diff --git a/README.md b/README.md
index 41d3ee6..cc920ea 100644
--- a/README.md
+++ b/README.md
@@ -134,60 +134,58 @@ class MyProductsIndexer < AiAgent::Embeddings::Indexers::BaseIndexer
 end
 ```
 
-# External tools usage(DEVIN)
+# External tools usage(DEVIN like)
 ```ruby
 class EvaluateRubyCodeAgent < AiAgent::Agents::BasicAgentWithTools
   config do |c|
     c.who_am_i = <<~WHO_AM_I
-        I am a ruby programming agent agent, i use my tools to evaluate ruby code
+      I have multiple roles, here are some of them:
+      - #{AiAgent::Tools::Ruby::EvaluateRubyTool.who_am_i_description}
     WHO_AM_I
 
     c.ollama_model = 'llama3.1' # you need a model with tools
   end
 
   def tools
-    @tools ||= {
+    @tools ||= [
+      evaluate_ruby_tool.tool_definition,
+    ].inject({}) do |h, tool|
+      h.merge(tool)
+    end.deep_merge({
       evaluate_ruby: {
-        execute: ->(params) do
-          code = params['code']
-          output = evaluate_ruby_tool.evaluate(code)
-          AiAgent::Conversation::Message.new(:tool, output) # you need to return a message
-        end,
-        description: 'Evaluates Ruby code',
-        parameters: {
-          type: 'string',
-          description: 'The Ruby code to evaluate'
-        },
-        required: ['code']
-      },
-      ask_user: {
-        execute: ->(params) do
-          question = params['question']
-          puts question
-          answer = gets.chomp
-          stop if answer == 'exit'
-          answer
-        end,
-        description: 'Asks the user a question',
-        parameters: {
-          type: 'string',
-          description: 'The question to ask the user'
-        },
-        required: ['question']
+        before_execute: ->(params) do
+          puts params['code'].colorize(:green)
+        end
       }
-    }
+    })
   end
 
   private
     def evaluate_ruby_tool
       @evaluate_ruby_tool ||= AiAgent::Tools::Ruby::EvaluateRubyTool.new(self)
     end
+      def show_normal_response(content)
+        puts content
+      end
+
+      def ask_for_user_input
+        print '> '
+        response = gets.chomp
+        exit if response == 'exit'
+        AiAgent::Conversation::Message.new(:user, response)
+      end
+
+      def show_tool_call_explanation(tool_call)
+        puts 'Ai: '.colorize(:magenta) + tool_call.explanation
+      end
 end
 
 agent = EvaluateRubyCodeAgent.new([]) # [] is the history of messages
 agent.run_in_loop
 ```
 
+Check for more tools in `lib/ai_agent/tools`
+
 # Rails Integration
 #### Example 1) Standalone Chat Agent
 ```ruby
@@ -242,10 +240,6 @@ class AiConversationsController < ApplicationController
 end
 ```
 
-# 🔮 Future Plans
-
-- 🛠️ Ability for agents to execute tasks independently
-
 # 🛠️ Development
 After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.
 To install this gem onto your local machine, run bundle exec rake install.
diff --git a/lib/ai_agent/agents/basic_agent_with_tools.rb b/lib/ai_agent/agents/basic_agent_with_tools.rb
index 30cab84..ba8c0b0 100644
--- a/lib/ai_agent/agents/basic_agent_with_tools.rb
+++ b/lib/ai_agent/agents/basic_agent_with_tools.rb
@@ -48,6 +48,10 @@ def serialize_tools
                 type: :string,
                 description: 'Explain the reason for the tool call'
               }
+
+              t_options[:parameters][:required].tap do |required|
+                required << '__explain' if required && required.include?('__explain')
+              end
             end
 
             {
diff --git a/lib/ai_agent/tools/os/execute_command.rb b/lib/ai_agent/tools/os/execute_command.rb
index 0877129..a6d1e42 100644
--- a/lib/ai_agent/tools/os/execute_command.rb
+++ b/lib/ai_agent/tools/os/execute_command.rb
@@ -8,6 +8,12 @@ def self.who_am_i_description
           "I have access to the system's shell and can execute commands."
