ui/vercel.json

@@ -1,5 +1,15 @@
 {
-  "$schema": "https://openapi.vercel.sh/vercel.json",
   "framework": null,
-  "buildCommand": "bun run build"
+  "buildCommand": "bun run build",
+  "outputDirectory": ".output/public",
+  "rewrites": [
+    {
+      "source": "/dashboard/api/:path*",
+      "destination": "https://open-swe-v3-f2834ffc0df05a46a10262a9690e8490.us.langgraph.app/dashboard/api/:path*"
+    },
+    {
+      "source": "/(.*)",
+      "destination": "/_shell.html"
+    }
+  ]
 }

ui/vite.config.ts

@@ -74,44 +74,13 @@ function mockHarnessProxy(): Plugin | null {
   }
 }
 
-// Same-origin proxy for the dashboard API. Vercel reads vercel.json BEFORE the build
-// and never interpolates env into it, and prod promotes by fast-forward (so `dev` and
-// `main` ship a byte-identical vercel.json that cannot encode a per-project backend).
-// So the per-project backend is driven through Nitro instead: this `routeRules` proxy
-// is compiled by Nitro's Vercel preset into a CDN-level rewrite in
-// `.vercel/output/config.json` at build time, reading LANGGRAPH_BACKEND_URL from the
-// per-project Vercel env var. Proxy (not redirect) keeps the osw_session cookie
-// first-party on the Vercel origin. The `**` wildcard maps 1:1 to the destination.
-function backendProxyRouteRules():
-  | Record<string, { proxy: string }>
-  | undefined {
-  const backend = process.env.LANGGRAPH_BACKEND_URL?.replace(/\/$/, "")
-  // Nitro's Vercel preset auto-activates from the VERCEL env var; NITRO_PRESET=vercel
-  // forces it locally. On Vercel the backend is mandatory — fail loudly rather than
-  // ship a build whose API calls 404, which is exactly how the previous approach broke.
-  const onVercel =
-    !!process.env.VERCEL || process.env.NITRO_PRESET === "vercel"
-  if (!backend) {
-    if (onVercel) {
-      throw new Error(
-        "LANGGRAPH_BACKEND_URL is required for Vercel builds (set it per Vercel " +
-          "project: dev project -> dev langgraph URL, prod project -> prod langgraph URL).",
-      )
-    }
-    // Off Vercel with no backend configured (plain local `vite build`, tests): omit the
-    // proxy. Local dev gets its API via the E2E_HARNESS mock proxy above instead.
-    return undefined
-  }
-  return { "/dashboard/api/**": { proxy: `${backend}/dashboard/api/**` } }
-}
-
 const config = defineConfig({
   optimizeDeps: { include: ["workbox-window"] },
   worker: { format: "es" },
   plugins: [
     mockHarnessProxy(),
     devtools(),
-    nitro({ routeRules: backendProxyRouteRules() }),
+    nitro(),
     viteTsConfigPaths({
       projects: ["./tsconfig.json"],
     }),