docs: trpc now optional — prerequisite notes + conditional HTML

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web-next/AGENTS.md

@@ -1,6 +1,6 @@
 # AGENTS.md — apps/web-next
 
-Next.js 15 reference application using App Router. Demonstrates consuming feature packages via tRPC, using `@repo/core-trpc/next` for client setup, and importing UI components from `@repo/core-ui`.
+Next.js 15 reference application using App Router. Demonstrates consuming feature packages via tRPC and importing UI components from `@repo/core-ui`. Both `@repo/core-trpc` and `@repo/core-ui` are optional packages — scaffold them with `pnpm turbo gen core-package trpc` / `ui` if needed.
 
 ## Purpose
 
@@ -24,40 +24,44 @@ pnpm dev --filter @repo/web-next   # Next.js on port 3000
 
 | File | Purpose |
 |---|---|
-| `src/app/layout.tsx` | Root layout — wraps app with `<TrpcProvider>` from `@repo/core-trpc/next` |
+| `src/app/layout.tsx` | Root layout — wraps app with `<Providers>` |
-| `src/app/providers.tsx` | Client component for tRPC + React Query setup |
+| `src/app/providers.tsx` | Client component wrapper (add tRPC/React Query here after scaffolding `@repo/core-trpc`) |
 | `src/app/page.tsx` | Home page — navigation + marketing content |
 | `src/app/blog/[slug]/page.tsx` | Dynamic blog post route |
-| `src/app/api/trpc/[trpc]/route.ts` | tRPC fetch adapter endpoint |
 | `e2e/` | Playwright end-to-end tests |
 
-## tRPC Setup
+## tRPC Setup (optional)
 
-The tRPC endpoint handler (in `src/app/api/trpc/[trpc]/route.ts`):
+`@repo/core-trpc` is not installed by default. After scaffolding with `pnpm turbo gen core-package trpc`:
+
+1. Create `src/app/api/trpc/[trpc]/route.ts`:
 
 ```typescript
 import { fetchRequestHandler } from "@trpc/server/adapters/fetch";
 import { appRouter } from "@repo/core-api";
+import { bindAll } from "../../../../server/bind-production";
 
-const handler = (req: Request) =>
+const handler = async (req: Request) => {
-  fetchRequestHandler({
+  await bindAll();
+  return fetchRequestHandler({
     endpoint: "/api/trpc",
     req,
     router: appRouter,
     createContext: () => ({}),
   });
+};
 
 export { handler as GET, handler as POST };
 ```
 
-The provider (in `src/app/providers.tsx`):
+2. Update `src/app/providers.tsx`:
 
 ```typescript
 "use client";
-import { TrpcProvider } from "@repo/core-trpc/next";
+import { NextTrpcProvider } from "@repo/core-trpc/next";
 
-export function Providers({ children }: React.ReactNode) {
+export function Providers({ children }: { children: React.ReactNode }) {
-  return <TrpcProvider>{children}</TrpcProvider>;
+  return <NextTrpcProvider trpcUrl="/api/trpc">{children}</NextTrpcProvider>;
 }
 ```
 
@@ -66,8 +70,8 @@ export function Providers({ children }: React.ReactNode) {
 | Dependency | Purpose |
 |---|---|
 | `@repo/core-api` | `appRouter` for tRPC endpoint |
-| `@repo/core-trpc/next` | Next.js tRPC client + provider |
+| `@repo/core-trpc/next` | Next.js tRPC client + provider (optional — scaffold first) |
-| `@repo/core-ui` | Design system components |
+| `@repo/core-ui` | Design system components (optional — scaffold first) |
 | `@repo/auth`, `@repo/blog`, etc. | Feature packages (indirectly via core-api) |
 | `next` | Next.js 15 framework |
 | `@trpc/server` | tRPC server (fetch adapter) |
@@ -103,5 +107,5 @@ Run: `pnpm test:e2e` starts the dev server and runs all `.spec.ts` files.
 
 - **Feature packages:** `packages/{auth,blog,media,marketing-pages,navigation}/`
 - **tRPC composition:** `packages/core-api/AGENTS.md`
-- **tRPC client + provider:** `packages/core-trpc/AGENTS.md`
+- **tRPC client + provider (optional):** scaffold `@repo/core-trpc` first, then see `turbo/generators/templates/core-package/trpc/AGENTS.md.hbs`
-- **UI components:** `packages/core-ui/AGENTS.md`
+- **UI components (optional):** scaffold `@repo/core-ui` first, then see `packages/core-ui/AGENTS.md`

apps/web-tanstack/AGENTS.md

@@ -4,7 +4,7 @@ TanStack Start reference application using TanStack Router with file-based routi
 
 ## Purpose
 
-Proof that features are framework-portable. This app consumes the exact same feature packages and tRPC routers as `apps/web-next`, but through TanStack Start's server/client architecture instead of Next.js App Router.
+Proof that features are framework-portable. This app consumes the exact same feature packages as `apps/web-next`, but through TanStack Start's server/client architecture instead of Next.js App Router. Once `@repo/core-trpc` is scaffolded, it can use the same tRPC routers via `TanstackTrpcProvider`.
 