         end
 
+        def initialize(agent, sudo: false, root: false)
+          super(agent)
+          @sudo = sudo
+          @root = root
+        end
+
         def execute_command(command, path)
           command = "cd #{path} && #{command}"
           result = Open3.capture3(command)
@@ -36,7 +42,7 @@ def tool_definition
               rescue RuntimeError => e
                 AiAgent::Conversation::Message.new(:tool, "Error executing command: #{e.inspect}")
               end,
-              description: "Executes a command in the system's shell.",
+              description: "Executes a command in the system's shell. Use this tool to execute commands in the system's shell. Sudo access: #{@sudo}, root access: #{@root}.",
               parameters: {
                 type: 'object',
                 properties: {
@@ -58,7 +64,7 @@ def tool_definition
                 path = params['path'] || Dir.pwd
                 AiAgent::Conversation::Message.new(:tool, execute_command_in_background(command, path))
               end,
-              description: "Executes a command in the system's shell in the background.",
+              description: "Executes a command in the system's shell in the background. Use this tool to execute commands in the system's shell in the background. Sudo access: #{@sudo}, root access: #{@root}",
               parameters: {
                 type: 'object',
                 properties: {
diff --git a/lib/ai_agent/tools/os/file_system.rb b/lib/ai_agent/tools/os/file_system.rb
index 0bddc22..f72f309 100644
--- a/lib/ai_agent/tools/os/file_system.rb
+++ b/lib/ai_agent/tools/os/file_system.rb
@@ -132,7 +132,7 @@ def tool_definition
                 content = read_file(params['path'])
                 AiAgent::Conversation::Message.new(:tool, content)
               end,
-              description: 'Reads the content of a file.',
+              description: 'Reads the content of a file. Use this tool to read the content of a file.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -150,7 +150,7 @@ def tool_definition
                 write_file(path, params['content'])
                 AiAgent::Conversation::Message.new(:tool, "Wrote to #{path}")
               end,
-              description: 'Writes content to a file.',
+              description: 'Writes content to a file. Use this tool to write content to a file.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -171,8 +171,10 @@ def tool_definition
                 path = params['path']
                 write_file_binary(path, params['content'])
                 AiAgent::Conversation::Message.new(:tool, "Wrote binary to #{path}")
+              rescue Errno::ENOENT
+                AiAgent::Conversation::Message.new(:tool, "File not found #{path}")
               end,
-              description: 'Writes binary content to a file.',
+              description: 'Writes binary content to a file. Use this tool to write binary content to a file.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -194,8 +196,10 @@ def tool_definition
                 path = params['path']
                 append_to_file(path, params['content'])
                 AiAgent::Conversation::Message.new(:tool, "Appended to #{path}")
+              rescue Errno::ENOENT
+                AiAgent::Conversation::Message.new(:tool, "File not found #{path}")
               end,
-              description: 'Appends content to a file.',
+              description: 'Appends content to a file. Use this tool to append content to a file.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -217,7 +221,7 @@ def tool_definition
                 replace_in_file(path, params['search'], params['replace'])
                 AiAgent::Conversation::Message.new(:tool, "Replaced in #{path}")
               end,
-              description: 'Replaces content in a file.',
+              description: 'Replaces content in a file. Use this tool to replace content in a file.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -242,7 +246,7 @@ def tool_definition
                 delete_file(params['path'])
                 AiAgent::Conversation::Message.new(:tool, "Deleted #{params['path']}")
               end,
-              description: 'Deletes a file.',
+              description: 'Deletes a file. Use this tool to delete a file.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -259,7 +263,7 @@ def tool_definition
                 exists = file_exists?(params['path'])
                 AiAgent::Conversation::Message.new(:tool, "File exists: #{exists}")
               end,
-              description: 'Checks if a file exists.',
+              description: 'Checks if a file exists. Use this tool to check if a file exists.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -276,7 +280,7 @@ def tool_definition
                 exists = directory_exists?(params['path'])
                 AiAgent::Conversation::Message.new(:tool, "Directory exists: #{exists}")
               end,
-              description: 'Checks if a directory exists.',
+              description: 'Checks if a directory exists. Use this tool to check if a directory exists.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -293,7 +297,7 @@ def tool_definition
                 create_directory(params['path'])
                 AiAgent::Conversation::Message.new(:tool, "Created #{params['path']}")
               end,
-              description: 'Creates a directory.',
+              description: 'Creates a directory. Use this tool to create a directory.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -310,7 +314,7 @@ def tool_definition
                 delete_directory(params['path'])
                 AiAgent::Conversation::Message.new(:tool, "Deleted #{params['path']}")
               end,
-              description: 'Deletes a directory.',
