I felt that, too. It turns out I was getting 'too comfortable' while using CC. The best way is to treat CC like a junior engineer and overexplain things before letting it do anything. With time, you start to trust CC, but you shouldn't do that because it is still the same LLM when you started.

Another thing is that before, you were in a greenfield project, so Claude didn't need any context to do new things. Now, your codebase is larger, so you need to point out to Claude where it should find more information. You need to spoon-feed the relevant files with "@" where you want it to look up things and make changes.

If you feel Claude is lazy, force it to use more thinking budget "think" < "think hard" < "think harder" < "ultrathink.". Sometimes I like to throw "ultrathink" and do something else while it codes. [1]

[1]: https://www.anthropic.com/engineering/claude-code-best-pract...