diff --git a/.rspec b/.rspec
deleted file mode 100644
index dd90eb63e..000000000
--- a/.rspec
+++ /dev/null
@@ -1,2 +0,0 @@
---require ./hearth/spec/spec_helper
--I ./hearth/lib
\ No newline at end of file
diff --git a/hearth/.rspec b/hearth/.rspec
deleted file mode 100644
index c99d2e739..000000000
--- a/hearth/.rspec
+++ /dev/null
@@ -1 +0,0 @@
---require spec_helper
diff --git a/hearth/lib/hearth.rb b/hearth/lib/hearth.rb
index a0057f0a0..c05fa862b 100755
--- a/hearth/lib/hearth.rb
+++ b/hearth/lib/hearth.rb
@@ -58,6 +58,7 @@
 module Hearth
   VERSION = File.read(File.expand_path('../VERSION', __dir__)).strip
 
+  # @api private
   @config = {}
 
   class << self
diff --git a/hearth/lib/hearth/config/resolver.rb b/hearth/lib/hearth/config/resolver.rb
index 19a5467ce..9fa528c43 100644
--- a/hearth/lib/hearth/config/resolver.rb
+++ b/hearth/lib/hearth/config/resolver.rb
@@ -1,58 +1,5 @@
 # frozen_string_literal: true
 
-# module Hearth
-#   # @api private
-#   module Config
-#     # Resolves configuration defaults.
-#     class Resolver
-#       private_class_method :new
-#
-#       # @param config [Struct]
-#       # @param defaults [Hash<Symbol, Array>]
-#       # @return [Struct]
-#       def self.resolve(config, defaults = {})
-#         new(config).send(:resolve, defaults)
-#       end
-#
-#       def [](key)
-#         unless @resolved[key]
-#           @config[key] = resolve_default(key)
-#           @resolved[key] = true
-#         end
-#         @config[key]
-#       end
-#
-#       private
-#
-#       # @param config [Struct]
-#       def initialize(config)
-#         @config = config
-#         @resolved = {}
-#       end
-#
-#       def resolve(defaults)
-#         @defaults = defaults
-#         @config.members.each do |key|
-#           @config[key] = self[key]
-#         end
-#       end
-#
-#       def resolve_default(key)
-#         @defaults[key]&.each do |default|
-#           value =
-#             if default.respond_to?(:call)
-#               default.call(self)
-#             else
-#               default
-#             end
-#           return value unless value.nil?
-#         end
-#         nil
-#       end
-#     end
-#   end
-# end
-
 module Hearth
   # @api private
   module Config
diff --git a/hearth/lib/hearth/configuration.rb b/hearth/lib/hearth/configuration.rb
index 90f735550..3df757abc 100644
--- a/hearth/lib/hearth/configuration.rb
+++ b/hearth/lib/hearth/configuration.rb
@@ -10,7 +10,7 @@ def initialize(**options)
     end
 
     # @return [Hash<Symbol, Object>] The original configuration options.
-    attr_accessor :options
+    attr_reader :options
 
     def merge(configuration)
       self.class.new(**to_h.merge(configuration.to_h))
diff --git a/hearth/sig/lib/hearth.rbs b/hearth/sig/lib/hearth.rbs
new file mode 100644
index 000000000..e3bfffc81
--- /dev/null
+++ b/hearth/sig/lib/hearth.rbs
@@ -0,0 +1,7 @@
+module Hearth
+  VERSION: String
+
+  attr_reader self.config: Hash[Symbol, untyped]
+
+  def self.config=: (Hash[Symbol, untyped] config) -> Hash[Symbol, untyped]
+end
diff --git a/hearth/sig/lib/hearth/configuration.rbs b/hearth/sig/lib/hearth/configuration.rbs
index 5170a818f..6e537a36d 100644
--- a/hearth/sig/lib/hearth/configuration.rbs
+++ b/hearth/sig/lib/hearth/configuration.rbs
@@ -2,6 +2,8 @@ module Hearth
   module Configuration[ServiceConfig]
     def initialize: (**Hash[Symbol, untyped] options) -> void
 
+    attr_reader options: Hash[Symbol, untyped]
+
     def merge: (Hash[Symbol, untyped] configuration) -> ServiceConfig
   end
 end
diff --git a/hearth/spec/spec_helper.rb b/hearth/spec/spec_helper.rb
index 5052ed742..0294a2bf1 100644
--- a/hearth/spec/spec_helper.rb
+++ b/hearth/spec/spec_helper.rb
@@ -1,5 +1,13 @@
 # frozen_string_literal: true
 
+require 'simplecov'
+SimpleCov.minimum_coverage 100
+SimpleCov.start do
+  add_filter %r{/spec/}
+end
+
+require 'hearth'
+
 # This file was generated by the `rspec --init` command. Conventionally, all
 # specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
 # The generated `.rspec` file contains `--require spec_helper` which will cause
@@ -16,14 +24,6 @@
 #
 # See https://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
 
-require 'simplecov'
-SimpleCov.minimum_coverage 100
-SimpleCov.start do
-  add_filter %r{/spec/}
-end
-
-require 'hearth'
-
 RSpec.configure do |config|
   # rspec-expectations config goes here. You can use an alternate
   # assertion/expectation library such as wrong or the stdlib/minitest