+              description: 'Deletes a directory. Use this tool to delete a directory.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -327,7 +331,7 @@ def tool_definition
                 copy_file(params['source'], params['destination'])
                 AiAgent::Conversation::Message.new(:tool, "Copied #{params['source']} to #{params['destination']}")
               end,
-              description: 'Copies a file.',
+              description: 'Copies a file. Use this tool to copy a file.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -348,7 +352,7 @@ def tool_definition
                 move_file(params['source'], params['destination'])
                 AiAgent::Conversation::Message.new(:tool, "Moved #{params['source']} to #{params['destination']}")
               end,
-              description: 'Moves a file.',
+              description: 'Moves a file. Use this tool to move a file.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -369,7 +373,7 @@ def tool_definition
                 copy_directory(params['source'], params['destination'])
                 AiAgent::Conversation::Message.new(:tool, "Copied #{params['source']} to #{params['destination']}")
               end,
-              description: 'Copies a directory.',
+              description: 'Copies a directory. Use this tool to copy a directory.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -390,7 +394,7 @@ def tool_definition
                 move_directory(params['source'], params['destination'])
                 AiAgent::Conversation::Message.new(:tool, "Moved directory #{params['source']} to #{params['destination']}")
               end,
-              description: 'Moves a directory.',
+              description: 'Moves a directory. Use this tool to move a directory.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -411,7 +415,7 @@ def tool_definition
                 files = list_files(params['path'])
                 AiAgent::Conversation::Message.new(:tool, files.join("\n"))
               end,
-              description: 'Lists files in a directory.',
+              description: 'Lists files in a directory. Use this tool to list files in a directory.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -428,7 +432,7 @@ def tool_definition
                 directories = list_directories(params['path'])
                 AiAgent::Conversation::Message.new(:tool, directories.join("\n"))
               end,
-              description: 'Lists directories in a directory.',
+              description: 'Lists directories in a directory. Use this tool to list subdirectories in a directory.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -445,7 +449,7 @@ def tool_definition
                 items = list_files_and_directories(params['path'])
                 AiAgent::Conversation::Message.new(:tool, items.join("\n"))
               end,
-              description: 'Lists both files and directories in a directory.',
+              description: 'Lists both files and directories in a directory. Use this tool to list both files and directories in a directory.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -462,7 +466,7 @@ def tool_definition
                 files = list_files_recursive(params['path'])
                 AiAgent::Conversation::Message.new(:tool, files.join("\n"))
               end,
-              description: 'Lists files recursively in a directory.',
+              description: 'Lists files recursively in a directory. Use this tool to list files from a directory recursively.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -479,7 +483,7 @@ def tool_definition
                 directories = list_directories_recursive(params['path'])
                 AiAgent::Conversation::Message.new(:tool, directories.join("\n"))
               end,
-              description: 'Lists directories recursively in a directory.',
+              description: 'Lists directories recursively in a directory. Use this tool to list subdirectories from a directory recursively.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -496,7 +500,7 @@ def tool_definition
                 items = list_files_and_directories_recursive(params['path'])
                 AiAgent::Conversation::Message.new(:tool, items.join("\n"))
               end,
-              description: 'Lists both files and directories recursively in a directory.',
+              description: 'Lists both files and directories recursively in a directory. Use this tool to list both files and directories from a directory recursively.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -512,8 +516,10 @@ def tool_definition
               execute: ->(params) do
                 size = file_size(params['path'])
                 AiAgent::Conversation::Message.new(:tool, size.to_s)
+              rescue Errno::ENOENT
+                AiAgent::Conversation::Message.new(:tool, "File not found #{params['path']}")
               end,
-              description: 'Gets the size of a file in bytes.',
+              description: 'Gets the size of a file in bytes. Use this tool to get the size of a file in bytes.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -529,8 +535,10 @@ def tool_definition
               execute: ->(params) do
                 size = file_size_human(params['path'])
                 AiAgent::Conversation::Message.new(:tool, size)
+              rescue Errno::ENOENT
+                AiAgent::Conversation::Message.new(:tool, "File not found #{params['path']}")
               end,
-              description: 'Gets the size of a file in human-readable format.',
+              description: 'Gets the size of a file in human-readable format. Use this tool to get the size of a file in human-readable format.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -547,7 +555,7 @@ def tool_definition
