It's been especially helpful in explaining and understanding arcane bits of legacy code behavior my users ask about. I trigger Claude to examine the code and figure out how the feature works, then tell it to update the documentation accordingly.
And how do you verify its output isn't total fabrication?
Inconsistencies also pop up in backtesting, for example if there's a point that the llm answers different ways in multiple iterations, that's a good candidate to improve docs on.
Similar to a coworker's work, there's a certain amount of trust in the competency involved.
For example, I have it ignore messages about code freezes, because that's a policy question that probably changes over time, and I have it ignore urgent oncall messages, because the asker there probably wants a quick response from a human.
But there's a lot of questions in the vein of "How do I write a query for {results my service emits}", how does this feature work, where automation can handle a lot (and provide more complete answers than a human can off the top of their head)