diff --git a/packages/cli/src/acp-integration/session/Session.test.ts b/packages/cli/src/acp-integration/session/Session.test.ts
index 91a03d6381..af2d283dc3 100644
--- a/packages/cli/src/acp-integration/session/Session.test.ts
+++ b/packages/cli/src/acp-integration/session/Session.test.ts
@@ -28500,7 +28500,7 @@ describe('Session', () => {
       });
     });
 
-    it('drops repeated duplicate provider functionCall ids after the first synthetic response', async () => {
+    it('records repeated duplicate provider calls without returning results', async () => {
       const execute = vi.fn().mockResolvedValue({
         llmContent: 'should not run',
         returnDisplay: 'should not run',
@@ -28529,6 +28529,7 @@ describe('Session', () => {
           ],
         ]),
       );
+      const usedIds = new Set(['shell_1']);
       const [duplicatePart] = core.normalizeModelToolCallIds(
         [
           {
@@ -28539,7 +28540,7 @@ describe('Session', () => {
             },
           },
         ],
-        new Set(['shell_1']),
+        usedIds,
         new Set<string>(),
       );
       const duplicateCall = duplicatePart.functionCall!;
@@ -28549,6 +28550,19 @@ describe('Session', () => {
       ).runToolCalls(new AbortController().signal, 'prompt-history-dup', [
         duplicateCall,
       ]);
+      const [repeatedPart] = core.normalizeModelToolCallIds(
+        [
+          {
+            functionCall: {
+              id: 'shell_1',
+              name: 'read_file',
+              args: { file_path: 'b.ts' },
+            },
+          },
+        ],
+        usedIds,
+        new Set<string>(),
+      );
       const toolLoopState: DaemonToolLoopState = {
         totalToolCalls: 0,
         invalidToolParamErrors: new Map<string, number>(),
@@ -28558,13 +28572,14 @@ describe('Session', () => {
         repeatedToolFailureMode: 'off',
         repeatedToolFailureState: createRepeatedToolFailureGuardState(),
       };
+      expect(repeatedPart.functionCall?.id).toBe('shell_1__qwen_dup_3');
       const secondResult = await (
         session as unknown as ToolCallInternals
       ).runToolCalls(
         new AbortController().signal,
         'prompt-history-dup',
         [
-          duplicateCall,
+          repeatedPart.functionCall!,
           { id: 'fresh_shell', name: 'read_file', args: { file_path: 'c.ts' } },
         ],
         toolLoopState,
@@ -28589,9 +28604,39 @@ describe('Session', () => {
         core.LoopType.GLOBAL_TOOL_CALL_DUPLICATE,
       );
       expect(mockChatRecordingService.recordToolResult).toHaveBeenCalledTimes(
-        1,
+        3,
       );
-      expect(mockClient.sessionUpdate).toHaveBeenCalledTimes(1);
+      expect(
+        mockChatRecordingService.recordToolResult.mock.calls
+          .slice(1)
+          .map(([parts, metadata]) => ({
+            callId: metadata.callId,
+            responseId: parts[0]?.functionResponse?.id,
+            error: parts[0]?.functionResponse?.response?.['error'],
+            status: metadata.status,
+            executionStatus: metadata.executionStatus,
+          })),
+      ).toEqual([
+        {
+          callId: 'shell_1__qwen_dup_3',
+          responseId: 'shell_1__qwen_dup_3',
+          error: expect.stringContaining(
+            'loop detection stopped the current turn',
+          ),
+          status: 'error',
+          executionStatus: 'not_started',
+        },
+        {
+          callId: 'fresh_shell',
+          responseId: 'fresh_shell',
+          error: expect.stringContaining(
+            'loop detection stopped the current turn',
+          ),
+          status: 'error',
+          executionStatus: 'not_started',
+        },
+      ]);
+      expect(mockClient.sessionUpdate).toHaveBeenCalledTimes(3);
     });
 
     it('suppresses duplicate TodoWrite calls without emitting plan updates', async () => {
diff --git a/packages/cli/src/acp-integration/session/Session.ts b/packages/cli/src/acp-integration/session/Session.ts
index c60c5998bd..712b399fa2 100644
--- a/packages/cli/src/acp-integration/session/Session.ts
+++ b/packages/cli/src/acp-integration/session/Session.ts
@@ -9055,11 +9055,22 @@ export class Session implements SessionContext {
       } else {
         debugLogger.warn(message);
       }
-      return await finalizeRunToolResult({
+      await Promise.all(
+        dedupedFunctionCalls.map((fc) =>
+          recordSkippedToolCall(
+            fc,
+            LOOP_DETECTED_SKIP_MESSAGE,
+            false,
+            ToolErrorType.UNKNOWN,
+          ),
+        ),
+      );
+      const result = await finalizeRunToolResult({
         parts: [],
         stopAfterPermissionCancel: false,
         loopDetected: true,
       });
+      return { ...result, parts: [] };
     }
 
     const pushDuplicateBatch = (