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AI Chat13
  • Copilot Shell
  • Docked Assistant
  • Prompt Starter Welcome
  • Quote Reply Sidebar
  • Connected Apps Chat
  • Agentic Task Panel
  • Model Comparison
  • Voice Assistant Panel
  • Branching Thread
  • Structured Answers
  • Answer Receipts
  • Docs Support Assistant
  • Corner Chat Popup
Agent Activity5
AI UsageNew AI Usage category with 2 spend blocks2

For AI Agents

Hand your agent this brief or the ReUI MCP, not a screenshot. Installs with a ReUI Pro or Ultimate license.

Best for: A thread held as a node tree, where a regenerate or an edit adds a version chip on its fork, with folded reasoning and numbered citations

When to use

  • A full page assistant chat, new chat welcome screen or 2 model comparison inside an AI product
  • A copilot docked beside the page it works on, or opened from a launcher in the page corner
  • Answers that show the work behind them: sources read, tool steps, plans to approve and run cost

When not to use

  • A draft written straight into the document open beside the thread, with an Undo: use the Docked Assistant block
  • A greeting screen whose start rows attach a source, with an Instant to Deep effort picker: use the Prompt Starter Welcome block
  • The product layout around the chat: a sidebar of threads, workspaces and account menus: use the App Shell blocks
  • A plain overlay chat panel opened from a button, with suggestion chips and a composer: use the Sheet blocks
  • A highlighted snippet with a filename header and copy button, outside any conversation: use the Code Block component

Agent notes

  • Replace THREAD_TREES and THREADS; each ChatNodeRecord lists its children, and DEFAULT_SELECTION picks the version a fork opens on
  • composeReply matches the prompt against REPLY_LIBRARY and stepsFor against ACTIVITY_PLANS; return your model's parts, sources and steps there
  • Nothing persists: ratings set local votes and a toast, versions and the star live in trees and favorites state, and Copy link uses THREAD_URL
  • Each AiChat root sizes itself to the viewport with h-svh, or min-h-svh in ai-chat-5; give it your layout's height inside an app shell
  • Every reply is canned content from the block's data file, played back on setTimeout and setInterval timers; stream your model's output there instead

Third-party API docs

  • Sonner v2: API reference, docs
  • Shiki v4: API reference, docs, through ReUI Code Block
Markdownhttps://reui.io/blocks/ai-agents/ai-chat/ai-chat-9.md
MCPget_block("ai-chat-9")
Installnpx shadcn@latest add @reui/ai-chat-9
Full index for agents:llms.txtReUI MCP setup

Shadcn Components in the Branching Thread Block

  • Attachment
  • BadgeReUI
  • Bubble
  • Button
  • Code BlockReUI
  • Collapsible
  • Dropdown Menu
  • Empty
  • Field
  • Icon StackReUI
  • Input Group
  • Kbd
  • Marker
  • Message
  • Message Scroller
  • Popover
  • Spinner
  • Tabs
  • Tooltip

Dependencies

  • cn
  • sonner

Shadcn Branching Thread Block

Branching AI chat thread with reply versions, cited sources and code artifacts. Part of the ReUI Shadcn AI & Agents AI Chat blocks collection.

A standalone conversation under one minimal header: a tabbed thread switcher over pinned and recency lists, a favorite toggle and a fold for earlier turns, above replies that arrive as small documents with sections, bullets and code artifacts in markdown, yaml, json, typescript and sql, each one folding its working away behind a thought row and listing the sources its inline citations point back to, over a thread held as a tree so a regenerate or an edit adds a version on the fork rail instead of overwriting the turn.

It is composed from Attachment, Badge, Bubble, Button, Code Block, Collapsible, Dropdown Menu, Empty, and more, so every part of it is a primitive you can restyle with your own design tokens.

What You Can Build With the Branching Thread Block

  • Install it with the ReUI registry command in the toolbar above, then swap the placeholder content, data wiring, and business logic for your own.
  • Compare it across all eight ReUI styles and both the Base UI and Radix bases in the customizer before committing to one direction.
  • Combine it with the other Shadcn AI & Agents AI Chat blocks to assemble a full screen instead of a single section.

All Shadcn AI & Agents AI Chat Blocks

The rest of this category, each on its own page with a live preview, the components it is built from, and the install command.

