MCP Gateway vs AI Gateway: What’s the Difference?

An MCP gateway governs how AI clients call tools on MCP servers, and an AI gateway governs every kind of AI traffic: model calls, tool calls, agent calls, and API requests. The MCP gateway is one part of an AI gateway, not a competitor to it. Workato AI Gateway contains four gateways, and MCP Gateway is the one that handles tool traffic over the Model Context Protocol. The other three are Model Gateway, Agent Gateway, and API Gateway.

The confusion comes from vendors who use “AI gateway” for model proxies and “MCP gateway” for tool proxies without saying where one ends. This article draws the line by traffic type.

What does an MCP gateway govern?

An MCP gateway governs how AI clients call tools on MCP servers. When a client calls a tool, the gateway authenticates the user, authorizes the call, applies rate and concurrency limits, and logs the invocation. Workato MCP Gateway covers three kinds of servers: servers you compose in Workato, Workato prebuilt servers, and third-party servers you bring in by proxy. Policies apply across that whole estate instead of server by server. Our guide to what an MCP gateway is covers the full definition.

What does an AI gateway govern?

An AI gateway governs the full path of an AI request. Model calls, tool calls, agent-to-agent calls, and API requests all land under one identity model, one policy model, and one audit trail. Workato AI Gateway names four surfaces: Model Gateway handles LLM calls, MCP Gateway handles tool calls, Agent Gateway handles agent collaboration through open protocols, and API Gateway handles managed REST endpoints. Our guide to what an AI gateway is goes deeper.

How do the two compare side by side?

The two differ in scope, and this table separates them by the traffic each one sees.

Dimension	MCP gateway	AI gateway
Traffic governed	Tool calls over MCP	Model, tool, agent, and API calls
Typical caller	AI client or agent	Application, agent, or user
Destination	MCP server	Model, MCP server, agent, or API
Identity	Per user into the tool	One identity model across surfaces
Cost controls	Tool-call limits	Token limits plus tool-call limits
Workato product	Workato MCP Gateway	Workato AI Gateway (four gateways)

If your only AI traffic is tool calls, an MCP gateway is the whole requirement. If agents also call models and other agents, the same policy has to reach those hops. That is the practical line between the two.

Why does one request cross more than one gateway?

Because an agent action spans more than one traffic type. The agent calls a model to decide what to do, then reaches a tool over MCP, and the tool executes against an API. Govern those hops separately and you end up with separate logs and four places to set one rule.

Workato makes the point directly: a masked PII field, a blocked model, or a revoked key should apply the instant you set it, wherever in the chain it matters. That only works when the MCP Gateway and Model Gateway share identity and policy, and merely coexisting isn’t enough.

Where do the Model, Agent, and API gateways fit?

The Model Gateway governs the conversation with the model, and the MCP Gateway governs what the agent does with the answer. A model gateway sees the prompt and the response, but it can’t see that the agent then called a tool that writes to a record. Workato Model Gateway adds approved-model lists, routing, token metering, and limits per team, project, or automation, while MCP Gateway adds tool authorization and audit. Together they cover the decision and the action.

Agent Gateway covers agent-to-agent collaboration through protocols such as A2A, and it inherits governance from the gateways around it. Calls that end at a tool go through the MCP Gateway, and LLM calls made during an agent conversation go through the Model Gateway. API Gateway completes the chain, since an API exposed through Workato API Gateway can also be published as a governed agent tool through the MCP Gateway, so the same policy covers both.

Can you start with just an MCP gateway?

Yes, an MCP gateway works on its own. Most Workato customers begin with one gateway, often the MCP Gateway or the Model Gateway, and because identity, policy, and audit are shared across all four, adding a second doesn’t start a second governance project. Teams that start with the MCP Gateway usually do so because agents are about to touch business systems. Workato Enterprise MCP delivers that starting point with the registry, the proxy for third-party servers, and Verified User Access, which carries the real user’s identity to the downstream app.

Which should you buy first?

Buy first the gateway that covers your largest uncontrolled traffic. Three signals help you spot it. If model keys sit in application code, start with the Model Gateway. If agents are about to touch Salesforce, ServiceNow, or finance systems, start with the MCP Gateway. If several teams are building agents, add the Agent Gateway so delegation runs under one policy.

Then look at what sits behind the gateway. A gateway governs calls, while Workato Enterprise Skills perform multi-step work as one governed action, which lowers how many calls an agent makes in the first place.

Summary: MCP Gateway vs AI Gateway

An MCP gateway is a component of an AI gateway: the first governs tool calls, and the second governs all AI traffic. Use an MCP gateway alone when tool calls are your only AI traffic, and use an AI gateway when agents also call models, other agents, and APIs. Workato MCP Gateway is one of four gateways in Workato AI Gateway, and shared identity, policy, and audit make one rule apply along the whole request chain.

FAQ

Is an MCP gateway part of an AI gateway?

Yes, in Workato’s structure. MCP Gateway is one of four gateways inside the AI Gateway.

Can I use an MCP gateway without an AI gateway?

Yes. Most customers start with one gateway and add others.

Does an AI gateway govern MCP servers?

Yes, through its MCP gateway surface. Calls to any MCP server pass through it.

What is the difference between an MCP gateway and an LLM gateway?

An LLM gateway governs model calls. An MCP gateway governs tool calls. An agent action often needs both.

Does Workato support third-party MCP servers?

Yes, by proxy. Workato brokers credentials centrally, lets admins enable tools individually, and logs calls under named identities.