diff --git a/src/tool_schemas.py b/src/tool_schemas.py
index 7585f3e9d..865c3eb91 100644
--- a/src/tool_schemas.py
+++ b/src/tool_schemas.py
@@ -64,7 +64,7 @@ FUNCTION_TOOL_SCHEMAS = [
         "type": "function",
         "function": {
             "name": "web_search",
-            "description": "Quick single web lookup for a fact or current event mid-task. NOT for 'research X' / 'do research on X' — those are deep-research jobs; use trigger_research instead.",
+            "description": "Quick single web lookup for a fact or current event mid-task, when you do NOT already know which page to read. NOT when the user hands you a URL — fetch that page with web_fetch instead of searching for it. NOT for 'research X' / 'do research on X' — those are deep-research jobs; use trigger_research instead.",
             "parameters": {
                 "type": "object",
                 "properties": {