Connect Agents toAny External Service.

public static class MathTools
{
    [LMFunction("Calculates the sum of two numbers.")]
    public static double Add(double a, double b)
    {
        return a + b;
    }

    [LMFunction("Converts a temperature from Celsius to Fahrenheit.")]
    public static double CelsiusToFahrenheit(double celsius)
    {
        return celsius * 9.0 / 5.0 + 32;
    }
}

// Register with the agent
var agent = Agent.CreateBuilder(model)
    .WithTools(tools => tools.Register<MathTools>())
    .Build();

// Connect to an MCP server over Stdio transport
var mcpClient = new McpClient("npx", "-y @modelcontextprotocol/server-filesystem");
await mcpClient.InitializeAsync();

// Discover available tools from the MCP server
var tools = await mcpClient.ListToolsAsync();
foreach (var tool in tools)
    Console.WriteLine($"Tool: {tool.Name} - {tool.Description}");

// Register MCP tools with the agent
var agent = Agent.CreateBuilder(model)
    .WithTools(tools => tools.ImportFromMcp(mcpClient))
    .Build();

// The agent can now use tools from the MCP server
var response = await agent.RunAsync("List the files in the /docs directory.");