You're not wrong. I did a similar agent in lisp back with Sonnet 3.5 and had a wow moment, but the wow was mostly for seeing an agent working effectively at all at that point in time.

The part that killed it for me was losing everything if the lisp crashed (sonnet 3.5 was prone to doing that) and solving persistence had too many edge cases and confused the model.

Later realized that writing the agent as 20 lines of bash was equivalently powerful to the lisp agent, but made persistence trivial from the easy file system interop.