Google I/O 2026 introduced four major AI agent surfaces—Project Mariner, Agent2Agent (A2A), managed MCP servers, and always-on information agents—but each inherits the same core weakness: the model cannot reliably distinguish instructions from untrusted data. The result is a broad new attack surface where poisoned web pages, malicious Agent Cards, and hostile emails can steer agents that have access to Gmail, Drive, and external tools. #GoogleIO2026 #ProjectMariner #Agent2Agent #A2A #MCP #Gmail #GoogleDrive
Keypoints
- Google I/O 2026 launched multiple new agent surfaces at once.
- Project Mariner can be hijacked by indirect prompt injection from web content.
- A2A Agent Cards can be poisoned to mislead agent discovery and trust.
- Background information agents create a dangerous mix of reading, access, and action.
- Logging alone is not enough; agents need strict tool allowlisting and runtime controls.
Read More: https://www.toxsec.com/p/ai-agent-security-after-google-io