You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
pantheon-toolsets was reported malicious
OSV:MAL-2026-5277 - Malicious code in pantheon-toolsets (PyPI)

pantheon-toolsets

This package was deleted from PyPI around 2026-06-06. Installing fails with:
$ pip3 install pantheon-toolsets ERROR: Could not find a version that satisfies the requirement pantheon-toolsets (from versions: none) ERROR: No matching distribution found for pantheon-toolsets

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You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2026-06-05/ \ pantheon-toolsets
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Or, download files manually

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0.5.0
0.5.2
0.5.3
0.5.4