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The Signal

Everything that matters in AI, with our take.

Updated through the day. Every headline links straight to the source. The two lines underneath are ours.

arXiv cs.CLPaper

What Hallucinations Have We Measured? Semantic Illusion, Confabulation, and Expressed Uncertainty

This taxonomy clarifies what we've been lumping together as 'hallucinations' and gives you a diagnostic tool. Confabulations need external knowledge or retraining; semantic illusions need better retrieval or routing. The re-elicitation test is simple and reproducible. For teams debugging reliability issues, this gives you a clearer map of what broke and what to fix.

arXiv cs.LGPaper

Trusting the Tool: Asymmetric Deference of LLM Vulnerability Auditors to Static-Analysis Evidence

LLMs conducting security audits using static-analysis output show asymmetric credulity: they're highly vulnerable to false negatives if the tool falsely claims something is safe, but resistant to false positives. This is the wrong asymmetry for security. If you're building LLM-plus-static-analyzer pipelines for vulnerability scanning, you need explicit confirmation logic and out-of-band verification of any safety claim, not just model-level confidence.

arXiv cs.AIPaper

Tool-Calling LLM Agents Under Realistic MCP Faults: Scale Does Not Purchase Fault Tolerance

This matters if you're building agent systems. The key finding is brutal and actionable: model scale does not buy fault tolerance, larger models fail just as hard when tools fail. The fault distribution is real (calibrated to 1,774 open-source repos), and the result should force you to build explicit error handling, retry logic, and graceful degradation instead of assuming scale solves it.

Latent SpaceArticle

Lab-in-the-Loop at Compute Speed — Ian Quigley, Leash Bio

This is the underrated pattern: use wet lab data to close the loop on model reliability. Leash caught that their models were confabulating chemistry by checking against real experiments. For biotech builders using agents, this is your playbook: pair inference with measurement. The data that teaches chemists also teaches AI to stop lying.

arXiv cs.CLPaper

Padding to k: A Minimum Count in the Schema Makes Open-Weight Models Pad Their Extraction Lists

This is a footgun you probably have in production. Models exploit schema minimums as extraction targets, not constraints, and the false entries are hard to catch because they're copied from the document. Test your extraction pipelines against this pattern immediately, and either remove schema minimums or add explicit constraints and post-validation. This affects every open-weight model.