diff --git a/backend/internal/pkg/antigravity/gemini_types.go b/backend/internal/pkg/antigravity/gemini_types.go
index 033dccbd5d..4fd7882adc 100644
--- a/backend/internal/pkg/antigravity/gemini_types.go
+++ b/backend/internal/pkg/antigravity/gemini_types.go
@@ -112,7 +112,8 @@ type GeminiImageSearch struct {
 
 // GeminiToolConfig Gemini 工具配置
 type GeminiToolConfig struct {
-	FunctionCallingConfig *GeminiFunctionCallingConfig `json:"functionCallingConfig,omitempty"`
+	FunctionCallingConfig            *GeminiFunctionCallingConfig `json:"functionCallingConfig,omitempty"`
+	IncludeServerSideToolInvocations *bool                        `json:"includeServerSideToolInvocations,omitempty"`
 }
 
 // GeminiFunctionCallingConfig 函数调用配置
diff --git a/backend/internal/pkg/antigravity/request_transformer_test.go b/backend/internal/pkg/antigravity/request_transformer_test.go
index ea95cc7ea6..008e54724a 100644
--- a/backend/internal/pkg/antigravity/request_transformer_test.go
+++ b/backend/internal/pkg/antigravity/request_transformer_test.go
@@ -565,3 +565,27 @@ func TestTransformClaudeToGeminiWithOptions_PreservesWebSearchAlongsideFunctions
 	require.Equal(t, "get_weather", req.Request.Tools[0].FunctionDeclarations[0].Name)
 	require.NotNil(t, req.Request.Tools[1].GoogleSearch)
 }
+
+func TestGeminiToolConfig_IncludeServerSideToolInvocations(t *testing.T) {
+	t.Run("serialize and deserialize toolConfig with includeServerSideToolInvocations", func(t *testing.T) {
+		trueVal := true
+		cfg := GeminiToolConfig{
+			FunctionCallingConfig: &GeminiFunctionCallingConfig{
+				Mode: "VALIDATED",
+			},
+			IncludeServerSideToolInvocations: &trueVal,
+		}
+
+		data, err := json.Marshal(cfg)
+		require.NoError(t, err)
+		require.Contains(t, string(data), `"includeServerSideToolInvocations":true`)
+
+		var decoded GeminiToolConfig
+		err = json.Unmarshal(data, &decoded)
+		require.NoError(t, err)
+		require.NotNil(t, decoded.IncludeServerSideToolInvocations)
+		require.True(t, *decoded.IncludeServerSideToolInvocations)
+		require.Equal(t, "VALIDATED", decoded.FunctionCallingConfig.Mode)
+	})
+}
+