Nokia Nokia China Mobile Alibaba Cloud Cisco The current generation of AI agent communication protocols enables basic tool access and inter-agent messaging, but lacks the architectural and protocol foundations required for open, interoperable, and resilient Internet-scale deployments. This document presents the AI Agent Interoperable Protocol Framework (AIPF), a layered framework that identifies the key building blocks and the protocol suite required for interoperable Agent-to-agent/ Agent-to-tool communication.