The short version
An agent authorization gateway answers one question before a tool call happens: may this agent, on behalf of this user, call this tool with this scope? The identity products (Arcade, Auth0’s Auth for MCP, Aembit, Okta) also answer with which credential. Cerbos is a policy decision point: it returns the allow or deny and leaves credentials to the caller.
An agent firewall answers a different question once the call is allowed: what is in it, is it safe, and what did we decide? Pipelock inspects payloads routed through it and can emit signed receipts when a signing key is configured.
Authorization sprawl is a real problem and the identity vendors are solving it. It is the permission half. The content half stays open until something reads the bytes.
How the authorization products describe themselves
Arcade says agents act as real users with dynamic permissions through your existing identity provider and OAuth flows, credentials never leave its runtime, and a control plane records what the agent did, for which user, in which system.
Auth0 for AI Agents describes Auth for MCP: OAuth 2.1 and OIDC built in, resource-scoped tokens, permission downscoping through token exchange, fine-grained authorization, and a human kill switch for sensitive actions.
Cerbos is an open-source policy decision point with enforcement points, applying fine-grained authorization across apps, APIs, AI agents, MCP servers, and workloads, and logging every allow and deny decision with context.
Aembit positions identity and access management for agentic AI and MCP next to its workload identity product.
Okta lists Okta for AI Agents and a Cross App Access protocol under its agentic AI security offerings.
The common thread: identity in, a decision out, and in the identity products a scoped credential with it.
What authorization catches that a firewall doesn’t
The wrong actor. An agent with no grant for a tool is refused before any request exists. Pipelock has tool policy in config but no notion of the user behind the agent.
Over-broad credentials. Scoped, short-lived tokens and downscoping through token exchange shrink what a compromised agent can do. Pipelock holds no credentials by design.
Revocation. Pull a grant and the authorization layer stops approving new calls for it; Cerbos advertises revoking permissions in seconds. A firewall enforces policy on traffic, not on identity.
What a firewall catches that authorization doesn’t
Leaked credentials in an allowed call. A permitted POST can carry a cloud key in its body. DLP on the wire catches it; a permission check does not read bodies.
Injected responses. A permitted server can return instructions that hijack the agent. Response scanning catches it; authorization already said yes.
Poisoned or drifting tool descriptions. An authorized MCP server can change its tool description mid-session. Fingerprinting catches the change.
SSRF. An allowed tool can be told to fetch a cloud metadata endpoint. Destination checks catch it.
Evidence of the decision. Authorization logs record the allow. With a signing key configured, Pipelock can emit a signed receipt for what it inspected and decided, verifiable offline against the operator’s key.
Side-by-side
| Authorization gateway | Agent firewall | |
|---|---|---|
| Question answered | May this actor call this tool, with what credential? | Is this call safe, and what did we decide? |
| Input it reads | Identity, scopes, policy, tool name | Request and response bytes, tool descriptions, destinations |
| Failure it stops | Wrong actor, over-broad credential, stale grant | Leaked secret, injection, poisoned tool, SSRF |
| Evidence | Allow and deny logs | Signed receipts plus a hash-chained record |
| Open-source example | Cerbos policy decision point | Pipelock |
How to use both
Agent -> authorization gateway (who, what scope, which credential) -> Pipelock (inspect, decide, sign) -> tool, MCP server, internet
The gateway issues the permission, and in the identity products the credential. The firewall reads what the permitted call carries and signs the outcome. A call can pass the first and fail the second, and that is the case the second exists for.
Further reading
- What is an agent firewall?: definition and evaluation checklist
- Pipelock vs agentgateway: a proxy with CEL authorization built in
- Pipelock vs AWS AgentCore Gateway: OAuth on both sides of a managed gateway
- Pipelock vs Runlayer: identity-based access as a managed control plane
- Pipelock on GitHub
Sources checked
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