But it write mostly useless documentation Which take time to read and decipher.

And worse, if you are using it for public documentation, sometimes it hallucinate endpoints (i don't want to say too much here, but it happened recently to a quite used B2B SaaS).

Loop it. Use another agent (from a different company helps) to review the code and documentation and call out any inconsistencies.

I run a bunch of jobs weekly to review docs for inconsistencies and write a plan to fix. It still needs humans in the loop if the agents don’t converge after a few turns, but it’s largely automatic (I baby sat it for a few months validating each change).