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

# Agents Overview

Agents are automated models that run on your data within Encord — pre-labeling assets, reviewing annotations, or performing custom actions.

## Agent Catalog

The **Agents Catalog** is the central place to discover, configure, and deploy agents in Encord — from off-the-shelf integrations to fully [Custom Agents](/platform-documentation/Annotate/automated-labeling/annotate-custom-agents).

<div class="flex justify-center">
  <img src="https://storage.googleapis.com/docs-media.encord.com/static/img/agents-catalog-new.png" />
</div>

## Agent Types

* **Catalog agents**: Built-in agents that you configure in a few simple steps (for example, OpenAI or Google Document AI). See [available Agents](/platform-documentation/Annotate/automated-labeling/annotate-agents-catalog-reference) for a full list.
* **Custom agents**: Configured using the **Agents Catalog**. See [Custom Agents](/platform-documentation/Annotate/automated-labeling/annotate-custom-agents) for details.

## Enable Agents

1. Navigate to **Agents** in the left-hand navigation. The **Agents catalog** tab opens by default.
2. Browse or search for agents:
   * Built-in agents are shown as tiles you can configure with API keys and simple options.
   * The **Custom agent** tile lets you register your own HTTPS endpoint as an agent.
   * A **Request agent** tile lets you ask Encord to add a new integration.
3. Click **Add** to enable an agent.
4. Give the Agent a meaningful name.
5. Add [Ontology and label target](/platform-documentation/Annotate/automated-labeling/annotate-agents-overview#ontology-%26-label-targets) information, and any [required external credentials](#external-credentials) if necessary.
6. Click **Add agent** to save the configuration and enable the agent for use in your Projects.

<div class="flex justify-center">
  <img src="https://storage.googleapis.com/docs-media.encord.com/static/img/add-agent-2.png" />
</div>

### External Credentials

Many catalog agents require **external credentials**, such as OpenAI API keys or Google service accounts.

You can add and manage these credentials in two ways:

* **While creating an agent**: When you configure a catalog agent, you can choose or create the required external credential directly in the form.
* **From workspace settings**: Go to **Workspace settings** > **External credentials** to create, reuse, or revoke credentials across agents.

Once configured, credentials can be reused by multiple agents without re-entering secrets.

### Ontology & Label Targets

* **Ontology** - The Ontology the Agent uses.
* **Label Targets** - The specific classes within the Ontology that the Agent writes its output to. Only classes that the Agent template supports as outputs are available for selection.

<Info>
  The Agent can only be attached to projects that use the same Ontology. When creating an Agent directly from a Workflow stage, the Project's Ontology is pre-filled automatically.
</Info>