diff --git a/packages/model-runtime/src/core/openaiCompatibleFactory/index.test.ts b/packages/model-runtime/src/core/openaiCompatibleFactory/index.test.ts
index 71a1ead6b4..fc2d724342 100644
--- a/packages/model-runtime/src/core/openaiCompatibleFactory/index.test.ts
+++ b/packages/model-runtime/src/core/openaiCompatibleFactory/index.test.ts
@@ -3173,9 +3173,9 @@ describe('LobeOpenAICompatibleFactory', () => {
           { headers: undefined, signal: undefined },
         );
 
-        expect(result).toEqual([
-          { arguments: { age: 28, name: 'Alice' }, name: 'person_extractor' },
-        ]);
+        // The fallback returns the parsed schema object, same shape as the
+        // json_schema path
+        expect(result).toEqual({ age: 28, name: 'Alice' });
       });
 
       it('should not forward internal thinking to generic OpenAI-compatible generateObject requests', async () => {
@@ -3255,7 +3255,10 @@ describe('LobeOpenAICompatibleFactory', () => {
 
         const result = await instanceWithToolCalling.generateObject(payload);
 
-        expect(consoleSpy).toHaveBeenCalledWith('parse tool call arguments error:', undefined);
+        expect(consoleSpy).toHaveBeenCalledWith(
+          'no tool call found in structured output response:',
+          mockResponse.choices[0].message,
+        );
         expect(result).toBeUndefined();
 
         consoleSpy.mockRestore();
@@ -3298,7 +3301,7 @@ describe('LobeOpenAICompatibleFactory', () => {
 
         expect(consoleSpy).toHaveBeenCalledWith(
           'parse tool call arguments error:',
-          mockResponse.choices[0].message.tool_calls,
+          mockResponse.choices[0].message.tool_calls[0],
         );
         expect(result).toBeUndefined();
 
@@ -3350,7 +3353,7 @@ describe('LobeOpenAICompatibleFactory', () => {
           { headers: options.headers, signal: options.signal },
         );
 
-        expect(result).toEqual([{ arguments: { data: 'test' }, name: 'data_extractor' }]);
+        expect(result).toEqual({ data: 'test' });
       });
     });
   });
diff --git a/packages/model-runtime/src/core/openaiCompatibleFactory/index.ts b/packages/model-runtime/src/core/openaiCompatibleFactory/index.ts
index 31d768bef2..5e9aadaf49 100644
--- a/packages/model-runtime/src/core/openaiCompatibleFactory/index.ts
+++ b/packages/model-runtime/src/core/openaiCompatibleFactory/index.ts
@@ -898,7 +898,9 @@ export const createOpenAICompatibleRuntime = <T extends Record<string, any> = an
         toolCalls?.find((item) => item.function?.name === tool.function.name) ?? toolCalls?.[0];
 
       if (!toolCall?.function) {
-        log('no tool call found in structured output response');
+        // tool_choice forces this function, so a missing tool call means the
+        // provider misbehaved — surface it instead of silently returning undefined
+        console.error('no tool call found in structured output response:', res.choices[0]?.message);
         return undefined;
       }