diff --git a/.changeset/client-workspace.md b/.changeset/client-workspace.md
new file mode 100644
index 0000000..07b6236
--- /dev/null
+++ b/.changeset/client-workspace.md
@@ -0,0 +1,12 @@
+---
+'@seamless-auth/client': minor
+'@seamless-auth/react': patch
+---
+
+Split the framework-agnostic core into `@seamless-auth/client`, and make this repository an npm workspace that publishes both packages.
+
+`@seamless-auth/react` was one package holding two layers: the headless client, session store, and result types that any binding needs, and the React provider, hooks, and screens on top. A React Native binding is next, and it must share the first layer rather than copy it, since the session state machine is the worst place for two implementations to drift (#64).
+
+`@seamless-auth/client` now carries `createSeamlessAuthClient`, `createAuthSession`, `SessionStoragePort` and its implementations, `createFetchWithAuth`, the error and result types, the PRF helpers, role matching, and the wire type aliases. `@seamless-auth/react` depends on it and re-exports the same public surface it did before, so an application installing `@seamless-auth/react` sees no change in what it imports or how it behaves.
+
+Packaging only: no runtime behaviour changes in either package.
diff --git a/AGENTS.md b/AGENTS.md
index 2290632..f863936 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -101,15 +101,15 @@ Important implication:
 ## Wire Types
 
 Request and response shapes come from `@seamless-auth/types`, which is generated
-from the auth API's schemas. `src/types.ts` and the type declarations in
-`src/client/createSeamlessAuthClient.ts` alias that package rather than
-redeclaring shapes.
+from the auth API's schemas. `packages/client/src/types.ts` and the type
+declarations in `packages/client/src/client/createSeamlessAuthClient.ts` alias
+that package rather than redeclaring shapes.
 
 Rules for this dependency:
 
 - types only. Import with `import type` so the package's Zod dependency never
   reaches the browser bundle. There is a `Record<OAuthErrorCode, true>` in
-  `src/client/errors.ts` that exists for exactly this reason: it is a
+  `packages/client/src/client/errors.ts` that exists for exactly this reason: it is a
   compile-time membership check standing in for the upstream runtime list.
 - keep the SDK's own export names. Adopters import `Credential` from this
   package, so alias upstream shapes to local names instead of re-exporting
@@ -127,8 +127,10 @@ not wire contracts.
 
 ## Current Public API
 
-`src/index.ts` is the authoritative export list. Treat the enumeration below as a
-summary and re-check `src/index.ts` before relying on it.
+`packages/react/src/index.ts` is the authoritative export list for
+`@seamless-auth/react`, and `packages/client/src/index.ts` for
+`@seamless-auth/client`. Treat the enumeration below as a summary and re-check
+those files before relying on it.
 
 Runtime exports currently include:
 
@@ -164,13 +166,22 @@ domain models, for example:
 
 Public API changes should be treated deliberately:
 
-- if something is not exported from `src/index.ts`, it is not public
+- if something is not exported from a package's `src/index.ts`, it is not public
 - once something is exported, it should be supportable and documented
 - built-in UI should consume public primitives whenever practical instead of reaching into private helpers
 
 ## Current Architecture
 
-The current package is organized around a shared SDK core with optional UI layered on top:
+This repository is an npm workspace with two published packages:
+
+- `packages/client`, published as `@seamless-auth/client`: the framework-agnostic
+  core every binding shares. No React, no router, no DOM types beyond what
+  `fetch` and WebAuthn JSON need. Lint-enforced (`no-restricted-imports` in
+  `eslint.config.mjs`).
+- `packages/react`, published as `@seamless-auth/react`: the React binding,
+  hooks, and the optional prebuilt screens. Depends on `@seamless-auth/client`.
+
+`@seamless-auth/client`:
 
