Customize Virtualenv Prompt

[jplindquist]

I've been combing through docs and code for a while now, and see that it is possible to customize the virtualenv prompt by setting virtualenvs.prompt, an I would like it to be as simple/short as possible for my case (just using {project_name}), but when attempting to do so, the virtualenv prompt is consistently set to the full path of the project. Is this something I'm doing wrong, or is there a way to do this? I don't know if it matters, but in this case I'm just using poetry for dependency manage (package-mode = false).

❯ poetry config --list
cache-dir = "/Users/jlindquist/Library/Caches/pypoetry"
data-dir = "/Users/jlindquist/Library/Application Support/pypoetry"
installer.max-workers = null
installer.no-binary = null
installer.only-binary = null
installer.parallel = true
installer.re-resolve = true
keyring.enabled = true
python.installation-dir = "{data-dir}/python"  # /Users/jlindquist/Library/Application Support/pypoetry/python
requests.max-retries = 0
solver.lazy-wheel = true
system-git-client = false
virtualenvs.create = true
virtualenvs.in-project = true
virtualenvs.options.always-copy = false
virtualenvs.options.no-pip = false
virtualenvs.options.system-site-packages = false
virtualenvs.path = "{cache-dir}/virtualenvs"  # /Users/jlindquist/Library/Caches/pypoetry/virtualenvs
virtualenvs.prompt = "{project_name}"

After running poetry install I end up with the following venv.cfg that has prompt set to a full path vs. what is specified

cat .venv/pyvenv.cfg
home = /Users/jlindquist/mise/installs/python/3.13.3/bin
implementation = CPython
version_info = 3.13.3.final.0
virtualenv = 20.30.0
include-system-site-packages = false
base-prefix = /Users/jlindquist/mise/installs/python/3.13.3
base-exec-prefix = /Users/jlindquist/mise/installs/python/3.13.3
base-executable = /Users/jlindquist/mise/installs/python/3.13.3/bin/python3.13
prompt = /Users/jlindquist/dev/site24x7client/site24x7client

If I leave the default, or set the prompt to {project_name} + anything else, it works as expected, e.g.

poetry config virtualenvs.prompt
{project_name}-custom

❯ cat .venv/pyvenv.cfg
home = /Users/jlindquist/mise/installs/python/3.13.3/bin
implementation = CPython
version_info = 3.13.3.final.0
virtualenv = 20.30.0
include-system-site-packages = false
base-prefix = /Users/jlindquist/mise/installs/python/3.13.3
base-exec-prefix = /Users/jlindquist/mise/installs/python/3.13.3
base-executable = /Users/jlindquist/mise/installs/python/3.13.3/bin/python3.13
prompt = site24x7client-custom