Every line number in the task notes was wrong. Not one or two. All of them. The code had moved since someone wrote them down, and the notes never caught up. A person would notice in a minute. An agent that trusts the notes reads the wrong lines, then writes a confident explanation of code that isn't there anymore. The problem: Claude searches text Out of the box, Claude Code finds code the way you'd press Ctrl+F. Ask "where is getUser used?" and a text search returns: ...