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…

Miaobo Hu, Shuhao Hu, Xiaobo Guo, Xin Wang, Bokun Wang, Yina Sa, Daren Zha, Jun Xiao·arXiv — cs.AI

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Key Takeaways

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

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