Why does my patent agent only write 1 claims every time he modifies the claims?

That's because, if you claim more than 1 items, from the 11th item, you have to make diplomatic representations to the National Bureau of 15 yuan for each item. So, your patent agent wants to save you money. Of course, if you think that the writing is not comprehensive and the scope of protection is small, and you don't care about paying 3,5 more, you can ask the agent to write more items. However, if the scope of protection is too large, the possibility of obtaining authorization will also decrease. The examiner thinks that your rights are beyond the scope, and eventually you have to modify or delete them.