Prompt Composer

The full input: attach files, pick a model, slash commands and @mentions.

PROGet Prompt Composer and 168 other Pro components with pro lifetime — Get Pro

Category
AI Chat
Access
Pro
Source
588 lines · one file
States
7 drawn

The decision inside it

A refused file says why, and the rest still go through

Too large, the wrong type, one too many: each is named beside the file it applies to. Dropping five files where one is over the limit attaches four and explains the fifth.

When to use it

Use Prompt Composer when the prompt box needs more than text: attachments (button, drop or paste), a model menu, / commands and @ mentions. For a plain box with Send and Stop, use Prompt Input.

Installation

How you get it

Paste this into Claude Code, Cursor, Codex or any coding agent. It installs the file and uses it as it is, instead of writing a new one.

Use Liro's Prompt Composer for this.
Install it: npx shadcn@latest add @liro/prompt-composer
(the @liro registry is set up in components.json, with LIRO_KEY in .env.local)
Import it from @/components/ui/prompt-composer.
Do not rewrite or restyle it. Pass my data through its props
and keep its built-in states.

For the full brief with every prop and the mistakes assistants usually make, use Copy prompt above. Pro components install through the @liro registry with your CLI token: see the Namespaced tab.

Usage

components/composer.tsx
import { PromptComposer, type ComposerMessage } from "@/components/ui/prompt-composer";

export function Composer({ onSend, busy, onStop }: { onSend: (m: ComposerMessage) => void; busy: boolean; onStop: () => void }) {
  return (
    <PromptComposer
      onSubmit={onSend}
      status={busy ? "streaming" : "idle"}
      onStop={onStop}
      models={[
        { id: "fast", name: "Fast", description: "Quick answers" },
        { id: "best", name: "Best", description: "Slower, more careful" },
      ]}
      defaultModel="fast"
      commands={[{ id: "summarise", label: "Summarise", insert: "Summarise this document: " }]}
      mentions={[{ id: "inv", label: "Invoices" }]}
      placeholder="Ask anything, / for commands, @ to mention"
    />
  );
}

API reference

“Copy prompt” above puts a full brief on your clipboard, install command, dependencies, props, and the mistakes an assistant usually makes with this component.

Props

Read from the component’s own TypeScript interface when the site is built, so this table cannot drift from the file you install.

TypeNotes
onSubmit(message: ComposerMessage) => void No–
attachboolean NoShow the attach button and accept dropped and pasted files. Default true.
defaultAttachmentsComposerAttachment[] No–
onAttachmentsChange(attachments: ComposerAttachment[]) => void No–
acceptstring NoAs for a file input: ".pdf,.csv,image/*".
maxFilesnumber NoDefault 5.
maxFileSizenumber NoBytes. Default 10 MB.
modelsComposerModel[] No–
modelstring No–
defaultModelstring No–
onModelChange(id: string) => void No–
commandsComposerCommand[] NoOpened by typing "/".
mentionsComposerMention[] NoOpened by typing "@".
togglesComposerToggle[] No–
defaultTogglesstring[] No–
onTogglesChange(ids: string[]) => void No–

Dependencies

npm packages

clsxframer-motionlucide-reacttailwind-merge

Liro foundations, installed alongside it

liro-themebuttondropdown-menuprompt-input

States

All of them are drawn by the component. None is left for you to design.

  • Empty
  • With files
  • File refused
  • Dragging over
  • Command list
  • Mention list
  • Streaming

Accessibility

  • Keyboard reachable throughout, in visual order
  • Focus trapped in overlays, Escape closes them
  • Focus returns to whatever opened it
  • Live regions announce what changed, not that something did
  • Honours prefers-reduced-motion

Responsive behavior

  • Sizes to its container, not the viewport
  • Usable from 320px up
  • Pointer-based interaction, so trackpad and touch both work
  • No hover-only affordances

Used in a screenAll screens

ScreenPro

Assistant Home

The start page of an AI assistant: a greeting, the prompt box, connected apps and suggestions from them.