# NVIDIA's NOOA framework

By Saurabh Kumar · TIL note, Jul 28, 2026 · Tags: python, harness

Source: https://saurabh-kumar.com/til/1785240000/

Python's `Ellipsis` literal (`...`) is a real object (`type(...)` is `<class 'ellipsis'>`), not just a placeholder. Beyond type stubs and numpy slicing, [NVIDIA's NOOA framework](https://github.com/NVIDIA-NeMo/labs-OO-Agents) repurposes it as a runtime dispatch marker: methods with `...` bodies are completed by an LLM at runtime, while methods with real bodies stay deterministic Python. The boundary between "code I control" and "code the model controls" becomes greppable: `grep -n '\.\.\.' agent.py`. Clever reuse of existing syntax that linters and type checkers already accept.