# AI agent architecture

> The building blocks of production agent systems: RAG, tool use, multi-agent, memory, MCP, human-in-the-loop, guardrails, evals and observability.

Canonical URL: https://www.ruebstudio.de/en/guides/ai-agent-architecture

## Fundamentals

- [Enterprise RAG: Architecture, Building Blocks and Pitfalls](https://www.ruebstudio.de/en/guides/ai-agent-architecture/enterprise-rag-architecture.md): Enterprise RAG architecture explained: ingestion, chunking, hybrid search, permissions, evaluation and operations, plus which variant fits which situation.