  • Copilot Shell AI copilot chat surface with streaming transcript and recent chats
  • Docked Assistant Docked AI assistant chat panel beside a page with insert into draft
  • Prompt Starter Welcome AI chat welcome screen with prompt starters and a docked composer
  • Quote Reply Sidebar Floating right chat sidebar that pushes the page and replies to a quoted sentence
  • Connected Apps Chat AI chat welcome screen where connected work apps set the answer scope
  • Agentic Task Panel Agentic side panel where the answers carry the controls
  • Model Comparison Split pane model comparison running one prompt against two AI models
  • Voice Assistant Panel Docked voice first assistant panel that answers in a different shape each time
  • Structured Answers AI chat welcome screen with scoped sources and structured answers
  • Answer Receipts AI chat stage with framed answer receipts on a live dot field
  • Docs Support Assistant Ask AI docs support panel that shows the knowledge base being read
  • Corner Chat Popup Corner AI chat popup with history, expand and page context

Related Shadcn AI & Agents Block Categories

  • Agent Activity (5) Agent run views, from live step feeds and approvals to research traces, MCP call tables, and run reports.
  • AI Usage (2) Spend planning and month to date spend views for AI product workspaces, by token volume, model, budget and caps.

All Shadcn Block Groups

Browse the full ReUI Shadcn blocks library by product surface. Each group bundles category-level blocks you can mix and match across your project.

  • Shadcn Application Blocks (303) Browse 303 Shadcn Application blocks across 23 categories.
  • Shadcn Data Grid Blocks (44) Browse 44 Shadcn Data Grid blocks across 9 categories.
  • Shadcn Charts Blocks (51) Browse 51 Shadcn Charts blocks across 10 categories.
  • Shadcn Solutions Blocks (76) Browse 76 Shadcn Solutions blocks across 11 categories.
  • Shadcn AI & Agents Blocks (20) Browse 20 Shadcn AI & Agents blocks across 3 categories.
  • Shadcn eCommerce Blocks (87) Browse 87 Shadcn eCommerce blocks across 13 categories.
  • Shadcn Marketing Blocks (67) Browse 67 Shadcn Marketing blocks across 8 categories.

Frequently Asked Questions

When should I use the Branching Thread block?

Use it for a thread held as a node tree, where a regenerate or an edit adds a version chip on its fork, with folded reasoning and numbered citations.

The AI Chat category fits:

  • A full page assistant chat, new chat welcome screen or 2 model comparison inside an AI product
  • A copilot docked beside the page it works on, or opened from a launcher in the page corner
  • Answers that show the work behind them: sources read, tool steps, plans to approve and run cost

For a draft written straight into the document open beside the thread, with an Undo, use the Docked Assistant block. For a greeting screen whose start rows attach a source, with an Instant to Deep effort picker, use the Prompt Starter Welcome block. For the product layout around the chat: a sidebar of threads, workspaces and account menus, use the App Shell blocks. For a plain overlay chat panel opened from a button, with suggestion chips and a composer, use the Sheet blocks. For a highlighted snippet with a filename header and copy button, outside any conversation, use the Code Block component.

What is the Branching Thread block built with?

Branching Thread uses Attachment, Badge, Bubble, Button, Code Block, Collapsible, Dropdown Menu, Empty, Field, Icon Stack, Input Group, Kbd, Marker, Message, Message Scroller, Popover, Spinner, Tabs, Tooltip. Installing the block through the ReUI registry pulls those dependencies in for you.

Can I restyle the Branching Thread block?

Yes. It reads your design tokens, so switching style, radius, base color, font, or icon library in the customizer restyles it without touching the markup.

How should I use Shadcn ai chat blocks in a real project?

Treat them as structured starting points. Keep the layout, hierarchy, and interaction ideas that work, then replace placeholder content, data wiring, and business logic with your own product requirements.
PreviousVoice Assistant PanelNextStructured Answers

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Shadcn Branching Thread

A standalone conversation under one minimal header: a tabbed thread switcher over pinned and recency lists, a favorite toggle and a fold for earlier turns, above replies that arrive as small documents with sections, bullets and code artifacts in markdown, yaml, json, typescript and sql, each one folding its working away behind a thought row and listing the sources its inline citations point back to, over a thread held as a tree so a regenerate or an edit adds a version on the fork rail instead of overwriting the turn.