Deep Agents, a Python package designed for creating autonomous agents capable of handling complex tasks over extended periods, has released its 0.2 version with significant enhancements, including pluggable backends that allow developers to configure custom filesystems beyond the previous virtual filesystem. This update supports various backend implementations, such as using the local filesystem or creating composite backends to extend functionality, like integrating an S3-backed virtual filesystem for long-term memory. The new release also introduces features like large tool result eviction, conversation history summarization, and dangling tool call repair, enhancing the package's efficiency and reliability. Deep Agents is positioned as an "agent harness" that complements LangChain and LangGraph by offering built-in tools and capabilities for developing autonomous agents, building upon LangChain's "agent framework" and LangGraph's "agent runtime."