diff --git a/packages/core/src/types/prompt_template.d.ts b/packages/core/src/types/prompt_template.d.ts
index b20dde4207..c7d19fb188 100644
--- a/packages/core/src/types/prompt_template.d.ts
+++ b/packages/core/src/types/prompt_template.d.ts
@@ -3845,7 +3845,7 @@ interface ShellOutput {
     stdout?: string
     stderr?: string
     exitCode: number
-    failed: boolean
+    failed?: boolean
 }
 
 interface BrowserOptions {