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Harness² drives JEV 1.14: frozen weights, self-evolving prompts, tools and lessons

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Google Research Harness² wraps JEV 1.14 in a runtime evolution loop: prompts, tools and lessons are rewritten from trajectories while weights stay frozen. On screen, detection confidence climbs from 0.63 to 0.96 and fallbacks fall from 6/20 to 1/20 across three rounds.

Agent HarnessRecursive self-improvementJevGoogle ResearchObject Detection
Category: harness
Author: @openmys
Date: 2026-10-19T00:00:00
Duration: 22.366s
Source: https://x.com/openmys/status/2112024812751294954
Reference: https://github.com/google-research/harness2

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