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LLM Agent Communication Protocol (LACP) Requires Urgent Standardization: A Telecom-Inspired Protocol is Necessary

Xin Li, Mengbing Liu, Chau Yuen

TL;DR

The paper addresses fragmentation in LLM-agent communication and its risk to safety and interoperability, proposing LACP as a telecom-inspired standard. It draws lessons from telecommunications—open standards, security-by-design, and layered architectures with a minimal core—to justify a principled three-layer protocol. LACP comprises Semantic, Transactional, and Transport layers, with PLAN/ACT/OBSERVE message types, end-to-end security via JWS, and atomic-transaction support to ensure reliability across diverse frameworks. The authors argue that standardization will enable safer, scalable multi-agent collaboration, reproducible research, and an emergent agent economy, particularly for NextG/6G ecosystems, and they call for cross-community collaboration to adopt this approach.

Abstract

This position paper argues that the field of LLM agents requires a unified, telecom-inspired communication protocol to ensure safety, interoperability, and scalability, especially within the context of Next Generation (NextG) networks. Current ad-hoc communication methods are creating a fragmented ecosystem, reminiscent of the early "protocol wars" in networking, which stifles innovation and poses significant risks. Drawing inspiration from the layered, standardized protocols that underpin modern telecommunications, we propose the LLM-Agent Communication Protocol (LACP). LACP establishes a three-layer architecture designed to ensure semantic clarity in communication, transactional integrity for complex tasks, and robust, built-in security. In this position paper, we argue that adopting a principled, universal protocol is not merely beneficial but essential for realizing the potential of distributed AI. Such a standard is critical for ensuring that multi-agent systems can operate safely and reliably in the complex, real-time applications envisioned for 6G and beyond.

LLM Agent Communication Protocol (LACP) Requires Urgent Standardization: A Telecom-Inspired Protocol is Necessary

TL;DR

The paper addresses fragmentation in LLM-agent communication and its risk to safety and interoperability, proposing LACP as a telecom-inspired standard. It draws lessons from telecommunications—open standards, security-by-design, and layered architectures with a minimal core—to justify a principled three-layer protocol. LACP comprises Semantic, Transactional, and Transport layers, with PLAN/ACT/OBSERVE message types, end-to-end security via JWS, and atomic-transaction support to ensure reliability across diverse frameworks. The authors argue that standardization will enable safer, scalable multi-agent collaboration, reproducible research, and an emergent agent economy, particularly for NextG/6G ecosystems, and they call for cross-community collaboration to adopt this approach.

Abstract

This position paper argues that the field of LLM agents requires a unified, telecom-inspired communication protocol to ensure safety, interoperability, and scalability, especially within the context of Next Generation (NextG) networks. Current ad-hoc communication methods are creating a fragmented ecosystem, reminiscent of the early "protocol wars" in networking, which stifles innovation and poses significant risks. Drawing inspiration from the layered, standardized protocols that underpin modern telecommunications, we propose the LLM-Agent Communication Protocol (LACP). LACP establishes a three-layer architecture designed to ensure semantic clarity in communication, transactional integrity for complex tasks, and robust, built-in security. In this position paper, we argue that adopting a principled, universal protocol is not merely beneficial but essential for realizing the potential of distributed AI. Such a standard is critical for ensuring that multi-agent systems can operate safely and reliably in the complex, real-time applications envisioned for 6G and beyond.
Paper Structure (19 sections, 3 figures, 4 tables)

This paper contains 19 sections, 3 figures, 4 tables.

Table of Contents

  1. Introduction
  2. The Problem: A Fragmented LLM-Agent Communication Landscape
  3. Insights from Telecommunications Standardization
  4. LACP: A Principled Communication Framework
  5. Three-Layer Architecture: Separation of Concerns
  6. Anticipated Impact
  7. Conclusion
  8. Experimental Validation of LACP
  9. Experimental Setup
  10. Experiment 1: Performance and Overhead Analysis
  11. Experiment 2: Interoperability Demonstration
  12. Experiment 3: Security Validation
  13. Tampering Attack
  14. Replay Attack
  15. LACP Protocol Example
  16. ...and 4 more sections

Figures (3)

  • Figure 1: LLM Agent Communication: From Ad-Hoc Chaos to LACP Clarity. (a) Without LACP: Fragmentation, ambiguity, and failure. Ad-hoc protocols lack authentication and semantic alignment, leading to disrupted workflows, miscommunication, and unauthorized operations. Malformed or incomplete messages escalate coordination costs and risk system inconsistency. (b) With LACP: Structured, secure, and transactional. Every message is authenticated, semantically grounded in a clear target, and executed as part of an atomic transaction. This ensures end-to-end integrity, minimizes ambiguity, and enables reliable collaboration in safety-critical contexts.
  • Figure 2: LACP’s three-layer architecture. Independent layers enable secure, reliable communication with clearly defined semantic intents, transactional integrity, and flexible transport mechanisms.
  • Figure 3: Layer-by-layer encoding of a PLAN message in LACP. (1) the bare semantic payload, (2) the same payload wrapped by the transactional layer with a JSON Web Signature, and (3) the truncated binary transport frame.