diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..63534d6
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: ['3.1', '3.2', '3.3', '3.4']
+
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up Ruby ${{ matrix.ruby-version }}
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true
+    
+    - name: Run Standard (linting)
+      run: bundle exec rake standard
+    
+    - name: Run RSpec (tests)
+      run: bundle exec rake spec
diff --git a/Rakefile b/Rakefile
index 26129b3..14ee450 100644
--- a/Rakefile
+++ b/Rakefile
@@ -3,3 +3,7 @@
 require "bundler/gem_tasks"
 require "rspec/core/rake_task"
 require "standard/rake"
+
+RSpec::Core::RakeTask.new(:spec)
+
+task default: %i[standard spec]
diff --git a/lib/ruby_llm/schema.rb b/lib/ruby_llm/schema.rb
index bf80395..1a380ce 100644
--- a/lib/ruby_llm/schema.rb
+++ b/lib/ruby_llm/schema.rb
@@ -7,13 +7,12 @@
 require_relative "schema/dsl"
 require_relative "schema/json_output"
 require "json"
-require "set"
 
 module RubyLLM
   class Schema
     extend DSL
     include JsonOutput
-    
+
     PRIMITIVE_TYPES = %i[string number integer boolean null].freeze
 
     class << self
diff --git a/lib/ruby_llm/schema/dsl.rb b/lib/ruby_llm/schema/dsl.rb
index baedc46..475e3b5 100644
--- a/lib/ruby_llm/schema/dsl.rb
+++ b/lib/ruby_llm/schema/dsl.rb
@@ -13,7 +13,7 @@ def string(name = nil, enum: nil, description: nil, required: true, min_length:
           pattern: pattern,
           format: format
         }.compact
-        
+
         add_property(name, build_property_schema(:string, **options), required: required)
       end
 
@@ -24,7 +24,7 @@ def number(name = nil, description: nil, required: true, minimum: nil, maximum:
           maximum: maximum,
           multipleOf: multiple_of
         }.compact
-        
+
         add_property(name, build_property_schema(:number, **options), required: required)
       end
 
@@ -161,7 +161,7 @@ def determine_array_items(of, &)
       def collect_property_schemas_from_block(&block)
         schemas = []
         schema_builder = self  # Capture the current context that has build_property_schema
-        
+
         context = Object.new
         context.define_singleton_method(:string) { |name = nil, **options| schemas << schema_builder.build_property_schema(:string, **options) }
         context.define_singleton_method(:number) { |name = nil, **options| schemas << schema_builder.build_property_schema(:number, **options) }
@@ -170,7 +170,7 @@ def collect_property_schemas_from_block(&block)
         context.define_singleton_method(:null) { |name = nil, **options| schemas << schema_builder.build_property_schema(:null, **options) }
         context.define_singleton_method(:object) { |name = nil, **options, &blk| schemas << schema_builder.build_property_schema(:object, **options, &blk) }
         context.define_singleton_method(:any_of) { |name = nil, **options, &blk| schemas << schema_builder.build_property_schema(:any_of, **options, &blk) }
-        
+
         context.instance_eval(&block)
         schemas
       end
diff --git a/lib/ruby_llm/schema/json_output.rb b/lib/ruby_llm/schema/json_output.rb
index 8035b9f..7d66e8d 100644
--- a/lib/ruby_llm/schema/json_output.rb
+++ b/lib/ruby_llm/schema/json_output.rb
@@ -5,7 +5,7 @@ class Schema
     module JsonOutput
       def to_json_schema
         validate!  # Validate schema before generating JSON
-        
+
         {
           name: @name,
           description: @description || self.class.description,
diff --git a/lib/ruby_llm/schema/validator.rb b/lib/ruby_llm/schema/validator.rb
index eda7774..6c46a71 100644
--- a/lib/ruby_llm/schema/validator.rb
+++ b/lib/ruby_llm/schema/validator.rb
@@ -32,7 +32,7 @@ def validate_circular_references!
 
