The 126th meeting of the Internet Engineering Task Force — the volunteer-driven body whose output shapes every protocol the modern internet runs on — opened Saturday in Vienna and runs through July 24. The Hackathon and Code Sprint are underway this weekend. Full working group sessions begin Monday and continue through Friday afternoon. For engineers who architect multi-agent systems, the most consequential two hours of the week happen Thursday morning. That is when a Birds-of-a-Feather session called agentproto convenes to address a problem that has been building for the past eighteen months: five competing AI agent protocols — Anthropic's Model Context Protocol, Google's Agent2Agent, the Agent Communication Protocol, the Agent Network Protocol, and Cisco's Agntcy Framework — have each staked out overlapping territory without any of them clearing the one bar that makes a protocol truly interoperable across organizational boundaries. That bar is an IETF RFC. The agentproto session is not a product announcement or a panel discussion. It is the formal mechanism by which the IETF decides whether to charter a Working Group. If it does, the resulting standard — likely an RFC two to three years out — would establish the protocol baseline that every vendor shipping inter-domain AI agent infrastructure would eventually need to implement. If the session reveals too much disagreement to proceed, the community returns to the mailing list and the current landscape of competing proprietary-ish standards continues. The IETF has published a full overview of the five scheduled BoFs. This is the decision the Vint Cerf warning pointed toward. Six days before IETF 126 opened, TechTimes published Cerf's retirement argument: that AI agent systems running at machine speed cannot tolerate the semantic ambiguity of natural-language inter-agent communication, and that the industry will be forced — as it was in 1974 — toward formal, unambiguous