diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
new file mode 100644
index 0000000..d1f1821
--- /dev/null
+++ b/.github/workflows/workflow.yml
@@ -0,0 +1,32 @@
+name: tox
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    name: test ${{ matrix.py }} - ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - Ubuntu
+          - Windows
+          - MacOs
+        py:
+          - "3.10"
+    steps:
+      - name: Setup python for test ${{ matrix.py }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.py }}
+      - uses: actions/checkout@v3
+      - name: Upgrade pip
+        run: python -m pip install -U pip
+      - name: Install
+        run: python -m pip install -e '.[dev]'
+      - name: Check formatting
+        run: ruff format pokemonred_puffer
+      - name: Check lint
+        run: ruff check pokemonred_puffer
\ No newline at end of file
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..8f03df7
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,9 @@
+repos:
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    # Ruff version.
+    rev: v0.3.2
+    hooks:
+      # Run the linter.
+      - id: ruff
+      # Run the formatter.
+      - id: ruff-format
\ No newline at end of file
diff --git a/README.md b/README.md
index 6aa979d..f7eea26 100644
--- a/README.md
+++ b/README.md
@@ -74,4 +74,15 @@ To add rewards, add a new class to the `rewards` directory. Then update the `rew
 
 ### Adding Policies
 
-To add policies, add a new class to the `policies` directory. Then update the `policies` section of `config.yaml`. A policy section is keyed by the class path. It is assumed that a recurrent policy will live in the same module as the policy it wraps.
\ No newline at end of file
+To add policies, add a new class to the `policies` directory. Then update the `policies` section of `config.yaml`. A policy section is keyed by the class path. It is assumed that a recurrent policy will live in the same module as the policy it wraps.
+
+## Development
+
+This repo uses [pre-commit](https://pre-commit.com/) to enforce formatting and linting. For development, please install this repo with:
+
+```sh
+pip3 install -e '.[dev]'
+pre-commit install
+```
+
+For any changes, please submit a PR.
\ No newline at end of file
diff --git a/pokemonred_puffer/cleanrl_puffer.py b/pokemonred_puffer/cleanrl_puffer.py
index 754677d..60e7b86 100644
--- a/pokemonred_puffer/cleanrl_puffer.py
+++ b/pokemonred_puffer/cleanrl_puffer.py
@@ -7,7 +7,6 @@
 import uuid
 from collections import defaultdict
 from datetime import timedelta
-import warnings
 
 import numpy as np
 import pufferlib
@@ -145,7 +144,7 @@ def print_dashboard(stats, init_performance, performance):
         elif "time" in k:
             try:
                 v = f"{v:.2f} s"
-            except:
+            except:  # noqa
                 pass
 
         first_word, *rest_words = k.split("_")
@@ -343,7 +342,6 @@ def evaluate(self):
             self.log = False
 
         self.policy_pool.update_policies()
-        performance = defaultdict(list)
         env_profiler = pufferlib.utils.Profiler()
         inference_profiler = pufferlib.utils.Profiler()
         eval_profiler = pufferlib.utils.Profiler(memory=True, pytorch_memory=True).start()
@@ -492,7 +490,7 @@ def evaluate(self):
                 self.stats[f"Histogram/{k}"] = self.wandb.Histogram(v, num_bins=16)
                 self.stats[k] = np.mean(v)
                 self.max_stats[k] = np.max(v)
-            except: 
+            except:  # noqa
                 continue
 
         if config.verbose:
@@ -549,7 +547,7 @@ def train(self):
         self.b_obs = b_obs = torch.Tensor(self.obs_ary[b_idxs])
         b_actions = torch.Tensor(self.actions_ary[b_idxs]).to(self.device, non_blocking=True)
         b_logprobs = torch.Tensor(self.logprobs_ary[b_idxs]).to(self.device, non_blocking=True)
-        b_dones = torch.Tensor(self.dones_ary[b_idxs]).to(self.device, non_blocking=True)
+        # b_dones = torch.Tensor(self.dones_ary[b_idxs]).to(self.device, non_blocking=True)
         b_values = torch.Tensor(self.values_ary[b_idxs]).to(self.device, non_blocking=True)
         b_advantages = advantages.reshape(
             config.batch_rows, num_minibatches, config.bptt_horizon
diff --git a/pokemonred_puffer/global_map.py b/pokemonred_puffer/global_map.py
index dd17a46..a8b9118 100644
--- a/pokemonred_puffer/global_map.py
+++ b/pokemonred_puffer/global_map.py
@@ -1,18 +1,22 @@
 import os
 import json
 
