Short answer. The best MCP gateways in 2026 connect to your identity provider and check every tool call against both the delegating user and the agent, so access ends on the agent's next call. Most gateways already cover routing and SSO, so compare how they behave after sign-in. Two quick tests show the difference.
Revocation and agent identity tests show which gateways hold up after sign-in
Try both during a vendor trial. Each test shows whether the gateway decides access once at sign-in or on every call.
Revoke a user mid-task. Disable the user in your IdP while a long agent job is running, then watch the next tool call. If it still runs, the gateway trusts the session until the token expires, which can be hours. For those hours, the agent of someone who has left or been compromised keeps working.
Send one request from two agents. Use the same user's token from an approved client and from a plain script. If both get the same access, the gateway only sees the user. You then can't block or audit one agent without also cutting off the person.
Security teams judge MCP gateways on identity and access first
An MCP gateway gives every agent one controlled path to your tools, so security teams can manage and audit agent access in one place. Without one, API keys sit on laptops and offboarding means hunting through config files.
When you evaluate gateways, check for:
- SSO and SCIM. Access follows joiners and leavers in Okta or Entra.
- Per-tool rules. A role can read CRM records without seeing the delete tool.
- No standing credentials. Agents don't hold long-lived API keys.
- Audit per call. Each call names the person and the agent.
- Deployment fit. VPC, on-prem or air-gapped options for regulated teams.
- MCP auth support. OAuth 2.1 and RFC 9728 for remote servers that use authorization.
Per-request authorization closes the gaps a sign-in check leaves
Most gateways check who you are when a session starts and then apply role-based rules to tool calls. That leaves gaps that show up in production:
- A user changes teams or leaves mid-session, and their agent keeps running with the old permissions until the session or token expires.
- A prompt-injected agent calls a tool its role allows, against data the delegating user should never touch.
- Several agents share one service credential, so the audit log shows the service account and loses the person behind the call.
Closing these gaps takes real-time authorization per request, based on the delegating user and the agent, with no standing credentials on the agent. Some gateways include it. If yours doesn't, add an authorization layer next to it.
SecureAuth Agent Authority works with your Identity Provider to authorize each agent tool call in real time, per request, using the identity of the delegating user.
Explore Agent Authority by SecureAuthFrequently Asked Questions
Do I need an MCP gateway if I already have an API gateway?
An API gateway routes HTTP traffic. MCP adds tool discovery and tool calls inside JSON-RPC messages, so you need something that reads those messages to filter tools and log calls. Some API gateway vendors now do this.
What does enterprise MCP mean?
Enterprise MCP usually means running MCP across many teams with central access control, SSO, audit and approved server catalogs. The MCP project added an Enterprise-Managed Authorization extension so the corporate IdP can decide which MCP servers each employee can reach.
Does an MCP gateway handle SSO?
Most do for the people signing in. SSO alone won't stop a revoked user's agent mid-task, so check that access is authorized per request, in real time.