> CORE SERVER ARCHITECTURE [FOUNDATION]

▶ MCP SDK FOUNDATION

Use MCP SDKs (Python, Go, Java) to expose tools with minimal boilerplate

# Everything Server Example
from mcp import Server
from mcp.server import stdio_server

server = Server("everything-server")

@server.tool()
async def echo(message: str) -> str:
    """Echo back the input message."""
    return f"Echo: {message}"

▶ DESIGN PRINCIPLES

🎯 MODULAR DESIGN

One domain per server - focused, composable toolboxes

🔄 STATELESS FUNCTIONS

Idempotent tool functions - predictable, reliable operations

🚀 TRANSPORT OPTIONS

stdio vs HTTP/SSE - choose based on deployment needs

▶ EVERYTHING SERVER ARCHITECTURE

┌─────────────────────────────────────────────────────────────┐
│                  EVERYTHING MCP SERVER                      │
├─────────────────────────────────────────────────────────────┤
│  TOOLS          │  RESOURCES      │  PROMPTS      │ SAMPLING│
│  ├─ echo        │  ├─ static/42   │  ├─ simple    │ ├─ llm  │
│  ├─ add         │  ├─ dynamic     │  ├─ resource  │ └─ comp │
│  ├─ longOp      │  └─ subscribe   │  └─ complex   │         │
│  └─ annotated   │                 │               │         │
├─────────────────────────────────────────────────────────────┤
│         MCP Protocol Layer (stdio/HTTP transport)          │
└─────────────────────────────────────────────────────────────┘

🎮 LIVE DEMO SETUP

DEMONSTRATION: Everything Server's add & echo tools - minimal schema, fast feedback

$ npx -y @modelcontextprotocol/server-everything
[DEMO] Launch Everything Server
[INSPECT] Examine tool definitions and schemas
[TEST] Call echo and add tools directly
[OBSERVE] Response structure and metadata

Key Observations:

Fast feedback loop - immediate tool response
Minimal schema - clear, focused tool definitions
Error handling - graceful failure modes
Metadata structure - consistent response format