pyproject.toml Release Gate (PEP 639): 19 date-aware checks on the [project] metadata that decides whether your next release uploads

Dated developer deadlines — the line that stops working, and the date.

Who it’s for
Developers who own CI, build and release files with a vendor shutdown date coming.

What breaks, and when
Shutdown dates do not warn you inside the repo: GitHub removed the ubuntu-20.04 runner on 2025-04-15, and a build still on a removed runtime, action or SDK fails on the day it is switched off.

What you get
• 100 ReadyStack linters on this shelf (VS Code Marketplace and Open VSX), plus any added later
• Your key unlocks the whole-workspace sweep and the dated report in each
• Rule updates pulled from ReadyStack without a reinstall
• The single-file check stays free without a key

FAQ
Q: How is this different from asking ChatGPT?
A: Each check reads your own file against a rule file that names the provision and its start date; the report records the run date, check version and file fingerprints. A chat answer has none of that and may describe last year’s rule.

Billed $79 a year. All linters on the shelf: https://getreadystack.com/collections/developer-deadlines

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