feat(appkit): agent chat UI primitives#366
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| "vaul": "1.1.2" | ||
| }, | ||
| "peerDependencies": { | ||
| "@ai-sdk/react": "~4.0.0-beta", |
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note: we're importing canary channel since 4.0+ allows for customizing messages transport easily, should be published as stable very soon
Signed-off-by: Hubert Zub <hubert.zub@databricks.com>
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Agent chat UI primitives
Adds a small set of headless React building blocks for chatting with an AppKit
agents()server, and rewires the dev playground's agent route to use them.What's new
A new
@databricks/appkit-ui/react/chatsubpath exporting:<Conversation>— render-prop component that runs the whole chat (streaming, history, scroll-stick).<ChatInput>— render-prop input that handles Enter / Shift+Enter / IME / streaming-state.useChatanduseScrollToBottom— the underlying hooks for custom layouts.ResponsesApiTransport— the bit that talks to the agents plugin.The smallest working chat is now ~30 lines of JSX, and threads, tool calls, reasoning ("thinking…"), and destructive-tool approval prompts all stream through without any server-side glue.
Docs at
docs/docs/api/appkit-ui/chat/index.md.Why
Until now, anyone building a chat UI on top of the
agentsplugin had to hand-roll SSE parsing, message reducers, scroll behavior, thread-id plumbing, etc. — the dev playground's agent route was 500+ lines of exactly that. Now it's the same UI, but built out of reusable parts, and any consumer gets the same thing for free.We're piggy-backing on the Vercel AI SDK (
@ai-sdk/react,ai) for the reducer / state machine — they're declared as optional peer dependencies, so apps that don't use the chat primitives don't pull them in.Demo (playground still works)
Screen.Recording.2026-05-08.at.17.32.23.mov
Another demo (tool approval)
What changed in the playground
apps/dev-playground/client/src/routes/agent.route.tsxwas rewritten to use the new primitives. Behavior is the same (chat bubbles, tool approvals, autocomplete, event-stream debug panel), just driven by the shared components instead of inline SSE handling.Notes for reviewers
responses-api-transport.test.ts) and cover the wire-format translation end-to-end.