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

# Overview

> How authentication works in Caylex at the platform and server levels.

Caylex has two distinct layers of authentication. Knowing which is which tells you what credential to use and who it is for.

| Layer                                                        | Who it is for                                | What it controls                                                                                                                                                                  |
| ------------------------------------------------------------ | -------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **[Server authentication](/auth/server-authentication)**     | Your end users                               | How users authenticate with external MCP servers like GitHub, Slack, or Linear so your agents can act on their behalf                                                             |
| **[Platform authentication](/auth/platform-authentication)** | You and your tools (developers, scripts, CI) | Access to the Caylex platform itself: managing projects, servers, navigators, skills, and analytics, through the Caylex Platform UI (SSO) or the REST API (platform access token) |

These layers are independent. Logging into Caylex (platform authentication) does not grant access to any external MCP server; that is governed separately by server authentication.

## Get started

<CardGroup cols={2}>
  <Card title="Sign up" icon="user-plus" href="https://app.caylex.ai/signup/">
    Create a Caylex account to manage your workspace.
  </Card>

  <Card title="Sign in" icon="arrow-right-to-bracket" href="https://app.caylex.ai/signin/">
    Log in to your Caylex workspace.
  </Card>
</CardGroup>

## Choose your path

<CardGroup cols={2}>
  <Card title="Server Authentication" icon="lock" href="/auth/server-authentication">
    Set up how your end users authenticate with external MCP servers, at the user or project level.
  </Card>

  <Card title="Platform Authentication" icon="key" href="/auth/platform-authentication">
    Access the platform through the Caylex Platform UI (SSO) or programmatically with a platform access token.
  </Card>
</CardGroup>