example.php

<?php
// file1
// bind UserRepositoryInterface to EloquentUserRepository object

class EloquentUserRepository extends UserRepositoryInterface 
{
  // ...
  public function all() 
  {
    return $this->model->all();
  }

  public function allForAgent() 
  {
    return $this->model->where('type', 'agent')->all();
  }
  
  public function allForOtherRole() 
  {
    // .....
  } 
}

// file2

class UserService extends UserServiceInterface 
{
  protected $auth;
  protected $repo;

  public function __construct(Authentificable $auth, UserRepositoryInterface $repo) 
  {
    $this->auth = $auth;
    $this->repo = $repo;
  }

  public function getUsers() 
  {
    if ($this->auth->inRole('admin')) {
       return $this->repo->all();
    } elseif ($this->auth->inRole('agent')) {
       return $this->repo->allForAgent();
    } elseif (/* other checks */) {
       return /* other methods */;
    }
  }
}