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Can Open Policy Agent handle AI agent authorization?
If you already run OPA, the good news is you can keep it. The nuance: OPA is excellent at deciding whether an action is allowed, but it trusts the input it is handed. For AI agents you first have to make that input trustworthy.
What OPA does well
Open Policy Agent is a general-purpose policy engine. You write rules in Rego, hand OPA an input document describing a request, and it returns a decision. It is a strong fit for fine-grained authorization: per-operation rules, data-driven conditions, decisions logged with the policy that made them, and policy kept in version control. None of that changes for AI agents — the Rego you would write to authorize an agent's call looks much like what you already write.
Where the gap is for agents
OPA reasons about the input it is given; it does not establish whether that input is true. If the input says "agent = payments-bot" and that claim is just a label the caller asserted, OPA will faithfully apply the payments-bot policy to a request that might not be from payments-bot at all. With human users behind an authenticated session this is usually fine. With AI agents authenticating via a shared key or a self-asserted header, the identity in the input is exactly the thing that cannot be trusted. OPA is deciding correctly on facts that were never verified.
OPA answers "is this allowed?" It does not answer "is this really who they say they are?" For agents, that second question has to be settled first.
Verified identity + OPA together
The clean division of labour: establish identity cryptographically, then let OPA decide. An agent presents a short-lived, sender-constrained token and signs the request; a gateway verifies the signature and the token before anything else. Only after identity is proven does the gateway build OPA's input — now populated with a verified agent identity, owner, and boundary rather than claims. OPA's decision is as sound as always, but it is now reasoning about facts. You keep your Rego and your bundles; you add the verification step in front.
How to combine them
- Issue per-agent identity. Replace shared keys with verifiable, short-lived per-agent tokens. See per-agent identity.
- Verify before you decide. At the gateway, verify the token and request signature first.
- Feed OPA verified input. Build the Rego input from the verified identity, owner, boundary, and the exact operation and resource.
- Keep your policies. Your existing OPA bundles and Rego carry over; decisions log with the policy version.
OATHERA supplies the verified identity OPA needs as input. See integrations for how they connect.
FAQ
We are using Open Policy Agent already. Can it handle AI agent authorization or do I need something else on top?
OPA can authorize AI agents and you can keep your existing Rego, but OPA trusts whatever input it is given. For agents you need a verified identity layer in front of it: the agent presents a short-lived, signed, per-agent token, a gateway verifies it, and only then is OPA handed input containing a proven identity rather than a self-asserted claim. OPA makes the decision; the identity layer makes the decision trustworthy.
Do I have to rewrite my Rego policies for agents?
No. Your existing bundles and Rego carry over. What changes is that the input OPA evaluates is built from a cryptographically verified identity, owner, and boundary instead of unverified labels.
What exactly does OATHERA add to an OPA setup?
Verified per-agent identity as policy input, plus the gateway that verifies the agent's token and signature before OPA is consulted and logs the decision against the policy version that made it.