Swift SDK

// In Package.swift:
dependencies: [
    .package(url: "https://github.com/modelcontextprotocol/swift-sdk.git", from: "0.11.0")
],
targets: [
    .target(
        name: "YourTarget",
        dependencies: [
            .product(name: "MCP", package: "swift-sdk")
        ]
    )
]

import MCP

@main
struct MyMCPServer {
    static func main() async throws {
        let server = Server(
            name: "MyServer",
            version: "1.0.0",
            capabilities: .init(tools: .init(listChanged: true))
        )

        await server.withMethodHandler(ListTools.self) { _ in
            .init(tools: [
                Tool(name: "greet", description: "Greet a user",
                     inputSchema: .init(properties: ["name": .init(.string)]))
            ])
        }

        await server.withMethodHandler(CallTool.self) { request in
            let name = request.params.arguments?["name"]?.stringValue ?? "World"
            return .init(content: [.text("Hello, \(name)!")])
        }

        let transport = StdioTransport()
        try await server.start(transport: transport)
    }
}

swift build -c release
.build/release/MyMCPServer

{
  "mcpServers": {
    "swift-server": {
      "command": "/path/to/.build/release/MyMCPServer"
    }
  }
}

import MCP

let client = Client(name: "MyApp", version: "1.0.0")
let transport = StdioTransport()
let _ = try await client.connect(transport: transport)

let (content, isError) = try await client.callTool(
    name: "greet",
    arguments: ["name": "Alice"]
)
print(content)