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Lagent

Lagent

Open-source Python framework for LLM-based agents

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What this product helps you do

Lagent gives developers a code-first way to assemble agent workflows around model backends, tools, structured messages, and session memory. Official examples cover ReAct and ReWOO agents, function tools, web demos, local model runtimes, and hosted model APIs.

Problems it solves

  • Agent workflows need reusable message and memory abstractions
  • Developers need to connect tools to several model backends
  • Multi-agent message passing becomes difficult to inspect
  • Prototype agents need a path from examples to custom Python code
Best for
AI developersAgent researchersPython teamsOpen-source contributors

Lagent is a lightweight open-source framework for building LLM-based agents in Python. Its PyTorch-inspired structure treats agents as layers and uses structured AgentMessage objects for communication, memory, aggregation, and inspection.

The project includes agent patterns such as ReAct and ReWOO, tool and action interfaces, model wrappers, memory handling, quickstarts, web demos, and an API reference. It can connect to local inference runtimes or model APIs, so operating costs and deployment requirements depend on the selected backend.

Information

DeveloperInternLM
Languagesen
Pricing modelfree
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