Add basic HTTP client support with pluggable transports

lib/mcp/client/tool.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module MCP
+  class Client
+    class Tool
+      attr_reader :name, :description, :input_schema
+
+      def initialize(name:, description:, input_schema:)
+        @name = name
+        @description = description
+        @input_schema = input_schema
+      end
+    end
+  end
+end