I gave a coding agent a real maintainer chore on the largest open-source Rails monolith there is, and recorded the whole session. Then I gave it the same chore with a map of the codebase and recorded that one too.
What follows is the play-by-play. The agent's moves are real, lightly trimmed for length; my commentary is the indented notes between them. Watch where the first run stops, and why it doesn't know it stopped.
The repo is GitLab, indexed at a pinned commit:
gitlabhq @ 1f9c256f0
tracked files / ruby 68,289 / 29,784
