# Headless App

A backend with an agent as the primary interface

A headless app uses an AI agent as its primary interface. Users sign in and
approve access in the browser, then work through their agent using MCP tools.
This starter includes task tools and a database with Row Level Security (RLS)
that limits each user to their own data.

## Installation

Create a TanStack Start app:

```bash
pnpm dlx shadcn@latest init --template start --name my-app
cd my-app
```

Install the headless app:

Install this block:

```bash
npx shadcn@latest add @supabase/headless-app-tanstack
```

Merge `supabase/config.toml` if you already have project settings. Add
`"supabase/functions/**"` to your app's `tsconfig.json` exclusions.

## Customize

- Set `VITE_PRODUCT_NAME` in `.env.local` and edit the generated pages and components.
- Define your tables, grants, and RLS policies in `supabase/schemas/`.
- Replace `supabase/functions/mcp-server/tools/tasks.ts` with your app's operations
  and register them in `tools/index.ts`. Use the supplied user-scoped `supabase` client.
- Set `MCP_SERVER_NAME` and `MCP_SERVER_DESCRIPTION` with `supabase secrets set`.

## Deploy

Deploy the frontend using a [TanStack Start hosting adapter](https://tanstack.com/start/latest/docs/framework/react/guide/hosting).
Set these environment variables in your hosting provider before building:

```env
VITE_SUPABASE_URL=https://<project-ref>.supabase.co
VITE_SUPABASE_PUBLISHABLE_KEY=<publishable-key>
VITE_PRODUCT_NAME="Your app"
```

In `supabase/config.toml`, set `auth.site_url` to your deployed HTTPS origin,
update `auth.additional_redirect_urls` for your app's destinations, and set
`auth.email.enable_confirmations = true`. Keep the supplied OAuth and function settings.
Use an ES256 or RS256 signing key in your project's
[JWT Keys](https://supabase.com/dashboard/project/_/settings/jwt).

In [Email Templates](https://supabase.com/dashboard/project/_/auth/templates),
use this confirmation link for sign-up and change `type=email` to `type=recovery`
for password reset:

```html
<a
  href="{{ .SiteURL }}/auth/confirm?token_hash={{ .TokenHash }}&type=email&next={{ .RedirectTo | urlquery }}"
  >Confirm email</a
>
```

With the [Supabase CLI](https://supabase.com/docs/guides/local-development/cli/getting-started)
(2.117.0 or later) and Docker installed, generate a migration:

```bash
supabase db diff -f create_tasks
```

Review the migration, including grants and RLS policies, then deploy:

```bash
supabase link --project-ref <project-ref>
supabase db push
supabase config push
supabase functions deploy mcp-server
```

Open `/agents` on your deployed app, sign in, and copy the server URL into an
MCP client that supports HTTP and OAuth. Approve access to start using your tools.