 - `src/session/createAuthSession.ts`
   - framework-agnostic session store: `getState`, `subscribe`, `actions`, `destroy`
@@ -179,12 +190,22 @@ The current package is organized around a shared SDK core with optional UI layer
 - `src/session/storage.ts`
   - `SessionStoragePort` plus browser, memory, and default implementations
   - the store's only browser dependency, which is what keeps it SSR safe
-- `src/AuthProvider.tsx`
-  - React binding over the session store, via `useSyncExternalStore`
-  - exposes the main provider context and holds no session state of its own
 - `src/client/createSeamlessAuthClient.ts`
   - shared headless auth client
   - contains the backend request choreography for login, registration, OTP, magic-link, passkey flows, and credential mutations
+- `src/client/errors.ts`, `src/client/result.ts`, `src/client/webauthnPrf.ts`, `src/client/webauthnSupport.ts`
+- `src/fetchWithAuth.ts`
+  - `/auth` request construction
+- `src/scopedRoles.ts`
+  - role matching, kept byte-for-byte with `@seamless-auth/types/role/matching`
+- `src/types.ts`
+  - aliases of the wire contract in `@seamless-auth/types`, not hand-written shapes
+
+`@seamless-auth/react`:
+
+- `src/AuthProvider.tsx`
+  - React binding over the session store, via `useSyncExternalStore`
+  - exposes the main provider context and holds no session state of its own
 - `src/hooks/useAuthClient.ts`
   - creates a memoized client from provider configuration
 - `src/hooks/usePasskeySupport.ts`
@@ -192,25 +213,28 @@ The current package is organized around a shared SDK core with optional UI layer
 - `src/AuthRoutes.tsx`
   - bundles the prebuilt auth route flow
 - `src/views/*`
-  - bundled route screens that now consume the public provider/client layer
+  - bundled route screens that consume the public provider/client layer
 - `src/components/*`
   - reusable UI pieces for those bundled screens
-- `src/fetchWithAuth.ts`
-  - `/auth` request construction
-- `src/types.ts`
-  - aliases of the wire contract in `@seamless-auth/types`, not hand-written shapes
-- `tests/*`
-  - Jest + Testing Library coverage for provider, client, hooks, and views
+- `src/utils.ts`
+  - browser-only helpers (`parseUserAgent`) and validators the screens use
+
+Tests live in each package's `tests/` directory and run as two Jest projects
+from the root (`npm test`). The React project maps `@seamless-auth/client` to the
+client package's source, so a change in the core is exercised by the React suite
+without a build in between. `packages/react/tsconfig.json` carries the same path
+mapping for type-checking; `tsconfig.build.json` drops it so the emitted
+declarations reference the package by name.
 
 Important architectural reality:
 
 - the internal-only auth context path is gone
-- built-in screens now use public primitives instead of hidden refresh helpers
-- the session state machine lives in `src/session`, not in the provider. It is
-  lint-enforced framework agnostic, so keep React and router imports out of it.
-  This is phase 1 of #64: the store stays in this repo and unexported until a
-  second binding exists to validate its API
-- remaining work is mostly docs, examples, and incremental polish rather than major extraction plumbing
+- built-in screens use public primitives instead of hidden refresh helpers
+- the session state machine lives in `@seamless-auth/client`, not in the
+  provider. Keep React, router, and React Native imports out of that package
+- this is phase 3 of #64: the workspace conversion. Ports for a native binding
+  (transport, token storage, passkeys, OAuth redirect) and the
+  `@seamless-auth/react-native` package follow as separate changes
 
 ## Backend Endpoints Assumed By The SDK
 
@@ -259,7 +283,7 @@ configured, so treat the refusal as reachable rather than exceptional.
 
 `@seamless-auth/types` 0.16.0 publishes `WebAuthnErrorCode`, which covers every
 machine code the API sends for WebAuthn across all of its operations, so
-`PasskeyPolicyErrorCode` in `src/client/errors.ts` is derived from it rather than
+`PasskeyPolicyErrorCode` in `packages/client/src/client/errors.ts` is derived from it rather than
 kept as a local list. It is that union minus `prf_output_not_allowed`, a `400`
 from login and step-up finish that reports a caller which failed to strip PRF
 output, not a deployment refusing an authenticator.
@@ -293,9 +317,9 @@ That means future work should usually build on the current public surface rather
 Bias toward these patterns:
 
 - add reusable behavior to the headless client first, then expose it through React hooks or provider helpers as needed
-- keep the session store in `src/session` as the source of truth for auth/session state, and keep `AuthProvider` a thin binding over it
+- keep the session store in `packages/client/src/session` as the source of truth for auth/session state, and keep `AuthProvider` a thin binding over it
 - use `refreshSession()` when custom flows need to synchronize provider state after a successful auth step
-- export types intentionally from `src/index.ts`
+- export types intentionally from each package's `src/index.ts`
 - keep built-in views thin and aligned with public APIs
 - update README and adjacent docs when the supported contract changes
 
diff --git a/README.md b/README.md
index 2a06f95..f2cddb7 100644
--- a/README.md
+++ b/README.md
@@ -1,1125 +1,33 @@
-# @seamless-auth/react
+# Seamless Auth client SDKs
 
