diff --git a/marl_eval/json_tools/json_utils.py b/marl_eval/json_tools/json_utils.py
index 58203450..93633868 100644
--- a/marl_eval/json_tools/json_utils.py
+++ b/marl_eval/json_tools/json_utils.py
@@ -18,7 +18,7 @@
 import os
 import zipfile
 from collections import defaultdict
-from concurrent.futures import as_completed, ThreadPoolExecutor
+from concurrent.futures import ThreadPoolExecutor, as_completed
 from pathlib import Path
 from typing import Dict, List, Tuple
 
@@ -113,11 +113,11 @@ def concatenate_json_files(
 
 
 def pull_neptune_data(
-        project_name: str,
-        tags: List[str],
-        store_directory: str = "./downloaded_json_data",
-        neptune_data_key: str = "metrics",
-        disable_progress_bar: bool = False,
+    project_name: str,
+    tags: List[str],
+    store_directory: str = "./downloaded_json_data",
+    neptune_data_key: str = "metrics",
+    disable_progress_bar: bool = False,
 ) -> None:
     """Downloads logs from a Neptune project based on provided tags.
 
@@ -128,7 +128,7 @@ def pull_neptune_data(
             Default is "./downloaded_json_data".
         neptune_data_key (str, optional): Key for the Neptune data to download.
             Default is "metrics".
-        disable_progress_bar (bool, optional): Whether to hide a progress bar during download.
+        disable_progress_bar (bool, optional): Whether to hide a progress bar.
             Default is False.
 
     Raises:
@@ -150,10 +150,7 @@ def pull_neptune_data(
     # Fetch runs based on provided tags
     try:
         runs_table_df = project.fetch_runs_table(
-            state="inactive",
-            columns=['sys/id'],
-            tag=tags,
-            sort_by='sys/id'
+            state="inactive", columns=["sys/id"], tag=tags, sort_by="sys/id"
         ).to_pandas()
     except Exception as e:
         raise ValueError(f"Invalid tags {tags}: {e}")
@@ -162,8 +159,22 @@ def pull_neptune_data(
 
     # Download logs concurrently
     with ThreadPoolExecutor() as executor:
-        futures = [executor.submit(download_and_extract_data, project_name, run_id, store_directory, neptune_data_key) for run_id in run_ids]
-        for future in tqdm(as_completed(futures), total=len(futures), desc="Downloading JSON logs", disable=disable_progress_bar):
+        futures = [
+            executor.submit(
+                _download_and_extract_data,
+                project_name,
+                run_id,
+                store_directory,
+                neptune_data_key,
+            )
+            for run_id in run_ids
+        ]
+        for future in tqdm(
+            as_completed(futures),
+            total=len(futures),
+            desc="Downloading JSON logs",
+            disable=disable_progress_bar,
+        ):
             future.result()
 
     # Restore neptune logger level
@@ -171,20 +182,26 @@ def pull_neptune_data(
     print(f"{Fore.CYAN}{Style.BRIGHT}Data downloaded successfully!{Style.RESET_ALL}")
 
 
-def download_and_extract_data(project_name, run_id, store_directory, neptune_data_key):
+def _download_and_extract_data(
+    project_name: str, run_id: str, store_directory: str, neptune_data_key: str
+) -> None:
     try:
-        with neptune.init_run(project=project_name, with_id=run_id, mode="read-only") as run:
-            for j, data_key in enumerate(run.get_structure()[neptune_data_key].keys(), start=1):
+        with neptune.init_run(
+            project=project_name, with_id=run_id, mode="read-only"
+        ) as run:
+            for j, data_key in enumerate(
+                run.get_structure()[neptune_data_key].keys(), start=1
+            ):
                 file_path = f"{store_directory}/{run_id}"
                 if j > 1:
                     file_path += f"_{j}"
                 run[f"{neptune_data_key}/{data_key}"].download(destination=file_path)
-                extract_zip_file(file_path)
+                _extract_zip_file(file_path)
     except Exception as e:
         print(f"Error downloading data for run {run_id}: {e}")
 
 
-def extract_zip_file(file_path):
+def _extract_zip_file(file_path: str) -> None:
     try:
         with zipfile.ZipFile(file_path, "r") as zip_ref:
             for member in zip_ref.infolist():