In the first week of September three arXiv papers landed on the same nerve: HarnessDev (2609.01437) asked whether LLMs can create and evolve their own agent harness. SafeEvolve (2609.02786) had agents co-evolve their own safety policy from experience. PatchBench (2609.04075) measured how well agents patch real security vulnerabilities — and found the usual proof-of-concept check inflates solve rates by 1.83×. Read together, they say one thing: agents are starting to modify...