-[![npm version](https://img.shields.io/npm/v/@seamless-auth/react.svg?label=%40seamless-auth%2Freact)](https://www.npmjs.com/package/@seamless-auth/react)
-[![CI](https://github.com/fells-code/seamless-auth-react/actions/workflows/ci.yml/badge.svg)](https://github.com/fells-code/seamless-auth-react/actions/workflows/ci.yml)
-[![Release](https://github.com/fells-code/seamless-auth-react/actions/workflows/release.yml/badge.svg)](https://github.com/fells-code/seamless-auth-react/actions/workflows/release.yml)
-[![coverage](https://img.shields.io/codecov/c/github/fells-code/seamless-auth-react)](https://app.codecov.io/gh/fells-code/seamless-auth-react)
-[![license](https://img.shields.io/github/license/fells-code/seamless-auth-react)](./LICENSE)
+This repository is an npm workspace that publishes the client-side packages for
+[Seamless Auth](https://github.com/fells-code/seamless-auth-api):
 
-`@seamless-auth/react` is a React SDK for Seamless Auth. It gives you a provider for auth state, a headless client and hooks for custom auth UIs, and optional prebuilt auth routes when you want a faster drop-in flow.
+| Package                                              | What it is                                                                                               |
+| ---------------------------------------------------- | -------------------------------------------------------------------------------------------------------- |
+| [`@seamless-auth/client`](packages/client/README.md) | Framework-agnostic core: the headless auth client, session store, result and error types.                |
+| [`@seamless-auth/react`](packages/react/README.md)   | React binding: `AuthProvider`, hooks, and optional prebuilt auth screens. Depends on the client package. |
 
-## What It Exports
+Most React applications only install `@seamless-auth/react`; it brings the client
+core with it. The client package exists so that other bindings (React Native
+next) share one implementation of the auth flows and session state instead of
+re-implementing them.
 
