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Interview question · Agent, Tool & MCP Security

What does the same-origin policy protect when an AI agent acts across logged-in sites?

Browser origin isolation still applies to web content. Explain the separate authority of an agent that reads and acts across sites, then constrain data flow, destinations and consequential actions at the agent boundary.

hardNewUpdated Nov 2026

Browser origin isolation still applies to web content. Explain the separate authority of an agent that reads and acts across sites, then constrain data flow, destinations and consequential actions at the agent boundary.

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Alder’s agent compares three shops in a browser that also contains other authenticated sessions. The comparison task has no purchase or messaging grant.

  1. Does ordinary SOP decide whether the agent may send a message from another session?
  2. If an origin is writable, may it receive every private record in the agent’s context?
  3. Can the planner add a new supplier because it appears useful?
  4. What should a browser-agent review demonstrate?

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