AutoDesign: Meta-optimizing agent harnesses beats Claude Design on poster generation

dair_ai · x · 2026-08-15

AutoDesign puts the agent harness itself in the optimization loop, using a meta-harness optimizer to guide a code agent in rewriting the harness iteratively. On PosterBench (100 papers across five disciplines), AutoDesign scores 78.32 vs 70.87 for closed-source Claude Design. Dropping the learned DesignHarness into seven other code-agent configurations lifts average from 54.99 to 67.39, showing it learns scaffold knowledge rather than overfitting. One full run executes 253 tool calls and 11 editing turns in 40 minutes for under $3.

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