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2026arXiv

HarnessTTT: Learn to Optimize Harness at Test-Time for Scientific Discovery

Yingzi Ma, Yulong Cao, Nanxi Li et al.

What this work does

Trains a harness proposer at test time while keeping the executor fixed; generated prompts, skills and execution controls guide budgeted discovery rollouts whose feedback updates proposer weights.

Connection to discovery

A direct test-time learning mechanism for improving the procedure used to search for discoveries.

Evidence

The body separates executor-weight, context-only and proposer-weight adaptation, specifies RLOO/max-sharpening, and compares best valid solutions across computational discovery tasks.

Scope and limitations

Proposer training and evaluator access must be included in cost; the executor remains frozen, and improved verifier scores require independent solution-validity checks.

THE RESEARCH CONVERSATION

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