Eval

This is a basic code evaluation skill that executes Python code in a sandboxed environment and returns the output. You'd reach for this when Claude needs to run calculations, test logic, or process data that's easier to handle programmatically than through conversation. The implementation is straightforward: it takes code as input, runs it, and gives you back whatever gets printed or returned. One thing to note is that this is really foundational stuff. It's less a specialized tool and more a primitive capability that other, more complex skills probably build on top of. If you're debugging why Claude can or can't execute something, this is where that ability comes from.