This handles Salesforce custom tab creation across objects, web content, and Visualforce pages. The real value here is the strict element allowlist and deployment error prevention. The spec is unusually explicit about what breaks deployments, like adding a label to object tabs or using forbidden elements like sobjectName or tabVisibility. It includes working templates you can actually copy for each tab type and emphasizes picking unique motifs instead of defaulting every tab to the same icon. If you've hit cryptic deployment failures when creating tabs, this documents exactly which elements are allowed and which will error out.
npx skills add https://github.com/forcedotcom/afv-library --skill generating-custom-tab