> ## 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 tap phylaxsystems/pcl
brew install phylax
```

This will install the `pcl` binary.

### Option 2: Install with Cargo

Another convenient way to install `pcl` is using Cargo. It does require a couple of pre-requisites though:

* **Rust Stable** (version 1.81 or later) or **Rust Nightly** (version 1.80 or later)
* **Git**

```bash theme={null}
cargo +nightly install --git https://github.com/phylaxsystems/credible-sdk --locked pcl
```

<Note>
  If above command fails, try updating Rust with `rustup update` and try again.
</Note>

This will install the `pcl` binary in your Cargo installation directory (typically `~/.cargo/bin` on Unix-like systems). Make sure this directory is in your PATH.

### Option 3: Build from Source

This option is recommended if you want more control over the build process or prefer to build from source.

Prerequisites:

* **Rust Stable** (version 1.81 or later) or **Rust Nightly** (version 1.80 or later)
* **Git**

1. Clone the repository:
   ```bash theme={null}
   git clone https://github.com/phylaxsystems/credible-sdk
   cd credible-sdk
   ```

2. Build the CLI:
   ```bash theme={null}
   cargo build --release --bin pcl
   ```

<Note>
  If above command fails, try updating Rust with `rustup update` and try again.
</Note>

3. The compiled binary will be available in the `target/release` directory.

4. (Optional) Add the binary to your PATH for easier access:

   ```bash theme={null}
   # System-wide installation (requires admin privileges)
   cp target/release/pcl /usr/local/bin/

   # Or for a user-local installation
   cp target/release/pcl ~/.local/bin/
   ```

   You can place the binary in any directory that's in your PATH. Choose a location that works best for your system configuration.

   Alternatively, you can create an alias in your shell configuration file (like `.bashrc`, `.zshrc`, etc.) that points to the absolute path of the binary:

   ```bash theme={null}
   # Add to your shell config file
   alias pcl="/path/to/pcl/target/release/pcl"
   ```

## 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.