title: How to add @ mention in response to slash commands in slack
body: <p>How can I make slack parse <code>@someone</code> mentions as links to the user instead of plaintext. I've been reading slack documentation on message formatting but still haven't figured it out. Here's an example of what I'm getting now:</p>
  
  <pre><code>{
    "text": "*username:* @alexis",
    "response_type": "ephemeral"
  }
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/oSUjM.png" rel="noreferrer"><img src="https://i.stack.imgur.com/oSUjM.png" alt="mention not parsed as link"></a></p>