Internal Release v0.1.1

- implement `Prompt`
- adjust Tool approach
- update readme for tool calling
- document usage of `Prompt`

lib/model_context_protocol/prompt.rb

@@ -0,0 +1,79 @@
+# typed: strict
+# frozen_string_literal: true
+
+module ModelContextProtocol
+  class Prompt
+    class Argument
+      attr_reader :name, :description, :required, :arguments
+
+      def initialize(name:, description: nil, required: false)
+        @name = name
+        @description = description
+        @required = required
+        @arguments = arguments
+      end
+
+      def to_h
+        { name:, description:, required: }.compact
+      end
+    end
+
+    class Message
+      attr_reader :role, :content
+
+      def initialize(role:, content:)
+        @role = role
+        @content = content
+      end
+
+      def to_h
+        { role:, content: content.to_h }.compact
+      end
+    end
+
+    class Result
+      attr_reader :description, :messages
+
+      def initialize(description: nil, messages: [])
+        @description = description
+        @messages = messages
+      end
+
+      def to_h
+        { description:, messages: messages.map(&:to_h) }.compact
+      end
+    end
+
+    attr_reader :name, :description, :arguments
+
+    def initialize(name:, description: nil, arguments: [], &block)
+      @name = name
+      @description = description
+      @arguments = arguments
+      @template_block = block
+    end
+
+    def template(args)
+      validate_args!(args)
+      result = @template_block.call(args)
+      result
+    end
+
+    def to_h
+      { name:, description:, arguments: arguments.map(&:to_h) }.compact
+    end
+
+    private
+
+    def required_args
+      arguments.filter_map { |arg| arg.name if arg.required }
+    end
+
+    def validate_args!(args)
+      missing = required_args - args.keys
+      return if missing.empty?
+
+      raise ArgumentError, "Missing required arguments: #{missing.join(", ")}"
+    end
+  end
+end