A transit dispatch system coordinates agents over both A2A and MCP protocols, and the security architect wants one consistent place to enforce policy regardless of which protocol a given interaction uses. What should the architect rely on?
Select an answer to reveal the explanation.
Short Explanation
Running one enforcement layer per protocol is like hiring a separate security guard for each entrance to the same building — twice the staff, twice the chance one gate drifts out of sync with the other. Agent Gateway is the single guard post that watches every entrance, A2A and MCP alike, so one policy update reaches all of it at once. That consistency is exactly what "one consistent place" is asking for.
Full Explanation
Agent Gateway sits at the traffic layer between agents and the tools or other agents they interact with, and it is designed to enforce policy consistently regardless of the underlying agentic protocol, which is why it fits a mixed A2A-and-MCP environment. Building two separate enforcement layers, one per protocol, technically covers both paths but reintroduces the exact fragmentation the architect is trying to avoid: a policy change now has to be made twice, correctly, and any drift between the two implementations becomes an exploitable gap. Agent Registry tracks agent versions and deployment metadata, which is orthogonal to protocol-level traffic enforcement; knowing which version is deployed doesn't enforce what that version is allowed to do at the moment it communicates over A2A or MCP. Model Armor filters conversational content for manipulation or sensitive leakage, which is a valuable but narrower guardrail focused on content, not the general-purpose policy enforcement point for traffic across protocols that the scenario calls for. A scope caveat: a single enforcement point simplifies policy management but still requires that point to genuinely understand both protocols' semantics rather than treating one as a lesser-supported afterthought. As an operational check, an architect can push one policy change and confirm it takes effect identically for an A2A interaction and an MCP interaction without separate configuration.