-MAP_PATH = os.path.join(os.path.dirname(__file__), 'map_data.json')
+MAP_PATH = os.path.join(os.path.dirname(__file__), "map_data.json")
 GLOBAL_MAP_SHAPE = (444, 436)
 
 with open(MAP_PATH) as map_data:
-    MAP_DATA = json.load(map_data)['regions']
-MAP_DATA = {int(e['id']): e for e in MAP_DATA}
+    MAP_DATA = json.load(map_data)["regions"]
+MAP_DATA = {int(e["id"]): e for e in MAP_DATA}
+
 
 # Handle KeyErrors
 def local_to_global(r: int, c: int, map_n: int):
     try:
-        map_x, map_y,= MAP_DATA[map_n]['coordinates']
+        (
+            map_x,
+            map_y,
+        ) = MAP_DATA[map_n]["coordinates"]
         return r + map_y, c + map_x
     except KeyError:
-        print(f'Map id {map_n} not found in map_data.json.')
-        return r + 0, c + 0
\ No newline at end of file
+        print(f"Map id {map_n} not found in map_data.json.")
+        return r + 0, c + 0
diff --git a/pokemonred_puffer/policies/multi_convolutional.py b/pokemonred_puffer/policies/multi_convolutional.py
index b3c168b..7f3ada4 100644
--- a/pokemonred_puffer/policies/multi_convolutional.py
+++ b/pokemonred_puffer/policies/multi_convolutional.py
@@ -15,10 +15,12 @@ def one_hot(tensor, num_classes):
         torch.int64
     )
 
+
 class RecurrentMultiConvolutionalWrapper(pufferlib.models.RecurrentWrapper):
     def __init__(self, env, policy, input_size=512, hidden_size=512, num_layers=1):
         super().__init__(env, policy, input_size, hidden_size, num_layers)
 
+
 class MultiConvolutionalPolicy(pufferlib.models.Policy):
     def __init__(
         self,
diff --git a/pokemonred_puffer/resnet.py b/pokemonred_puffer/resnet.py
index ef8e7b8..cdeeaf2 100644
--- a/pokemonred_puffer/resnet.py
+++ b/pokemonred_puffer/resnet.py
@@ -166,7 +166,9 @@ def __init__(
             )
         self.groups = groups
         self.base_width = width_per_group
-        self.conv1 = nn.Conv2d(input_channels, self.inplanes, kernel_size=7, stride=2, padding=3, bias=False)
+        self.conv1 = nn.Conv2d(
+            input_channels, self.inplanes, kernel_size=7, stride=2, padding=3, bias=False
+        )
         self.bn1 = norm_layer(self.inplanes)
         self.relu = nn.ReLU(inplace=True)
         self.maxpool = nn.MaxPool2d(kernel_size=3, stride=2, padding=1)
diff --git a/pokemonred_puffer/train.py b/pokemonred_puffer/train.py
index 47f4095..ec1d786 100644
--- a/pokemonred_puffer/train.py
+++ b/pokemonred_puffer/train.py
@@ -204,7 +204,7 @@ def train(
         "-p",
         "--policy-name",
         default="multi_convolutional.MultiConvolutionalPolicy",
-        help="Policy module to use in policies",
+        help="Policy module to use in policies.",
     )
     parser.add_argument(
         "-r",
diff --git a/pokemonred_puffer/wrappers/stream_wrapper.py b/pokemonred_puffer/wrappers/stream_wrapper.py
index 9590a9e..6fedb87 100644
--- a/pokemonred_puffer/wrappers/stream_wrapper.py
+++ b/pokemonred_puffer/wrappers/stream_wrapper.py
@@ -58,13 +58,13 @@ async def broadcast_ws_message(self, message):
         if self.websocket is not None:
             try:
                 await self.websocket.send(message)
-            except websockets.exceptions.WebSocketException as e:
+            except websockets.exceptions.WebSocketException:
                 self.websocket = None
 
     async def establish_wc_connection(self):
         try:
             self.websocket = await websockets.connect(self.ws_address)
-        except:
+        except:  # noqa
             self.websocket = None
 
     def reset(self, *args, **kwargs):
diff --git a/pyproject.toml b/pyproject.toml
index 0c971ac..c57c8e5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,6 +35,7 @@ monitoring = [
     "nvitop"
 ]
 dev = [
+    "pre-commit",
     "ruff"
 ]