-- `AuthProvider`
-- `AuthRoutes`
-- `useAuth()`
-- `createSeamlessAuthClient()`
-- `useAuthClient()`
-- `usePasskeySupport()`
-- `hasScopedRole()` and `roleGrantsAccess()`
-- `SeamlessAuthError`, the error type carried on a failed result
-- `getOAuthErrorCode()`, which reads the known OAuth callback failure codes off that error
-- `getWebAuthnErrorDetail()`, which reads the underlying failure of a passkey or step-up ceremony
-- `getPasskeyPolicyErrorCode()`, which reads the code the API refused a passkey registration with
-- types including `AuthContextType`, `Credential`, `User`, `OAuthProvider`, `StepUpStatus`, the `SeamlessAuthResult` wrapper, and the headless client input/result types
-
-## Installation
+## Working in this repository
 
 ```bash
-npm install @seamless-auth/react
-```
-
-## Releases
-
-Published versions are listed in [CHANGELOG.md](./CHANGELOG.md) and GitHub Releases. Releases are
-managed with Changesets: adopter-facing changes include a changeset, the `Release` workflow opens a
-version PR for review, and merging that PR publishes the npm package with provenance from GitHub
-Actions. See [RELEASES.md](./RELEASES.md) for maintainer release details.
-
-## Choose Your Integration Style
-
-You can use this package in three ways:
-
-1. `AuthProvider` + `useAuth()` for auth state and core auth actions
-2. `createSeamlessAuthClient()` or `useAuthClient()` to build fully custom login and registration screens
-3. `AuthRoutes` when you want the built-in login, OTP, magic-link, and passkey screens
-
-Most apps will use `AuthProvider` either way.
-
-## Quick Start
-
-### Wrap your app with `AuthProvider`
-
-```tsx
-import { AuthProvider } from '@seamless-auth/react';
-import { BrowserRouter } from 'react-router-dom';
-
-<BrowserRouter>
-  <AuthProvider apiHost="https://your.api">
-    <AppRoutes />
-  </AuthProvider>
-</BrowserRouter>;
-```
-
-### Read auth state with `useAuth()`
-
-```tsx
-import { useAuth } from '@seamless-auth/react';
-
-function Dashboard() {
-  const { user, logout, refreshSession } = useAuth();
-
-  return (
-    <div>
-      <p>Welcome, {user?.email}</p>
-      <button onClick={() => void refreshSession()}>Refresh session</button>
-      <button onClick={() => void logout()}>Logout</button>
-    </div>
-  );
-}
-```
-
-### Use built-in auth routes with `AuthRoutes`
-
-```tsx
-import { AuthRoutes, useAuth } from '@seamless-auth/react';
-import { Route, Routes } from 'react-router-dom';
-
-function AppRoutes() {
-  const { isAuthenticated } = useAuth();
-
-  return (
-    <Routes>
-      {isAuthenticated ? (
-        <Route path="*" element={<Dashboard />} />
-      ) : (
-        <Route path="*" element={<AuthRoutes />} />
-      )}
-    </Routes>
-  );
-}
-```
-
-You are still responsible for your app’s route protection and redirects.
-
-## `useAuth()` API
-
-`useAuth()` returns the current auth state plus the provider-backed helpers:
-
-```ts
-{
-  user: User | null;
-  credentials: Credential[];
-  stepUpStatus: StepUpStatus | null;
-  isAuthenticated: boolean;
-  loading: boolean;
-  apiHost: string;
-  hasSignedInBefore: boolean;
-  markSignedIn(): void;
-  hasRole(role: string): boolean | undefined;
-  hasScopedRole(role: string | string[]): boolean | undefined;
-  listOAuthProviders(): Promise<SeamlessAuthResult<OAuthProvidersResult>>;
-  startOAuthLogin(input: StartOAuthLoginInput): Promise<SeamlessAuthResult<StartOAuthLoginResult>>;
-  finishOAuthLogin(input: FinishOAuthLoginInput): Promise<SeamlessAuthResult<MessageResult>>;
-  refreshSession(): Promise<SeamlessAuthResult<CurrentUserResult>>;
-  refreshStepUpStatus(): Promise<SeamlessAuthResult<StepUpStatus>>;
-  verifyStepUpWithPasskey(): Promise<SeamlessAuthResult<StepUpStatus>>;
-  verifyStepUpWithPasskeyPrf(input: PasskeyPrfInput): Promise<SeamlessAuthResult<StepUpPrfData>>;
-  verifyStepUpWithTotp(code: string): Promise<SeamlessAuthResult<StepUpStatus>>;
-  logout(): Promise<SeamlessAuthResult<MessageResult>>;
-  logoutAllSessions(): Promise<SeamlessAuthResult<MessageResult>>;
-  deleteUser(): Promise<SeamlessAuthResult<MessageResult>>;
-  login(identifier: string, passkeyAvailable: boolean): Promise<SeamlessAuthResult<LoginStartResult>>;
-  handlePasskeyLogin(): Promise<SeamlessAuthResult<PasskeyLoginData>>;
-  updateCredential(credential: Credential): Promise<SeamlessAuthResult<Credential>>;
-  deleteCredential(credentialId: string): Promise<SeamlessAuthResult<MessageResult>>;
-}
-```
-
-Use `refreshSession()` after completing a custom auth flow that should update provider state.
-
-### `hasSignedInBefore`
-
-`hasSignedInBefore` is a small convenience flag backed by `localStorage`. The provider reads the `seamlessauth_seen` key on load and sets the flag to `true` after `markSignedIn()` runs.
-
-This is mainly useful for login UIs that want to branch between first-time and returning-user behavior. For example, the built-in `Login` view uses it to default returning users to sign-in mode instead of registration.
-
-```tsx
-import { useAuth } from '@seamless-auth/react';
-
-function SignInHint() {
-  const { hasSignedInBefore } = useAuth();
-
-  return hasSignedInBefore ? (
