diff --git a/Gemfile b/Gemfile
index b356cad..5bb001b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,4 +15,5 @@ group :development, :test do
   gem 'rake', '~> 13.0.1'
   gem 'pry-byebug'
   gem 'rubocop', '~> 1.57.1'
+  gem 'webmock'
 end
diff --git a/lib/devcycle-ruby-server-sdk/api/client.rb b/lib/devcycle-ruby-server-sdk/api/client.rb
index 5261730..73bf626 100644
--- a/lib/devcycle-ruby-server-sdk/api/client.rb
+++ b/lib/devcycle-ruby-server-sdk/api/client.rb
@@ -325,14 +325,27 @@ def variable_with_http_info(key, user, default, opts = {})
         if @api_client.config.debugging
           @api_client.config.logger.debug "API called: DevCycle::Client#variable\nData: #{data.inspect}\nStatus code: #{status_code}\nHeaders: #{headers}"
         end
+        if default && data.type
+          api_type_to_ruby_class = {
+            'Boolean' => [TrueClass, FalseClass],
+            'Number' => [Integer, Float],
+            'String' => [String],
+            'JSON' => [Hash]
+          }
+          ruby_classes = api_type_to_ruby_class[data.type.to_s]
+          unless ruby_classes && ruby_classes.any? { |klass| default.is_a?(klass) }
+            eval = { reason: DevCycle::EVAL_REASONS::DEFAULT, details: DevCycle::DEFAULT_REASON_DETAILS::TYPE_MISMATCH }
+            return Variable.new(key: key, value: default, isDefaulted: true, eval: eval)
+          end
+        end
         return data
       rescue ApiError => error
-        if error.code != 404
+        if error.code == 404
           @api_client.config.logger.error("Failed to retrieve variable value: #{error.message}")
         end
 
-        return Variable.new(key: key, value: default, isDefaulted: true)
-      end
+        return Variable.new(key: key, value: default, isDefaulted: true, eval: { reason: DevCycle::EVAL_REASONS::DEFAULT, details: DevCycle::DEFAULT_REASON_DETAILS::ERROR })
+      end 
     end
 
     # Get all variables by key for user data
diff --git a/lib/devcycle-ruby-server-sdk/eval_reasons.rb b/lib/devcycle-ruby-server-sdk/eval_reasons.rb
index 01f58de..030e891 100644
--- a/lib/devcycle-ruby-server-sdk/eval_reasons.rb
+++ b/lib/devcycle-ruby-server-sdk/eval_reasons.rb
@@ -9,5 +9,8 @@ module EVAL_REASONS
   module DEFAULT_REASON_DETAILS
     MISSING_CONFIG = 'Missing Config'
     USER_NOT_TARGETED = 'User Not Targeted'
+    TYPE_MISMATCH = 'Variable Type Mismatch'
+    MISSING_VARIABLE = 'Missing Variable'
+    ERROR = 'Error'
   end
 end
diff --git a/lib/devcycle-ruby-server-sdk/models/variable.rb b/lib/devcycle-ruby-server-sdk/models/variable.rb
index 675c3c8..359780b 100644
--- a/lib/devcycle-ruby-server-sdk/models/variable.rb
+++ b/lib/devcycle-ruby-server-sdk/models/variable.rb
@@ -78,7 +78,8 @@ def self.openapi_types
         :'type' => :'String',
         :'value' => :'Object',
         :'defaultValue' => :'Object',
-        :'isDefaulted' => :'Boolean'
+        :'isDefaulted' => :'Boolean',
+        :'eval' => :'Object'
       }
     end
 
diff --git a/spec/api/devcycle_api_spec.rb b/spec/api/devcycle_api_spec.rb
index 437c210..f18f139 100644
--- a/spec/api/devcycle_api_spec.rb
+++ b/spec/api/devcycle_api_spec.rb
@@ -12,6 +12,9 @@
 
 require 'spec_helper'
 require 'json'
+require 'webmock'
+
+include WebMock::API
 
 # Unit tests for DevCycle::Client
 # Automatically generated by openapi-generator (https://openapi-generator.tech)
@@ -68,6 +71,8 @@
     it 'should work' do
       result = @api_instance.variable(@user, "ruby-example-tests-default", false)
       expect(result.isDefaulted).to eq true
+      expect(result.eval[:reason]).to eq "DEFAULT"
+      expect(result.eval[:details]).to eq "Error"
 
