diff --git a/lib/schemable/schema_modifier.rb b/lib/schemable/schema_modifier.rb
new file mode 100644
index 0000000..7234801
--- /dev/null
+++ b/lib/schemable/schema_modifier.rb
@@ -0,0 +1,142 @@
+module Schemable
+  class SchemaModifier
+    def parse_path(path)
+      path.split('.').map(&:to_sym)
+    end
+
+    def path_exists?(schema, path)
+      path_segments = parse_path(path)
+
+      path_segments.reduce(schema) do |current_segment, next_segment|
+        if current_segment.is_a?(Array)
+          # The regex pattern '/\[(\d+)\]|\d+/' matches square brackets containing one or more digits,
+          # or standalone digits. Used for parsing array indices in a path.
+          index = next_segment.to_s.match(/\[(\d+)\]|\d+/)[1]
+          # The regex pattern '/\A\d+\z/' matches a sequence of one or more digits from the start ('\A')
+          # to the end ('\z') of a string. It checks if a string consists of only digits.
+          return false if index.nil? || !index.match?(/\A\d+\z/) || index.to_i >= current_segment.length
+
+          current_segment[index.to_i]
+        else
+          return false unless current_segment.is_a?(Hash) && current_segment.key?(next_segment)
+
+          current_segment[next_segment]
+        end
+      end
+
+      true
+    end
+
+    def deep_merge_hashes(destination, new_data)
+      if destination.is_a?(Array) && new_data.is_a?(Array)
+        destination.concat(new_data)
+      elsif destination.is_a?(Array) && new_data.is_a?(Hash)
+        destination.push(new_data)
+      elsif destination.is_a?(Hash) && new_data.is_a?(Hash)
+        new_data.each do |key, value|
+          if destination[key].is_a?(Hash) && value.is_a?(Hash)
+            destination[key] = deep_merge_hashes(destination[key], value)
+          elsif destination[key].is_a?(Array) && value.is_a?(Array)
+            destination[key].concat(value)
+          elsif destination[key].is_a?(Array) && value.is_a?(Hash)
+            destination[key].push(value)
+          else
+            destination[key] = value
+          end
+        end
+      end
+
+      destination
+    end
+
+    def add_properties(original_schema, new_schema, path)
+      return deep_merge_hashes(original_schema, new_schema) if path == '.'
+
+      unless path_exists?(original_schema, path)
+        puts "Error: Path '#{path}' does not exist in the original schema"
+        return original_schema
+      end
+
+      path_segments = parse_path(path)
+      current_segment = original_schema
+      last_segment = path_segments.pop
+
+      # Navigate to the specified location in the schema
+      path_segments.each do |segment|
+        if current_segment.is_a?(Array)
+          index = segment.to_s.match(/\[(\d+)\]|\d+/)[1]
+          if index&.match?(/\A\d+\z/) && index.to_i < current_segment.length
+            current_segment = current_segment[index.to_i]
+          else
+            puts "Error: Invalid index in path '#{path}'"
+            return original_schema
+          end
+        elsif current_segment.is_a?(Hash) && current_segment.key?(segment)
+          current_segment = current_segment[segment]
+        else
+          puts "Error: Expected a Hash but found #{current_segment.class} in path '#{path}'"
+          return original_schema
+        end
+      end
+
+      # Merge the new schema into the specified location
+      if current_segment.is_a?(Array)
+        index = last_segment.to_s.match(/\[(\d+)\]|\d+/)[1]
+        if index&.match?(/\A\d+\z/) && index.to_i < current_segment.length
+          current_segment[index.to_i] = deep_merge_hashes(current_segment[index.to_i], new_schema)
+        else
+          puts "Error: Invalid index in path '#{path}'"
+        end
+      else
+        current_segment[last_segment] = deep_merge_hashes(current_segment[last_segment], new_schema)
+      end
+
+      original_schema
+    end
+
+    def delete_properties(original_schema, path)
+      return original_schema if path == '.'
