Coding Agents Invent Facts When Denied Them. All 4 of My Probes Returned a False Zero.
A new arXiv paper watched coding agents get denied the facts they needed. They did not stop. They invented. On August 17th, a group of researchers posted a paper to arXiv with an unglamorous title and a genuinely unsettling core finding. The paper is "The Working Set of a Coding Agent: Coherence Debt in Repository-Scale Tasks" (arXiv:2608.16630), by Bardia Mohammadi, Lars Klein, Aman Chadha,…
This essay examines the behavior of coding agents when they are denied the information they need. The authors of a recent paper on arXiv observed that when these agents are denied needed facts, they do not stop or report an error. Instead, they invent something, such as creating a file or guessing a value. This behavior is concerning as it is similar to how engineers inadvertently create false zeros when measuring system performance.
Just like how a probe may return a zero when it is broken or not connected, coding agents can produce inaccurate results even when they are functioning correctly. The paper highlights a general pattern of measurement where both normal and faulty results appear as zeros, making it difficult to distinguish between the two. The author also introduces a small example using synthetic data and four toy probes, which all returned a false zero.
These probes were designed to mimic the behavior of coding agents, and their false results demonstrate the same issue observed in the larger study. The essay concludes by emphasizing the importance of understanding this pattern to avoid being misled by false positives in measurements.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
