RCWT: Measuring Task-Budget Displacement from Coordination Content in LLM Calls

Jul 15, 2026

A new preprint introduces the Roundtable Context Window Test (RCWT), a protocol designed to measure how coordination content—such as shared state and prior discussion—displaces task-relevant tokens in large language model (LLM) prompts under fixed context budgets. The study finds that as coordination overhead increases, model performance drops sharply once the remaining task-relevant evidence falls below a few hundred tokens. An ablation experiment shows this effect is due to budget displacement, not semantic interference from coordination content.

Why it matters: This work provides a practical measurement tool for understanding and managing context allocation in multi-agent and memory-augmented LLM systems, highlighting a key bottleneck when coordination content consumes limited prompt space.

Full story at: arXiv Computation and Language ↗