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

# Installation

> This page explains how to install the Phylax Credible Layer (`pcl`) CLI tool

`pcl` is the command-line tool for building, testing, storing, and submitting assertions to the Phylax Credible Layer.

## Installation

### Option 1: Install with Brew (Recommended)

The fastest and easiest way to install `pcl` is using Brew:

```bash theme={null}
brew install phylax/pcl/phylax
```

This will install the `pcl` binary.

## Verifying Installation

To verify that `pcl` is installed correctly, run:

```bash theme={null}
pcl --version
```

You should see the version number of the installed `pcl` CLI.

## Installing the `credible-std` Library

If you're looking to add the `credible-std` library to your existing project for writing assertions, see the [credible-std Library Overview](/credible/credible-std-overview) for the package name, stable dependency, and remapping reference.

## Next Steps

Now that you have `pcl` installed, you can learn how to [get started](/credible/pcl-quickstart) with the Credible Layer.