diff --git a/src-tauri/src/proxy/mappers/claude/request.rs b/src-tauri/src/proxy/mappers/claude/request.rs
index c2447486a..a4a677a93 100644
--- a/src-tauri/src/proxy/mappers/claude/request.rs
+++ b/src-tauri/src/proxy/mappers/claude/request.rs
@@ -1723,13 +1723,6 @@ fn build_tools(
 
         let mut tool_list = Vec::new();
 
-        // [优化] Gemini 2.0+ 及 3.0 系列模型通常支持混合工具调用 (Function Calling + Google Search)
-        // 只有针对老旧模型或特定受限环境才需要互斥。
-        let model_lower = mapped_model.to_lowercase();
-        let supports_mixed_tools = model_lower.contains("gemini-2.0")
-            || model_lower.contains("gemini-2.5")
-            || model_lower.contains("gemini-3");
-
         if !function_declarations.is_empty() {
             let mut func_obj = serde_json::Map::new();
             func_obj.insert(
@@ -1739,21 +1732,13 @@ fn build_tools(
             tool_list.push(json!(func_obj));
 
             if has_google_search {
-                if supports_mixed_tools {
-                    tracing::info!(
-                        "[Claude-Request] Enabling MIXED tool calling for {}: Function Calling + Google Search.",
-                        mapped_model
-                    );
-                    let mut search_obj = serde_json::Map::new();
-                    search_obj.insert("googleSearch".to_string(), json!({}));
-                    tool_list.push(json!(search_obj));
-                } else {
-                    tracing::info!(
-                        "[Claude-Request] Skipping googleSearch injection for {} due to existing function declarations. \
-                         Older Gemini models may not support mixed tool types.",
-                        mapped_model
-                    );
-                }
+                // [FIX] cloudcode-pa (v1internal) rejects googleSearch combined with
+                // functionDeclarations and ignores tool_config.includeServerSideToolInvocations
+                // (verified upstream 400). Never mix: drop googleSearch when function tools exist.
+                tracing::info!(
+                    "[Claude-Request] Skipping googleSearch injection for {}: function declarations present (v1internal cannot mix built-in + function tools).",
+                    mapped_model
+                );
             }
         } else if has_google_search {
             let mut search_obj = serde_json::Map::new();
@@ -3005,9 +2990,9 @@ mod tests {
     }
 
     #[test]
-    fn test_mixed_tools_injection_for_gemini_2_0() {
-        // [场景] 使用 Gemini 2.0 模型，同时提供自定义工具和启用全网搜索
-        // 期望: 转换后的请求应同时包含 googleSearch 和 functionDeclarations
+    fn test_no_mixed_tools_for_gemini_2_0() {
+        // [场景] Gemini 2.0 模型, 同时提供自定义工具和 web search
+        // 期望: v1internal 无法混合, googleSearch 被丢弃, 仅保留 functionDeclarations
         let req = ClaudeRequest {
             model: "claude-sonnet-4-6".to_string(), // 映射到 gemini-2.0-flash-exp
             messages: vec![Message {
@@ -3054,13 +3039,10 @@ mod tests {
             .any(|t| t.get("functionDeclarations").is_some());
 
         assert!(
-            has_google_search,
-            "Gemini 2.0 should support mixed Google Search"
-        );
-        assert!(
-            has_functions,
-            "Gemini 2.0 should support mixed function declarations"
+            !has_google_search,
+            "v1internal cannot mix googleSearch with functionDeclarations; googleSearch must be dropped"
         );
+        assert!(has_functions, "function declarations must be preserved");
     }
 
     #[test]
diff --git a/src-tauri/src/proxy/mappers/common_utils.rs b/src-tauri/src/proxy/mappers/common_utils.rs
index 904b635f1..dd85678b1 100644
--- a/src-tauri/src/proxy/mappers/common_utils.rs
+++ b/src-tauri/src/proxy/mappers/common_utils.rs
@@ -79,7 +79,7 @@ pub fn resolve_request_config(
     // 检测是否有联网工具定义 (内置功能调用)
     let has_networking_tool = detects_networking_tool(tools);
     // 检测是否包含非联网工具 (如 MCP 本地工具)
-    let _has_non_networking = contains_non_networking_tool(tools);
+    let has_non_networking = contains_non_networking_tool(tools);
 
