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MCP Logto OAuth Policy

Authenticate MCP gateway requests using a gateway-issued OAuth access token, with browser login delegated to Logto.

This is a Logto-friendly wrapper around McpOAuthInboundPolicy. Provide logtoEndpoint + clientId + clientSecret, and Logto's /oidc issuer, JWKS URL, and browser login endpoints are derived automatically.

Configuration

The configuration shows how to configure the policy in the 'policies.json' document.

config/policies.json
{
  "name": "my-mcp-logto-oauth-inbound-policy",
  "policyType": "mcp-logto-oauth-inbound",
  "handler": {
    "export": "McpLogtoOAuthInboundPolicy",
    "module": "$import(@zuplo/runtime)",
    "options": {
      "browserLoginOverrides": {
        "remoteTimeoutMs": 10000,
        "sessionTtlSeconds": 28800,
        "stateTtlSeconds": 900
      },
      "clientId": "$env(LOGTO_CLIENT_ID)",
      "clientSecret": "$env(LOGTO_CLIENT_SECRET)",
      "gateway": {
        "accessTokenTtlSeconds": 900,
        "cimdEnabled": true,
        "refreshTokenTtlSeconds": 2592000
      },
      "logtoEndpoint": "https://your-tenant.logto.app",
      "scope": "openid profile email"
    }
  }
}

Policy Configuration

• name <string> - The name of your policy instance. This is used as a reference in your routes.
• policyType <string> - The identifier of the policy. This is used by the Zuplo UI. Value should be mcp-logto-oauth-inbound.
• handler.export <string> - The name of the exported type. Value should be McpLogtoOAuthInboundPolicy.
• handler.module <string> - The module containing the policy. Value should be $import(@zuplo/runtime).
• handler.options <object> - The options for this policy. See Policy Options below.

Policy Options

The options for this policy are specified below. All properties are optional unless specifically marked as required.

• logtoEndpoint (required) <string> - Your Logto tenant endpoint or custom domain, without the /oidc path. The OIDC issuer, JWKS URL, authorization URL, and token URL are derived from this.
• clientId (required) <string> - The Logto application client_id registered for the gateway's browser login flow.
• clientSecret (required) <string> - The Logto application client_secret. Use $env(...) to source from a secret environment variable.
• scope <string> - OIDC scopes requested during browser login. Defaults to "openid profile email".
• gateway <object> - Gateway-side OAuth token settings. The gateway issuer and advertised URLs are derived from the incoming request origin.
  • accessTokenTtlSeconds <integer> - Lifetime of access tokens issued by /oauth/token. Defaults to 900.
  • refreshTokenTtlSeconds <integer> - Lifetime of refresh tokens issued by /oauth/token. Defaults to 2592000.
  • cimdEnabled <boolean> - Whether to advertise client_id_metadata_document_supported in AS metadata. Defaults to true.
• browserLoginOverrides <object> - Optional overrides for the derived browser-login settings.
  • remoteTimeoutMs <integer> - No description available. Defaults to 10000.
  • stateTtlSeconds <integer> - No description available. Defaults to 900.
  • sessionTtlSeconds <integer> - No description available. Defaults to 28800.

Using the Policy

MCP Logto OAuth Inbound

Authenticate MCP gateway requests using a gateway-issued OAuth access token, with browser login delegated to Logto.

This is a thin Logto-friendly wrapper around the generic McpOAuthInboundPolicy. Use it when you want to configure browser login with logtoEndpoint + clientId + clientSecret instead of the full set of OIDC URLs.

Derived configuration

Given logtoEndpoint: "https://acme.logto.app", the wrapper derives:

Generic field	Derived value
oidc.issuer	https://acme.logto.app/oidc
oidc.jwksUrl	https://acme.logto.app/oidc/jwks
browserLogin.url	https://acme.logto.app/oidc/auth
browserLogin.tokenUrl	https://acme.logto.app/oidc/token
browserLogin.clientId / clientSecret / scope	from policy options

These endpoint shapes come from Logto's OIDC provider mounted at /oidc and its discovery document at https://<your-logto-endpoint>/oidc/.well-known/openid-configuration.

Configuration

Code
{
  "name": "logto-managed-oauth",
  "policyType": "mcp-logto-oauth-inbound",
  "handler": {
    "module": "$import(@zuplo/runtime)",
    "export": "McpLogtoOAuthInboundPolicy",
    "options": {
      "logtoEndpoint": "https://your-tenant.logto.app",
      "clientId": "$env(LOGTO_CLIENT_ID)",
      "clientSecret": "$env(LOGTO_CLIENT_SECRET)"
    }
  }
}

logtoEndpoint must be the HTTPS tenant base URL or custom domain. Do not include /oidc, /.well-known/openid-configuration, or any trailing path.

Pairing

Pair this policy with McpTokenExchangeInboundPolicy and McpProxyHandler, the same as McpOAuthInboundPolicy. Only one MCP OAuth policy is allowed per project; attach the same policy by name to every MCP route.

Read more about how policies work