Files
supabase/apps/ui-library/content/docs/tanstack/oauth-consent.mdx
19d7233580 feat(ui-library): add headless app block for TanStack Start (#49579)
## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Feature — a new UI Library block. Stacked on #49573 (already in main)

Fixes AI-1064

## What is the new behavior?

Adds `headless-app-tanstack`: customers sign in, authorize an MCP
client, and use the product through agent tool calls. It composes the
existing Password-Based Auth, OAuth Consent, and MCP Server blocks.

- `/agents` provides a copyable connection prompt, lists OAuth
authorizations, and lets customers revoke access.
- The shared MCP runtime exposes `whoami` plus example task CRUD tools.
Tools use the caller's Supabase client, with database grants and RLS
enforcing ownership.
- A root-level `supabase/` directory supplies local Auth/OAuth
configuration, a declarative tasks schema, and Edge Function files,
including `.env.example`.
- Docs cover local setup, signing keys, migrations, environment
configuration, deployment, and extending the tools.
`/example/headless-app` previews the sign-in, consent, connect, and
connected states.

Shared block fixes make a fresh install work:

- Explicit public URL resolution fixes OAuth discovery in local Edge
Runtime when middleware runtime detection fails. Both external OAuth
access tokens and ordinary authenticated app session tokens remain
supported; embedded agents do not need an additional consent flow.
- Registry targets keep backend files outside `src/`, and generated
consumer routes omit source-only TypeScript suppressions.
- Signup respects `auth.email.enable_confirmations`; sign-in/signup
preserve the return destination. Missing consent IDs retain the existing
error state without serializing `null` into the URL.

## How to test

Use the UI Library on **staging** and follow the block pages'
instructions.

1. Open the **Headless App** block page for TanStack Start. Install it
into a fresh app and follow the setup instructions through connecting an
MCP client.
2. Sign up, open `/agents`, and use the connection prompt to authorize a
client. Call `whoami`, then create, list, update, and delete a task.
3. Confirm the client appears on `/agents`. Revoke access and verify it
disappears and token refresh fails. An existing access token can
continue working until it expires.
4. Follow the **MCP Server** block page's embedded-agent instructions
using an authenticated app session. Confirm tools work without another
OAuth consent flow and `whoami` returns `client_id: null`.
5. With a second user, confirm each user can only access their own
tasks. Check that signup behaves correctly for the configured
email-confirmation setting.
6. Check the Headless App preview states and run the installed app's
typecheck and production build.

## Validation performed

Fresh local installation and browser/SDK verification passed: 26 live
MCP/Data API checks, 10 Deno tests, and 7 connection-page component
tests. Also passed UI Library typecheck, targeted lint,
registry/Markdown builds, and fresh consumer typecheck/production build.
Both OAuth and ordinary app session authentication were exercised.

Hosted deployment and consuming the confirmation-email link were not
tested.



<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Added a TanStack Headless App example with sign-in, OAuth consent, MCP
connection, and connected-agent screens.
- Added task management tools for listing, creating, updating, and
deleting tasks through MCP.
- Added connected-agent management, including server URL and prompt
copying, refresh, and access revocation.
  - Added a new Headless App registry block and documentation.

- **Bug Fixes**
- Preserved intended destinations through sign-up, email confirmation,
and protected-route login redirects.
- Improved OAuth discovery URL handling across forwarded-host
deployments.

- **Documentation**
- Updated setup, environment, deployment, and Supabase CLI guidance for
headless apps and MCP servers.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Saxon Fletcher <SaxonF@users.noreply.github.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Co-authored-by: repro <repro@local>
Co-authored-by: Raúl Barroso <code@raulb.dev>
2026-09-14 10:30:26 +10:00

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3.2 KiB
Plaintext

---
title: OAuth Consent
description: OAuth 2.1 consent block for TanStack Start
---
<BlockPreview name="oauth-consent" />
## Installation
<BlockItem
name="oauth-consent-tanstack"
description="OAuth 2.1 consent screen and the /oauth/consent route"
/>
## Folder structure
This block includes the [Supabase client](/library/docs/tanstack/client). If you already have one installed, you can skip overwriting it.
<RegistryBlock itemName="oauth-consent-tanstack" />
## Usage
This block installs an OAuth 2.1 consent route at `/oauth/consent`. It is designed for an app that already has authentication: it does not install sign-in, sign-up, or callback routes.
When the visitor has no session, the consent screen redirects to `/login` and preserves the original consent URL in the `next` query parameter. Update the `signInPath` prop in `routes/oauth/consent.tsx` if your sign-in route is different.
After sign-in, your login page must send the visitor back to the path in `next`; otherwise the OAuth flow stops at your login screen. The password-based auth and social auth blocks follow `next` automatically. For a custom login page, validate that `next` is a relative path before redirecting to it:
```ts
// After sign-in succeeds:
const next = new URLSearchParams(window.location.search).get('next')
if (next?.startsWith('/') && !next.startsWith('//')) {
// `next` may point outside the typed route tree, so use a full navigation.
window.location.assign(next)
}
```
Set `VITE_PRODUCT_NAME` in `.env.local` to replace the `Your product` placeholder
in the consent header. The [Headless App](/library/docs/tanstack/headless-app) uses
the same value for its agents page. For a custom value in code, change the
`productName` prop in `routes/oauth/consent.tsx`.
### Getting started
After installing the block, you'll have the following environment variables in your `.env.local` file:
```env
VITE_SUPABASE_URL=
VITE_SUPABASE_PUBLISHABLE_KEY=
```
- If you're using supabase.com, you can find these values in the [Connect modal](https://supabase.com/dashboard/project/_?showConnect=true&connectTab=frameworks&framework=react&using=vite&with=supabasejs) under App Frameworks or in your project's [API settings](https://supabase.com/dashboard/project/_/settings/api).
- If you're using a local instance of Supabase, you can find these values by running `supabase start` or `supabase status` (if you already have it running).
### Configure the OAuth server
Enable the OAuth server in the Supabase Dashboard under **Authentication** > **OAuth Server**, then set its authorization URL path to `/oauth/consent`. For local development, set the following in `supabase/config.toml`:
```toml
[auth.oauth_server]
enabled = true
authorization_url_path = "/oauth/consent"
```
Recent CLI versions already write an `[auth.oauth_server]` section with `enabled = false`. Edit that section rather than adding a second one, which fails with `table oauth_server already exists`.
The route expects the `authorization_id` query parameter that Supabase Auth supplies during the authorization flow.
## Further reading
- [OAuth Server](https://supabase.com/docs/guides/auth/oauth-server)
- [Supabase Auth](https://supabase.com/docs/guides/auth)