adhoc_tool has an extra_env_vars field - but I can't see where any global variables would be set that it would add to - or that functionality doesn't exist?

I think there's not a

pants.toml

setting as you observe, but I think the runnable can implicitly set some of its own env vars, and so

extra_env_vars

is augmenting those. Breadcrumbs from my code-exploration: •

tool_runner.extra_env

is those from the runnable https://github.com/pantsbuild/pants/blob/d2a9a46e8caf2293759183d10488aa24d3be364a/src/python/pants/backend/adhoc/adhoc_tool.py#L93-L94 • using a

python_source

as a runnable is an example that sets env vars: https://github.com/pantsbuild/pants/blob/d2a9a46e8caf2293759183d10488aa24d3be364a/src/python/pants/backend/python/goals/run_helper.py#L118-L121

ah ok - thanks!