# Same Simulation, Different Evidence: Where Retrieved Tool Output Costs LLM Agents Accuracy

> Source: <https://aiflash.com/news/137768/>
> Published: 2026-10-23 00:00:14+00:00

LLM agents that compute the right answer can still answer wrongly. Agent harnesses increasingly keep long tool outputs out of the context window, saving them to files that the agent searches or reads on demand. We ask where this costs accuracy with a real scientific tool: PHREEQC, a widely used geoc