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/request_test.rb

@@ -0,0 +1,106 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+module ModelContextProtocol
+  module JsonRPC
+    class RequestTest < ActiveSupport::TestCase
+      test "Request.parse parses valid JSON-RPC request" do
+        json = {
+          jsonrpc: "2.0",
+          method: "test_method",
+          params: { foo: "bar" },
+          id: 1,
+        }.to_json
+
+        request = Request.parse(json)
+        assert_equal "2.0", request.version
+        assert_equal "test_method", request.method
+        assert_equal({ "foo" => "bar" }, request.params)
+        assert_equal 1, request.id
+      end
+
+      test "Request.parse raises ParseError for invalid JSON" do
+        assert_raises(ParseError) do
+          Request.parse("invalid json")
+        end
+      end
+
+      test "Request#initialize sets attributes" do
+        request = Request.new(
+          version: "2.0",
+          method: "test_method",
+          params: { "foo" => "bar" },
+          id: 1,
+        )
+
+        assert_equal "2.0", request.version
+        assert_equal "test_method", request.method
+        assert_equal({ "foo" => "bar" }, request.params)
+        assert_equal 1, request.id
+      end
+
+      test "Request#notification? returns true when id is nil" do
+        request = Request.new(
+          version: "2.0",
+          method: "test_method",
+        )
+        assert request.notification?
+      end
+
+      test "Request#notification? returns false when id is present" do
+        request = Request.new(
+          version: "2.0",
+          method: "test_method",
+          id: 1,
+        )
+        refute request.notification?
+      end
+
+      test "Request#valid? returns true for valid request" do
+        request = Request.new(
+          version: "2.0",
+          method: "test_method",
+        )
+        assert request.valid?
+      end
+
+      test "Request#valid? returns false for invalid version" do
+        request = Request.new(
+          version: "1.0",
+          method: "test_method",
+        )
+        refute request.valid?
+      end
+
+      test "Request#validate! raises InvalidRequestError for invalid version" do
+        assert_raises(InvalidRequestError) do
+          Request.new(
+            version: "1.0",
+            method: "test_method",
+          ).validate!
+        end
+      end
+
+      test "Request#validate! raises InvalidRequestError for rpc prefixed method" do
+        assert_raises(InvalidRequestError) do
+          Request.new(
+            version: "2.0",
+            method: "rpc.test",
+          ).validate!
+        end
+      end
+
+      test "Request#method_not_found! raises MethodNotFoundError" do
+        request = Request.new(
+          version: "2.0",
+          method: "test_method",
+        )
+
+        assert_raises(MethodNotFoundError) do
+          request.method_not_found!
+        end
+      end
+    end
+  end
+end