+
+      unless path_exists?(original_schema, path)
+        puts "Error: Path '#{path}' does not exist in the original schema"
+        return original_schema
+      end
+
+      path_segments = parse_path(path)
+      current_segment = original_schema
+      last_segment = path_segments.pop
+
+      # Navigate to the parent of the last segment in the path
+      path_segments.each do |segment|
+        if current_segment.is_a?(Array)
+          index = segment.to_s.match(/\[(\d+)\]|\d+/)[1]
+          if index&.match?(/\A\d+\z/) && index.to_i < current_segment.length
+            current_segment = current_segment[index.to_i]
+          else
+            puts "Error: Invalid index in path '#{path}'"
+            return original_schema
+          end
+        elsif current_segment.is_a?(Hash) && current_segment.key?(segment)
+          current_segment = current_segment[segment]
+        else
+          puts "Error: Expected a Hash but found #{current_segment.class} in path '#{path}'"
+          return original_schema
+        end
+      end
+
+      # Delete the last segment in the path
+      if current_segment.is_a?(Array)
+        index = last_segment.to_s.match(/\[(\d+)\]|\d+/)[1]
+        if index&.match?(/\A\d+\z/) && index.to_i < current_segment.length
+          current_segment.delete_at(index.to_i)
+        else
+          puts "Error: Invalid index in path '#{path}'"
+        end
+      else
+        current_segment.delete(last_segment)
+      end
+
+      original_schema
+    end
+  end
+end
diff --git a/sig/schemable/schema_modifier.rbs b/sig/schemable/schema_modifier.rbs
new file mode 100644
index 0000000..76fa6f8
--- /dev/null
+++ b/sig/schemable/schema_modifier.rbs
@@ -0,0 +1,42 @@
+# == SchemaModifier
+#
+# This module provides methods for working with Hash/JSON-like schemas.
+# It includes methods to parse paths, check if a path exists in a schema,
+# deep merge two hashes or an array and a hash, add properties to a specific
+# location in a schema, and delete properties at a specified path.
+#
+# === Examples
+#
+#   schema_modifier = Schemable::SchemaModifier.new
+#
+#   path = "properties.name.items.[0].properties.age"
+#   parsed_path = schema_modifier.parse_path(path)
+#   # => [:properties, :name, :items, :'[0]', :properties, :age]
+#
+#   schema = { properties: { name: "John" } }
+#   exists = schema_modifier.path_exists?(schema, "properties.name")
+#   # => true
+#
+#   new_data = { age: 25 }
+#   merged_data = schema_modifier.deep_merge_hashes({ name: "John" }, new_data)
+#   # => { name: "John", age: 25 }
+#
+#   original_schema = { properties: { name: "John" } }
+#   new_schema = { age: 25 }
+#   updated_schema = schema_modifier.add_properties(original_schema, new_schema, "properties")
+#   # => { properties: { name: "John", age: 25 } }
+#
+#   schema = { properties: { name: "John", age: 25 } }
+#   path_to_delete = "properties.name.age"
+#   updated_schema = schema_modifier.delete_properties(schema, path_to_delete)
+#   # => { properties: { name: "John" } }
+#
+module Schemable
+  class SchemaModifier
+    def parse_path: (path: String) -> Array[Symbol]
+    def path_exists?: (schema: Hash[Symbol, any], path: String) -> bool
+    def deep_merge_hashes: (destination: Hash[Symbol, any], new_data: Hash[Symbol, any]) -> (Hash[Symbol, any] | Array[any])
+    def add_properties: (original_schema: (Hash[Symbol, any] | Array[any]), new_schema: Hash[Symbol, any], path: String) -> (Hash[Symbol, any] | Array[any])
+    def delete_properties: (original_schema: (Hash[Symbol, any] | Array[any]), path: String) -> (Hash[Symbol, any] | Array[any])
+  end
+end