ResearchResearch paperSafety & Alignment · Evaluation & Benchmarks · Agents & Tool Use1 source · Oct 7, 2026

Cross-Provider Review as a Runtime Contract for Coding Agents: A Controlled Pilot and Fault-Injection Study

We describe an advisory cross-provider review contract: distinct resource pools, bounded execution, restricted reviewer capabilities, complete input delivery, usable semantic output, explicit failure states and durable per-attempt evidence.

Key points

  • Coding agents increasingly share a workstation while drawing on separate providers and subscription allowances.
  • A second agent can inspect a completed answer, but the call spends another pool and may provide no substantive finding.
  • A boundary-condition scan across both reviewer backends reproduced a previously discovered false success on partial input: four truncation levels passed historically and failed after repair.
  • A preregistered shadow study of metadata-only review allocation accrued 25 formal observations before an exact-runtime regression found a third defect: a reviewer exiting nonzero with a well-formed verdict was counted as complete.

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