                 type = file_type(params['path'])
                 AiAgent::Conversation::Message.new(:tool, type)
               end,
-              description: 'Gets the MIME type of a file.',
+              description: 'Gets the MIME type of a file. Use this tool to get the MIME type of a file.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -564,7 +572,7 @@ def tool_definition
                 mime_type = file_mime_type(params['path'])
                 AiAgent::Conversation::Message.new(:tool, mime_type)
               end,
-              description: 'Gets the MIME type of a file.',
+              description: 'Gets the MIME type of a file. Use this tool to get the MIME type of a file.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -581,7 +589,7 @@ def tool_definition
                 extension = file_extension(params['path'])
                 AiAgent::Conversation::Message.new(:tool, extension)
               end,
-              description: 'Gets the extension of a file.',
+              description: 'Gets the extension of a file. Use this tool to get the extension of a file.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -598,7 +606,7 @@ def tool_definition
                 name = file_name(params['path'])
                 AiAgent::Conversation::Message.new(:tool, name)
               end,
-              description: 'Gets the name of a file.',
+              description: 'Gets the name of a file. Use this tool to get the name of a file.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -615,7 +623,7 @@ def tool_definition
                 name = file_name_without_extension(params['path'])
                 AiAgent::Conversation::Message.new(:tool, name)
               end,
-              description: 'Gets the name of a file without its extension.',
+              description: 'Gets the name of a file without its extension. Use this tool to get the name of a file without its extension.',
               parameters: {
                 type: 'object',
                 properties: {
@@ -632,7 +640,7 @@ def tool_definition
                 path = file_path(params['path'])
                 AiAgent::Conversation::Message.new(:tool, path)
               end,
-              description: 'Gets the directory path of a file.',
+              description: 'Gets the directory path of a file. Use this tool to get the directory path of a file.',
               parameters: {
                 type: 'object',
                 properties: {
diff --git a/lib/ai_agent/tools/ruby/evaluate_ruby_tool.rb b/lib/ai_agent/tools/ruby/evaluate_ruby_tool.rb
index 232b66d..1e583e7 100644
--- a/lib/ai_agent/tools/ruby/evaluate_ruby_tool.rb
+++ b/lib/ai_agent/tools/ruby/evaluate_ruby_tool.rb
@@ -29,7 +29,7 @@ def tool_definition
                   AiAgent::Conversation::Message.new(:tool, 'Error evaluating Ruby code', metadata: { error: e.inspect, backtrace: e.backtrace })
                 end
               end,
-              description: "Evaluates Ruby code, it's running in a binding, so you can define variables and use them in the next calls",
+              description: "Evaluates Ruby code, it's running in a binding, so you can define variables/methods/classes and use them in the next calls",
               parameters: {
                 type: 'object',
                 properties: {
@@ -37,9 +37,13 @@ def tool_definition
                     type: 'string',
                     description: 'The Ruby code to evaluate'
                   },
+                  __explain: {
+                    type: :string,
+                    description: 'Human readable explanation of the tool code'
+                  }
                 },
+                required: %w[code __explain]
               },
-              required: ['code']
             }
           }
         end
diff --git a/playground/ruby_evaluate_agent.rb b/playground/evaluate_ruby_code_agent.rb
similarity index 66%
rename from playground/ruby_evaluate_agent.rb
rename to playground/evaluate_ruby_code_agent.rb
index 3fb65c0..70c822b 100644
--- a/playground/ruby_evaluate_agent.rb
+++ b/playground/evaluate_ruby_code_agent.rb
@@ -8,9 +8,6 @@ class EvaluateRubyCodeAgent < AiAgent::Agents::BasicAgentWithTools
     c.who_am_i = <<~WHO_AM_I
       I have multiple roles, here are some of them:
       - #{AiAgent::Tools::Ruby::EvaluateRubyTool.who_am_i_description}
-      - #{AiAgent::Tools::Os::ExecuteCommand.who_am_i_description}
-
-      Prioritize using ruby tools, only use execute_command if you need to run a system command.#{' '}
     WHO_AM_I
 
     c.ollama_model = 'llama3.1' # you need a model with tools
@@ -19,26 +16,21 @@ class EvaluateRubyCodeAgent < AiAgent::Agents::BasicAgentWithTools
   def tools
     @tools ||= [
       evaluate_ruby_tool.tool_definition,
-      execute_command_tool.tool_definition,
-      # file_system_tool.tool_definition
     ].inject({}) do |h, tool|
       h.merge(tool)
-    end.deep_merge({})
+    end.deep_merge({
+      evaluate_ruby: {
+        before_execute: ->(params) do
+          puts params['code'].colorize(:green)
+        end
+      }
+   })
   end
 
   private
     def evaluate_ruby_tool
       @evaluate_ruby_tool ||= AiAgent::Tools::Ruby::EvaluateRubyTool.new(self)
     end
-
-    def file_system_tool
-      @file_system_tool ||= AiAgent::Tools::Os::FileSystem.new(self)
-    end
-
-    def execute_command_tool
-      @execute_command_tool ||= AiAgent::Tools::Os::ExecuteCommand.new(self)
-    end
-
     def show_normal_response(content)
       puts content
     end
@@ -56,6 +48,6 @@ def show_tool_call_explanation(tool_call)
 end
 
 EvaluateRubyCodeAgent.new([]).tap do |agent|
-  agent.initial_message = 'What ruby version I have?'
+  agent.initial_message = 'What ruby version I have? Use "evaluate" tool to find out.'
   agent.run_in_loop
 end