Model Context Protocol (MCP): The Universal Standard for Connecting AI to Data & Tools
Model Context Protocol (MCP) is an open, standardized protocol developed by Anthropic that establishes a universal client-server interface for LLMs to securely query databases, inspect local file trees, and execute tools without vendor lock-in.
1.The N x M Integration Problem in AI Development
2.Core Primitives: Resources, Prompts, and Tools
3.Security Isolation and Principle of Least Privilege
import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import { CallToolRequestSchema, ListToolsRequestSchema } from "@modelcontextprotocol/sdk/types.js";
const server = new Server({ name: "db-mcp-server", version: "1.0.0" }, { capabilities: { tools: {} } });
// 1. Expose Available Tools
server.setRequestHandler(ListToolsRequestSchema, async () => ({
tools: [
{
name: "query_database",
description: "Run a read-only SQL query against customer DB",
inputSchema: {
type: "object",
properties: { sql: { type: "string" } },
required: ["sql"],
},
},
],
}));
// 2. Handle Tool Execution
server.setRequestHandler(CallToolRequestSchema, async (request) => {
if (request.params.name === "query_database") {
const sql = String(request.params.arguments?.sql);
// Execute safe query...
return { content: [{ type: "text", text: JSON.stringify([{ id: 1, name: "Acme Corp" }]) }] };
}
throw new Error("Tool not found");
});
const transport = new StdioServerTransport();
await server.connect(transport);Frequently Asked Questions
Is MCP tied to Anthropic Claude or can other LLMs use it?
MCP is fully open-source and model-agnostic. Any model (including GPT-4o, DeepSeek-R1, and Llama 3) can connect to MCP servers via standard gateways or agent harnesses.
What transports does MCP support?
MCP currently supports standard input/output (stdio) for local CLI processes and Server-Sent Events (SSE) over HTTP for remote network servers.
How does MCP differ from standard function calling?
Function calling is an API parameter format for returning tool requests. MCP is a complete bidirectional protocol that handles tool discovery, capability negotiation, dynamic resource reading, and state management.