-    <p>Welcome back. Sign in with your email, phone, or passkey.</p>
-  ) : (
-    <p>New here? Start by creating your account.</p>
-  );
-}
-```
-
-If you are building a fully custom flow, call `markSignedIn()` after a successful sign-in or registration step once you want future visits treated as returning-user sessions.
-
-```tsx
-const { markSignedIn, refreshSession } = useAuth();
-
-async function completeLogin() {
-  const { error } = await authClient.login({
-    identifier: 'user@example.com',
-    passkeyAvailable: true,
-  });
-
-  if (!error) {
-    markSignedIn();
-    await refreshSession();
-  }
-}
-```
-
-To disable this auto-detection entirely, pass `autoDetectPreviousSignin={false}` to `AuthProvider`.
-
-### Magic link destination
-
-By default a magic link lands wherever the deployment is configured to send it. A deployment serving
-more than one front end can override that per application with `magicLinkRedirectUri`:
-
-```tsx
-<AuthProvider apiHost={apiHost} magicLinkRedirectUri="https://app.example.com/auth/magic">
-  <AuthRoutes />
-</AuthProvider>
-```
-
-Every magic link the bundled screens send uses it, including the resend on the "check your email"
-screen, so a resent link always lands where the first one did. The deployment validates the value
-against its configured origins and refuses anything else, which comes back as an ordinary error
-result.
-
-Custom UIs get the same default through `useAuthClient()`, and can still override a single send with
-`requestMagicLink(uri)`.
-
-### Scoped roles
-
-`hasRole(role)` remains an exact role check. Use `hasScopedRole(role)` for colon-separated scoped
-roles such as `admin:read` and `admin:write`.
-
-```tsx
-const { hasRole, hasScopedRole } = useAuth();
-
-hasRole('admin'); // exact legacy role check
-hasScopedRole('admin:read'); // true for admin, admin:read, or admin:write
-hasScopedRole('admin:write'); // true for admin or admin:write
-```
-
-The package also exports standalone `hasScopedRole(roles, required)` and `roleGrantsAccess(...)`
-helpers for code that is not inside `AuthProvider`.
-
-### Step-up authentication
-
-Use step-up authentication before sensitive actions that should require a fresh user verification, such as deleting an account, changing MFA settings, or viewing recovery material.
-
-```tsx
-import { useAuth } from '@seamless-auth/react';
-
-function DeleteAccountButton() {
-  const { refreshStepUpStatus, verifyStepUpWithPasskey } = useAuth();
-
-  async function handleDeleteAccount() {
-    const { data: status } = await refreshStepUpStatus();
-    const fresh = status?.fresh ? true : !(await verifyStepUpWithPasskey()).error;
-
-    if (!fresh) {
-      return;
-    }
-
-    await deleteAccount();
-  }
-
-  return <button onClick={() => void handleDeleteAccount()}>Delete account</button>;
-}
-```
-
-Step-up supports WebAuthn/passkeys and TOTP (authenticator apps). `refreshStepUpStatus()` calls `/step-up/status`, `verifyStepUpWithPasskey()` performs the `/step-up/webauthn/start` and `/step-up/webauthn/finish` challenge flow, and `verifyStepUpWithTotp(code)` verifies a 6-digit authenticator code via `/totp/verify-mfa`. The verification helpers return a `SeamlessAuthResult<StepUpStatus>` and refresh the provider's `stepUpStatus` when they succeed.
-
-```tsx
-const { verifyStepUpWithTotp } = useAuth();
-
-const { error } = await verifyStepUpWithTotp('123456'); // 6-digit code from the authenticator app
-if (!error) {
-  // step-up is fresh; proceed with the sensitive action
-}
-```
-
-### TOTP (authenticator apps)
-
-TOTP lets users register an authenticator app (Google Authenticator, 1Password, etc.) as a second factor for step-up verification. The SDK exposes headless client methods for enrollment and management; use them from a settings screen. All require an authenticated session.
-
-```ts
-import { createSeamlessAuthClient } from '@seamless-auth/react';
-import type { TotpStatus, TotpEnrollmentStartResult } from '@seamless-auth/react';
-
-const authClient = createSeamlessAuthClient({ apiHost: 'https://your.api' });
-
-// 1. Check whether TOTP is already enabled
-const { data: status } = await authClient.getTotpStatus();
-
-// 2. Start enrollment: render `otpauthUrl` as a QR code (or show `secret` for manual entry)
-const { data: enrollment } = await authClient.startTotpEnrollment();
-
-// 3. Confirm the first code from the user's authenticator app
-const { error } = await authClient.verifyTotpEnrollment('123456');
-if (!error) {
-  // TOTP is now enabled
-}
-
-// Disabling requires a current code
-await authClient.disableTotp('123456');
-```
-
-These methods follow the standard result convention: check `error`, then read `data`. Enrolling TOTP is a sensitive change; gate it behind a fresh step-up when appropriate.
-
-> TOTP is not currently a login second factor. The Seamless Auth API issues a full session on the first factor and does not gate login on TOTP, so TOTP applies to step-up verification, not to the login flow.
-
-### WebAuthn PRF
-
