---
title: "Agent Lightning v1.0: A 3,500-Line Lightweight Agentic RL Framework for Training Agents with Real Harnesses"
type: signal
url: https://frontiernewswire.com/s/agent-lightning-v1-0-a-3-500-line-lightweight-agentic-rl-framework-for-8443a449
published: 2026-10-07T16:00:00.000Z
byline: "Source: MICROSOFT AI"
---

# Agent Lightning v1.0: A 3,500-Line Lightweight Agentic RL Framework for Training Agents with Real Harnesses

Source: MICROSOFT AI · Published 2026-10-07 · Canonical: https://frontiernewswire.com/s/agent-lightning-v1-0-a-3-500-line-lightweight-agentic-rl-framework-for-8443a449

Training AI agents with reinforcement learning can be challenging because their tools, context, and decision-making are managed by complex frameworks. Agent Lightning connects existing agents to RL training, making it easier to improve them without rebuilding them. The post Agent Lightning v1.0: A 3,500-Line Lightweight Agentic RL Framework for Training Agents with Real Harnesses appeared first on Microsoft Research .

In this story: [Microsoft Research](https://frontiernewswire.com/companies/microsoft-research)

## Sources

- [Read the original at MICROSOFT AI](https://www.microsoft.com/en-us/research/blog/agent-lightning-v1-0-a-3500-line-lightweight-agentic-rl-framework-for-training-agents-with-real-harnesses/)

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