I used to experience those issues a lot. I haven't in a while. Between having good documentation in my projects, well-defined skills for normal things, simple to use testing tools, and giving it clear requirements things go pretty smoothly.

I'd say it still really depends on what you're doing. Are you working in a poorly documented language that few people use solving problems few people have solved? Are you adding yet another normal-ish kind of feature in a super common language and libraries? One will have a lot more pain than the other, especially if you're not supplying your own docs and testing tools.

There's also just a difference of what to include in the context. I had three different projects which were tightly coupled. AI agents had a hard time keeping things straight as APIs changed between them, constantly misnaming them and getting parameters wrong and what not. Combining them and having one agent work all three repos with a shared set of documentation made it no longer make mistakes when it needed to make changes across multiple projects.