ponytail-gain SKILL.md skillA
ponytail-gain from dietrichgebert/ponytail is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dietrichgebert/ponytail/ponytail-gain@git:20261015.84740e3Pins git:20261015.84740e3 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dietrichgebert/ponytail
- Path
skills/ponytail-gain/SKILL.md- Versions recorded
- 4
- Latest version
- git:20261015.84740e3, committed Oct 15, 2026
- First version recorded
- Jun 18, 2026
- Size
- 2,164 bytes
- Repository stars
- 182,080
- License
- MIT
Show ponytail's measured savings (code, cost, speed) from the benchmark. One-shot display. Use for /ponytail-gain, "what does ponytail save", "ponytail impact".
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Ponytail Gain Display this scoreboard when invoked. One-shot: do NOT change mode, write flag files, or persist anything. The figures are the published agentic benchmark of Ponytail 5: headless Claude Code (Opus 5.5, default effort) on 39 tasks (feature tickets in a real FastAPI + React repo, bug fixes, security and privacy cases, small apps), 5 runs each, against the same agent without the skill. 18 of the tasks have hidden checks for correctness and safety. Each figure is the geometric mean of the per-task medians. They are measured, not computed from the current repo. Source: `benchmarks/results/2026-10-07-agentic.md` and the README. ## Scoreboard Render plain ASCII bars. The bar length shows ponytail as a share of the no-skill baseline; the label carries the exact figure: ``` ponytail gain benchmark · 39 tasks × 5 runs · Opus 5.5 no-skill ████████████████████ 100% Lines of code █████████··········· 47% ▼ 53% Output tokens ███████████········· 55% ▼ 45% Cost ███████████████····· 74% ▼ 26% Time ████████████········ 59% ▼ 41% Hidden checks passed 97% (no-skill 96%) …
Read the whole file at its exact version.
How to install
mdr add dietrichgebert/ponytail/ponytail-gain@sha256:231034a896d6762eThe line at the top of this page pins the label git:20261015.84740e3, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_sfyasocwtufrtydi)
6 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Jun 18, 2026 and Oct 15, 2026, about one every 39 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261015.84740e3 latest | 2026-10-15 | 84740e3 | 2,164 B | A | view · diff |
| git:20261008.01cbf81 | 2026-10-08 | 01cbf81 | 2,206 B | A | view · diff |
| git:20261005.8c0cccf | 2026-10-05 | 8c0cccf | 2,190 B | A | view · diff |
| git:20260618.15749f7 | 2026-06-18 | 15749f7 | 1,973 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2164 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
dietrichgebert/ponytail · 182,080 stars · license MIT · pushed 2026-10-29 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_sfyasocwtufrtydi GET https://markdownregistry.com/api/v1/resolve?ref=dietrichgebert/ponytail/ponytail-gain GET https://markdownregistry.com/api/v1/blob/231034a896d6762e4b5c8468287083422c56b499119976ec9f76821f7d083090
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from dietrichgebert/ponytail
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