diff --git a/src/hooks/delegate-task-retry/hook.ts b/src/hooks/delegate-task-retry/hook.ts
index 915da323d8..97e27b3f4c 100644
--- a/src/hooks/delegate-task-retry/hook.ts
+++ b/src/hooks/delegate-task-retry/hook.ts
@@ -10,6 +10,7 @@ export function createDelegateTaskRetryHook(_ctx: PluginInput) {
       output: { title: string; output: string; metadata: unknown }
     ) => {
       if (input.tool.toLowerCase() !== "task") return
+      if (typeof output.output !== "string") return
 
       const errorInfo = detectDelegateTaskError(output.output)
       if (errorInfo) {
diff --git a/src/hooks/edit-error-recovery/hook.ts b/src/hooks/edit-error-recovery/hook.ts
index 84ac9e9dcd..d71540bee8 100644
--- a/src/hooks/edit-error-recovery/hook.ts
+++ b/src/hooks/edit-error-recovery/hook.ts
@@ -43,6 +43,7 @@ export function createEditErrorRecoveryHook(_ctx: PluginInput) {
       output: { title: string; output: string; metadata: unknown }
     ) => {
       if (input.tool.toLowerCase() !== "edit") return
+      if (typeof output.output !== "string") return
 
       const outputLower = output.output.toLowerCase()
       const hasEditError = EDIT_ERROR_PATTERNS.some((pattern) =>