Harness engineering: leveraging Codex in an agent-first world
By Ryan Lopopolo, Member of the Technical Staff
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Summary
Cursor built a multi-agent harness that orchestrates thousands of AI coding agents to produce a working web browser over a continuous one-week run.
The final system uses a hierarchical structure of root planners, recursive subplanners, and isolated workers that hand off completed tasks upward. Cursor is making a portion of this harness available as a preview to some users.
