Based on my personal experience, sometimes even if the API is yours, making changes can be difficult. The example I first think of is my last company. We had a

Based on my personal experience, sometimes even if the API is yours, making changes can be difficult. The example I first think of is my last company. We had a backend and frontend team, both working on the same product but the two teams disagreed a lot and would take weeks to make a small change even if it wasn't a breaking change. To add to it all, there wasn't a standard to deprecating APIs so even a simple key rename could cause everything to blow up. Things weren't fun so I can see the need for these kinds of tools.