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

# Installation

> Install the C# Agent SDK and its core client dependency.

## Install

```bash theme={null}
dotnet add package Phaseo.Sdk
dotnet add package Phaseo.AgentSdk
```

## Environment

Set your gateway API key before running examples:

```bash theme={null}
set PHASEO_API_KEY=phaseo_v1_sk_...
```

## Next

* [Overview](./agent-sdk-overview.mdx)
* [Usage](./agent-sdk.mdx)