The MCP Adapter bridges WordPress's Abilities API with the Model Context Protocol, providing a standardized way for AI agents to interact with WordPress functionality. It converts WordPress abilities into MCP components—tools, resources, and prompts—exposing them through MCP servers that can be discovered, configured, and invoked by clients. The adapter supports multiple transport methods, including HTTP for MCP-compliant communication and STDIO for local development and CLI workflows, with a design that allows custom transports via a McpTransportInterface. It includes built-in WordPress-compatible error handling, plus extensible server-specific error handlers, and built-in observability with zero-overhead metrics and pluggable handlers for monitoring. Validation is applied to tools, resources, and prompts, ensuring conformance to MCP schemas, and granular permission control via transport permissions. The architecture intentionally separates concerns (core management, transport, handlers, and domain components) and provides CLI integration through WP-CLI, automatic server discovery, and REST API integration. Jetpack Autoloader is recommended to manage dependencies in multi-plugin environments.