Because Claude code does offer particular features. More important than “features” is the fact that it works and does the things you want like 60-70% of the time, with guardrails and practice and attention. Which is way better than competing tools.

Besides that. These tools are changing so fast that to build an agent agnostic tool would be insane given the speed and market pressures right now. Why support roo or cline or cursor cli if it adds 3x engineering cost for 20% more market reach? The reality is there are no standards around the way the actual leading tools work if you wanna build something on Claude/codex/(insert flavor of the week).

Gotta pick your horse and try to hang on, and hope you picked right.