# Prerequisites for Using Ponytail Commands: Complete Setup Guide

> Learn the prerequisites for using Ponytail commands. Install Node.js and the plugin on your AI coding host with this complete setup guide. Get started today.

- Repository: [DietrichGebert/ponytail](https://github.com/DietrichGebert/ponytail)
- Tags: getting-started
- Published: 2026-09-09

---

**To run Ponytail commands, you only need Node.js installed on your system PATH and the ability to install the plugin on your AI coding host.**

The Ponytail plugin system adds intelligent code review and mode-switching capabilities to AI assistants like Claude Code and GitHub Copilot CLI. Understanding the prerequisites for using Ponytail commands ensures you can deploy these skills without unnecessary dependencies or external services. According to the DietrichGebert/ponytail source code, the architecture requires minimal infrastructure while delivering functionality across multiple host platforms.

## Core System Requirements

Ponytail operates with a deliberately minimal footprint, requiring only two essential components to function.

### Node.js Runtime on PATH

You must have a runnable `node` binary accessible from a non-interactive shell. The Claude Code and Codex plugins invoke tiny Node.js lifecycle hooks located in the repository's hook configurations; without `node` available, the skills remain silent and commands will not execute.

This requirement is documented in the [README.md Install section](https://github.com/DietrichGebert/ponytail/blob/main/README.md#install). The skills are pure JavaScript/TypeScript and run locally inside the host process, which is why Node.js is the only external runtime dependency.

### Host Plugin System Access

You need access to your AI coding host's plugin marketplace to add Ponytail as a skill. The `/ponytail` commands are exposed as plugin commands, meaning they will not appear in your interface until you complete the installation step for your specific host.

Supported hosts include Claude Code, Codex, GitHub Copilot CLI, Gemini, and other compatible platforms. Each host has specific marketplace commands detailed in the repository documentation.

## Optional Configuration Setup

While Ponytail functions immediately after installation, you can customize startup behavior through environment variables.

### Default Mode Environment Variable

Set the `PONYTAIL_DEFAULT_MODE` environment variable if you want a non-default intensity level on startup. This eliminates the need to specify the mode with every session.

Available modes include:
- `lite` – Minimal review intensity
- `full` – Standard review coverage
- `ultra` – Comprehensive analysis
- `off` – Disabled state

This configuration is documented in the [README.md Commands section](https://github.com/DietrichGebert/ponytail/blob/main/README.md#commands) and implemented in [`skills/ponytail/SKILL.md`](https://github.com/DietrichGebert/ponytail/blob/main/skills/ponytail/SKILL.md).

## Installation Commands by Host

Install Ponytail using your host's specific marketplace commands:

```bash

# Claude Code installation

/plugin marketplace add DietrichGebert/ponytail
/plugin install ponytail@ponytail

```

```bash

# GitHub Copilot CLI installation

copilot plugin marketplace add DietrichGebert/ponytail
copilot plugin install ponytail@ponytail

```

```bash

# Optional: Set default mode permanently

export PONYTAIL_DEFAULT_MODE=ultra

```

```bash

# Verify installation and usage

/ponytail            # Reports current mode

/ponytail full       # Switches to full intensity

/ponytail-review     # Runs review skill on current diff

```

All commands work immediately once `node` is available on your `$PATH`.

## Repository Structure and Key Files

Understanding the source layout helps verify prerequisites and customize behavior:

- **[`README.md`](https://github.com/DietrichGebert/ponytail/blob/main/README.md)** – Contains the primary user guide with install steps, command references, and optional configuration details.
- **[`AGENTS.md`](https://github.com/DietrichGebert/ponytail/blob/main/AGENTS.md)** – The always-on ruleset that adapters like Cursor and Windsurf read directly; requires no additional setup to function.
- **[`skills/ponytail/SKILL.md`](https://github.com/DietrichGebert/ponytail/blob/main/skills/ponytail/SKILL.md)** – Defines the `/ponytail` command structure and available sub-skills.
- **[`hooks/qoder-hooks.json`](https://github.com/DietrichGebert/ponytail/blob/main/hooks/qoder-hooks.json)** – Demonstrates how the plugin injects commands into the Qoder host environment.

## Summary

- **Node.js is mandatory** – A runnable `node` binary must exist on your system PATH for lifecycle hooks to execute.
- **Plugin installation required** – You must add Ponytail through your host's marketplace (Claude Code, Copilot CLI, etc.) to expose the commands.
- **Zero additional dependencies** – Ponytail ships all required code locally; no npm packages, Python runtimes, or external services needed.
- **Optional environment configuration** – Set `PONYTAIL_DEFAULT_MODE` to customize startup behavior without manual switching.

## Frequently Asked Questions

### Do I need to install additional npm packages to use Ponytail?

No. According to the `skills/` directory structure in the DietrichGebert/ponytail repository, Ponytail ships all required code as pure JavaScript/TypeScript that runs locally inside the host process. You do not need to run `npm install` or manage external dependencies.

### Which AI coding hosts support Ponytail commands?

Ponytail supports any host with a compatible plugin system, including Claude Code, Codex, GitHub Copilot CLI, and Gemini. The [`hooks/qoder-hooks.json`](https://github.com/DietrichGebert/ponytail/blob/main/hooks/qoder-hooks.json) file specifically demonstrates integration for the Qoder host, while [`AGENTS.md`](https://github.com/DietrichGebert/ponytail/blob/main/AGENTS.md) provides always-on rules for Cursor and Windsurf adapters.

### Can I use Ponytail without setting the PONYTAIL_DEFAULT_MODE variable?

Yes. The `PONYTAIL_DEFAULT_MODE` environment variable is entirely optional. You only need to configure it if you want to override the default mode on startup; otherwise, you can manually specify modes (lite, full, ultra, off) using the `/ponytail` command each session.

### Where are the skill definitions located in the repository?

The skill definitions reside in [`skills/ponytail/SKILL.md`](https://github.com/DietrichGebert/ponytail/blob/main/skills/ponytail/SKILL.md), which maps the `/ponytail` command and its sub-skills like `/ponytail-review`. This file works in conjunction with the hook configurations to register commands with your host's plugin system.