Agents SDK: Streamlining Autonomous Agent Infrastructure

The harness will continue to incorporate new agentic patterns and primitives over time, so developers can spend less time on core infrastructure updates and more time on the domain-specific logic that makes their agents useful. The harness also helps developers unlock more of a frontier model's capability by aligning execution with the way those models perform best. That keeps agents closer to the model's natural operating pattern, improving reliability and performance on complex tasks--particularly when work is long-running or coordinated across a diverse set of tools and systems.

In addition, we realize each product is unique and rarely fits neatly into a mold. We designed Agents SDK to support this diversity. Developers get a harness that's turnkey yet flexible--making it easy to adapt it to their own stack--including tool use, memory, and sandbox environment.

The updated Agents SDK supports sandbox execution natively, so agents can run in controlled computer environments with the files, tools, and dependencies they need for a task. Many useful agents need a workspace where they can read and write files, install dependencies, run code, and use tools safely. Native sandbox support gives developers that execution layer out of the box, instead of forcing them to piece it together themselves.

Developers can bring their own sandbox or use built-in support for Blaxel, Cloudflare, Daytona, E2B, Modal, Runloop, and Vercel. To make those environments portable across providers, the SDK also introduces a Manifest abstraction for describing the agent's workspace.