wp plugin install https://github.com/WordPress/mcp-adapter/releases/latest/download/mcp-adapter.zip --activate

// .wp-env.json
{
  "$schema": "https://schemas.wp.org/trunk/wp-env.json",
  "plugins": [
    "https://github.com/WordPress/mcp-adapter/releases/latest/download/mcp-adapter.zip"
  ]
}

<?php
/**
 * Plugin Name:      My Plugin
 * Description:      Adds MCP tools for my feature.
 * Requires Plugins: mcp-adapter
 */

add_action( 'plugins_loaded', function() {
    if ( ! class_exists( 'WP\MCP\Core\McpAdapter' ) ) {
        // MCP Adapter is not active — show an admin notice or return early.
        return;
    }

    \WP\MCP\Core\McpAdapter::instance();
} );

// Simply register a WordPress ability
add_action( 'wp_abilities_api_init', function() {
    wp_register_ability( 'my-plugin/get-posts', [
        'label' => 'Get Posts',
        'description' => 'Retrieve WordPress posts with optional filtering',
        'category' => 'site',
        'input_schema' => [
            'type' => 'object',
            'properties' => [
                'numberposts' => [
                    'type' => 'integer',
                    'description' => 'Number of posts to retrieve',
                    'default' => 5,
                    'minimum' => 1,
                    'maximum' => 100
                ],
                'post_status' => [
                    'type' => 'string',
                    'description' => 'Post status to filter by',
                    'enum' => ['publish', 'draft', 'private'],
                    'default' => 'publish'
                ]
            ]
        ],
        'output_schema' => [
            'type' => 'array',
            'items' => [
                'type' => 'object',
                'properties' => [
                    'ID' => ['type' => 'integer'],
                    'post_title' => ['type' => 'string'],
                    'post_content' => ['type' => 'string'],
                    'post_date' => ['type' => 'string'],
                    'post_author' => ['type' => 'string']
                ]
            ]
        ],
        'execute_callback' => function( $input ) {
            $args = [
                'numberposts' => $input['numberposts'] ?? 5,
                'post_status' => $input['post_status'] ?? 'publish'
            ];
            return get_posts( $args );
        },
        'permission_callback' => function() {
            return current_user_can( 'read' );
        },
        'meta' => [
            'public' => true, // Expose to clients, including the default MCP server
        ],
    ]);
});

// With the meta.public flag, the ability is exposed through the default MCP server.
// In the default server configuration, discover it via `discover-abilities`
// and invoke it via `mcp-adapter/execute-ability` rather than expecting
// it to appear as its own entry in `tools/list`.
// To opt out of MCP while remaining public to other clients, explicitly set
// meta.mcp.public to false.
// To expose only through MCP, omit `meta.public` and set `meta.mcp.public` to true.
// Without either public flag, abilities are only accessible through custom MCP
// servers that explicitly list them.
// Note: how far `meta.public` reaches depends on the WordPress version. WordPress
// core starts applying `meta.public` to the REST API (`meta.show_in_rest`) in 7.1. On
// WordPress 6.9 and 7.0, this adapter honors `meta.public` for MCP, but REST API
// access still requires setting `meta.show_in_rest` to true.

# List all available MCP servers
wp mcp-adapter list

# Test the discover abilities tool to see all available WordPress abilities
echo '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"mcp-adapter-discover-abilities","arguments":{}}}' | wp mcp-adapter serve --user=admin --server=mcp-adapter-default-server

# Test listing available tools
echo '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}' | wp mcp-adapter serve --user=admin --server=mcp-adapter-default-server

{
  "mcpServers": {
    "wordpress-default": {
      "command": "wp",
      "args": [
        "--path=/path/to/your/wordpress/site",
        "mcp-adapter",
        "serve",
        "--server=mcp-adapter-default-server",
        "--user=admin"
      ]
    },
    "wordpress-custom": {
      "command": "wp",
      "args": [
        "--path=/path/to/your/wordpress/site",
        "mcp-adapter",
        "serve",
        "--server=your-custom-server-id",
        "--user=admin"
      ]
    }
  }
}

{
  "mcpServers": {
    "wordpress-http-default": {
      "command": "npx",
      "args": [
        "-y",
        "@automattic/mcp-wordpress-remote@latest"
      ],
      "env": {
        "WP_API_URL": "http://your-site.test/wp-json/mcp/mcp-adapter-default-server",
        "LOG_FILE": "/path/to/logs/mcp-adapter.log",
        "WP_API_USERNAME": "your-username",
        "WP_API_PASSWORD": "your-application-password"
      }
    },
    "wordpress-http-custom": {
      "command": "npx",
      "args": [
        "-y",
        "@automattic/mcp-wordpress-remote@latest"
      ],
      "env": {
        "WP_API_URL": "http://your-site.test/wp-json/your-namespace/your-route",
        "LOG_FILE": "/path/to/logs/mcp-adapter.log",
        "WP_API_USERNAME": "your-username",
        "WP_API_PASSWORD": "your-application-password"
      }
    }
  }
}

add_action( 'mcp_adapter_init', function( $adapter ) {
    $adapter->create_server(
        'my-server-id',                    // Unique server identifier
        'my-namespace',                    // REST API namespace
        'mcp',                             // REST API route
        'My MCP Server',                   // Server name
        'Description of my server',        // Server description
        'v1.0.0',                          // Server version
        array(                             // Transport methods
            \WP\MCP\Transport\HttpTransport::class,
        ),
        \WP\MCP\Infrastructure\ErrorHandling\ErrorLogMcpErrorHandler::class,        // Error handler
        \WP\MCP\Infrastructure\Observability\NullMcpObservabilityHandler::class,    // Observability handler
        array( 'my-plugin/my-ability' ),   // Abilities to expose as tools
        array(),                           // Resources (optional)
        array()                            // Prompts (optional)
    );
} );