diff --git a/openai/assistant_resource_test.go b/openai/assistant_resource_test.go
index faebeaf..e7b1f08 100644
--- a/openai/assistant_resource_test.go
+++ b/openai/assistant_resource_test.go
@@ -8,6 +8,48 @@ import (
 	"github.com/hashicorp/terraform-plugin-testing/helper/resource"
 )
 
+func TestAccAssistantResource_tool_simple(t *testing.T) {
+	rName := acctest.RandomWithPrefix("openai_tf_test_")
+	assistantResourceName := "openai_assistant.test"
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:                 func() { testAccPreCheck(t) },
+		ProtoV6ProviderFactories: testAccProtoV6ProviderFactories,
+		Steps: []resource.TestStep{
+			// Create and Read testing
+			{
+				Config: testAccAssistantResourceConfig_tool_simple(rName, "test description"),
+				Check: resource.ComposeAggregateTestCheckFunc(
+					resource.TestCheckResourceAttrSet(assistantResourceName, "id"),
+					resource.TestCheckResourceAttr(assistantResourceName, "name", rName),
+					resource.TestCheckResourceAttr(assistantResourceName, "description", "test description"),
+					resource.TestCheckResourceAttr(assistantResourceName, "model", "gpt-4"),
+					resource.TestCheckResourceAttr(assistantResourceName, "instructions", "You are a personal math tutor. When asked a question, write and run Python code to answer the question."),
+				),
+			},
+			// Update and Read testing
+			{
+				Config: testAccAssistantResourceConfig_tool_simple(rName, "test description updated"),
+				Check: resource.ComposeAggregateTestCheckFunc(
+					resource.TestCheckResourceAttr(assistantResourceName, "description", "test description updated"),
+				),
+			},
+			// ImportState testing
+			{
+				ResourceName:      assistantResourceName,
+				ImportState:       true,
+				ImportStateVerify: true,
+				// This is not normally necessary, but is here because this
+				// example code does not have an actual upstream service.
+				// Once the Read method is able to refresh information from
+				// the upstream service, this can be removed.
+				// ImportStateVerifyIgnore: []string{"wait"},
+			},
+			// Delete testing automatically occurs in TestCase
+		},
+	})
+}
+
 func TestAccAssistantResource_tool_code_interpreter(t *testing.T) {
 	rName := acctest.RandomWithPrefix("openai_tf_test_")
 	assistantResourceName := "openai_assistant.test"
@@ -176,6 +218,17 @@ func TestAccAssistantResource_complex(t *testing.T) {
 	})
 }
 
+func testAccAssistantResourceConfig_tool_simple(rName string, description string) string {
+	return fmt.Sprintf(`	
+resource openai_assistant test {
+	name = %[1]q
+	description = %[2]q
+	model = "gpt-4"
+	instructions = "You are a personal math tutor. When asked a question, write and run Python code to answer the question."
+}
+`, rName, description)
+}
+
 func testAccAssistantResourceConfig_tool_code_interpreter(filename string, rName string, description string) string {
 	return fmt.Sprintf(`	
 resource openai_file test {
diff --git a/openai/models.go b/openai/models.go
index fef9cdc..b6fe3db 100644
--- a/openai/models.go
+++ b/openai/models.go
@@ -238,31 +238,35 @@ func NewOpenAIAssistantResourceModel(ctx context.Context, assistant *openai.Assi
 		model.Metadata, _ = types.MapValueFrom(ctx, types.StringType, assistant.MetaData)
 	}
 
-	var tools = make([]OpenAIAssistantToolModel, len(assistant.Tools))
-	for i, t := range assistant.Tools {
-		tool := OpenAIAssistantToolModel{
-			Type: types.StringValue(t.Type),
-		}
-
-		if t.Function != nil {
-			parameters, err := json.Marshal(t.Function.Parameters)
-			if err != nil {
-				return model, diags
-			}
-			f := OpenAIAssistantToolFunctionModel{
-				Name:       types.StringValue(t.Function.Name),
-				Parameters: types.StringValue(string(parameters)),
+	if len(assistant.Tools) == 0 {
+		model.Tools = types.ListNull(types.ObjectType{AttrTypes: OpenAIAssistantToolModel{}.AttrTypes()})
+	} else {
+		var tools = make([]OpenAIAssistantToolModel, len(assistant.Tools))
+		for i, t := range assistant.Tools {
+			tool := OpenAIAssistantToolModel{
+				Type: types.StringValue(t.Type),
 			}
-			if t.Function.Description != nil {
-				f.Description = types.StringPointerValue(t.Function.Description)
+
+			if t.Function != nil {
+				parameters, err := json.Marshal(t.Function.Parameters)
+				if err != nil {
+					return model, diags
+				}
+				f := OpenAIAssistantToolFunctionModel{
+					Name:       types.StringValue(t.Function.Name),
+					Parameters: types.StringValue(string(parameters)),
+				}
+				if t.Function.Description != nil {
+					f.Description = types.StringPointerValue(t.Function.Description)
+				}
+				tool.Function = &f
 			}
-			tool.Function = &f
+			tools[i] = tool
+		}
+		model.Tools, diags = types.ListValueFrom(ctx, types.ObjectType{AttrTypes: OpenAIAssistantToolModel{}.AttrTypes()}, tools)
+		if diags.HasError() {
+			return model, diags
 		}
-		tools[i] = tool
-	}
-	model.Tools, diags = types.ListValueFrom(ctx, types.ObjectType{AttrTypes: OpenAIAssistantToolModel{}.AttrTypes()}, tools)
-	if diags.HasError() {
-		return model, diags
 	}
 
 	if assistant.ToolResources != nil && (assistant.ToolResources.CodeInterpreter != nil || assistant.ToolResources.FileSearch != nil) {