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arXiv — cs.AI

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ContractRL: Shielded Group-Relative Policy Optimization for Auditable Tool-Call Repair

Structured tool calls often fail after only a small number of fields violate a schema or an execution contract. Regenerating the complete object enlarges the action surface and makes repeated repair difficult to audit. We introduce ContractRL, a contract-constrained sequential…

arXiv — cs.AIBy: Miaobo Hu, Shuhao Hu, Xiaobo Guo, Xin Wang, Bokun Wang, Yina Sa, Daren Zha, Jun XiaoOctober 2, 2026 (Oct 2)
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AI Summary & Key Takeaways

  • Structured tool calls often fail after only a small number of fields violate a schema or an execution contract
  • Regenerating the complete object enlarges the action surface and makes repeated repair difficult to audit
  • We introduce ContractRL, a contract-constrained sequential…
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ContractRL: Shielded Group-Relative Policy Optimization for Auditable Tool-Call Repair

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