Agentic RAG Evaluation: Budget Allocation Across Questions, Trajectories, and Reads
Agentic RAG evaluation budgets favor broader question coverage over repeated reads or trajectories, reducing standard error by up to 33% at fixed token cost.
Published Oct 4, 2026▲ 14 on Hugging FacearXiv ↗
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Abstract
Evaluation budgets in agentic retrieval-augmented generation span questions, search trajectories, and repeated answers. We measure allocation precision, reading efficiency, and cost boundaries using a retrieval-feedback comparison on HotpotQA and MuSiQue. At 34.14--34.39M model tokens, broader question coverage lowers standard error by 33\% versus five reads and 12.6\% versus three trajectories. Archived nested and Q-only forecasts predict these allocations within 4.0\% and 3.5\%, respectively. Depth subsets establish no clear forecasting advantage beyond the two-trajectory audit. One-read variance penalties relative to the fitted optimum at the same token budget are 0--9.9\%, with substantial Pro uncertainty. Under recorded model fees, more questions beat more trajectories at search prices of \$0--1 per 1,000 requests; question-versus-read fee rankings remain unresolved. Temperature zero cuts answer disagreement from 14.3\% to 3.4\% while comparison precision stays similar. \par\medskip\noindent\textbf{Keywords:} Agentic RAG; Evaluation budget; Generalizability theory; Repeated sampling.