# Overflow Tabs

> Priority+ tabs for app headers: tabs that don't fit fold, in order, into a More menu, and picking one there promotes it into the strip under a sliding highlight. Measures live with a ResizeObserver, so it reflows as the container resizes.

- Slug: `overflow-tabs`
- Category: [Tabs](https://www.assembli.design/category/tabs.md)
- Type: component
- Tags: tabs, overflow, priority-plus, more-menu, responsive, header
- npm dependencies: @base-ui/react, lucide-react
- shadcn/ui dependencies: none
- Added: 2026-10-22
- Live preview: https://www.assembli.design/preview/overflow-tabs
- Page: https://www.assembli.design/components/overflow-tabs

## Install

One-time setup (needs a subscription):

1. Add the registry to the project's `components.json`: `{"@assembli":{"url":"https://www.assembli.design/r/{name}.json","headers":{"Authorization":"Bearer ${ASSEMBLI_API_KEY}"}}}` (merge into `"registries"`).
2. Put an API key from https://www.assembli.design/account in `.env.local` as `ASSEMBLI_API_KEY=asm_…`.

Then install with the shadcn CLI (writes `components/overflow-tabs/overflow-tabs.tsx` and installs dependencies):

```bash
npx shadcn@latest add @assembli/overflow-tabs
```

Registry item JSON: https://www.assembli.design/r/overflow-tabs.json (send `Authorization: Bearer <api key>`)

## Code

> Component source needs an Assembli subscription ($12/month) and an API key sent as `Authorization: Bearer <key>`. To get one without copying anything, POST https://www.assembli.design/api/agent/login (or call the MCP tool connect_account), show the user the link it returns, and poll https://www.assembli.design/api/agent/token for the key. Or subscribe at https://www.assembli.design/pricing and create a key at https://www.assembli.design/account.