Internal Release v0.1.1

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

test/model_context_protocol/json_rpc/response_test.rb

@@ -0,0 +1,70 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+module ModelContextProtocol
+  module JsonRPC
+    class ResponseTest < ActiveSupport::TestCase
+      test "Response#initialize sets attributes with result" do
+        result = { foo: "bar" }
+        id = 1
+        response = Response.new(result: result, id: id)
+
+        assert_equal "2.0", response.version
+        assert_equal result, response.result
+        assert_nil response.error
+        assert_equal id, response.id
+      end
+
+      test "Response#initialize sets attributes with error" do
+        error = Error.new(code: -32700, message: "Test error")
+        id = 1
+        response = Response.new(error: error, id: id)
+
+        assert_equal "2.0", response.version
+        assert_nil response.result
+        assert_equal error, response.error
+        assert_equal id, response.id
+      end
+
+      test "Response#to_h returns hash representation with result" do
+        result = { foo: "bar" }
+        id = 1
+        response = Response.new(result: result, id: id)
+        expected = {
+          jsonrpc: "2.0",
+          result: result,
+          id: id,
+        }
+        assert_equal expected, response.to_h
+      end
+
+      test "Response#to_h returns hash representation with error" do
+        error = Error.new(code: -32700, message: "Test error")
+        id = 1
+        response = Response.new(error: error, id: id)
+        expected = {
+          jsonrpc: "2.0",
+          error: error.to_h,
+          id: id,
+        }
+        assert_equal expected, response.to_h
+      end
+
+      test "Response#initialize raises InvalidResponse when both result and error present" do
+        assert_raises(InvalidResponse) do
+          Response.new(
+            result: { foo: "bar" },
+            error: Error.new(code: -32700, message: "Test error"),
+          )
+        end
+      end
+
+      test "Response#initialize raises InvalidResponse when neither result nor error present" do
+        assert_raises(InvalidResponse) do
+          Response.new
+        end
+      end
+    end
+  end
+end