but if say I have a long shell script, or I have a long build job failed middle way, can it locate the relevant errors in the log?
Often times, when these longer scripts / build jobs fail, they'll emit an error at the _end_, so sharing the tail should work in this case. But, you can always tweak (add / subtract) from what you want to share with the AI to make the query even more focused.
Does that address your use-case?
So often, the first line of error is where I need to look. But for a long log, locating it is not that easy.