Plugins
Lettern's own features — the admin included — are modules and plugins built with the same API you get. Anything they do, yours can do.
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The admin's screens are modules inside letterncms/cms; the builder, the static site, SEO, media, forms, email, MCP and the assistant are plugins, each a Composer package and a repository of its own. Both are the same kind of package, none uses a private API, and each can be switched off or replaced. That is the best documentation there is — read their code next to these pages.
- Modules — what the admin is made of, switching parts off, their settings and what each costs
- How plugins work — packages, providers, lifecycle, blocks, data sources, collections
- Your first plugin — a complete, working example
- Hooks — every action and filter
- Admin extensions — screens, panels, block workspaces, fields, commands
- Settings — configuration screens for free