diff --git a/docs/AGENTS.md b/docs/AGENTS.md
index 7bd91d7672..a2e05e0784 100644
--- a/docs/AGENTS.md
+++ b/docs/AGENTS.md
@@ -72,6 +72,7 @@ Avoid mock-heavy tests that verify implementation details rather than behavior.
 
 - Prefer full-app stories (`App.stories.tsx`) to isolated component stories. This tests components in their real context with proper providers, state management, and styling.
 - Use play functions with `@storybook/test` utilities (`within`, `userEvent`, `waitFor`) to interact with the UI and set up the desired visual state. Do not add props to production components solely for storybook convenience.
+- Keep story data deterministic: avoid `Math.random()`, `Date.now()`, or other non-deterministic values in story setup. Pass explicit values when ordering or timing matters for visual stability.
 
 ### TDD Expectations
 
diff --git a/src/browser/stories/App.reviews.stories.tsx b/src/browser/stories/App.reviews.stories.tsx
index 77f820ac74..e37c608e45 100644
--- a/src/browser/stories/App.reviews.stories.tsx
+++ b/src/browser/stories/App.reviews.stories.tsx
@@ -168,6 +168,8 @@ export const BulkReviewActions: AppStory = {
       setup={() => {
         const workspaceId = "ws-bulk-reviews";
 
+        // Use deterministic timestamps so reviews render in stable order
+        const baseTime = 1700000000000;
         setReviews(workspaceId, [
           // Attached reviews - shown in ChatInput with "Clear all" button
           createReview(
@@ -175,21 +177,24 @@ export const BulkReviewActions: AppStory = {
             "src/api/auth.ts",
             "42-48",
             "Consider using a constant for the token expiry",
-            "attached"
+            "attached",
+            baseTime + 1
           ),
           createReview(
             "review-attached-2",
             "src/utils/helpers.ts",
             "15-20",
             "This function could be simplified using reduce",
-            "attached"
+            "attached",
+            baseTime + 2
           ),
           createReview(
             "review-attached-3",
             "src/hooks/useAuth.ts",
             "30-35",
             "Missing error handling for network failures",
-            "attached"
+            "attached",
+            baseTime + 3
           ),
           // Pending reviews - shown in banner with "Attach all to chat" button
           createReview(
@@ -197,21 +202,24 @@ export const BulkReviewActions: AppStory = {
             "src/components/LoginForm.tsx",
             "55-60",
             "Add loading state while authenticating",
-            "pending"
+            "pending",
+            baseTime + 4
           ),
           createReview(
             "review-pending-2",
             "src/services/api.ts",
             "12-18",
             "Consider adding retry logic for failed requests",
-            "pending"
+            "pending",
+            baseTime + 5
           ),
           createReview(
             "review-pending-3",
             "src/types/user.ts",
             "5-10",
             "Make email field optional for guest users",
-            "pending"
+            "pending",
+            baseTime + 6
           ),
         ]);
 
diff --git a/src/browser/stories/storyHelpers.ts b/src/browser/stories/storyHelpers.ts
index 09cb81d50c..02826ec95e 100644
--- a/src/browser/stories/storyHelpers.ts
+++ b/src/browser/stories/storyHelpers.ts
@@ -76,7 +76,8 @@ export function createReview(
   filePath: string,
   lineRange: string,
   note: string,
-  status: "pending" | "attached" | "checked" = "pending"
+  status: "pending" | "attached" | "checked" = "pending",
+  createdAt?: number
 ): Review {
   return {
     id,
@@ -87,7 +88,7 @@ export function createReview(
       userNote: note,
     },
     status,
-    createdAt: Date.now() - Math.random() * 3600000, // Random time in last hour
+    createdAt: createdAt ?? Date.now(),
     statusChangedAt: status === "checked" ? Date.now() : undefined,
   };
 }