It's a half-baked, rushed out, speculative attempt to capture developer mindshare and establish an ecosystem/moat early in a (perceived) market. It's a desperate "standard" muscled in by Amazon/Claude, similar to their overwrought "Smithy" IDL that basically nobody outside the Amazon SDK team chooses to use for API/Schema management. It will end up in that same niche in the long term, most likely... AWS/Amazon/Claude specific app integrations, buried underneath some other 3rd party framework that abstracts it away and makes the "spec" irrelevant.