ResearchResearch paperSafety & Alignment · Large Language Models · Evaluation & Benchmarks1 source · Oct 14, 2026

What Coding Agents Leave Unsaid: Measuring Task-State Gaps Between Execution and Reports

We conduct CTXGAP, a measurement study quantifying the gap in task-state recoverability between agents' accumulated user-facing reports and their full recorded execution contexts.

Key points

  • Human supervisors rely on coding agents' reports to assess progress, verify repairs, and decide when to intervene.
  • Across 37 coding tasks and 4,799 valid probes, agents answer 93.6% of task-state questions on demand; full-context readers recover 92.7%, while report-only readers recover 52.0%, a 40.7-point gap.
  • Human annotation identifies states mentioned without enough supporting detail as the largest category of unrecovered information, and model-assessed supervision-relevant states retain substantial gaps.
  • Positive gaps persist across harnesses and independent DeepSeek execution and measurement.

Sources (1)

  • [1]What Coding Agents Leave Unsaid: Measuring Task-State Gaps Between Execution and Reports
    arXiv (AI, ML, NLP, CV, robotics, multi-agent) · Oct 14, 11:20 AM
    We conduct CTXGAP, a measurement study quantifying the gap in task-state recoverability between agents' accumulated user-facing reports and their full recorded execution contexts.
    Human supervisors rely on coding agents' reports to assess progress, verify repairs, and decide when to intervene.

Extractive summary: sentences quoted from the sources.

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