ResearchResearch paperLarge Language Models · Reinforcement Learning · Agents & Tool Use1 source · Oct 14, 2026

AtomSearch: Evidence-Grounded Tree Search for Agent Skill Optimization

We introduce AtomSearch, which keeps revision actions local while using subsequent skill states to guide search.

Key points

  • Agent skills adapt frozen models through editable external instructions.
  • Contrastive atomic editing links each primitive rule edit to failed and successful executions, a behavioral hypothesis, and an intended scope.
  • Skill-State Tree Search (STS) evaluates short edit compositions and selectively retains them as executable states that can be revisited and extended.
  • Outcome memory supplies later proposals with observed repair and regression statistics.

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