> The reason that people don't understand why Anthropic wont let the subscription be used with other harnesses

Even more specifically, the very fact that people would prefer, if they had the option, to use other harnesses with roughly equivalent feature sets strongly implies that the harness is not bringing them any value they couldn't get from a bunch of other places, including open-source equivalents.

Anthropic might want you to use their harness for their own reasons (control over caching, logging your interactions for training data, et cetera), but the idea that the Claude Code harness itself is bringing significant value which would help to lock users into the Anthropic ecosystem more than the Claude models alone do is kind of laughable. So _of course_ it seems like a baffling and arbitrary restriction to many users.