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Can LLMs Engineer Their Own Agent Harness? ByteDance Seed’s HarnessDev Says Only 34 of 64 Changes Generalize

This story is from 2026-09-11. It is preserved in the archive; the latest stories are on the live feed.

Most agent benchmarks freeze the harness and grade the model inside it. That hides the part of the system doing much of the work, and ByteDance Seed just built a benchmark that grades the harness itself. They introduced HarnessDev, with SUTD, Georgia Tech, M-A-P, and TokenWave.AI: a 2-stage benchma…

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  1. 2026-09-11 22:09 · r/machinelearningnews
    Can LLMs Engineer Their Own Agent Harness? ByteDance Seed’s HarnessDev Says Only 34 of 64 Changes Generalize

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