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Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Use the WordPress REST API directly for ordinary apps and automations that can make HTTP requests and handle JSON. Use MCP when an AI host supports it and needs a standardized way to discover and call selected capabilities. You can also combine them: an MCP server can expose narrowly scoped tools to the AI host and call WordPress REST endpoints behind the scenes.
What each one does
WordPress REST API: an interface to a WordPress site
The WordPress REST API is the site’s HTTP/JSON interface for reading and changing WordPress data and performing supported actions. Each site has its own API root. Clients interact with resource-oriented routes using HTTP methods and receive JSON responses and HTTP status codes. Public content can be read without logging in; access to private data and write operations depends on authentication and WordPress permissions. The API index and OPTIONS requests can help a client discover routes and supported operations. Documented resources include posts, pages, media, users, taxonomies, settings and plugins. See the WordPress REST API Handbook.
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MCP: a protocol for AI applications to use server capabilities
The Model Context Protocol (MCP) is a client-server protocol for AI applications. Its messages use JSON-RPC 2.0, and its specification covers lifecycle management, capability negotiation, HTTP authorization, and server features such as tools, resources and prompts. An MCP server can present selected WordPress operations to an AI host; it is not itself a WordPress content API. The server may call the WordPress REST API or use other implementation logic to carry out those operations. See the MCP specification, revision 2025-11-25.
Which should you use?
Use the WordPress REST API directly for conventional integrations
- You are building a website feature, mobile app, backend service or automation that can call HTTP endpoints and process JSON.
- You know which WordPress resources or routes you need.
- You want to avoid operating an extra protocol server and can handle the API’s authentication and permissions directly.
Use MCP at the AI boundary when the host supports it
- Your AI host supports MCP and needs a common way to discover and invoke tools or retrieve resources.
- You want to expose task-focused capabilities instead of giving an AI system a broad, generic API surface.
- You can build and operate an MCP server with appropriate authentication and authorization.
Use both when the AI host needs MCP but WordPress remains the system of record
A common design is to have an MCP server expose a limited set of operations—such as finding a post or submitting a draft—and call WordPress REST endpoints using a dedicated WordPress identity. This layered approach combines the two interfaces; neither specification guarantees that a ready-made adapter exists or configures its security for you.
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How the interfaces compare
| Question | WordPress REST API | MCP |
|---|---|---|
| What layer does it serve? | The API of an individual WordPress site. | The AI application’s connection to capabilities exposed by an MCP server. |
| How does a client discover functionality? | The API index and endpoint descriptions; clients can also use OPTIONS requests. |
Clients negotiate server capabilities and can list tools, resources and prompts. |
| What does it expose? | WordPress resources and their HTTP operations. | Named callable tools with defined inputs and results, contextual resources, and reusable prompts. |
| How does it connect? | Over HTTP, for clients able to make requests. | The specification describes stdio for a client-launched local server and Streamable HTTP for networked communication. Confirm that the AI host supports the transport and protocol revision you intend to use. |
| What does operating it involve? | A direct client can avoid an additional MCP service layer. | An MCP server or adapter adds a component to deploy, secure and maintain. This is an architectural trade-off, not a measured cost comparison. |
Authentication and security at both boundaries
Authenticate WordPress API requests appropriately
WordPress cookie authentication is for requests made in a logged-in WordPress context. REST nonces protect cookie-authenticated requests against cross-site request forgery; without a nonce, the request is treated as unauthenticated. For external programmatic access, WordPress Application Passwords are separate, revocable credentials associated with a user and commonly used with HTTP Basic Authentication over HTTPS. Site configuration, plugins or filters can disable or restrict them. WordPress documents these mechanisms in its REST API authentication guidance and Application Passwords documentation.
Secure the MCP connection and the WordPress operations separately
MCP’s authorization framework applies to the MCP connection; it does not decide which WordPress capabilities the server’s credentials can exercise. An adapter must enforce the intended access at the WordPress boundary too. For Streamable HTTP, the MCP transport specification requires servers to validate incoming Origin headers to guard against DNS rebinding and to return HTTP 403 for a present invalid origin. It recommends that local servers bind to localhost and that servers implement proper authentication. Follow the deployed protocol revision’s current requirements and guidance.
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Public WordPress REST endpoints may be accessed from any site, but that does not grant access to edit private content. Give each integration only the WordPress capabilities it needs, keep credentials secret, use HTTPS and make write operations deliberate and auditable. WordPress explains the distinction between public access and authenticated requests in its REST API FAQ.
What WordPress’s Abilities API does—and does not establish
WordPress’s Abilities API documentation describes REST endpoints and lists Application Passwords as a supported external authentication method. That is WordPress-specific documentation for exposing and discovering abilities; it does not establish that WordPress core includes a general-purpose MCP server. Nor does it verify which third-party MCP plugins are currently maintained or compatible. Treat a plugin or bridge as a separate implementation and check its maintenance, permissions and compatibility before relying on it. See the WordPress Abilities API documentation.
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