diff --git a/.tangled/workflows/fmt.yml b/.tangled/workflows/fmt.yml
new file mode 100644
index 0000000..a1bded9
--- /dev/null
+++ b/.tangled/workflows/fmt.yml
@@ -0,0 +1,14 @@
+when:
+  - event: ["push", "pull_request"]
+    branch: ["main"]
+
+dependencies:
+  nixpkgs:
+    - cargo
+    - rustc
+    - rustfmt
+
+steps:
+  - name: "cargo fmt"
+    command: |
+       cargo fmt --all --check