# LangChain gives Managed Deep Agents a browser with handoff for sign-in

> Original title: Browser Use in Managed Deep Agents

- Source: LangChain Blog
- Published: 2026-10-29T04:00:00.000Z
- Bad Influence: https://badinfluence.news/items/nmsvy0jynok0qf092gbneo162
- Original: https://www.langchain.com/blog/browser-use-in-managed-deep-agents

## Summary

LangChain says Managed Deep Agents now lets agents use a browser for tasks such as booking reservations and end-to-end testing. Developers add one define_browser export, and a browser_handoff tool passes control to a person for sign-in. On 100 WebVoyager tasks, LangChain reports a 90% pass rate for $1.98 total, the highest of seven toolsets it tested.

## Why it matters

The post explains where a managed browser helps agents, how sign-in handoff works, and how tool choices were benchmarked, which is useful for teams building web-acting agents.