| Haiku 4.5 | $0.00003 | $0.00043 |
Grade A, and why
ponytail-debt scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
2 near-identical copies found in the catalogue:
- ponytail-debt — 100% identical, 26 lines differ
- ponytail-debt — 100% identical, 26 lines differ
What it actually says
Every deliberate ponytail shortcut is marked with a shortcut: comment naming
its ceiling and upgrade path (older code may say ponytail:). This collects them into one ledger so a deferral
can't quietly become permanent.
Scan
Grep the repo for comment markers, skipping .git and everything the
.gitignore files ignore (dependencies, build output, caches, in any stack):
git grep --no-index --exclude-standard -nE '(#|//|/[*]) ?(shortcut|ponytail):' (add other comment prefixes if your stack uses them)
If the user names their own marker word (/ponytail-debt TODO), grep for that word instead.
Each hit is one ledger row. The comment prefix keeps prose that merely mentions the convention out of the ledger. Skip hits that are not a deferral, like a note about a keyboard shortcut.
Output
One row per marker, grouped by file:
<file>:<line>, <what was simplified>. ceiling: <the limit named>. upgrade: <the trigger to revisit>.
The convention is shortcut: <ceiling>, <upgrade path>, so pull the ceiling
and the trigger straight from the comment. Want an owner per row too? add
git blame -L<line>,<line>.
Flag the rot risk: any marker comment that names no upgrade path or
trigger gets a no-trigger tag, those are the ones that silently rot.
End with <N> markers, <M> with no trigger. Nothing found: No shortcut debt. Clean ledger.
Boundaries
Reads and reports only, changes nothing. To persist it, ask and it writes the
ledger to a file (e.g. PONYTAIL-DEBT.md). One-shot.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 10d ago Changed · -1 lines d55354743bf3
- 13d ago Changed d36a041765b6
- 17d ago Changed · +3 lines · -2 tokens per session 111a7abae3f0
- 22d ago Changed a88162567a54
- 1mo ago First seen · 42 lines · 31 tokens per session scan A b0281c1d96fa
ponytail-debt is a skill published in the GitHub repository DietrichGebert/ponytail (176,199 stars, last pushed 8d ago), licensed MIT. It adds 29 tokens to every session and 434 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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