     // Strip -online suffix from original model if present (to detect networking intent)
     let is_online_suffix = original_model.ends_with("-online");
@@ -101,7 +101,11 @@ pub fn resolve_request_config(
     // Determine if we should enable networking
     // [FIX] 禁用基于模型的自动联网逻辑，防止图像请求被联网搜索结果覆盖。
     // 仅在用户显式请求联网时启用：1) -online 后缀 2) 携带联网工具定义
-    let enable_networking = is_online_suffix || has_networking_tool;
+    // [FIX] cloudcode-pa (v1internal) rejects googleSearch mixed with functionDeclarations
+    // and does NOT honor tool_config.includeServerSideToolInvocations (verified: upstream
+    // returns HTTP 400 even with the flag set). So when real (non-networking) function tools
+    // are present, stay in agent mode rather than entering web-search mode and 400-ing.
+    let enable_networking = (is_online_suffix || has_networking_tool) && !has_non_networking;
 
     // The final model to send upstream should be the MAPPED model,
     // but if searching, we MUST ensure the model name is one the backend associates with search.
@@ -605,6 +609,30 @@ mod tests {
         assert!(!config.inject_google_search);
     }
 
+    #[test]
+    fn test_networking_disabled_when_function_tools_present() {
+        // A coding/function tool present alongside a web_search tool: v1internal cannot mix,
+        // so networking must stay off (agent mode) instead of injecting googleSearch.
+        let tools = Some(vec![
+            json!({ "name": "get_weather" }),
+            json!({ "name": "web_search" }),
+        ]);
+        let config =
+            resolve_request_config("gemini-3-flash", "gemini-3-flash", &tools, None, None, None, None);
+        assert_eq!(config.request_type, "agent");
+        assert!(!config.inject_google_search);
+    }
+
+    #[test]
+    fn test_networking_enabled_for_pure_web_search() {
+        // Only a web_search tool (no other function tools): networking should be enabled.
+        let tools = Some(vec![json!({ "name": "web_search" })]);
+        let config =
+            resolve_request_config("gemini-3-flash", "gemini-3-flash", &tools, None, None, None, None);
+        assert!(config.inject_google_search);
+        assert_eq!(config.request_type, "web_search");
+    }
+
     #[test]
     fn test_image_model_excluded() {
         let config = resolve_request_config(
diff --git a/src-tauri/src/proxy/mappers/gemini/wrapper.rs b/src-tauri/src/proxy/mappers/gemini/wrapper.rs
index 57422283b..54b462ac4 100644
--- a/src-tauri/src/proxy/mappers/gemini/wrapper.rs
+++ b/src-tauri/src/proxy/mappers/gemini/wrapper.rs
@@ -1193,8 +1193,8 @@ mod tests {
 
         assert!(has_functions, "Should contain functionDeclarations");
         assert!(
-            has_google_search,
-            "Should contain googleSearch (Gemini 2.0+ supports mixed tools)"
+            !has_google_search,
+            "v1internal cannot mix; googleSearch must not be injected when functionDeclarations exist"
         );
     }
 }
diff --git a/src-tauri/src/proxy/mappers/openai/request.rs b/src-tauri/src/proxy/mappers/openai/request.rs
index 65ee6b736..f8a6bec53 100644
--- a/src-tauri/src/proxy/mappers/openai/request.rs
+++ b/src-tauri/src/proxy/mappers/openai/request.rs
@@ -1268,8 +1268,8 @@ mod tests {
 
         assert!(has_functions, "Should contain functionDeclarations");
         assert!(
-            has_google_search,
-            "Should contain googleSearch (Gemini 2.0+ supports mixed tools)"
+            !has_google_search,
+            "function tools present: networking disabled, googleSearch must not be injected"
         );
     }
 }