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Current retry strategies treat both cases identically (try again and hope for the best), leaving human supervisors unable to tell whether a retry was warranted or whether the system should have halted instead.\n  We introduce the Argent Signaling Protocol (ASP), a compact machine-readable header that accompanies every AI-generated response with structured quality signals: certainty (@C), grounding (@G), stochasticity (@S), and an assumption index that classifies the evidentiary basis of each claim. These signals enable a controller to distinguish repairable failures from containment failures and route each case differently.\n  We evaluate ASP in two modes. In standalone mode, a 27-question document-grounded QA benchmark over the Array BioPha","title":"Trustworthy Multi-Agent Systems: Mitigating Semantic Drift with the Argent Signaling Protocol","url":"https://arxiv.org/abs/2606.19356","vendor":"arxiv_cs_ai"},"summary":"arXiv:2606.19356v1 Announce Type: cross \nAbstract: When multi-agent LLM systems produce bad answers, not all failures are equal: some answers are grounded in the right material but incomplete, while others are simply ungrounded and should be stopped. Current retry strategies treat both cases identically (try again and hope for the best), leaving human supervisors unable to tell whether a retry was warranted or whether the system should have halted instead.\n  We introduce the Argent Signaling Protocol (ASP), a compact machine-readable header that accompanies every AI-generated response with structured quality signals: certainty (@C), grounding (@G), stochasticity (@S), and an assumption index that classifies the evidentiary basis of each claim. These signals enable a controller to distinguish repairable failures from containment failures and route each case differently.\n  We evaluate ASP in two modes. 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