An agent harness for building autonomous AI agents that plan complex multi-step tasks, manage their own filesystem, and spawn specialized subagents for long-horizon work.
Deep Agents is an open-source agent harness built on LangChain and powered by the LangGraph runtime for durable execution, streaming, and human-in-the-loop workflows. It addresses the gap where standard LLM agents break down on multi-step, stateful, and artifact-heavy tasks by providing a structured runtime with built-in planning, context isolation, and delegation. The framework includes a write_todos planning tool, a virtual filesystem backend with multiple storage options, and a subagent delegation system enabling a primary agent to spawn specialized subagents with isolated context.
Multi-step autonomous research with structured report generation
Multi-tier customer support triage with specialized subagents
Automated software testing and deployment pipeline management
Personal productivity automation with persistent memory
Reduced manual effort on complex multi-step tasks
Improved task completion rates through structured planning and context isolation
Increased developer productivity through reusable subagent patterns
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