gistfile1.php

<?php

// Base of any runner
abstract class Runner {
    public abstract function run();
}

abstract class Configuration {
    // TODO validation, defaults etc.
}

trait Console {
    public function say($text) {
        echo $text;
    }
}

// A user-defined tool =================================================================================================

class ToolConfiguration extends Configuration {
    private $parameter;

    public function setParameter($parameter) {
        $this->parameter = $parameter;
    }

    public function getParameter() {
        return $this->parameter;
    }
}

class ToolRunner extends Runner {

    use Console;

    private $configuration;

    public function __construct(ToolConfiguration $configuration) {
        $this->configuration = $configuration;
    }

    public function run() {
        $this->say($this->configuration->getParameter());
    }
}

trait Tool {
    public function tool(ToolConfiguration $configuration) {
        $runner = new ToolRunner($configuration);
        $runner->run();
    }
}

// list of commands
class Commands {

    use Tool, Console;

    public function command() {
        $this->say('Answer is: ');
        
        $toolConfiguration = new ToolConfiguration();
        $toolConfiguration->setParameter(42);
        
        $this->tool($toolConfiguration);
    }

}