Is an Appointment Letter Necessary with a 2-Year Surety Bond for New Hires? Seeking Legal Insights

Dear all respected seniors,

We are creating a service agreement/surety bond with newly hired employees for a limited period, such as 2 years or more. Now, my query is, is issuing an appointment letter to employees necessary along with creating an indemnity/surety bond with employees for 2 years or more? What are the legal aspects of this? I am seeking your valuable inputs.

Thanks

In my opinion, while hiring a person on probation, making an agreement for continuous work for two years after probation can be legally challenged and not maintainable. The same is a one-sided agreement.