diff --git a/libs/oci/langchain_oci/chat_models/oci_generative_ai.py b/libs/oci/langchain_oci/chat_models/oci_generative_ai.py
index bd38516..d812543 100644
--- a/libs/oci/langchain_oci/chat_models/oci_generative_ai.py
+++ b/libs/oci/langchain_oci/chat_models/oci_generative_ai.py
@@ -563,10 +563,19 @@ def process_stream_tool_calls(
             if tool_id:
                 tool_call_ids.add(tool_id)
 
+            args = tool_call["function"].get("arguments")
+            # If args is a double-escaped JSON string, parse it twice to get the original JSON  # noqa: E501
+            try:
+                parsed_args = json.loads(json.loads(args))
+                args = json.dumps(parsed_args)
+            # If args is not a double-escaped JSON string, keep it as is
+            except (json.JSONDecodeError, TypeError):
+                pass
+
             tool_call_chunks.append(
                 tool_call_chunk(
                     name=tool_call["function"].get("name"),
-                    args=tool_call["function"].get("arguments"),
+                    args=args,
                     id=tool_id,
                     index=len(tool_call_ids) - 1,  # index tracking
                 )
@@ -1027,10 +1036,19 @@ def process_stream_tool_calls(
             if tool_id:
                 tool_call_ids.add(tool_id)
 
+            args = tool_call["function"].get("arguments")
+            # If args is a double-escaped JSON string, parse it twice to get the original JSON  # noqa: E501
+            try:
+                parsed_args = json.loads(json.loads(args))
+                args = json.dumps(parsed_args)
+            # If args is not a double-escaped JSON string, keep it as is
+            except (json.JSONDecodeError, TypeError):
+                pass
+
             tool_call_chunks.append(
                 tool_call_chunk(
                     name=tool_call["function"].get("name"),
-                    args=tool_call["function"].get("arguments"),
+                    args=args,
                     id=tool_id,
                     index=len(tool_call_ids) - 1,  # index tracking
                 )