diff --git a/CLAUDE.md b/CLAUDE.md
index f95bb927..68e7b155 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -77,15 +77,17 @@ Only update CLAUDE.md if you have **genuinely reusable knowledge** that would he
 - Keep changes focused and minimal
 - Follow existing code patterns
 
-## Browser Testing (If Available)
+## Browser Testing (Required for Frontend Stories)
 
-For any story that changes UI, verify it works in the browser if you have browser testing tools configured (e.g., via MCP):
+For any story that changes UI, you MUST verify it works in the browser:
 
-1. Navigate to the relevant page
-2. Verify the UI changes work as expected
-3. Take a screenshot if helpful for the progress log
+1. Load the `dev-browser` skill
+2. Navigate to the relevant page
+3. Verify the UI changes work as expected
+4. Also verify that ALL other pages/routes still work (no 404s, no broken navigation)
+5. Take a screenshot if helpful for the progress log
 
-If no browser tools are available, note in your progress report that manual browser verification is needed.
+A frontend story is NOT complete until browser verification passes.
 
 ## Stop Condition
 
diff --git a/prompt.md b/prompt.md
index cdebe901..66bbd7d8 100644
--- a/prompt.md
+++ b/prompt.md
@@ -87,7 +87,8 @@ For any story that changes UI, you MUST verify it works in the browser:
 1. Load the `dev-browser` skill
 2. Navigate to the relevant page
 3. Verify the UI changes work as expected
-4. Take a screenshot if helpful for the progress log
+4. Also verify that ALL other pages/routes still work (no 404s, no broken navigation)
+5. Take a screenshot if helpful for the progress log
 
 A frontend story is NOT complete until browser verification passes.