Discussion on "The Attack Was Authorized: The Missing Security Boundary for AI Agents"

The distinction that auth answers "is the caller allowed" but not "did the human actually intend this" is the gap I keep seeing under-discussed. Willison's lethal trifecta makes it concrete: a fully authorized agent with untrusted input and exfil reach is dangerous precisely because every action passes the permission check. Do you see Macaroons or Biscuit becoming practical for scoping intent per action, or is that still mostly research?

Good question. I think both are practical building blocks today, especially Biscuit for agent workflows. But neither understands human intent by itself. A trusted broker still needs to turn approval into a narrowly scoped token: this action, on this resource, within this time and budget. So I’d say the cryptography is ready; the surrounding product layer is still early. The difficult parts are approval UX, translating intent into exact constraints, revocation, and audit. Macaroons or Biscuit could be part of the solution, but not the whole solution.

Static API scopes validate who holds a credential, not why an action is being taken, creating a critical enforcement gap where agentic lateral movement lives. Until formal intent-propagation standards emerge across frameworks like MCP, defending against scope escalation across parent-child agents requires behavioral tracking at the tool execution layer, validating every tool call against the active session context rather than just credential validity.

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The Attack Was Authorized: The Missing Security Boundary for AI Agents

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