         # Initialize all nodes as WHITE (no mark)
         marks = Hash.new { WHITE }
-        
+
         # Visit each unmarked node
         definitions.each_key do |node|
           visit(node, definitions, marks) if marks[node] == WHITE
@@ -43,7 +43,7 @@ def validate_circular_references!
       def visit(node, definitions, marks)
         # If node has a permanent mark, return
         return if marks[node] == BLACK
-        
+
         # If node has a temporary mark, we found a cycle
         if marks[node] == GRAY
           raise ValidationError, "Circular reference detected involving '#{node}'"
@@ -51,7 +51,7 @@ def visit(node, definitions, marks)
 
         # Mark node with temporary mark
         marks[node] = GRAY
-        
+
         # Visit all adjacent nodes (dependencies)
         definition = definitions[node]
         if definition && definition[:properties]
@@ -62,14 +62,14 @@ def visit(node, definitions, marks)
             end
           end
         end
-        
+
         # Mark node with permanent mark
         marks[node] = BLACK
       end
 
       def extract_references(property)
         references = []
-        
+
         case property
         when Hash
           if property["$ref"]
diff --git a/lib/tasks/release.rake b/lib/tasks/release.rake
index 79df057..347f55c 100644
--- a/lib/tasks/release.rake
+++ b/lib/tasks/release.rake
@@ -2,11 +2,11 @@ namespace :release do
   desc "Release a new version of the gem"
   task :version, [:message] do |t, args|
     # Load the current version from version.rb
-    require_relative '../../lib/ruby_llm/schema/version'
+    require_relative "../../lib/ruby_llm/schema/version"
     version = RubyLlm::Schema::VERSION
-    
+
     puts "Releasing version #{version}..."
-    
+
     # Create git tag with optional message
     # rake release:version["Fix critical bug in schema validation"]
     if args[:message]
@@ -16,7 +16,7 @@ namespace :release do
       system "git tag v#{version}"
       puts "Created lightweight tag v#{version}"
     end
-    
+
     system "git push origin main"
     system "git push origin v#{version}"
 
diff --git a/spec/ruby_llm/schema_class_inheritance_spec.rb b/spec/ruby_llm/schema_class_inheritance_spec.rb
index f1ed14f..3fbdaea 100644
--- a/spec/ruby_llm/schema_class_inheritance_spec.rb
+++ b/spec/ruby_llm/schema_class_inheritance_spec.rb
@@ -8,7 +8,7 @@
 
     describe "name" do
       it "uses class name when provided (via constant)" do
-        TestNamedSchema = Class.new(described_class)
+        stub_const("TestNamedSchema", Class.new(described_class))
         instance = TestNamedSchema.new
         expect(instance.to_json_schema[:name]).to eq("TestNamedSchema")
       end
@@ -79,13 +79,13 @@
         string :name, description: "Name field"
         integer :count
         boolean :active, required: false
-        
+
         object :config do
           string :setting
         end
-        
+
         array :tags, of: :string
-        
+
         any_of :status do
           string
           null
@@ -121,7 +121,7 @@
         description: "Test description",
         schema: hash_including(
           type: "object",
-          properties: { title: { type: "string" } },
+          properties: {title: {type: "string"}},
           required: [:title],
           additionalProperties: false,
           strict: true
@@ -141,8 +141,8 @@
 
       expect(json_output).to include(
         name: "ConfiguredSchema",
-        description: "Instance description",
+        description: "Instance description"
       )
     end
   end
-end 
\ No newline at end of file
+end
diff --git a/spec/ruby_llm/schema_factory_spec.rb b/spec/ruby_llm/schema_factory_spec.rb
index 9bccc00..04cda40 100644
--- a/spec/ruby_llm/schema_factory_spec.rb
+++ b/spec/ruby_llm/schema_factory_spec.rb
@@ -6,9 +6,9 @@
   describe "configuration options" do
     describe "name" do
       it "uses class name when provided (via constant assignment)" do
-        NamedFactorySchema = described_class.create do
+        stub_const("NamedFactorySchema", described_class.create do
           string :title
-        end
+        end)
 
