just redo all of it from scratch

lib/mcp/shared/tool/input_schema.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+module MCP
+  class Tool
+    class InputSchema
+      attr_reader :properties, :required
+
+      def initialize(properties: {}, required: [])
+        @properties = properties
+        @required = required.map(&:to_sym)
+      end
+
+      def to_h
+        { type: "object", properties:, required: }
+      end
+
+      def missing_required_arguments?(arguments)
+        missing_required_arguments(arguments).any?
+      end
+
+      def missing_required_arguments(arguments)
+        (required - arguments.keys.map(&:to_sym))
+      end
+    end
+  end
+end