diff --git a/responses/response.go b/responses/response.go
index 80a7d0b0..317491c1 100644
--- a/responses/response.go
+++ b/responses/response.go
@@ -12137,10 +12137,20 @@ func ToolParamOfComputerUsePreview(displayHeight int64, displayWidth int64, envi
 	return ToolUnionParam{OfComputerUsePreview: &computerUsePreview}
 }
 
-func ToolParamOfMcp(serverLabel string, serverURL string) ToolUnionParam {
+func ToolParamOfMcp(serverLabel string, serverURL string, allowedTools []string, requireApproval string) ToolUnionParam {
 	var mcp ToolMcpParam
 	mcp.ServerLabel = serverLabel
 	mcp.ServerURL = serverURL
+	if len(allowedTools) > 0 {
+		mcp.AllowedTools = ToolMcpAllowedToolsUnionParam{
+			OfMcpAllowedTools: allowedTools,
+		}
+	}
+	if requireApproval != "" {
+		mcp.RequireApproval = ToolMcpRequireApprovalUnionParam{
+			OfMcpToolApprovalSetting: param.NewOpt(requireApproval),
+		}
+	}
 	return ToolUnionParam{OfMcp: &mcp}
 }
 
diff --git a/responses/response_test.go b/responses/response_test.go
index 7b73951f..f34197c1 100644
--- a/responses/response_test.go
+++ b/responses/response_test.go
@@ -11,6 +11,7 @@ import (
 	"github.com/openai/openai-go/v2"
 	"github.com/openai/openai-go/v2/internal/testutil"
 	"github.com/openai/openai-go/v2/option"
+	"github.com/openai/openai-go/v2/packages/param"
 	"github.com/openai/openai-go/v2/responses"
 	"github.com/openai/openai-go/v2/shared"
 )
@@ -170,3 +171,149 @@ func TestResponseCancel(t *testing.T) {
 		t.Fatalf("err should be nil: %s", err.Error())
 	}
 }
+
+func TestToolParamOfMcp(t *testing.T) {
+	// Test with all parameters
+	t.Run("with all parameters", func(t *testing.T) {
+		serverLabel := "test-server"
+		serverURL := "https://test-mcp-server.com"
+		allowedTools := []string{"search_products", "send_email"}
+		requireApproval := "never"
+		
+		tool := responses.ToolParamOfMcp(serverLabel, serverURL, allowedTools, requireApproval)
+		
+		if tool.OfMcp == nil {
+			t.Fatal("Expected OfMcp to be non-nil")
+		}
+		
+		mcp := tool.OfMcp
+		if mcp.ServerLabel != serverLabel {
+			t.Errorf("Expected ServerLabel to be %s, got %s", serverLabel, mcp.ServerLabel)
+		}
+		
+		if mcp.ServerURL != serverURL {
+			t.Errorf("Expected ServerURL to be %s, got %s", serverURL, mcp.ServerURL)
+		}
+		
+		if param.IsOmitted(mcp.AllowedTools) {
+			t.Error("Expected AllowedTools to be set")
+		} else {
+			if mcp.AllowedTools.OfMcpAllowedTools == nil {
+				t.Error("Expected OfMcpAllowedTools to be set")
+			} else {
+				tools := mcp.AllowedTools.OfMcpAllowedTools
+				if len(tools) != 2 || tools[0] != "search_products" || tools[1] != "send_email" {
+					t.Errorf("Expected allowedTools to be %v, got %v", allowedTools, tools)
+				}
+			}
+		}
+		
+		if param.IsOmitted(mcp.RequireApproval) {
+			t.Error("Expected RequireApproval to be set")
+		} else {
+			if param.IsOmitted(mcp.RequireApproval.OfMcpToolApprovalSetting) {
+				t.Error("Expected OfMcpToolApprovalSetting to be set")
+			} else {
+				if mcp.RequireApproval.OfMcpToolApprovalSetting.Value != requireApproval {
