feat(cli): add self-hosted LangGraph and Vercel AI SDK backends - #968
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Add the two backend overlays for the self-hosted template, selected with `--backend-framework`. - LangGraph: a standalone Agent Server in `src/agent/agent.ts` described by `langgraph.json`, with `/api/chat` acting as a browser-to-server proxy via `@openuidev/langchain`. `pnpm dev` runs the Agent Server and Next.js together; deploy the frontend to Vercel and point `LANGGRAPH_API_URL` at the Agent Server. - Vercel AI SDK: a `streamText()` route returning `toUIMessageStreamResponse()`, consumed by `vercelAIAdapter()`. The whole project deploys to Vercel as one Next.js app. - Both overlays drop the `openai` dependency, since the framework owns the provider client. - Add a shared `get_weather` example tool backed by Open-Meteo (no API key) so the selected framework's native multi-step tool loop is testable right after scaffolding. 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 self-hosted template.
Changes
src/agent/agent.tsdescribed bylanggraph.json, with/api/chatproxying to it through@openuidev/langchain.pnpm devruns the Agent Server and Next.js together.streamText()route returningtoUIMessageStreamResponse(), consumed byvercelAIAdapter(). The whole project deploys to Vercel as one Next.js app.openaidependency, since the framework owns the provider client.get_weatherexample backed by Open-Meteo (no API key), so the selected framework's multi-step tool loop is testable right after scaffolding.Warning
This touches
packages/openui-cli/src/templates/, which #953 deletes in favour of theopenui-templatesrepo. Whichever stack lands second needs this redone over there.Test Plan
Built the CLI and scaffolded both variants. Confirmed the route and page land, framework dependencies merge,
openaiis dropped,langgraph.jsonandsrc/agent/agent.tsship for the LangGraph variant, andbackends/never leaks into the generated project.Checklist