 ## Port: 3002
 
@@ -12,7 +12,7 @@ Proof that features are framework-portable. This app consumes the exact same fea
 pnpm dev --filter @repo/web-tanstack   # http://localhost:3002
 ```
 
-Requires tRPC endpoint (from `apps/web-next` or another backend):
+When `@repo/core-trpc` is installed, this app requires a tRPC endpoint (from `apps/web-next`):
 
 ```bash
 pnpm dev --filter @repo/web-next       # Serves tRPC at http://localhost:3000/api/trpc
@@ -23,7 +23,7 @@ pnpm dev --filter @repo/web-tanstack   # http://localhost:3002
 
 | File | Purpose |
 |---|---|
-| `src/routes/__root.tsx` | Root layout — wraps all routes with `<TrpcProvider>` from `@repo/core-trpc/tanstack` |
+| `src/routes/__root.tsx` | Root layout — wraps all routes with `<Outlet />` (add `<TanstackTrpcProvider>` after scaffolding `@repo/core-trpc`) |
 | `src/routes/index.tsx` | Home page (`/`) |
 | `src/routes/blog/index.tsx` | Blog listing (`/blog`) |
 | `src/routes/blog/$slug.tsx` | Dynamic blog post (`/blog/:slug`) |
@@ -45,30 +45,30 @@ Naming conventions:
 - `index.tsx` — index route for its directory
 - `$paramName.tsx` — dynamic segment
 
-## tRPC Setup
+## tRPC Setup (optional)
 
-The root route wraps with `<TrpcProvider>`:
+`@repo/core-trpc` is not installed by default. After scaffolding with `pnpm turbo gen core-package trpc`:
+
+1. Update `src/routes/__root.tsx`:
 
 ```typescript
-// src/routes/__root.tsx
+import { Outlet, createRootRoute } from "@tanstack/react-router";
-import { TrpcProvider } from "@repo/core-trpc/tanstack";
+import { TanstackTrpcProvider } from "@repo/core-trpc/tanstack";
-import { Outlet } from "@tanstack/react-router";
 
 export const Route = createRootRoute({
   component: () => (
-    <TrpcProvider trpcUrl="http://localhost:3000/api/trpc">
+    <TanstackTrpcProvider trpcUrl="http://localhost:3000/api/trpc">
       <Outlet />
-    </TrpcProvider>
+    </TanstackTrpcProvider>
   ),
 });
 ```
 
 Note: `trpcUrl` must point to a running tRPC endpoint (e.g., from `apps/web-next`).
 
