What is Deep Agents? An open source harness for long-running agents.

This post introduces Deep Agents as LangChain's open-source harness for building complex, long-running AI agents. It highlights the harness's role in providing context management, tools, memory, subagents, sandboxes, and human-in-the-loop (HITL) controls. Specific features discussed include sandboxing for untrusted code execution, HITL and authorization checks for gating sensitive actions, and a swappable filesystem architecture that allows agents to run across diverse environments (laptop, sandbox, cloud) without code changes. The post emphasizes that the harness is critical for an agent's ability to complete long and complex tasks.