diff --git a/.codex/environments/environment.toml b/.codex/environments/environment.toml
new file mode 100644
index 0000000..b843bc4
--- /dev/null
+++ b/.codex/environments/environment.toml
@@ -0,0 +1,11 @@
+version = 1
+name = "braid"
+
+[setup]
+script = ""
+
+[cleanup]
+script = '''
+bazel clean --expunge_async
+bazel shutdown
+'''