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Form Mention Input

Comment box where typing @ opens a list of people to mention.

Full screen Try a theme

Choose the primitives library your project already uses. Both look the same: your theme, not the variant, controls colors, shape, type and motion.

About this block

What it's for

  • Comment box where typing @ opens a list of people to mention.
  • Textarea with @ and # triggers for users and topics with autocomplete.
  • Mention input that stores a serialized value with user ids.

For the field only collects a list of values, use Form Tag Input.

Includes

  • At mention
  • Hash topic
  • Multi trigger
  • Autocomplete listbox
  • Token chips
  • Token range tracking
  • Serialized value
  • Keyboard navigation

Works with

  • Radix UI and Base UI primitives (pick the one your project uses)
  • React 19 and Tailwind CSS 4 in Next.js (App Router), Vite, React Router or TanStack Start, installed with the agentic-ui or shadcn CLI
  • Your theme tokens, in light and dark mode

Install

Included with Agentic UI Kit (one-time license). Install needs your license key: see pricing · connect your project.

Agentic UI CLI
agentic-ui add form-mention-input
Installs through shadcn and adapts the component to your design tokens.
shadcn CLI
npx shadcn@4.17.0 add @agentic-ui/form-mention-input

Used in

A standalone component: drop it into any screen.

Type
Block
Variants
Radix UI and Base UI
Themes
Light and dark
Widths
Preview it at desktop, tablet and mobile widths above.