diff --git a/.codex/environments/environment.toml b/.codex/environments/environment.toml
new file mode 100644
index 0000000000..f67f1983f2
--- /dev/null
+++ b/.codex/environments/environment.toml
@@ -0,0 +1,11 @@
+# THIS IS AUTOGENERATED. DO NOT EDIT MANUALLY
+version = 1
+name = "codex"
+
+[setup]
+script = ""
+
+[[actions]]
+name = "Run"
+icon = "run"
+command = "cargo +1.93.0 run --manifest-path=codex-rs/Cargo.toml --bin codex -- -c mcp_oauth_credentials_store=file"