5 sessions on ruff with a coding agent: the agent failed at least once in 2, and 1 finished without a human stepping in.
Takeaway: Next time I'd open with the parallel-work caveat up front — telling it about the concurrent chart-engine branch early saved a lot of back-and-forth about which files were safe to touch.
Takeaway: Next time I'd flag upfront that the PR should stay scoped to bar charts only, so the agent doesn't fold waterfall-chart commits into the same squashed history it has to unpick later.
Takeaway: I'd start by asking for the duplication cleanup and the pyright strictness fix in the same pass, since touching sizing/renderer/verification together was always going to surface type issues in cli.py too.
Takeaway: Next time I'd start by asking it to reproduce the bug locally with a runnable demo script before touching routes.py, since the first demo attempt crashed and wasted a cycle.