When Agents Supply Their Own Premises: Can Crypto Solve the Agent Trust Boundary?
docybo · reddit · 2026-08-10
While building a deterministic authorization layer for AI agents, a developer ran into a tricky trust-boundary problem: even if the system strongly protects its verdict using signed authorization, intent binding, state-hash binding, and replay protection, what has cryptography actually proven if a compromised agent runtime can influence both the proposed action AND some of the premises used to evaluate it?
The author points out that current mechanisms only prove that "the signed decision is consistent with the supplied inputs," not that "the inputs came from authoritative sources." An agent runtime might quietly supply self-reported premises like agentid, tool identity, execution depth, or state objects.
This leads to two core areas of inquiry:
- Which evaluator premises require independent provenance, and which can safely remain proposer-declared?
- For state objects, is an authoritative guard-side read sufficient, or should the state provider eventually emit a signed/versioned attestation? The author is particularly interested in confused-deputy paths and TOCTOU vulnerabilities.
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