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docs/snippets/dart/plugins/min_length_validator.md

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+<!-- snippet:skip reason="Dart cannot construct the opaque BoxFn closure types required by createValidatorDartImpl — flutter_rust_bridge generates them as RustOpaqueInterface with no Dart-side wrapper. Custom validators must be written in Rust." -->
+```dart title="Dart"
+import 'package:kreuzberg/kreuzberg.dart';
+
+Future<void> main() async {
+  // A Dart implementation of the `Validator` trait that asserts a minimum
+  // content length cannot be plugged into the global validator registry.
+  // `Kreuzberg.registerValidator(impl)` exists, but its
+  // `createValidatorDartImpl` factory takes opaque `BoxFn*` closure
+  // arguments whose constructors are not surfaced through
+  // flutter_rust_bridge.
+  //
+  // Implement the validator in Rust and register it via `register_validator`
+  // in a Rust shim crate.
+}
+```