server/utils/helpers/tiktoken.js

Instead of encoding the input string twice (once in tokensFromString and once in countFromString), you can call tokensFromString inside countFromString to avoid duplicate work. This will improve the performance of your code.
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    countFromString(input = "") {
      const tokens = this.tokensFromString(input);
      return tokens.length;
    }

git fetch origin && git checkout -b ReviewBot/Impro-8nr69hp origin/ReviewBot/Impro-8nr69hp

It would be helpful to add a comment explaining why the second and third parameters of the encode method are undefined and an empty array respectively. This will improve the readability of your code and make it easier for others to understand.
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    // The second parameter is set to undefined and the third parameter is set to an empty array for [reason]
    const tokens = this.encoder.encode(input, undefined, []);

git fetch origin && git checkout -b ReviewBot/Impro-3owmk7b origin/ReviewBot/Impro-3owmk7b