diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_session_v2.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_session_v2.rs
index d22f2bbcc..460c69009 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_session_v2.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_session_v2.rs
@@ -817,7 +817,7 @@ fn build_provider_request_v2(
         .with_max_output_tokens(16_384)
         .with_request_timeout_ms(llm.request_timeout_ms)
         .with_function_tools(planning_v2_function_tools())
-        .with_tool_choice(platform_llm::LlmToolChoice::Auto);
+        .with_tool_choice(platform_llm::LlmToolChoice::Required);
     apply_game_creator_llm_reasoning_effort(request, llm)
 }