> ## Documentation Index
> Fetch the complete documentation index at: https://docs.halliday.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# AI Plugins and LLMs.txt

## Halliday Claude Code Plugin

For users developing with [Claude Code](https://claude.com/product/claude-code), Halliday now has an official plugin available to automate tedious tasks of development.

The `/halliday` command with a guided menu of flows:

* **Ask questions and learn** — Answers backed by a bundled reference library of the official documentation pages, SDKs, and live Halliday API lookups.
* **Clone a sample application** — Pick from several example open source repos and walk through setup end-to-end.
* **Check my integration** — Scan your codebase against an integration checklist and flag only the items that could cause issues with the Halliday integration.
* **Look up a payment** — Fetch a payment by ID, show a clear status summary with explanation, and give status-specific next steps.

The Halliday Claude Code plugin is now available in the [Anthropic community marketplace](https://github.com/anthropics/claude-plugins-community). After installing Claude Code on the command line, add the plugin using the Anthropic community marketplace:

```
## official community marketplace
claude plugin marketplace add anthropics/claude-plugins-community

## OR from our marketplace, version updated more frequently
claude plugin marketplace add halliday

claude plugin install halliday-payments
```

If already installed, update the plugin with this command:

```
## From a shell
claude plugin update halliday-payments@claude-community
## OR
claude plugin update halliday-payments@halliday

## From within the Claude Code CLI
/plugin update halliday-payments@claude-community
## OR
/plugin update halliday-payments@halliday
```

To work on a personalized fork, the plugin can be utilized in development mode using git and these commands:

```
git clone https://github.com/HallidayInc/HallidayClaudePlugin.git
claude --plugin-dir ./HallidayClaudePlugin

## Once in Claude Code, use this command to open the Halliday Claude Code plugin:
/halliday
```

The Halliday Claude Code plugin is [open source on GitHub](https://github.com/HallidayInc/HallidayClaudePlugin/).

## Halliday Codex Plugin

For users developing with [Codex](https://openai.com/codex/), Halliday also has an official plugin available to automate tedious tasks of development.

The `halliday` skill with a guided menu of flows:

* **Ask questions and learn** — Answers backed by a bundled reference library of the official documentation pages, SDKs, and live Halliday API lookups.
* **Clone a sample application** — Pick from several example open source repos and walk through setup end-to-end.
* **Check my integration** — Scan your codebase against an integration checklist and flag only the items that could cause issues with the Halliday integration.
* **Look up a payment** — Fetch a payment by ID, show a clear status summary with explanation, and give status-specific next steps.

The Halliday Codex plugin repository is itself a Codex plugin marketplace, so no clone is needed. After installing Codex on the command line, add the marketplace and install the plugin:

```
codex plugin marketplace add HallidayInc/HallidayCodexPlugin
codex plugin add halliday-payments@halliday
```

Start a new `codex` session to pick up the skill, then invoke it with `$halliday` or just ask a Halliday question:

```
## Once in Codex, use this command to open the Halliday Codex plugin:
$halliday
```

To update to the latest version, run these commands and then start a new session:

```
codex plugin marketplace upgrade
codex plugin add halliday-payments@halliday
```

The Halliday Codex plugin is [open source on GitHub](https://github.com/HallidayInc/HallidayCodexPlugin/).

## Export of the Documentation for LLMs

The llms.txt of the documentation can be crawled from here:
[https://docs.halliday.xyz/llms.txt](https://docs.halliday.xyz/llms.txt)

Additionally, a full export of all docs pages as markdown can be found here: [https://docs.halliday.xyz/llms-full.txt](https://docs.halliday.xyz/llms-full.txt)

The API specification `openapi.json` is here: [https://v2.prod.halliday.xyz/api](https://v2.prod.halliday.xyz/api).