diff --git a/packages/core/src/tools/shell.test.ts b/packages/core/src/tools/shell.test.ts
index ad93ad873b..5f1bf1f534 100644
--- a/packages/core/src/tools/shell.test.ts
+++ b/packages/core/src/tools/shell.test.ts
@@ -687,13 +687,13 @@ describe('ShellTool', () => {
       expect(result.llmContent).not.toContain('Directory:');
     });
 
-    it('should not include Exit Code when command succeeds (exit code 0)', async () => {
+    it('should include Exit Code when command succeeds (exit code 0)', async () => {
       const invocation = shellTool.build({ command: 'echo hello' });
       const promise = invocation.execute(mockAbortSignal);
       resolveShellExecution({ output: 'hello', exitCode: 0 });
 
       const result = await promise;
-      expect(result.llmContent).not.toContain('<exit_code>');
+      expect(result.llmContent).toContain('<exit_code>0</exit_code>');
     });
 
     it('should include Exit Code when command fails (non-zero exit code)', async () => {
@@ -776,6 +776,7 @@ describe('ShellTool', () => {
       // Should only contain subprocess_result and output
       expect(result.llmContent).toContain('<subprocess_result>');
       expect(result.llmContent).toContain('<output>hello</output>');
+      expect(result.llmContent).toContain('<exit_code>0</exit_code>');
     });
   });
 
diff --git a/packages/core/src/tools/shell.ts b/packages/core/src/tools/shell.ts
index 15ef55be8d..185c176593 100644
--- a/packages/core/src/tools/shell.ts
+++ b/packages/core/src/tools/shell.ts
@@ -365,7 +365,7 @@ export class ShellToolInvocation extends BaseToolInvocation<
           parts.push(`<error>${finalError}</error>`);
         }
 
-        if (result.exitCode !== null && result.exitCode !== 0) {
+        if (result.exitCode !== null) {
           parts.push(`<exit_code>${result.exitCode}</exit_code>`);
         }