### Install Ponytail plugin in Codex

Source: https://github.com/dietrichgebert/ponytail/blob/main/README.md

Install the plugin for Codex by adding the marketplace and then adding the plugin. Run both commands in a terminal. After installation, open `/hooks` in Codex, trust its two lifecycle hooks, and start a new thread.

```bash
codex plugin marketplace add DietrichGebert/ponytail
codex plugin add ponytail@ponytail
```

--------------------------------

### Parse and build URL query strings with query-string

Source: https://github.com/dietrichgebert/ponytail/blob/main/examples/url-params.md

Shows the query-string package approach: install it (4.5 kB gzipped, 3.5M downloads/week) and use qs.parse/qs.stringify to parse and build URL query strings. The parse example returns an object with repeated keys as arrays; the build example produces a string with repeated keys.

```bash
npm install query-string
# 4.5 kB gzipped, 3.5M downloads/week
```

```js
import qs from "query-string";

// Parse
const params = qs.parse(location.search);
// → { page: "2", sort: "name", tags: ["js", "css"] }

// Build
const url = qs.stringify({ page: 2, sort: "name", tags: ["js", "css"] });
// → "page=2&sort=name&tags=js&tags=css"
```

--------------------------------

### Install ponytail for Kimi Code

Source: https://github.com/dietrichgebert/ponytail/blob/main/INSTALL.md

Install ponytail in Kimi Code by running this slash command, then reload the session or start a new one. The plugin puts AGENTS.md into the system prompt every turn and adds six skills.

```text
/plugins install https://github.com/DietrichGebert/ponytail
```

--------------------------------

### Install ponytail for Oh My Pi (omp)

Source: https://github.com/dietrichgebert/ponytail/blob/main/INSTALL.md

Install ponytail for Oh My Pi (omp) by adding the marketplace and installing the plugin package. omp runs ponytail's Pi extension unchanged, injecting the ruleset every turn; start a new session after installing. Verified with omp 18.6.1.

```bash
omp plugin marketplace add DietrichGebert/ponytail
omp plugin install ponytail@ponytail
```

--------------------------------

### Install Cursor hooks for ponytail

Source: https://github.com/dietrichgebert/ponytail/blob/main/INSTALL.md

Clones the ponytail repository and installs the Cursor hooks, which merge into ~/.cursor/hooks.json (or add --project for a project-specific file) while preserving existing hooks. The entries run node from that checkout, so keep the installation location or re-run after moving.

```bash
git clone https://github.com/DietrichGebert/ponytail
node ponytail/scripts/cursor-hooks.js install
```

--------------------------------

### Install numeral or accounting

Source: https://github.com/dietrichgebert/ponytail/blob/main/examples/number-formatting.md

Install the numeral or accounting library to format numbers without Ponytail.

```bash
npm install numeral
# or: npm install accounting
```

--------------------------------

### Install ponytail for GitHub Copilot CLI

Source: https://github.com/dietrichgebert/ponytail/blob/main/INSTALL.md

Install the ponytail plugin for GitHub Copilot CLI by adding its marketplace and then installing the plugin package. After installation, use slash commands such as "/plugin marketplace add DietrichGebert/ponytail" and "/plugin install ponytail@ponytail" in interactive sessions.

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

--------------------------------

### Install Ponytail plugin in Claude Code

Source: https://github.com/dietrichgebert/ponytail/blob/main/README.md

Install the plugin in Claude Code as two separate slash commands: first add the marketplace, then install the plugin. Execute them in order in the Claude Code CLI.

```text
/plugin marketplace add DietrichGebert/ponytail
```

```text
/plugin install ponytail@ponytail
```

--------------------------------

### Example Copilot CLI plugin commands using ponytail namespace

Source: https://github.com/dietrichgebert/ponytail/blob/main/INSTALL.md

Copilot CLI namespaces plugin commands by plugin name, so you invoke them with the 'ponytail:' prefix. 'ultra' is an example level command, while 'ponytail-review' is a review command.

```text
/ponytail:ponytail ultra
/ponytail:ponytail-review
```

--------------------------------

### Install Ponytail plugin for Devin CLI

Source: https://github.com/dietrichgebert/ponytail/blob/main/INSTALL.md

Installs Ponytail as a Devin plugin. The skills are then available as /ponytail:ponytail, /ponytail:ponytail-review, and so on.

```bash
devin plugins install DietrichGebert/ponytail
```

--------------------------------

### Install slowapi and redis

Source: https://github.com/dietrichgebert/ponytail/blob/main/examples/rate-limit.md

Install the required packages for Redis-based rate limiting.

```bash
pip install slowapi redis
```

--------------------------------

### Install react-infinite-scroll-component

Source: https://github.com/dietrichgebert/ponytail/blob/main/examples/infinite-scroll.md

Install the react-infinite-scroll-component package before using the InfiniteScroll component in a project without Ponytail.

```bash
npm install react-infinite-scroll-component

