ry if there's an error
  public async execFallbackAsync(
    sharedState: any,
    prepResult: string,
    err: Error
  ): Promise&lt;string&gt; {
    console.error(&quot;LLM call failed:&quot;, err);
    return &quot;There was an error processing your request.&quot;;
  }

  // postAsync: store the result in sharedState and return &quot;default&quot;
  public async postAsync(sharedState: any, prepResult: string, execResult: string): Promise&lt;string&gt; {
    const filename = this.params[&quot;filename&quo