Custom emoji icons are validated
By Steven Van ·
Notion's API now rejects custom_emoji icons that don't match a real custom emoji in the workspace, instead of saving one that reads back as null.
Notion's API now validates custom_emoji icons on pages, databases, data sources, and callouts. The id passed in must match a custom emoji that exists in the integration's workspace; if it doesn't, the request returns a validation_error instead of silently saving an icon that reads back as null. The same check now applies in Notion MCP, where notion-create-pages and notion-update-page validate custom_emoji page icons the same way. Full details are in the emoji and icon reference. See Notion
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