# Customize Progress Agentic RAG indexing

## Overview

> info **PREREQUISITES**: This feature is available as of Sitefinity CMS product update 15.4.8633.

By default, the Progress® Agentic RAG connector builds the resource data sent to the Progress Agentic RAG knowledge box using the `AgenticRAGResourceDataBuilder` class. You can replace this with a custom implementation to control what indexing data is sent for each content item — for example, to modify the resource title, add custom metadata, or transform field values before they reach the knowledge box.

## Create a custom resource data builder

To customize indexing, create a class that extends `AgenticRAGResourceDataBuilder` and overrides the `Build` method:

```C#
using Progress.Sitefinity.AgenticRAGConnector.Clients.Models;
using Progress.Sitefinity.AgenticRAGConnector.Publishing;
using System.Collections.Generic;
using Telerik.Sitefinity.Publishing;
using Telerik.Sitefinity.Publishing.PublishingPoints;

public class CustomAgenticRAGResourceDataBuilder : AgenticRAGResourceDataBuilder
{
    /// <inheritdoc />
    public override AgenticRAGIndexingResourceData Build(WrapperObject wrapperObject, string itemSlug, IEnumerable<SearchIndexAdditionalField> additionalFields)
    {
        // Call the base implementation to get the default indexing data.
        var indexingResourceData = base.Build(wrapperObject, itemSlug, additionalFields);

        // Customize the resource request before it is sent to the Agentic RAG service.
        // For example, override the resource title in RAG.
        var title = wrapperObject.GetPropertyOrDefault<string>(PublishingConstants.FieldTitle);
        if (!string.IsNullOrEmpty(title))
        {
            indexingResourceData.Request.Title = $"{title}-{itemSlug}";
        }

        return indexingResourceData;
    }
}
```

## Register the custom builder

Register the custom implementation in `Global.asax` by subscribing to the `Bootstrapper.Bootstrapped` event and using `ObjectFactory` to replace the default type:

```C#
using System;
using Telerik.Microsoft.Practices.Unity;
using Telerik.Sitefinity.Abstractions;
using Telerik.Sitefinity.AgenticRAG.Indexing;

public class Global : System.Web.HttpApplication
{
    protected void Application_Start(object sender, EventArgs e)
    {
        Bootstrapper.Bootstrapped += Bootstrapper_Bootstrapped;
    }

    private void Bootstrapper_Bootstrapped(object sender, EventArgs e)
    {
        ObjectFactory.Container.RegisterType<IAgenticRAGResourceDataBuilder, CustomAgenticRAGResourceDataBuilder>(
            new ContainerControlledLifetimeManager());
    }
}
```

After registering the custom builder, Sitefinity uses it for all subsequent indexing operations sent to the Progress Agentic RAG knowledge box.