Model Context Protocol (MCP), released by Anthropic in late 2024, has become a rapidly adopted standard for connecting AI models to external tools and data sources. Here is a clear explanation of what it is and why it matters.
The Problem MCP Solves
Before MCP, every AI integration was custom. If you wanted Claude to read your Google Calendar, you wrote code specific to that integration. If you wanted it to query your database, that was a separate custom integration. And those integrations only worked with the specific AI they were built for. The result: hundreds of one-off integrations, each requiring maintenance, each not portable to other AI systems. MCP defines a standard way for any AI model to discover, connect to, and use any external tool — like HTTP standardised web communication, or SQL standardised database queries.
How It Works
An MCP server is a lightweight program that exposes tools, resources, or prompts to AI models that speak the MCP protocol. The AI client (Claude Desktop, Cursor, any MCP-enabled application) connects to one or more MCP servers and discovers what capabilities they offer. Then, when the AI is processing a task, it can invoke those tools as needed: “search the web using the Exa MCP server,” “read the project’s database using the PostgreSQL MCP server,” “check my calendar using the Google Calendar MCP server.” The server handles the actual tool call and returns the result to the AI.
The Ecosystem in 2025
The MCP ecosystem has grown rapidly since launch. Hundreds of MCP servers are publicly available: filesystem access, web search (Exa, Brave), database connections (PostgreSQL, SQLite, MongoDB), productivity tools (Notion, Linear, GitHub, Slack, Google Drive), browser control, code execution, and more. Claude Desktop supports MCP natively; Cursor, Continue, and other developer tools have adopted it. The pattern has caught on: the standardisation that MCP provides is genuinely useful for the ecosystem.
For Non-Developers
In practice, MCP means: Claude Desktop (the desktop app) can be configured to access your local files, your calendar, your notes, and specific web services — without you writing code. The configuration is a JSON file pointing to the servers you want to use; most servers are installed with a single command. If you use Claude Desktop and have not explored MCP, the Anthropic documentation page and the mcp.so directory are the starting points.
