Which agent is used only as part of a login script?

In the context of network access control systems like FortiNAC, a dissolvable agent is typically a piece of software that is executed on the endpoint as part of a login script or when a user accesses a captive portal. It runs once to gather information or enforce policies and then removes itself from the system, hence the term "dissolvable."

References

FortiNAC documentation on agent deployment and types of agents.