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If you just want an application number, or don't pursue the protection of rights, you can refer to the authorized application documents and write it yourself. If it is an application for a patent for invention, it shall also reply to the examiner's examination opinions, involving the revision of the application documents, the reply of the examination opinions and the time limit for reply. The advantage of an agent is that you know how to write. You can protect your rights to the greatest extent and strive for the stability of the patent right (that is, the patent right will not be invalidated by other stakeholders in the future). I think many domestic applicants are not familiar with these professional issues and do not understand them. It depends on the needs of each applicant. As for the problem of stealing patents, I am an agent myself, and it has not happened at present. Of course, maybe others are well informed. I don't know if I have ever seen such a situation. Agents with agency qualification certificates are all on record. If such problems occur, the qualification certificate will be cancelled. So looking for an agent, looking for a certified formal, not illegal.