       result = @api_instance.variable_value(@user, "ruby-example-tests-default", true)
       expect(result).to eq true
@@ -88,6 +93,51 @@
 
       result = @api_instance.variable_value(@user, "test", true)
       expect(result).to eq true
+
+      result = @api_instance.variable(@user, "test-number-variable", 0)
+      expect(result.isDefaulted).to eq false
+      expect(result.value).to eq 123
+
+      result = @api_instance.variable(@user, "test-number-variable", 0)
+      expect(result.isDefaulted).to eq false
+      expect(result.value).to eq 123
+
+      result = @api_instance.variable(@user, "test-float-variable", 0.0)
+      expect(result.isDefaulted).to eq false
+      expect(result.value).to eq 4.56
+
+      result = @api_instance.variable(@user, "test-string-variable", "")
+      expect(result.isDefaulted).to eq false
+      expect(result.value).to eq "on"
+
+      result = @api_instance.variable(@user, "test-json-variable", {})
+      expect(result.isDefaulted).to eq false
+      expect(result.value).to eq({:message => "a"})
+
+      result = @api_instance.variable(@user, "test", "false")
+      expect(result.isDefaulted).to eq true
+      expect(result.eval[:reason]).to eq "DEFAULT"
+      expect(result.eval[:details]).to eq "Variable Type Mismatch"
+
+      result = @api_instance.variable(@user, "test-number-variable", "123")
+      expect(result.isDefaulted).to eq true
+      expect(result.eval[:reason]).to eq "DEFAULT"
+      expect(result.eval[:details]).to eq "Variable Type Mismatch"
+
+      result = @api_instance.variable(@user, "test-number-variable", true)
+      expect(result.isDefaulted).to eq true
+      expect(result.eval[:reason]).to eq "DEFAULT"
+      expect(result.eval[:details]).to eq "Variable Type Mismatch"
+
+      result = @api_instance.variable(@user, "test-string-variable", true)
+      expect(result.isDefaulted).to eq true
+      expect(result.eval[:reason]).to eq "DEFAULT"
+      expect(result.eval[:details]).to eq "Variable Type Mismatch"
+
+      result = @api_instance.variable(@user, "test-json-variable", "on")
+      expect(result.isDefaulted).to eq true
+      expect(result.eval[:reason]).to eq "DEFAULT"
+      expect(result.eval[:details]).to eq "Variable Type Mismatch" 
     end
   end
 
@@ -104,4 +154,37 @@
     end
   end
 
+  describe 'get_variable_by_key test' do
+    before do
+      WebMock.disable_net_connect!(allow_localhost: true)
+    end
+    
+    after do
+      WebMock.allow_net_connect!
+    end
+    
+    it 'should work with mocked response' do
+      stub_request(:post, "https://bucketing-api.devcycle.com/v1/variables/mocked_variable").
+        to_return(status: 200, body: "{\"isDefaulted\": false, \"value\": true, \"eval\": {\"reason\": \"SPLIT\", \"details\": \"Random Distribution | All Users\", \"target_id\": \"621642332ea68943c8833c4d\"}}", headers: {})
+
+      result = @api_instance.variable(@user, "mocked_variable", false)
+      expect(result.isDefaulted).to eq false
+      expect(result.value).to eq true
+      # Use Hash syntax since eval is deserialized as a Hash
+      expect(result.eval[:reason]).to eq "SPLIT"
+      expect(result.eval[:details]).to eq "Random Distribution | All Users"
+      expect(result.eval[:target_id]).to eq "621642332ea68943c8833c4d"
+    end
+
+    it 'should return error details' do
+      stub_request(:post, "https://bucketing-api.devcycle.com/v1/variables/test").
+        to_return(status: 500, body: "{\"isDefaulted\": true, \"value\": false, \"eval\": {\"reason\": \"DEFAULT\", \"details\": \"Error\"}}", headers: {})
+
+      result = @api_instance.variable(@user, "test", false)
+      expect(result.isDefaulted).to eq true
+      expect(result.eval[:reason]).to eq "DEFAULT"
+      expect(result.eval[:details]).to eq "Error"
+    end
+  end
+
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index c57463b..60942ed 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -12,6 +12,10 @@
 
 # load the gem
 require 'devcycle-ruby-server-sdk'
+require 'webmock/rspec'
+
+# Configure WebMock to allow real HTTP requests by default, but enable it for specific tests
+WebMock.allow_net_connect!
 
 # The following  was generated by the `rspec --init` command. Conventionally, all
 # specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.