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What Does a Skill Actually Do? Estimands and Evaluation Validity for Tool and Skill Use in LLM Agents: A Critical Review
Large language model (LLM) agents increasingly draw on external tools and reusable skills selected at run time from libraries that hold thousands of entries. Reports that a retriever, router, or skill library "improves" an agent may refer to retrieval recall, the success change from enabling a libra
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