         instance = NamedFactorySchema.new
         expect(instance.to_json_schema[:name]).to eq("NamedFactorySchema")
@@ -96,13 +96,13 @@
         string :name, description: "Name field"
         integer :count
         boolean :active, required: false
-        
+
         object :config do
           string :setting
         end
-        
+
         array :tags, of: :string
-        
+
         any_of :status do
           string
           null
@@ -138,7 +138,7 @@
         description: "Factory test description",
         schema: hash_including(
           type: "object",
-          properties: { title: { type: "string" } },
+          properties: {title: {type: "string"}},
           required: [:title],
           additionalProperties: false,
           strict: true
@@ -158,8 +158,8 @@
 
       expect(json_output).to include(
         name: "FactoryConfiguredSchema",
-        description: "Instance description",
+        description: "Instance description"
       )
     end
   end
-end 
\ No newline at end of file
+end
diff --git a/spec/ruby_llm/schema_helpers_spec.rb b/spec/ruby_llm/schema_helpers_spec.rb
index bf8d394..5f97eba 100644
--- a/spec/ruby_llm/schema_helpers_spec.rb
+++ b/spec/ruby_llm/schema_helpers_spec.rb
@@ -91,13 +91,13 @@
         string :name, description: "Name field"
         integer :count
         boolean :active, required: false
-        
+
         object :config do
           string :setting
         end
-        
+
         array :tags, of: :string
-        
+
         any_of :status do
           string
           null
@@ -131,7 +131,7 @@
         description: "Helper test description",
         schema: hash_including(
           type: "object",
-          properties: { title: { type: "string" } },
+          properties: {title: {type: "string"}},
           required: [:title],
           additionalProperties: false,
           strict: true
@@ -139,4 +139,4 @@
       )
     end
   end
-end 
\ No newline at end of file
+end
diff --git a/spec/ruby_llm/schema_spec.rb b/spec/ruby_llm/schema_spec.rb
index 2014b11..1616f03 100644
--- a/spec/ruby_llm/schema_spec.rb
+++ b/spec/ruby_llm/schema_spec.rb
@@ -11,7 +11,7 @@
 
     it "supports string type with enum and description" do
       schema_class.string :status, enum: %w[active inactive], description: "Status field"
-      
+
       properties = schema_class.properties
       expect(properties[:status]).to eq({
         type: "string",
@@ -22,7 +22,7 @@
 
     it "supports string type with additional properties" do
       schema_class.string :email, format: "email", min_length: 5, max_length: 100, pattern: "\\S+@\\S+", description: "Email field"
-      
+
       properties = schema_class.properties
       expect(properties[:email]).to eq({
         type: "string",
@@ -36,7 +36,7 @@
 
     it "supports number type with constraints" do
       schema_class.number :price, minimum: 0, maximum: 1000, multiple_of: 0.01, description: "Price field"
-      
+
       properties = schema_class.properties
       expect(properties[:price]).to eq({
         type: "number",
@@ -49,28 +49,28 @@
 
     it "supports number type with description" do
       schema_class.number :price, description: "Price field"
-      
+
       properties = schema_class.properties
       expect(properties[:price]).to eq({type: "number", description: "Price field"})
     end
 
     it "supports integer type with description" do
       schema_class.integer :count, description: "Count value"
-      
+
       properties = schema_class.properties
       expect(properties[:count]).to eq({type: "integer", description: "Count value"})
     end
 
     it "supports boolean type with description" do
       schema_class.boolean :enabled, description: "Enabled field"
-      
+
       properties = schema_class.properties
       expect(properties[:enabled]).to eq({type: "boolean", description: "Enabled field"})
     end
 
     it "supports null type with description" do
       schema_class.null :placeholder, description: "Null field"
-      
+
       properties = schema_class.properties
       expect(properties[:placeholder]).to eq({type: "null", description: "Null field"})
     end
@@ -97,7 +97,7 @@
       schema_class.array :booleans, of: :boolean
 
       properties = schema_class.properties
-      
+
       expect(properties[:strings]).to eq({type: "array", items: {type: "string"}, description: "String array"})
       expect(properties[:numbers]).to eq({type: "array", items: {type: "number"}})
       expect(properties[:integers]).to eq({type: "array", items: {type: "integer"}})
@@ -106,7 +106,7 @@
 
