Catching coding agents' invalid commands before they run cut task time by 15.8%

A preprint describes StateMirror, which checks an agent's planned commands against the live repository before they run, catching references to missing files or packages. In 4,398 logged sessions such errors cost a median of three extra steps. On 79 live tasks it cut execution time 15.8% and token use 11.8% without lowering the solve rate.

Photo: Markus Spiske markusspiske / Wikimedia Commons, CC0 (cropped)

Sources

• Research arXiv（査読前） (2026-10-23)
  StateMirror: Pre-Execution Detection of Hallucinated Tool Calls in Coding Agents

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