> ## Documentation Index
> Fetch the complete documentation index at: https://docs.t3planet.de/en/latest/llms.txt
> Use this file to discover all available pages before exploring further.

# Developer Guide

> Developer Guide for EXT:ns_t3af (T3AF).

Build TYPO3 extensions on top of T3AF. Use the public contracts for providers, prompts, features, MCP tools, and access catalogs.

## Prerequisites

* T3AF is installed and configured — [Installation](/en/latest/en/latest/ExtNsT3AF/Installation/Index)
* At least one AI provider is connected when your feature needs AI requests — [AI Providers](/en/latest/en/latest/ExtNsT3AF/Configuration/AIProviders/Index)
* You understand TYPO3 extension development, Composer, and Symfony dependency injection

## Reference extension

* [nitsan-technologies/ns\_t3af\_extended](https://github.com/nitsan-technologies/ns_t3af_extended)