A plugin that instructs an AI coding agent to prefer the smallest working solution, including using existing language or platform features before adding code or dependencies.

Use it during coding tasks where you want the agent to favor simple implementations, standard-library features, and fewer lines.

It helps limit unnecessary abstractions and speculative features by applying a “do only what is needed” approach.

ponytail — Plugin by hyeongchankim

Install

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.

agentmods

npx agentmods add plugins/hyeongchankim/poneytail/marketplace

Claude Code

/plugin marketplace add hyeongchankim/poneytail

Clone the repo

git clone --depth 1 https://github.com/hyeongchankim/poneytail

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin 100% copy Near-identical to another mod in the catalogue.

Security

Grade A, and why

ponytail 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 yesterday.

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.

Origin

This is a copy

100% identical to ponytail — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude-plugin/marketplace.json · 18 lines

What it actually says

{
  "$schema": "https://anthropic.com/claude-code/marketplace.schema.json",
  "name": "ponytail",
  "description": "Lazy senior dev mode for AI agents. The best code is the code you never wrote.",
  "owner": {
    "name": "Dietrich Gebert",
    "url": "https://github.com/DietrichGebert"
  },
  "plugins": [
    {
      "name": "ponytail",
      "description": "Forces the laziest solution that works. YAGNI, stdlib first, one line over fifty.",
      "source": "./",
      "category": "productivity"
    }
  ]
}

Files

What ships with it

1 file beside marketplace.json in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

plugin.json 342 B

Changes

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.

yesterday First seen · 18 lines scan A 5c17acc0d307

Subscribe to this mod's changes

ponytail is a plugin published in the GitHub repository hyeongchankim/poneytail (10 stars, last pushed 2mo ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. It is 100% identical to ponytail, differing in 0 lines, and is treated as a copy.

ponytail

Getting it into your agent

Grade A, and why

Nothing flagged

This is a copy

What it actually says

What ships with it

What this file has done since we first saw it

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