+					t.Errorf("Expected requireApproval to be %s, got %s", requireApproval, mcp.RequireApproval.OfMcpToolApprovalSetting.Value)
+				}
+			}
+		}
+	})
+	
+	// Test with empty allowedTools
+	t.Run("with empty allowed tools", func(t *testing.T) {
+		serverLabel := "test-server"
+		serverURL := "https://test-mcp-server.com"
+		var allowedTools []string // empty slice
+		requireApproval := "auto"
+		
+		tool := responses.ToolParamOfMcp(serverLabel, serverURL, allowedTools, requireApproval)
+		
+		if tool.OfMcp == nil {
+			t.Fatal("Expected OfMcp to be non-nil")
+		}
+		
+		mcp := tool.OfMcp
+		if !param.IsOmitted(mcp.AllowedTools) {
+			t.Error("Expected AllowedTools to be omitted when empty slice provided")
+		}
+		
+		if param.IsOmitted(mcp.RequireApproval) {
+			t.Error("Expected RequireApproval to be set")
+		}
+	})
+	
+	// Test with nil allowedTools
+	t.Run("with nil allowed tools", func(t *testing.T) {
+		serverLabel := "test-server"
+		serverURL := "https://test-mcp-server.com"
+		var allowedTools []string = nil // nil slice
+		requireApproval := "always"
+		
+		tool := responses.ToolParamOfMcp(serverLabel, serverURL, allowedTools, requireApproval)
+		
+		if tool.OfMcp == nil {
+			t.Fatal("Expected OfMcp to be non-nil")
+		}
+		
+		mcp := tool.OfMcp
+		if !param.IsOmitted(mcp.AllowedTools) {
+			t.Error("Expected AllowedTools to be omitted when nil slice provided")
+		}
+	})
+	
+	// Test with empty requireApproval
+	t.Run("with empty require approval", func(t *testing.T) {
+		serverLabel := "test-server"
+		serverURL := "https://test-mcp-server.com"
+		allowedTools := []string{"search_products"}
+		requireApproval := "" // empty string
+		
+		tool := responses.ToolParamOfMcp(serverLabel, serverURL, allowedTools, requireApproval)
+		
+		if tool.OfMcp == nil {
+			t.Fatal("Expected OfMcp to be non-nil")
+		}
+		
+		mcp := tool.OfMcp
+		if !param.IsOmitted(mcp.RequireApproval) {
+			t.Error("Expected RequireApproval to be omitted when empty string provided")
+		}
+		
+		if param.IsOmitted(mcp.AllowedTools) {
+			t.Error("Expected AllowedTools to be set")
+		}
+	})
+	
+	// Test minimal case (both optional parameters empty)
+	t.Run("minimal parameters", func(t *testing.T) {
+		serverLabel := "minimal-server"
+		serverURL := "https://minimal-server.com"
+		var allowedTools []string // empty
+		requireApproval := "" // empty
+		
+		tool := responses.ToolParamOfMcp(serverLabel, serverURL, allowedTools, requireApproval)
+		
+		if tool.OfMcp == nil {
+			t.Fatal("Expected OfMcp to be non-nil")
+		}
+		
+		mcp := tool.OfMcp
+		if mcp.ServerLabel != serverLabel {
+			t.Errorf("Expected ServerLabel to be %s, got %s", serverLabel, mcp.ServerLabel)
+		}
+		
+		if mcp.ServerURL != serverURL {
+			t.Errorf("Expected ServerURL to be %s, got %s", serverURL, mcp.ServerURL)
+		}
+		
+		if !param.IsOmitted(mcp.AllowedTools) {
+			t.Error("Expected AllowedTools to be omitted")
+		}
+		
+		if !param.IsOmitted(mcp.RequireApproval) {
+			t.Error("Expected RequireApproval to be omitted")
+		}
+	})
+}