Work doesn't start with a PR description though. I'm assuming most people that are using LLMs start with some sort of document (plan, spec, intent, etc) which captures intent.

I guess you could also use all the session rollouts saved to disk that were related to that task, and distill them somehow.

The difference is an LLM can convert a stream of consciousness into well-formed prose for approximately free; I assume ‘provide some context’ means ‘brain dump’ in the OP