validate method

String? validate(
  1. Map<String, dynamic> input
)

Validates the input map against inputSchema.

Returns null on success, or a human-readable error string.

Implementation

String? validate(Map<String, dynamic> input) {
  final missing = inputSchema.keys
      .where((k) => !input.containsKey(k) || input[k] == null)
      .toList();
  if (missing.isEmpty) return null;
  return 'Missing required input(s): ${missing.join(", ")}';
}