     it "supports arrays with constraints" do
       schema_class.array :strings, of: :string, min_items: 1, max_items: 10, description: "String array"
-      
+
       properties = schema_class.properties
       expect(properties[:strings]).to eq({type: "array", items: {type: "string"}, minItems: 1, maxItems: 10, description: "String array"})
     end
@@ -136,7 +136,7 @@
         string :name
         number :price
       end
-      
+
       schema_class.array :products, of: :product
 
       properties = schema_class.properties
@@ -193,7 +193,7 @@
 
       instance = schema_class.new
       properties = instance.to_json_schema[:schema][:properties]
-      
+
       level3 = properties[:level1][:properties][:level2][:properties][:level3]
       expect(level3[:properties][:deep_value]).to eq({type: "string"})
     end
@@ -210,7 +210,7 @@
 
       properties = schema_class.properties
       any_of_schemas = properties[:flexible_field][:anyOf]
-      
+
       expect(any_of_schemas).to include(
         {type: "string", enum: %w[option1 option2]},
         {type: "integer"},
@@ -269,7 +269,7 @@
 
     it "handles naming correctly" do
       # Named class
-      TestSchemaClass = Class.new(described_class)
+      stub_const("TestSchemaClass", Class.new(described_class))
       named_instance = TestSchemaClass.new
       expect(named_instance.to_json_schema[:name]).to eq("TestSchemaClass")
 
@@ -288,7 +288,7 @@
 
     it "supports method delegation for schema methods" do
       instance = schema_class.new
-      
+
       expect(instance).to respond_to(:string, :number, :integer, :boolean, :array, :object, :any_of, :null)
       expect(instance).not_to respond_to(:unknown_method)
     end
@@ -296,7 +296,7 @@
     it "produces correctly structured JSON schema and JSON output" do
       schema_class.string :name
       schema_class.integer :age, required: false
-      
+
       instance = schema_class.new("TestSchema")
       json_output = instance.to_json_schema
 
@@ -349,7 +349,7 @@
       expect {
         schema_class.array :items, of: :undefined_reference
       }.not_to raise_error
-      
+
       properties = schema_class.properties
       expect(properties[:items][:items]).to eq({"$ref" => "#/$defs/undefined_reference"})
     end
@@ -372,7 +372,7 @@
 
         expect(schema_class.valid?).to be false
         expect { schema_class.validate! }.to raise_error(
-          RubyLLM::Schema::ValidationError, 
+          RubyLLM::Schema::ValidationError,
           /Circular reference detected involving 'user'/
         )
       end
@@ -423,7 +423,7 @@
       empty_schema = Class.new(described_class)
       empty_instance = empty_schema.new("EmptySchema")
       empty_output = empty_instance.to_json_schema
-      
+
       expect(empty_output[:schema][:properties]).to eq({})
       expect(empty_output[:schema][:required]).to eq([])
 
@@ -435,7 +435,7 @@
 
       optional_instance = optional_schema.new
       optional_output = optional_instance.to_json_schema
-      
+
       expect(optional_output[:schema][:required]).to eq([])
       expect(optional_output[:schema][:properties].keys).to contain_exactly(:optional1, :optional2)
     end
@@ -443,15 +443,15 @@
     it "handles complex nested structures with all features" do
       complex_schema = Class.new(described_class) do
         string :id, description: "Unique identifier"
-        
+
         object :metadata do
           string :created_by
           integer :version
           boolean :published, required: false
         end
-        
+
         array :tags, of: :string, description: "Resource tags"
-        
+
         array :items do
           object do
             string :name
@@ -463,17 +463,17 @@
             end
           end
         end
-        
+
         any_of :status do
           string enum: %w[draft published]
           null
         end
-        
+
         define :author do
           string :name
           string :email
         end
-        
+
         array :authors, of: :author
       end
 
@@ -486,7 +486,7 @@
       )
       expect(json_output[:schema]["$defs"][:author]).to be_a(Hash)
       expect(json_output[:schema][:required]).to include(:id, :metadata, :tags, :items, :status, :authors)
-      
+
       # Verify descriptions are preserved
       expect(json_output[:schema][:properties][:id][:description]).to eq("Unique identifier")
       expect(json_output[:schema][:properties][:tags][:description]).to eq("Resource tags")