Summary

The uv docs say that:

Settings provided via environment variables take precedence over persistent configuration, and settings provided via the command line take precedence over both.

However, you can easily test that uv run --dev does not override UV_NO_DEV=1. I've created a repo that demonstrates this here: https://github.com/multimeric/UvNoDevBug. In the workflow run, pytest is not available, which indicates that UV_NO_DEV=1 is winning.

Platform

Tested on MacOS 15.6 and Ubuntu 24.04.4

Version

0.11.10, 0.11.11

Python version

3.12