ong> back to the <code>sharedState</code> and decide the next Action.  </li>
<li>Examples: <em>update DB, change states, log results, decide next Action</em>.  </li>
<li>Returns a <strong>string</strong> specifying the next Action (e.g. <code>"default"</code> if none is specified).</li>
</ol>
<blockquote>
<p>Not all Nodes need all three steps. You could implement only <code>prepAsync()</code> if you just need to prepare data without calling an LLM.<br />
{: .note }</p>
</blockquote>
<hr />
<h2 id="fault-tol