Pick the tool for a 40-file logger migration

40 TypeScript files call a deprecated logger.warn(msg, meta), and every call needs to become logger.warn({ msg, meta }). A colleague started an autonomous coding agent with "migrate all logger calls across the repo". 20 minutes later, it is still re-reading files and second-guessing its edits.

Would you have used an autonomous agent here? Say what you would do, and why.