GraphEcho (arXiv:2609.17695v1) probes redundancy and provenance in LLM graph agents
GraphEcho is a benchmark that varies path counts and evidence origins while holding evidence content fixed to test whether LLM graph agents treat repeated encounters as additional corroboration. Controlled synthetic experiments show model-dependent judgment shifts and universal increases in repeated walks; provenance-aware post-training (PAPT) reduces revisits and improves synthetic accuracy but covers fewer distinct sources and, on scientific claims, reduces repetition while accuracy falls.