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AutoSaddler: Automatic Harness Optimization with Durable Updates from Agent Execution Traces

Research LLM Agents

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Merged summary

TL;DR - AutoSaddler is an offline-learning framework that automatically improves LLM-agent harnesses using failure traces, structured patches, and validation-based update selection. It raises performance by 9.0–10.0 percentage points across three long-horizon agent benchmarks.

  • Diagnoses failures from execution traces and treats harness modifications as structured code patches.
  • Iteratively learns from mini-batches of failures rather than relying on manual prompt, tool, and control-logic tuning.
  • Improves base harnesses by 9.0 points on GAIA2, 9.6 on SWE-Bench Pro, and 10.0 on Terminal-Bench 2.0.
  • Ablations favor deep debugging, targeted edits, and generalization-aware validation over shallow reflection or trajectory-specific repairs.

Sources (1)

AutoSaddler: Automatic Harness Optimization with Durable Updates from Agent Execution Traces

arXiv cs.AI Sungho Park, Wonjoong Kim, Rongyuan Tan, Jue Zhang, Wook-Shin Han, Pengfei Gao, Chanyoung Park, Yongqiang Yao, Rao Fu, Elsie Nallipogu, Qingwei Lin, Saravan Rajmohan, Dongmei Zhang 2026-08-24 arXiv:2608.23041
Public signals Hugging Face upvotes 64
Providers: Hugging Face · Upvotes 64 OpenAlex · N/A Publisher · N/A Semantic Scholar · N/A X · N/A Fetched 2026-09-24 14:34:15.811903 UTC

TL;DR - AutoSaddler is an offline-learning framework that automatically improves LLM-agent harnesses using failure traces, structured patches, and validation-based update selection. It raises performance by 9.0–10.0 percentage points across three long-horizon agent benchmarks.

  • Diagnoses failures from execution traces and treats harness modifications as structured code patches.
  • Iteratively learns from mini-batches of failures rather than relying on manual prompt, tool, and control-logic tuning.
  • Improves base harnesses by 9.0 points on GAIA2, 9.6 on SWE-Bench Pro, and 10.0 on Terminal-Bench 2.0.
  • Ablations favor deep debugging, targeted edits, and generalization-aware validation over shallow reflection or trajectory-specific repairs.
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