diff --git a/.codex/environments/environment.toml b/.codex/environments/environment.toml
new file mode 100644
index 0000000..fd7d4f6
--- /dev/null
+++ b/.codex/environments/environment.toml
@@ -0,0 +1,9 @@
+version = 1
+name = "codex-app-server-protocol"
+
+[setup]
+script = '''
+nvm install
+corepack enable
+pnpm install
+'''