feat(cli): add OpenUI Cloud LangGraph and Vercel AI SDK backends - #969
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Add the two backend overlays for the Cloud template. In both, the framework owns orchestration and application tools while OpenUI Cloud is attached as the Responses model provider and conversation store; reports, presentations, web search, image search, and MCP stay provider-executed. - LangGraph: `src/agent/agent.ts` builds the agent with `createAgent()` and a middleware that points the model at Cloud, forwards only the newest message (Cloud holds the history), and strips Cloud-owned tool calls from graph state so ToolNode runs only app tools. `/api/chat` proxies to the Agent Server via `@openuidev/langchain`. - Vercel AI SDK: a `streamText()` route with middleware that marks Cloud-executed tools as provider-executed so the SDK streams them without dispatching them locally, and a UI-chunk transform that makes completed Cloud tools display-only in the browser. - Each overlay ships its own `cloud-chat.tsx` wired to the transport its route speaks — `agUIAdapter()` for LangGraph, `vercelAIAdapter()` plus `vercelAIMessageFormat` for the AI SDK. The base template keeps its `openAIResponsesAdapter` version untouched, so there is no transport map or `backend` prop to keep in sync as backends are added. - Ignore `.langgraph_api`, written by the local Agent Server. Migrated from PR #785 (visharad/th-2051-route-replacement). Co-Authored-By: Visharad Kashyap <154831195+vishxrad@users.noreply.github.com>
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What
Adds the LangGraph and Vercel AI SDK backend overlays for the Cloud template. In both, the framework owns orchestration and application tools while OpenUI Cloud stays the Responses model provider and conversation store — reports, presentations, web search, image search and MCP remain provider-executed.
Changes
src/agent/agent.tsbuilds the agent withcreateAgent()plus a middleware that points the model at Cloud, forwards only the newest message (Cloud holds the history), and strips Cloud-owned tool calls from graph state so ToolNode runs only app tools.streamText()route with middleware that marks Cloud-executed tools as provider-executed, so the SDK streams them without dispatching them locally, plus a UI-chunk transform that makes completed Cloud tools display-only in the browser.cloud-chat.tsxwired to the transport its route speaks —agUIAdapter()for LangGraph,vercelAIAdapter()+vercelAIMessageFormatfor the AI SDK. The base template is untouched, so there's no transport map orbackendprop to keep in sync as backends are added..langgraph_api, written by the local Agent Server.Pure additions — this PR modifies no existing template file.
Test Plan
Built the CLI and scaffolded all three Cloud variants. Each gets the right adapter in its generated
cloud-chat.tsx—agUIAdapter,vercelAIAdapter, andopenAIResponsesAdapterfordefault— with nobackendprop and no transport map anywhere. Also confirmedsrc/lib/tool-loop.tsis removed viafiles.removeandbackends/doesn't leak.Checklist