Built AI Agent in Python from Scratch - Part 4 - Backend Code

n this video, we continue our Deep Agents series and explore Backends code. You’ll learn how Deep Agents store, read, write, and manage files using different backend options. We cover built-in backends like StateBackend, FilesystemBackend, StoreBackend, and CompositeBackend. You’ll also see how backend routing helps separate temporary agent work from long-term memory or project files. This is an important concept for building agents that can work with files, persist memory, and run safely in real-world applications. By the end, you’ll understand how to choose the right backend for your AI agent in Python.