# Harness²

- Link: https://100xfounder.com/startup/harness%c2%b2/
- Published: 2026-10-20T12:31:00+05:30
- Author: Ishaan Vardhan

Harness² from Google Research is a plug-and-play recursive agent harnessing framework
that lets LLM agents automatically evolve their execution harnesses (prompts, tools,
memory) for open-world tasks—without ground-truth verifiers. Dual recursion: task-
level Propose-Probe-Compose refinement + harnessing-level accumulation of reusable
experience. Up to +11.5 points on professional benchmarks like WorkBuddy-Bench.