-WebAuthn PRF lets a compatible passkey and browser derive local key material during a WebAuthn assertion. Seamless Auth verifies the passkey assertion on the server, while the React SDK returns the PRF output only to the browser caller. PRF output is stripped before `/webAuthn/login/finish` and `/step-up/webauthn/finish`, and should never be logged, stored, or sent to your API.
-
-Browser and authenticator support is not universal. Call `isPasskeyPrfSupported()` before offering PRF-required flows, and keep a fallback for passkeys that authenticate successfully without returning PRF output.
-
-Treat PRF salts as sensitive in client logs. PRF output is browser-local key material; keep it in
-memory only as long as your application needs it and do not send it to Seamless Auth or your own API.
-
-```ts
-import { createSeamlessAuthClient } from '@seamless-auth/react';
-
-const authClient = createSeamlessAuthClient({
-  apiHost: 'https://your.api',
-});
-
-const prfSupported = await authClient.isPasskeyPrfSupported();
-
-if (prfSupported) {
-  await authClient.registerPasskey({
-    metadata: {
-      friendlyName: 'My laptop',
-      platform: 'macOS',
-      browser: 'Chrome',
-      deviceInfo: navigator.userAgent,
-    },
-    requirePrf: true,
-  });
-}
-```
-
-For local key unwrap flows such as Seamless Secrets, use PRF during step-up and consume the returned bytes in browser memory:
-
-```ts
-const { data, error } = await authClient.verifyStepUpWithPasskeyPrf({
-  salt: vaultSaltBase64url,
-  credentialId,
-});
-
-if (error) {
-  throw error;
-}
-
-const vaultUnlockMaterial: { credentialId: string; output: Uint8Array } = {
-  credentialId: data.credentialId,
-  output: data.prf.output,
-};
-```
-
-The salt may be an `ArrayBuffer`, `ArrayBufferView`, or base64url string. Authentication proves identity and user presence; the PRF output is local key material for your application to use without sending it to Seamless Auth.
-
-### OAuth Login
-
-OAuth lets your app offer external identity providers such as Google, GitHub, Facebook, or custom
-OIDC-style providers configured on the Seamless Auth API. The React SDK does not receive provider
-access tokens. It only starts the provider redirect and completes the callback so Seamless Auth can
-issue the normal access/refresh session.
-
-Use `listOAuthProviders()` when you want to render enabled providers dynamically:
-
-```tsx
-import { useEffect, useState } from 'react';
-import { useAuth } from '@seamless-auth/react';
-import type { OAuthProvider } from '@seamless-auth/react';
-
-function OAuthButtons() {
-  const { listOAuthProviders, startOAuthLogin } = useAuth();
-  const [providers, setProviders] = useState<OAuthProvider[]>([]);
-
-  useEffect(() => {
-    void listOAuthProviders().then(result => setProviders(result.providers));
-  }, [listOAuthProviders]);
-
-  async function signIn(providerId: string) {
-    const result = await startOAuthLogin({
-      providerId,
-      redirectUri: `${window.location.origin}/oauth/callback`,
-      returnTo: `${window.location.origin}/dashboard`,
-    });
-
-    window.location.assign(result.authorizationUrl);
-  }
-
-  return (
-    <div>
-      {providers.map(provider => (
-        <button key={provider.id} onClick={() => void signIn(provider.id)}>
-          Continue with {provider.name}
-        </button>
-      ))}
-    </div>
-  );
-}
-```
-
-Create a callback route that reads the provider query params and asks Seamless Auth to complete the
-login:
-
-```tsx
-import { useEffect } from 'react';
-import { useAuth } from '@seamless-auth/react';
-
-function OAuthCallback() {
-  const { finishOAuthLogin } = useAuth();
-
-  useEffect(() => {
-    const params = new URLSearchParams(window.location.search);
-    // Persist the provider you passed to startOAuthLogin so the callback knows
-    // which provider to finish. The built-in AuthRoutes flow stores this in
-    // sessionStorage; use whatever your custom start flow saved.
-    const providerId = sessionStorage.getItem('seamless:oauth:provider');
-    const code = params.get('code');
-    const state = params.get('state');
-
-    if (!providerId || !code || !state) {
-      return;
-    }
-
-    void finishOAuthLogin({ providerId, code, state }).then(() => {
-      window.location.assign('/dashboard');
-    });
-  }, [finishOAuthLogin]);
-
-  return <p>Finishing sign-in...</p>;
-}
-```
-
-Some callback failures are the user's to fix, so the API returns a stable `code` alongside the error
-message. `getOAuthErrorCode()` narrows it to the codes this SDK knows about and returns `undefined`
-for everything else, so unexpected failures keep your generic message:
-
-```tsx
-import { getOAuthErrorCode, useAuth } from '@seamless-auth/react';
-
-const { error } = await finishOAuthLogin({ providerId, code, state });
-
-switch (getOAuthErrorCode(error)) {
-  case 'oauth_missing_email':
-    // The provider account shared no email address.
-    break;
-  case 'oauth_email_not_verified':
-    // The provider account's email is unverified.
-    break;
-  case 'oauth_missing_subject':
-    // The provider returned no usable account identifier.
-    break;
-  default:
-    // No error, or one without a recognized code.
-    break;
-}
+npm install
+npm run lint
+npm test
+npm run build
 ```
 
