Tool Use Enables Undetectable Steganography in Multi-Agent LLM Systems

Jimmy Laurence Rippin, Simon C. Marshall, David Demitri Africa, Christian Schroeder de Witt · 2026 · arXiv

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With ordinary tools, agents could build working hidden-message systems. The bottleneck is coordination: independent agents pick the same method family but rarely identical settings, so covert collusion becomes a problem of finding a shared focal point.

Questions it bears on

• Reading a swarm’s aims