08 Oct MCP – Servers, clients, and transports

MCP Architecture includes clients, servers, and transports. Let us understand about MCP Servers, Clients, and Transport Communication Channels with a JSON-like code snippet. Before that, let us understand the concepts using the following video:

MCP Clients (AI Applications)

Role: The AI interface that users interact with,

{
  "client": "Cursor AI",
  "role": "Coordinate conversations and manage MCP servers",
  "responsibilities": [
    "User interface management",
    "Server lifecycle control", 
    "Request routing",
    "Response processing"
  ]
}

Examples:

• Cursor AI (like our example setup)
• ChatGPT
• Claude Desktop
• Any AI application implementing the MCP client

MCP Servers (Data/Tool Providers)

Role: Specialized services that provide data or tools

{
  "server": "FireCrawl",
  "role": "Web scraping capabilities", 
  "capabilities": [
    "Scrape website content",
    "Extract structured data",
    "Handle dynamic content"
  ]
}

Server Types:

• Data Servers(FireCrawl, databases, APIs)
• Tool Servers(calculators, image processors)
• Hybrid Servers(both data and tools)

Transports: Communication Channels

Definition: How clients and servers communicate

Common Transport Types

The most common transports are:

1. Standard Input/ Output
2. HTTP/Web Sockets
3. SSH

Let us understand them one by one:

1. stdio (Standard Input/Output)

{
  "command": "npx -y firecrawl-mcp",
  "args": [],
  "env": {"FIRECRAWL_API_KEY": "..."}
}

• Most common for local development
• Simple and reliable
• Used in our FireCrawl example

2. HTTP/WebSockets

{
  "command": "npx -y firecrawl-mcp",
  "args": [],
  "env": {"FIRECRAWL_API_KEY": "..."}
}
{
  "url": "http://localhost:3000/mcp",
  "headers": {"Authorization": "Bearer ..."}
}

• For remote servers
• Better for production
• Enables scaling

3. SSH

• For secure remote connections
• Enterprise environments

Transport Configuration (Our Example)

{
  "mcpServers": {
    "firecrawl": {
      "command": "cmd /c set FIRECRAWL_API_KEY=fc-d98db442115347998are901339289dda && npx -y firecrawl-mcp",
      "args": [],
      "env": {}
    }
  }
}

This uses the stdio transport with environment variable setup

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