---
title: "Dependency injection"
manual: "AI Assistant"
version: "main"
source: "Developers/Extending/DependencyInjection.rst"
rendered: "2026-10-03T14:54:45+00:00"
---

# Dependency injection {#dependency-injection}

AI Assistant extension points are registered with TYPO3's service container.
Services are collected by registries through tagged iterators configured in
`Configuration/Services.yaml`.

## Common service tags {#common-service-tags}

```yaml
services:
  Vendor\Extension\Assistant\Pipeline\Processor\MyProcessor:
    tags:
      - name: 'aiassistant.assistant.pipeline.processor'

  Vendor\Extension\Assistant\Prompt\Context\Builder\MyContextBuilder:
    tags:
      - name: 'aiassistant.assistant.prompt.context_builder'

  Vendor\Extension\Indexing\Indexer\MyIndexer:
    tags:
      - name: 'aiassistant.indexing.indexer'

  Vendor\Extension\Indexing\Adapter\MyAdapter:
    tags:
      - name: 'aiassistant.indexing.adapter'

  Vendor\Extension\Indexing\Connector\MyConnector:
    tags:
      - name: 'aiassistant.indexing.connector'

  Vendor\Extension\Connection\Ai\MyAiConnector:
    tags:
      - name: 'aiassistant.connection.ai_connector'

  Vendor\Extension\Connection\VectorStore\MyVectorStoreConnector:
    tags:
      - name: 'aiassistant.connection.vector_store_connector'
```

Avoid manual instantiation for services that depend on constructor injection.
Use the container and registries instead.