-The bundled `AuthRoutes` callback screen already maps these three codes to actionable text.
-
-For fully custom UI without `useAuth()`, call the headless client directly:
-
-```ts
-const providers = await authClient.listOAuthProviders();
-const started = await authClient.startOAuthLogin({
-  providerId: providers.providers[0].id,
-  redirectUri: `${window.location.origin}/oauth/callback`,
-});
-
-window.location.assign(started.authorizationUrl);
-```
-
-OAuth must be enabled on the Seamless Auth API with `LOGIN_METHODS` including `oauth` and at least
-one configured `oauth_providers` entry. Provider client secrets live on the server and are referenced
-by environment variable name; they are never passed through this SDK.
-
-For production providers, configure exact `redirectUris` on the Seamless Auth API. The SDK should
-send the callback URL it expects to receive, but redirect allowlisting, signed state expiry, OIDC
-nonce handling, email verification policy, and account-linking policy are enforced by the API.
-
-The built-in views avoid logging OTPs, magic-link tokens, PRF salts, or raw
-exception payloads that may contain sensitive request URLs.
-
-## Headless Client
-
-For custom auth UIs, use the exported client directly:
-
-```ts
-import { createSeamlessAuthClient } from '@seamless-auth/react';
-
-const authClient = createSeamlessAuthClient({
-  apiHost: 'https://your.api',
-});
-
-const { data, error } = await authClient.login({
-  identifier: 'user@example.com',
-  passkeyAvailable: true,
-});
-
-if (error) {
-  // error.message, error.status, and error.body carry the server detail
-  return;
-}
-
-// data is typed as LoginStartResult
-console.log(data.loginMethods);
-```
-
-The headless client exposes helpers for:
-
-- current-user/session lookup
-- login and passkey login
-- registration
-- phone OTP and email OTP
-- magic-link request, verify, and polling
-- OAuth provider listing, start, and callback completion
-- passkey registration
-- step-up status, passkey verification, and TOTP verification
-- TOTP enrollment, status, and disable
-- logout and delete-user
-- credential update and deletion
-
-### Where the response types come from
-
-The request and response types are aliases of
-[`@seamless-auth/types`](https://www.npmjs.com/package/@seamless-auth/types), which is generated from
-the auth API's schemas. `User`, `Credential`, `Organization`, `StepUpStatus`, `MessageResult`, and the
-other wire shapes describe what the API actually sends, rather than a second copy maintained here that
-could drift from it.
-
-The dependency is types-only. Nothing from it is imported at runtime, so no schema validation library
-reaches your bundle. Names exported from this package stay the SDK's own, so you keep importing
-`Credential` from `@seamless-auth/react`.
-
-Two SDK concerns are deliberately not shared, because they are not wire contracts: the PRF helper
-types and the `SeamlessAuthResult` wrapper.
-
-### Result convention
-
-Every request method resolves to a `SeamlessAuthResult<T>`:
-
-```ts
-type SeamlessAuthResult<T> =
-  | { data: T; error: null }
-  | { data: null; error: SeamlessAuthError };
-```
-
-Check `error` first, then read `data`. TypeScript enforces this: `data` is not readable until the
-error has been ruled out.
-
-```ts
-const { data, error } = await authClient.getCurrentUser();
-
-if (error) {
-  console.log(error.message, error.status, error.body);
-  return;
-}
-
-setUser(data.user); // typed as CurrentUserResult
-```
-
-Nothing throws for an HTTP failure, and transport failures are absorbed too, reported as an error
-with `status` `0`. That means an expected auth outcome such as a wrong OTP, an expired magic link, or
-a disabled provider is a value you can map straight to UI state rather than an exception to catch.
-
-`SeamlessAuthError` carries the server's `message`, the HTTP `status`, and the parsed response
-`body`, so you can branch on a specific failure.
-
-### WebAuthn ceremony failures
-
-A passkey or step-up ceremony can fail in the browser before any request is sent, so those results
-carry the thrown error as `cause` with `status` `0`. Use `getWebAuthnErrorDetail()` to read it: the
-`name` is the `DOMException` name that separates the cases a user can act on, and `code` is
-SimpleWebAuthn's narrower reason when it identified one.
