Chat & AI

Reasoning

Collapsible thinking block that follows streaming.

Import

tsx

import { Reasoning } from "@cronus-ui/ui";

bash

npx cronus-ui add reasoning

Examples

Thinking

Opens while streaming, then can collapse once the thought is done.

The user wants a product UI system, not a bag of parts.

tsx

<Reasoning defaultOpen duration={4}>
  <ReasoningTrigger />
  <ReasoningContent>
    The user wants a product UI system, not a bag of parts.
  </ReasoningContent>
</Reasoning>

.cronus

The same component declared in Cronus. Emitted at build time from the audit fixtures — the kernel renders it as HTML with no React.

PortedParity: MatchGeometry 1/1Pixel diff 0 pxLogic 1/1Parity scoreboard

default.cronus

app "audit-fixtures" {
  port 5176
}

style {
  preset aurora
  theme dark
}

component ReasoningDefault layout:inline style:reasoning {
  duration:3
  label "The user wants a summary, so list the three biggest changes first."
}

page "/audit/reasoning/default" type:custom {
  use ReasoningDefault
}

API Reference

Generated from the component's exported types.

ReasoningLabels

Prop	Type	Default	Description
`thinking`*	`string`	—	—
`thoughtForFew`*	`string`	—	—
`thoughtFor`*	`string`	—	Use `{duration}` as the seconds placeholder.

ReasoningProps

Extends ComponentProps<typeof Collapsible>

Prop	Type	Default	Description
`isStreaming`	`boolean`	`false`	—
`open`	`boolean`	—	Controlled open state.
`defaultOpen`	`boolean`	`true`	Uncontrolled initial open state.
`onOpenChange`	`(open: boolean) => void`	—	Called when the open state changes.
`duration`	`number`	—	—
`labels`	`Partial<ReasoningLabels>`	—	Override default English strings.
`children`	`ReactNode`	—	Contents of the component.
`disabled`	`boolean`	—	Disables pointer and keyboard interaction.

ReasoningTriggerProps

Extends ComponentProps<typeof CollapsibleTrigger>

Prop	Type	Default	Description
`asChild`	`boolean`	—	Render as the child element via Slot.
`children`	`ReactNode`	—	Contents of the component.
`className`	`string`	—	Additional class names merged onto the root.

ReasoningContentProps

Extends ComponentProps<typeof CollapsibleContent>

Prop	Type	Default	Description
`forceMount`	`boolean`	—	Keep the node mounted when closed, for exit animation.
`asChild`	`boolean`	—	Render as the child element via Slot.
`children`	`ReactNode`	—	Contents of the component.
`className`	`string`	—	Additional class names merged onto the root.