Agent Permissions Do Not Compose Across Handoffs, Article Argues

A new article argues that AI agent tool permissions do not automatically compose across handoffs. In its example, a Writer agent, a read-only Reader agent and an email-only Sender agent each stay within their own permissions, yet private customer data still reaches an attacker. The article calls the behavioral constraints that must survive these handoffs "transitive policies" and says they require trusted runtime software outside the models to mediate data access, messages, tool calls and external actions. The claim is the author's argument, not a demonstrated fix: the piece does not report a deployed system that enforces transitive policies or measured results from one.

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