First, it depends on your status as a civil servant. If the position you are applying for is a fresh graduate, you must go to school to prove that you are a fresh graduate with a registration card and a tripartite agreement (there is no need to open a tripartite agreement, the original agreement is to go to school to prove that you are a fresh graduate). If there is no requirement, there is no need to prove it. Moreover, when civil servants report for duty, the employer does not ask to see the tripartite agreement at all, just bring the registration card, and some units don't even look at the registration card.

Second, it depends on whether the company you are applying for has a minimum service life on the work list at that time. For example, it requires a minimum service life of three years, so you should sign an agreement with the company for a minimum service life of three years when you report to the company. If there was no requirement in the remarks at that time, there was no need to sign it.