What is Model Context Protocol (MCP)?
10 min read • January 24, 2025
Model Context Protocol (MCP) is an open standard developed by Anthropic that fundamentally changes how AI assistants interact with external tools and data sources.
The Problem MCP Solves
Before MCP, connecting AI to your tools required custom integrations for every service. Want Claude to access Slack? Build a custom integration. Need it to work with Notion? Another custom integration. This approach doesn't scale and creates security concerns.
MCP creates a single, standardized protocol that works with any service. Build one MCP server, and it works with any MCP-compatible AI assistant.
How MCP Works
MCP uses a client-server architecture:
- MCP Client - The AI application (like Claude Desktop)
- MCP Server - A bridge to an external service (like Slack or Notion)
- Protocol - The standardized communication format between them
When you ask Claude to "send a message to Slack," the MCP client sends a request to the Slack MCP server, which translates it into Slack's API format and returns the result.
Key Benefits
Security
OAuth authentication, no API keys exposed, sandboxed execution
Standardization
One protocol works across all tools and AI assistants
Extensibility
Anyone can create MCP servers for new services
Portability
MCP servers work with any compatible AI client
MCP vs. Function Calling
You might wonder how MCP differs from function calling or tool use in AI APIs. The key difference is scope: function calling is typically embedded in API requests, while MCP provides a persistent server that maintains connections, handles authentication, and manages state across multiple interactions.
The Ecosystem
MCP is open source and growing rapidly. There are now MCP servers for dozens of services, from productivity tools (Notion, Slack) to developer platforms (GitHub, Vercel) to CRMs (HubSpot, Salesforce).
Getting Started
The easiest way to start using MCP is through Toolsy, which provides:
- 30+ pre-built MCP servers
- One-click OAuth connections
- An AI wizard for configuration
- Automatic Claude Desktop setup