fix(prompt_templates): keep argument content out of the repair warning

parse_tool_call_arguments logged up to 200 characters of the original
arguments when it repaired truncated JSON. That warning is written even
when message logging is turned off, so tool arguments with personal or
confidential data could reach the logs. Log only the tool name, context
and length.

litellm/litellm_core_utils/prompt_templates/common_utils.py

@@ -3261,12 +3261,10 @@ def parse_tool_call_arguments(
         repaired: Final = _attempt_json_repair(arguments)
         if repaired is not None:
             verbose_logger.warning(
-                "Repaired truncated tool call arguments for tool '%s' (%s). Original (%d chars): %.200s%s",
+                "Repaired truncated tool call arguments for tool '%s' (%s). Original length: %d chars",
                 tool_name or "<unknown>",
                 context or "unknown context",
                 len(arguments),
-                arguments,
-                "..." if len(arguments) > 200 else "",
             )
             return repaired
 

tests/unit/litellm_core_utils/prompt_templates/test_litellm_core_utils_prompt_templates_common_utils.py

@@ -297,6 +297,20 @@ def test_parse_tool_call_arguments_rejects_concatenated_json() -> None:
         parse_tool_call_arguments('{"a":1}{"b":2}')
 
 
+def test_parse_tool_call_arguments_repair_warning_omits_argument_content() -> None:
+    from unittest.mock import patch
+
+    secret: Final = "patient-record-4471"
+    with patch("litellm.litellm_core_utils.prompt_templates.common_utils.verbose_logger") as logger:
+        result: Final = parse_tool_call_arguments('{"note": "' + secret + '"', tool_name="save_note", context="test")
+
+    assert result == {"note": secret}
+    logger.warning.assert_called_once()
+    logged: Final = " ".join(str(arg) for arg in logger.warning.call_args.args)
+    assert "save_note" in logged
+    assert secret not in logged
+
+
 def _distinct_json_objects(count: int) -> str:
     return "".join(json.dumps({"n": index}, separators=(",", ":")) for index in range(count))