Add code samples for MCP tooling

docs/guides/tools-connectors-mcp/responses/approvals-always-require-approval.cs

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+// SAMPLE: Generate response from remote MCP with approval through Responses API
+// PAGE: https://platform.openai.com/docs/guides/tools-connectors-mcp#approvals
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+
+ResponseCreationOptions options = new();
+options.Tools.Add(ResponseTool.CreateMcpTool(
+    serverLabel: "dmcp",
+    serverUri: new Uri("https://dmcp-server.deno.dev/sse"),
+    toolCallApprovalPolicy: new McpToolCallApprovalPolicy(GlobalMcpToolCallApprovalPolicy.AlwaysRequireApproval)
+));
+
+// STEP 1: Create response that requests tool call approval
+OpenAIResponse response1 = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputTextPart("Roll 2d4+1")
+    ])
+], options);
+
+McpToolCallApprovalRequestItem? approvalRequestItem = response1.OutputItems.Last() as McpToolCallApprovalRequestItem;
+
+// STEP 2: Approve the tool call request and get final response
+options.PreviousResponseId = response1.Id;
+OpenAIResponse response2 = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateMcpApprovalResponseItem(approvalRequestItem!.Id, approved: true),
+], options);
+
+Console.WriteLine(response2.GetOutputText());

docs/guides/tools-connectors-mcp/responses/approvals-never-require-approval.cs

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+// SAMPLE: Generate response from remote MCP with no approval through Responses API
+// PAGE: https://platform.openai.com/docs/guides/tools-connectors-mcp#approvals
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+
+ResponseCreationOptions options = new();
+options.Tools.Add(ResponseTool.CreateMcpTool(
+    serverLabel: "deepwiki",
+    serverUri: new Uri("https://mcp.deepwiki.com/mcp"),
+    allowedTools: new McpToolFilter() { ToolNames = { "ask_question", "read_wiki_structure" } },
+    toolCallApprovalPolicy: new McpToolCallApprovalPolicy(GlobalMcpToolCallApprovalPolicy.NeverRequireApproval)
+));
+
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputTextPart("What transport protocols does the 2025-03-26 version of the MCP spec (modelcontextprotocol/modelcontextprotocol) support?")
+    ])
+], options);
+
+Console.WriteLine(response.GetOutputText());

docs/guides/tools-connectors-mcp/responses/filtering-tools.cs

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+// SAMPLE: Generate response from a specific tool of a remote MCP through Responses API
+// PAGE: https://platform.openai.com/docs/guides/tools-connectors-mcp#filtering-tools
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+
+ResponseCreationOptions options = new();
+options.Tools.Add(ResponseTool.CreateMcpTool(
+    serverLabel: "dmcp",
+    serverUri: new Uri("https://dmcp-server.deno.dev/sse"),
+    allowedTools: new McpToolFilter() { ToolNames = { "roll" } },
+    toolCallApprovalPolicy: new McpToolCallApprovalPolicy(GlobalMcpToolCallApprovalPolicy.NeverRequireApproval)
+));
+
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputTextPart("Roll 2d4+1")
+    ])
+], options);
+
+Console.WriteLine(response.GetOutputText());

docs/guides/tools-connectors-mcp/responses/quickstart-remote-mcp.cs

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+// SAMPLE: Generate response from remote MCP through Responses API
+// PAGE: https://platform.openai.com/docs/guides/tools-connectors-mcp?quickstart-panels=remote-mcp#quickstart
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+
+ResponseCreationOptions options = new();
+options.Tools.Add(ResponseTool.CreateMcpTool(
+    serverLabel: "dmcp",
+    serverUri: new Uri("https://dmcp-server.deno.dev/sse"),
+    toolCallApprovalPolicy: new McpToolCallApprovalPolicy(GlobalMcpToolCallApprovalPolicy.NeverRequireApproval)
+));
+
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputTextPart("Roll 2d4+1")
+    ])
+], options);
+
+Console.WriteLine(response.GetOutputText());