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A Laravel MCP server reachable over HTTP should be treated as an API that can act with the authenticated user’s authority—not as a harmless assistant endpoint. Authenticate each request, authorize each tool operation, and limit the damage a valid client or stolen token can cause. “Public” means network-reachable; it does not mean anonymous tool execution.
The implementation details depend on your Laravel and laravel/mcp versions. The Laravel 13.x documentation reviewed on October 7, 2026, describes the authentication and authorization patterns below; check the documentation for the versions your application actually runs before copying route code.
What does securing a Laravel MCP server mean?
An MCP server exposes capabilities, or tools, to a client. Depending on what you register, those tools may read private records, change data, or call other services. A request that gets through authentication is therefore not automatically safe: the handler still needs to establish what that particular user may do.
Laravel’s 13.x MCP documentation puts the key boundary plainly: “Adding authentication to your MCP server will require a user to authenticate before using any capability of the server.” That means protecting the HTTP MCP route, not relying on an obscure URL, an assumed-trusted client, or tool discovery alone.
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Choose authentication for the clients you need to support
Laravel’s current guidance distinguishes clients that need an OAuth-based authorization flow from controlled environments where you manage both the application and the client. Use the option that fits the client environment, existing application setup, and credential lifecycle.
| Approach | Fits best when | What to account for |
|---|---|---|
| Passport OAuth 2.1 | External or web-based MCP clients need an authorization flow and interoperability. | Laravel documents registering OAuth discovery and client-registration routes with Mcp::oauthRoutes() and protecting the MCP route with Passport’s auth:api middleware. The integration advertises one mcp:use scope; custom scopes are not currently supported. |
| Sanctum | You already use Sanctum and control the client/server environment, with no client requirement that calls for OAuth. | Laravel documents auth:sanctum on the MCP web route and bearer-token authentication from the client. Manage each token’s expiry, rotation, and revocation. |
| Custom middleware | Your application has a separate authentication mechanism that must be integrated. | The middleware must actually authenticate the HTTP request and establish the user context handlers rely on. Merely checking whether a header exists is not authentication. |
Use Passport for clients that need OAuth
For web-based clients, Laravel recommends Passport OAuth 2.1 when possible. Its documented integration includes an authorization view where a user can approve or reject a client. Do not assume that the single mcp:use scope grants per-tool permissions: enforce those permissions in Laravel application code.
Use Sanctum for a controlled client environment
If your application already uses Sanctum and your client setup does not require OAuth, Laravel documents protecting the MCP route with auth:sanctum. The client sends a bearer token in the Authorization header. Laravel’s production guidance suggests a scoped token per client and discusses 90 days as a reasonable starting expiry, not a mandate or a universal security standard. Set a lifetime that fits your risk and rotation process.
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Make custom authentication resolve a real principal
Custom middleware is useful only if it validates the credential and resolves the authenticated user or other principal handlers will authorize. At the protocol level, an HTTP MCP server is a resource server validating incoming tokens; the authorization server or identity provider issues them. The PHP MCP SDK distinguishes hosted or remote use with Streamable HTTP from a local client launching a server subprocess over STDIO. A local STDIO example does not justify leaving an HTTP endpoint unauthenticated.
Authorize each tool where it acts
Authentication answers who made the request. Authorization answers whether that principal may perform this particular operation on this particular resource. Apply ordinary Laravel policy or permission checks inside tool handlers, and scope queries to the authenticated user rather than accepting a client-supplied user ID as authority.
- Use the authenticated principal available through the MCP request, such as
$request->user(), to scope data access. - Check the relevant policy or permission before sensitive reads, writes, and actions with external effects.
- Use Laravel MCP’s
shouldRegistermechanism when a capability should not be exposed to a user in the first place. - Keep the handler check even when a tool is conditionally registered. Hiding a tool from discovery is not a substitute for authorization at the operation boundary.
Pay special attention to destructive tools: verify both the user’s permission and the target resource before making an irreversible change. If a tool calls another service, apply the application’s authorization rules before making that call too.
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Limit request volume and the impact of misuse
Attach Laravel’s throttle middleware to the MCP route, and choose a request budget based on tool behavior, downstream cost, and expected client use. Laravel’s production guidance gives 30 requests per minute for a support workflow as an example, not a generally validated or universally safe limit. A read-only lookup and a tool that triggers expensive work or writes data should not necessarily have the same budget.
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Do not forward the client’s bearer token
Laravel’s engineering article, “Laravel MCP Server: Auth & Security Best Practices,” dated March 13, 2026, states: “Never forward the token an MCP client sends you to a downstream API.” A token issued to authenticate an MCP client is not automatically valid or appropriate for another service. Use a separately stored credential for each downstream integration and enforce the relevant audience and authorization boundaries.
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Authenticate each HTTP request with its bearer credential rather than relying on a browser session as the MCP request’s identity. Store credentials securely, limit their privileges, and have a process to rotate or revoke them when they expire, are compromised, or are no longer needed.
Return useful expected errors without exposing internals
Map validation failures and other expected conditions to structured responses the client can act on. For unexpected exceptions, return a generic message to the client and send the detailed error to internal logging or monitoring. Stack traces, class paths, and internal identifiers can disclose implementation details and make client behavior harder to handle reliably.
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Deploy and verify the boundary
Before exposing the endpoint, check the deployed route and handler behavior—not just the MCP server’s tool list.
Quick Recap
- Confirm versions. Record the Laravel and
laravel/mcpversions, then use the matching documentation for route and authorization APIs. - Protect the HTTP route. Attach the chosen authentication middleware to the MCP web route. If using Passport, configure its OAuth routes and the documented middleware for your version.
- Test without credentials. Send an MCP request without a bearer token and confirm it cannot execute a tool.
- Test identity and permissions. Authenticate as users with different roles and verify that each sees or can invoke only permitted capabilities, including against resources belonging to other users.
- Test harmful and costly cases. Check that destructive actions require the right permission and that repeated requests are throttled as intended.
- Review downstream calls and errors. Confirm the MCP client token is not forwarded, downstream credentials are separate, and unexpected failures do not reveal stack traces to the client.
- Operate credentials over time. Confirm token expiry, rotation, revocation, and audit practices work in the deployed environment.
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