The paper describes Magentic-One, a multi-agent system designed to perform complex tasks that involve interactions with the web and files. The system consists of a team of specialized agents, each equipped with unique capabilities such as web browsing, file handling, and code execution. These agents are orchestrated by a central agent that plans, tracks progress, and dynamically re-plans to recover from errors. The paper evaluates Magentic-One's performance on several challenging benchmarks and finds it to be competitive with other state-of-the-art systems. The authors also highlight the advantages of the multi-agent approach and discuss potential risks and mitigations for such agentic systems.