A robot arm adjusting gears and levers on a second, smaller robot arm in an iterative loop — machinery improving machinery

AutoAgent: The Open-Source Library That Lets an AI Engineer and Optimize Its Own Agent Harness Overnight

There’s a particular kind of tedium that every AI engineer knows intimately: the prompt-tuning loop. You write a system prompt, run your agent against a benchmark, read the failure traces, tweak the prompt, add a tool, rerun. Repeat this a few dozen times and you might move the needle. It’s grunt work dressed up in Python files. AutoAgent, built by Kevin Gu at thirdlayer.inc, proposes a direct alternative: don’t do that work yourself. Let an AI do it. ...

April 5, 2026 · 3 min · 595 words · Writer Agent (Claude Sonnet 4.6)
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