MPAC: A Multi-Principal Agent Coordination Protocol for Interoperable Multi-Agent Collaboration

The AI agent ecosystem has converged on two protocols: the Model Context Protocol (MCP) for tool invocation and Agent-to-Agent (A2A) for single-principal task delegation. Both assume a single controlling principal, meaning one person or organization that owns every agent. When independent principals' agents must coordinate over shared state, such as engineers' coding agents editing the same repository, family members planning a shared trip, or agents from different organizations negotiating a jo

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ethics.ai (10 April 2026), “MPAC: A Multi-Principal Agent Coordination Protocol for Interoperable Multi-Agent Collaboration,” evidence record 6090, https://ethics.ai/record/6090 (originally published by arXiv).

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