-## Fetching data in routes
+2. Fetch data in routes:
 
 ```typescript
-// src/routes/blog/$slug.tsx
 import { createFileRoute } from "@tanstack/react-router";
 import { useTRPC } from "@repo/core-trpc";
 import { useQuery } from "@tanstack/react-query";
@@ -80,11 +80,7 @@ export const Route = createFileRoute("/blog/$slug")({
 function BlogPostPage() {
   const { slug } = Route.useParams();
   const trpc = useTRPC();
-  
+  const { data, isLoading } = useQuery(trpc.blog.getBySlug.queryOptions({ slug }));
-  const { data, isLoading } = useQuery(
-    trpc.blog.getBySlug.queryOptions({ slug })
-  );
-
   if (isLoading) return <p>Loading...</p>;
   return <article>{data?.title}</article>;
 }
@@ -94,9 +90,9 @@ function BlogPostPage() {
 
 | Dependency | Purpose |
 |---|---|
-| `@repo/core-api` | AppRouter type (via core-trpc) |
+| `@repo/core-api` | AppRouter type |
-| `@repo/core-trpc/tanstack` | TanStack tRPC client + provider |
+| `@repo/core-trpc/tanstack` | TanStack tRPC client + provider (optional — scaffold first) |
-| `@repo/core-ui` | Design system components |
+| `@repo/core-ui` | Design system components (optional — scaffold first) |
 | `@tanstack/react-router` | File-based routing |
 | `@tanstack/react-query` | Data fetching + caching |
 | `react` / `react-dom` | React 19 runtime |
@@ -113,6 +109,6 @@ Parallel to `apps/web-next` e2e: validates that features work across frameworks.
 
 - **Feature packages:** `packages/{auth,blog,media,marketing-pages,navigation}/`
 - **tRPC composition:** `packages/core-api/AGENTS.md`
-- **tRPC client + provider:** `packages/core-trpc/AGENTS.md`
+- **tRPC client + provider (optional):** scaffold `@repo/core-trpc` first, then see `turbo/generators/templates/core-package/trpc/AGENTS.md.hbs`
-- **UI components:** `packages/core-ui/AGENTS.md`
+- **UI components (optional):** scaffold `@repo/core-ui` first, then see `packages/core-ui/AGENTS.md`
 - **Next.js app (serves tRPC):** `apps/web-next/AGENTS.md`

docs/architecture/data-flow-explainer.html

@@ -2801,7 +2801,7 @@ function makeStages(F) {
       meta: `@repo/${F.name}/ui`,
       file: `packages/${F.name}/src/ui/query.ts`,
       tag: "client",
-      prose: `<code>${F.queryName}</code> on the client builds a typed React Query option object. The args type is inferred all the way back from the use case's <code>${F.inputSchemaName}</code>, exported from the feature root.`,
+      prose: `<code>${F.queryName}</code> on the client builds a typed React Query option object. The args type is inferred all the way back from the use case's <code>${F.inputSchemaName}</code>, exported from the feature root. <em>Note: <code>useTRPC()</code> is provided by <code>@repo/core-trpc</code> — an optional package. Scaffold it with <code>pnpm turbo gen core-package trpc</code> if not yet present.</em>`,
       code: F.queryName.startsWith("(") ?
 `// auth procedures are mutations — invoked via useMutation, not useQuery
 const trpc = useTRPC();

packages/auth/AGENTS.md

@@ -154,6 +154,7 @@ tests/
 - Any other feature package (`@repo/blog`, `@repo/media`, etc.)
 - Any app package
 - `@repo/core-api`, `@repo/core-cms`, `@repo/core-trpc`, `@repo/core-ui` directly; only `@repo/core-shared`
+> Note: `@repo/core-trpc` and `@repo/core-ui` are optional packages scaffolded via `pnpm turbo gen core-package trpc` / `ui`. If not present, these constraints still apply to any future installation.
 
 ## Cross-links
 

packages/blog/AGENTS.md

@@ -130,6 +130,7 @@ tests/
 - Any other feature package (`@repo/auth`, `@repo/media`, etc.)
 - Any app package
 - `@repo/core-api`, `@repo/core-cms`, `@repo/core-trpc`, `@repo/core-ui` directly; only `@repo/core-shared`
+> Note: `@repo/core-trpc` and `@repo/core-ui` are optional packages scaffolded via `pnpm turbo gen core-package trpc` / `ui`. If not present, these constraints still apply to any future installation.
 
 ## Cross-links
 

packages/core-cms/AGENTS.md

@@ -24,6 +24,8 @@
 - Any app package
 - `@repo/core-shared`, `@repo/core-api`, `@repo/core-trpc`, `@repo/core-ui`
 
+> Note: `@repo/core-trpc` and `@repo/core-ui` are optional packages scaffolded via `pnpm turbo gen core-package trpc` / `ui`. If not present, these constraints still apply to any future installation.
+
 ## Public exports
 
 From `package.json`:

packages/core-ui/AGENTS.md

@@ -20,6 +20,8 @@ Feature-specific organisms (e.g., `ArticleCard`, `ArticleList`, `HeaderNavMenu`)
 - Any app package
 - `@repo/core-api`, `@repo/core-cms`, `@repo/core-trpc`
 
+> Note: `@repo/core-trpc` is an optional package scaffolded via `pnpm turbo gen core-package trpc`. If not present, this constraint still applies to any future installation.
+
 ## Public exports
 
 From `package.json`:

packages/marketing-pages/AGENTS.md

@@ -139,6 +139,7 @@ tests/
 - Any other feature package (`@repo/auth`, `@repo/blog`, etc.)
 - Any app package
 - `@repo/core-api`, `@repo/core-cms`, `@repo/core-trpc`, `@repo/core-ui` directly; only `@repo/core-shared`
+> Note: `@repo/core-trpc` and `@repo/core-ui` are optional packages scaffolded via `pnpm turbo gen core-package trpc` / `ui`. If not present, these constraints still apply to any future installation.
 
 ## Cross-links
 

packages/media/AGENTS.md

@@ -138,6 +138,7 @@ src/
 - Any other feature package (`@repo/auth`, `@repo/blog`, etc.)
 - Any app package
 - `@repo/core-api`, `@repo/core-cms`, `@repo/core-trpc`, `@repo/core-ui` directly; only `@repo/core-shared`
+> Note: `@repo/core-trpc` and `@repo/core-ui` are optional packages scaffolded via `pnpm turbo gen core-package trpc` / `ui`. If not present, these constraints still apply to any future installation.
 
 ## Cross-links
 

packages/navigation/AGENTS.md

@@ -121,6 +121,7 @@ src/
 - Any other feature package (`@repo/auth`, `@repo/blog`, etc.)
 - Any app package
 - `@repo/core-api`, `@repo/core-cms`, `@repo/core-trpc`, `@repo/core-ui` directly; only `@repo/core-shared`
+> Note: `@repo/core-trpc` and `@repo/core-ui` are optional packages scaffolded via `pnpm turbo gen core-package trpc` / `ui`. If not present, these constraints still apply to any future installation.
 
 ## Cross-links