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Simplify MCP example #534

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Jul 12, 2025
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Simplify MCP example #534

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49 changes: 9 additions & 40 deletions docs/guides/mcp/chat_with_mcp.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
using ModelContextProtocol;
using ModelContextProtocol.Client;
using OpenAI.Chat;
using System.Text.Json;

string mcpCommand = Environment.GetEnvironmentVariable("MCP_SERVER_COMMAND")!; // path to a stdio mcp server
string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
Expand All @@ -23,9 +24,9 @@

// get avaliable tools and add them to completion options
ChatCompletionOptions options = new();
await foreach (McpClientTool chatTool in mcpClient.EnumerateToolsAsync())
await foreach (McpClientTool tool in mcpClient.EnumerateToolsAsync())
{
options.Tools.Add(chatTool.AsOpenAIChatTool());
options.Tools.Add(ChatTool.CreateFunctionTool(tool.Name, tool.Description, BinaryData.FromString(tool.JsonSchema.GetRawText())));
}

// conversation thread
Expand All @@ -40,50 +41,18 @@
switch (chatCompletion.FinishReason)
{
case ChatFinishReason.ToolCalls:
foreach(var call in chatCompletion.ToolCalls)
foreach (var call in chatCompletion.ToolCalls)
{
var mcpArguments = call.FunctionArguments.ToObjectFromJson<Dictionary<string, object>>();
Console.WriteLine("Tool call detected, calling MCP server...");
ModelContextProtocol.Protocol.CallToolResult result = await mcpClient.CallToolAsync(call.FunctionName, mcpArguments!);
Console.WriteLine($"tool call result {result.Content[0]}");
ChatMessage message = call.ToMessage(result.Content.ToAIContents());
conversation.Add(message);
}
var result = await mcpClient.CallToolAsync(call.FunctionName, mcpArguments!);
Console.WriteLine($"Tool call result {result.Content[0]}");
conversation.Add(ChatMessage.CreateToolMessage(call.Id, JsonSerializer.Serialize(result)));
}
goto start;
case ChatFinishReason.Stop:
Console.WriteLine(chatCompletion.Content[0].Text);
break;
default:
throw new NotImplementedException();
}

#region TEMPORARY
// this is temporary. all these APIs will endup being in one of the packages used here.
public static class TemporaryExtensions
{
// this needs to be in the adapter package
public static ChatMessage ToMessage(this ChatToolCall openaiCall, IEnumerable<Microsoft.Extensions.AI.AIContent> contents)
{
List<ChatMessageContentPart> parts = new();
foreach (Microsoft.Extensions.AI.AIContent content in contents)
{
string serialized = System.Text.Json.JsonSerializer.Serialize(content.RawRepresentation);
using System.Text.Json.JsonDocument json = System.Text.Json.JsonDocument.Parse(serialized);
System.Text.Json.JsonElement text = json.RootElement.GetProperty("text");
string textValue = text.GetString() ?? string.Empty;
parts.Add(ChatMessageContentPart.CreateTextPart(textValue));
}
ToolChatMessage message = ChatMessage.CreateToolMessage(openaiCall.Id, parts);
return message;
}

// this is in the adapter package
public static ChatTool AsOpenAIChatTool(this Microsoft.Extensions.AI.AIFunction mcpTool)
{
return ChatTool.CreateFunctionTool(
mcpTool.Name,
mcpTool.Description,
BinaryData.FromString(mcpTool.JsonSchema.GetRawText()));
}
}
#endregion
}