When should you use a message queue for inter-service communication?

hey everyone, ive been thinking a lot about system design patterns lately, and im a bit unclear on the exact criteria for introducing a message queue. were building a new service that needs to communicate with several existing ones, and the temptation to just use direct http calls is strong. however, i know message queues offer benefits like decoupling and resilience. when have you found them to be truly necessary, as opposed to just a nice to have? what specific problems did they solve for you that direct calls couldnt handle easily