diff --git a/tox.ini b/tox.ini
index c3dda59e..6ee822d9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,3 +28,15 @@ deps =
 
 commands =
     sphinx-build -W -b html {toxinidir}/docs/source/ {toxinidir}/docs/build/html
+
+[testenv:format]
+# An environment for formatting code.
+deps =
+    black==24.*
+    isort==5.*
+
+skip_install = True
+
+commands =
+    black fabrictestbed_extensions tests
+    isort fabrictestbed_extensions tests