EVE Online started migrating 2.4 million lines off Stackless Python 2.7, with no LLM tooling in the plan.

CCP announced the migration covering code that has run on Stackless 2.7 since 2010. The approach is to run futurize across the codebase and then manually review roughly 20,000 places where Python 2 and 3 behavior diverges, including integer division (Simon Willison). No completion date given, and no mention of agents anywhere. That's a useful counterweight to the claim that large migrations are now an agent problem, from a team with 16 years of context on the specific codebase.