OS/2 vendor ID invalid

Definition

Vendor ID is more than 4 characters or contains non-ASCII. The OS/2 achVendID field is 4 bytes — Microsoft's registry uses 4-letter all-caps tags. Short tags will be space-padded; over-length tags get truncated.

How Patens surfaces this

The Patens audit module checks for meta-vendor-id-invalid across five teaching surfaces: the edit-panel inline issue list, the project-wide audit page, the release pre-flight check, the family hub, and the home-page project tile. Every surface shows the same plain-English explanation and links back to this page. This rule is detection-only — there's no automatic fix because the correction is design-dependent (it requires a judgment call about the glyph's intended shape or the font's intended behaviour). The audit message links to the specific glyph or field that needs attention.

Run this check yourself

Patens runs every audit rule live as you draw — including this one. The editor (in private alpha) shows meta-vendor-id-invalid firing on real glyphs, or check your own work from the CLI:

npx patens audit your-project.font.json

Related rules in Metadata

• meta-no-copyright Copyright notice empty
• meta-no-designer Designer field empty
• meta-no-designer-url Designer URL empty
• meta-no-license License field empty
• meta-no-license-url License URL empty
• meta-no-manufacturer Manufacturer field empty
• meta-no-vendor-id OS/2 vendor ID empty
• meta-version-format Version string format invalid