ResearchResearch paperAgents & Tool Use · Efficiency & Inference2 sources · Oct 20, 2026

Harness Self-Evolution for Long-Horizon Terminal Agents

Long-horizon terminal agents may solve a task in one run yet fail across repeated runs.

Key points

  • Stochastic errors can propagate through actions and context, creating a gap between capability and reliable execution.
  • We present RiseHarness, a framework for iteratively improving agent harnesses with model weights fixed.
  • RiseHarness combines agent trajectories with internal harness traces from a runtime monitor to examine how model actions interact with command execution, feedback, context management, and completion decisions.
  • A Harness Handbook links this evidence to harness behaviors and source code, helping identify recurring problems in mechanisms shared across tasks.

Sources (2)

Extractive summary: sentences quoted from the sources.

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