fix ask-user choices across reloads (#4669)

src/tool_schemas.py

@@ -467,7 +467,7 @@ FUNCTION_TOOL_SCHEMAS = [
                     "question": {"type": "string", "description": "The question to ask. Be specific and self-contained."},
                     "options": {
                         "type": "array",
-                        "description": "2-6 mutually exclusive choices. Each is an object with a short `label` and an optional `description` explaining the trade-off.",
+                        "description": "2-6 choices. Each is an object with a short `label` and an optional `description` explaining the trade-off.",
                         "items": {
                             "type": "object",
                             "properties": {
@@ -477,7 +477,7 @@ FUNCTION_TOOL_SCHEMAS = [
                             "required": ["label"]
                         }
                     },
-                    "multi": {"type": "boolean", "description": "Set true to let the user select multiple options instead of one. Default false."}
+                    "multi": {"type": "boolean", "description": "Set true ONLY when the question explicitly allows choosing more than one option. Otherwise omit it or set false. Default false."}
                 },
                 "required": ["question", "options"]
             }
@@ -1406,6 +1406,12 @@ def function_call_to_tool_block(name: str, arguments: str) -> Optional[ToolBlock
         content = json.dumps(args)
     elif tool_type == "ask_teacher":
         content = args.get("model", "auto") + "\n" + args.get("problem", "")
+    elif tool_type == "ask_user":
+        # Keep user-facing labels readable in the tool trace.  The outer SSE
+        # JSON encoder will escape them for transport and JSON.parse restores
+        # them once; pre-escaping here caused literal ``\u00f1`` sequences to
+        # remain visible in the debug panel.
+        content = json.dumps(args, ensure_ascii=False)
     else:
         content = json.dumps(args)