```

--------------------------------

### Install ponytail for Pi agent harness

Source: https://github.com/dietrichgebert/ponytail/blob/main/INSTALL.md

Install the ponytail plugin for the Pi agent harness using the git URI. This injects the ruleset every turn.

```text
pi install git:github.com/DietrichGebert/ponytail
```

--------------------------------

### Install ponytail for OpenCode with plugin add

Source: https://github.com/dietrichgebert/ponytail/blob/main/INSTALL.md

Install ponytail as an OpenCode plugin using the plugin add command. This injects the ruleset every turn and adds /ponytail commands and levels.

```bash
opencode plugin add @dietrichgebert/ponytail
```

--------------------------------

### Install Ponytail extension for Antigravity CLI (agy)

Source: https://github.com/dietrichgebert/ponytail/blob/main/INSTALL.md

Installs the Ponytail extension for Antigravity CLI (agy). This command reuses the repo's gemini-extension.json. Until the migration around June 18, 2026, the old command 'gemini extensions install' also works. For an always-on rule, place the ruleset in .agents/rules/.

```bash
agy plugin install https://github.com/DietrichGebert/ponytail
```

--------------------------------

### Install OpenClaw skill via ClawHub

Source: https://github.com/dietrichgebert/ponytail/blob/main/INSTALL.md

Installs Ponytail as an OpenClaw skill from ClawHub. The review, audit, debt, gain, and help skills install similarly with their own commands. OpenClaw applies this on coding tasks and exposes it as a /ponytail command. Without ClawHub, copy the .openclaw/skills/ponytail directory into ~/.openclaw/skills/.

```bash
clawhub install ponytail
```

--------------------------------

### Production email validation with email-validator library

Source: https://github.com/dietrichgebert/ponytail/blob/main/examples/email-validation.md

Production-ready email validation using the email_validator library. Requires installation with 'pip install email-validator'. Returns True if valid, False if EmailNotValidError is raised. Includes usage examples.

```python
from email_validator import validate_email, EmailNotValidError

def validate_email_production(email: str) -> bool:
    """
    Validates email using the email_validator library.
    More reliable for production use.
    
    Install with: pip install email-validator
    """
    try:
        # Validate and normalize the email
        valid = validate_email(email)
        return True
    except EmailNotValidError:
        return False


# Usage
if __name__ == "__main__":
    print(validate_email_production("user@example.com"))  # True
    print(validate_email_production("invalid@"))          # False
```

--------------------------------

### Install and enable ponytail plugin for Grok

Source: https://github.com/dietrichgebert/ponytail/blob/main/INSTALL.md

Installs and enables the ponytail plugin for Grok. The plugin is disabled by default, so it must be enabled via the /plugins UI or the config file. After enabling, start a new session or reload plugins to see the skills.

```bash
grok plugin install DietrichGebert/ponytail --trust
```

```toml
[plugins]
enabled = ["ponytail"]
```

--------------------------------

### Group by key with lodash groupBy

Source: https://github.com/dietrichgebert/ponytail/blob/main/examples/group-by.md

Install lodash and use its groupBy function to group an array of objects by a key. The example groups orders by their status property, producing an object with arrays for each status.

```bash
npm install lodash
```

```js
import { groupBy } from "lodash";

const byStatus = groupBy(orders, "status");
// → { pending: [...], shipped: [...], delivered: [...] }
```

--------------------------------

### Install ponytail skills CLI with npx skills add DietrichGebert/ponytail

Source: https://github.com/dietrichgebert/ponytail/blob/main/INSTALL.md

Copies the six ponytail skill files into the skills folder of many agents. Use --agent to select the agent, e.g., --agent bob for IBM Bob; --skill '*' takes all six without asking; --global installs for your user instead of the project. Installs skills only; for always-on rules add AGENTS.md or use a plugin.

```bash
npx skills add DietrichGebert/ponytail
```

--------------------------------

### Install lodash for deep clone

Source: https://github.com/dietrichgebert/ponytail/blob/main/examples/deep-clone.md

Install lodash as a dependency to use cloneDeep for deep cloning.

```bash
npm install lodash
```

--------------------------------

### Install slowapi with pip

Source: https://github.com/dietrichgebert/ponytail/blob/main/examples/rate-limit.md

Install the slowapi package, which is the recommended approach for adding rate limiting to FastAPI.

```bash
pip install slowapi
```

--------------------------------

### Run GPT benchmark with promptfoo

Source: https://github.com/dietrichgebert/ponytail/blob/main/benchmarks/results/2026-06-16-correctness-gate-fix.md

Runs the GPT benchmark arms with promptfoo, repeating each cell 20 times serially to avoid transient quota 429s. Requires OPENAI_API_KEY in ../.env.

```bash
# GPT arms (needs OPENAI_API_KEY in ../.env)
cd benchmarks
npx promptfoo@latest eval -c promptfooconfig.gpt.yaml --env-file ../.env --repeat 20 --max-concurrency 1
```