MCP for agent-to-agent comms may be the riskiest protocol you’ve never heard of
AI-rewritten: This is a summary of an article from Ars Technica, rewritten by AI (Qwen, running locally) to make it easier to read. The facts come from the original article – read it for the full story.
Dan Goodin
• October 5, 2026
AI agents are creating new risks as attackers exploit trust gaps between them. In the last five months, Google and four other organizations acknowledged vulnerabilities where one agent spreads harmful instructions to others inside a network. This technique targets specific agents like translators or data analysts. Their internal guardrails are often lax, causing them to follow directions from compromised peers because they explicitly trust each other.