Zuyao Xu
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Agent Transfer Protocol: Server-Mediated Authentication and Messaging for Agent-to-Agent Communication

Xiang Li, Yuqi Qiu, Zuyao Xu, Lu Sun, Fasheng Miao, Fubin Wu, Haixin Duan, Zheli Liu

Stable agent addresses, offline delivery, and independently verifiable cross-domain messages.

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arXiv · 2026Agent Transfer Protocol: Server-Mediated Agent-to-Agent Communication Architecture for the Agentic Web

Yuqi Qiu, Zuyao Xu, Lu Sun, Xiang Li, Fasheng Miao, Fubin Wu, Haixin Duan, Zheli Liu

Cross-domain architecture from the related ATP arXiv paper (2610.38398), Figure 1.
Cross-domain architecture from the related ATP arXiv paper (2610.38398), Figure 1. Source ↗

Communication beyond a running instance

Long-lived collaboration should not require every agent instance to stay online. This work studies how administrative domains can maintain stable addresses and receive messages on behalf of logical agents.

Domain-mediated architecture

ATP moves cross-domain transmission and message custody to domain servers. The sender signs the complete envelope; the receiving domain verifies and stores it for later retrieval by an execution instance.

  • Stable communication entries survive offline periods and instance replacement.
  • Saved envelopes support independent checks of source and integrity when verification keys remain trusted and obtainable.
  • DNS discovery connects participating administrative domains.

Prototype and evaluation

The paper evaluates a prototype with a controlled cross-organization LLM-agent workflow, mechanism checks, and latency measurements. It examines continued processing after offline periods or instance migration, saved-message verification, and the overhead of domain mediation.

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