How to Install Ponytail for GitHub Copilot CLI: A Complete Guide

Install Ponytail for GitHub Copilot CLI in two commands: add the marketplace source with copilot plugin marketplace add DietrichGebert/ponytail, then install with copilot plugin install ponytail@ponytail.

Ponytail is a plugin that extends the GitHub Copilot CLI with specialized commands for code review and analysis workflows. This guide walks you through the exact installation steps, verification commands, and key configuration files you'll need to get started with the DietrichGebert/ponytail plugin.

Prerequisites for Installing Ponytail

Before running the installation commands, ensure you have:

• GitHub Copilot CLI installed and authenticated on your system
• Network access to GitHub's plugin marketplace
• Sufficient permissions to install CLI plugins

The installation process does not require cloning the repository or manual file placement—the Copilot CLI handles all plugin management automatically.

Step-by-Step Ponytail Installation

Add the Ponytail Marketplace Source

First, register the plugin's location with the Copilot CLI marketplace system:

copilot plugin marketplace add DietrichGebert/ponytail

This command tells the CLI where to find updates and version information for the Ponytail plugin. The DietrichGebert/ponytail identifier points to the GitHub repository hosting the plugin distribution.

Install the Ponytail Plugin

Once the marketplace entry exists, install the plugin itself:

copilot plugin install ponytail@ponytail

The ponytail@ponytail syntax specifies the plugin name and namespace. This pulls the latest released version from the marketplace and integrates it into your Copilot CLI environment.

Verify the Installation

Confirm successful installation by listing installed plugins:

copilot plugin list

You should see ponytail in the output alongside other installed plugins.

Using Ponytail Commands After Installation

Once installed, Ponytail exposes namespaced slash commands accessible in interactive Copilot CLI sessions:

Command	Purpose
/ponytail:ponytail	Core Ponytail functionality
/ponytail:ponytail-review	Code review assistance

Example usage:

# Invoke the main Ponytail command

/ponytail:ponytail ultra

# Run a code review with Ponytail

/ponytail:ponytail-review

These commands are prefixed with /ponytail: to prevent naming collisions with other plugins or built-in Copilot commands.

Key Files in the Ponytail Repository

Understanding these source files helps with troubleshooting and advanced configuration:

• README.md — Contains the Install section with authoritative installation instructions
• plugin.json — Defines plugin metadata consumed by the Copilot CLI during installation and updates
• hooks/copilot-hooks.json — Configures lifecycle hooks that enable Ponytail's advanced features when running through Copilot
• AGENTS.md — Provides always-on rules for Copilot's instruction-only mode (used if the plugin isn't installed)
• scripts/uninstall.js — Cleanup script for removing Ponytail's state if you need to reset or remove the plugin

All files reside in the repository root and are accessible via direct GitHub links.

Uninstalling or Resetting Ponytail

If you need to remove the plugin, use the standard Copilot CLI command:

copilot plugin uninstall ponytail@ponytail

For complete state cleanup, the repository includes scripts/uninstall.js to remove any residual configuration files.

Summary

• Install Ponytail for GitHub Copilot CLI using two marketplace commands: copilot plugin marketplace add followed by copilot plugin install
• Ponytail commands use the /ponytail: namespace to avoid conflicts
• The plugin.json file controls metadata and version management
• Full documentation lives in the repository's README.md Install section

Frequently Asked Questions

Why do I need to run two separate commands to install Ponytail?

The Copilot CLI plugin marketplace uses a two-phase installation for security and flexibility. The first command registers the plugin's source location, while the second actually downloads and installs the code. This separation lets you audit marketplace sources before trusting them with installation privileges.

What does the ponytail@ponytail syntax mean in the install command?

The format is plugin@namespace. The first ponytail is the plugin identifier, and the second ponytail specifies the namespace under which its commands are registered. This prevents command collisions when multiple plugins provide similar functionality.

Can I use Ponytail without installing the plugin?

Yes—if you cannot install plugins, reference the AGENTS.md file in the repository. This file contains the always-on ruleset for Copilot's instruction-only mode, giving you access to Ponytail's logic without formal plugin installation.

Where does the Copilot CLI store installed plugins?

The CLI manages plugin locations internally. You don't need to manually manage files in the DietrichGebert/ponytail repository—the copilot plugin commands handle all path resolution, updates, and removal automatically.

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}