Production publisher rejects standard GM.* grants such as GM.addStyle

[Makaytron]

Production behavior

OpenUserJS username: makaytron
Date: 2026-08-04

Publishing a current userscript through New Script -> Write Script Online -> Submit Code returns HTTP 400:

`@grant` with value of `GM.addStyle` is not valid or supported.

Public source used for the reproduction:
https://raw.githubusercontent.com/Makaytron/Etsy-Automation-Tools/main/scripts/etsy-message-assistant/Makaytron-Etsy-Message-Assistant.user.js

A separate source using @grant GM_info was also rejected. I understand the rationale in #2101 that GM_info should not need an explicit grant, but removing that one line does not resolve the broader problem: the production validator also rejects standard modern GM.* grant names such as GM.addStyle.

Expected behavior

Modern GM.* functions should be accepted in @grant. Tampermonkey's current documentation explicitly says @grant whitelists both GM_* and GM.* functions:
https://www.tampermonkey.net/documentation.php?locale=en&q=grant

Violentmonkey also documents GM.addStyle as a supported Greasemonkey 4-compatible alias:
https://violentmonkey.github.io/api/gm/#gm-addstyle

Impact

The exact public scripts are live on GitHub and Greasy Fork, but cannot be published on OpenUserJS without changing functional metadata or maintaining an OpenUserJS-specific fork. GitHub repository:
https://github.com/Makaytron/Etsy-Automation-Tools

Could the production metadata validator accept documented GM.* grant names, or provide the supported compatibility mapping?