diff --git a/fix.go b/fix.go
new file mode 100644
index 0000000..4cf4bc2
--- /dev/null
+++ b/fix.go
@@ -0,0 +1,13 @@
+package fix
+
+// IsIdempotent checks if an HTTP method is safe to retry automatically.
+// Non-idempotent methods (POST, PATCH) should not be retried without
+// explicit user consent to prevent duplicate side effects.
+func IsIdempotent(method string) bool {
+    switch method {
+    case "GET", "HEAD", "OPTIONS", "TRACE", "PUT", "DELETE":
+        return true
+    default:
+        return false
+    }
+}