diff --git a/static/ui.js b/static/ui.js
index 8fd37a782..45252c980 100644
--- a/static/ui.js
+++ b/static/ui.js
@@ -12908,7 +12908,8 @@ function _toolResultOneLiner(preview){
   const first=preview.split('\n').find(l=>l.trim())||'';
   const trimmed=first.trim();
   if(!trimmed) return '';
-  if(trimmed[0]==='{'||trimmed[0]==='[') return '';
+  if(trimmed[0]==='{') return '';
+  if(trimmed[0]==='['){try{JSON.parse(trimmed);return '';}catch(e){/* not JSON */}}
   return trimmed.length>180?trimmed.slice(0,177)+'…':trimmed;
 }
 function _toolCardPreviewText(tc, displaySnippet){
diff --git a/tests/test_issue4752_collapsed_card_shows_result.py b/tests/test_issue4752_collapsed_card_shows_result.py
index 3cb2e6f5c..c1ec8e9df 100644
--- a/tests/test_issue4752_collapsed_card_shows_result.py
+++ b/tests/test_issue4752_collapsed_card_shows_result.py
@@ -99,6 +99,9 @@ class TestToolResultOneLiner:
     def test_json_array_suppressed(self):
         assert _result_one_liner('[1,2,3]') == ""
 
+    def test_bracket_prefixed_non_json_shown(self):
+        assert _result_one_liner('[INFO] 3 files created') == "[INFO] 3 files created"
+
     def test_multiline_collapses_to_first_nonempty_line(self):
         assert _result_one_liner("Line 1\nLine 2\nLine 3") == "Line 1"