diff --git a/web/src/styles/session.css b/web/src/styles/session.css
index 71a8ddd7feea3e4f48d45a2b7f4e5645a1a88552..7c8672db925ac874e258db3eae95b48a6accbe92 100644
--- a/web/src/styles/session.css
+++ b/web/src/styles/session.css
@@ -46,7 +46,7 @@   border-left: 3px solid transparent;
   cursor: pointer;
 }
 
-[data-show-toolcalls="false"] .turn[data-tool="1"] { display: none; }
+[data-show-toolcalls="no"] .turn[data-tool="1"] { display: none; }
 
 .turn.user      { background: var(--turn-user); border-left-color: var(--ink-4); }
 .turn.assistant { background: var(--turn-asst); border-left-color: var(--accent); }