-
-```ts
-import { getWebAuthnErrorDetail } from '@seamless-auth/react';
-
-const { error } = await authClient.verifyStepUpWithPasskey();
-const detail = getWebAuthnErrorDetail(error);
-
-switch (detail?.name) {
-  case 'NotAllowedError':
-    // The prompt was dismissed, or the account has no passkey to assert.
-    break;
-  case 'SecurityError':
-    // The origin or RP ID does not match what the API is configured for.
-    break;
-  case 'InvalidStateError':
-    // This authenticator already holds a passkey for the account.
-    break;
-  default:
-    // Not a ceremony failure. Fall back to error?.message.
-    break;
-}
-```
-
-`getWebAuthnErrorDetail()` returns `undefined` for any error that did not come from a ceremony, so an
-HTTP failure keeps flowing through `error.message` and `error.body` as usual.
-
-### Choosing the authenticator
-
-By default the browser offers every kind of authenticator the deployment enrols, which is what
-`authenticator_policy.attachment: 'any'` means on the API. Pass `attachment` to narrow the picker to
-one kind, for example to send someone straight to an issued security key rather than leaving them to
-find it in a browser dialog:
-
-```ts
-import { getPasskeyPolicyErrorCode } from '@seamless-auth/react';
-
-const { error } = await authClient.registerPasskey({
-  metadata,
-  attachment: 'cross-platform',
-});
-
-if (getPasskeyPolicyErrorCode(error) === 'attachment_not_allowed') {
-  // This deployment pins the other kind. Fall back to the default path.
-}
-```
-
-`'cross-platform'` is a roaming authenticator such as a USB or NFC security key. `'platform'` is the
-one built into the device, such as Touch ID or Windows Hello. Omit the option to leave the choice to
-the deployment.
-
-This is a request, not an override. A deployment that has pinned
-`authenticator_policy.attachment` to the other kind refuses the registration with
-`attachment_not_allowed`, covered below. The bundled enrolment view offers a "Use a security key
-instead" control that takes this path.
-
-### Passkey policy refusals
-
-A registration can also be refused by the policy the API is configured with. `registerPasskey()`
-then fails with a body whose `error` is a stable code rather than a sentence, so rendering
-`error.message` would put that code in front of a user. Use `getPasskeyPolicyErrorCode()` to branch
-on it:
-
-```ts
-import { getPasskeyPolicyErrorCode } from '@seamless-auth/react';
-
-const { error } = await authClient.registerPasskey({ metadata });
-
-switch (getPasskeyPolicyErrorCode(error)) {
-  case 'attachment_not_allowed':
-    // The requested `attachment` is not the kind this deployment enrols.
-    break;
-  case 'synced_passkey_not_allowed':
-    // This passkey syncs to iCloud Keychain or Google Password Manager, and
-    // this deployment requires a device-bound one such as a security key.
-    break;
-  case 'authenticator_not_allowed':
-    // This authenticator model is not permitted here.
-    break;
-  case 'prf_required':
-    // Registration asked for PRF and the authenticator does not support it.
-    break;
-  default:
-    // No error, or one without a recognized code. Fall back to error?.message.
-    break;
-}
-```
-
-| Code                         | Stage           | Status | When the API sends it                                                                        |
-| ---------------------------- | --------------- | ------ | -------------------------------------------------------------------------------------------- |
-| `attachment_not_allowed`     | register/start  | 400    | the requested `attachment` is not the kind `authenticator_policy.attachment` pins            |
-| `synced_passkey_not_allowed` | register/finish | 403    | `authenticator_policy.syncedPasskeys` is `block` and the credential is backup eligible       |
-| `authenticator_not_allowed`  | register/finish | 403    | the credential's AAGUID is on `aaguidDenyList`, or absent from a non-empty `aaguidAllowList` |
-| `prf_required`               | register/finish | 403    | registration required PRF and the credential did not report support for it                   |
-
-`attachment_not_allowed` is refused before any ceremony runs, so the browser never prompts. The rest
-are refused after a credential exists and can be inspected.
-
-`syncedPasskeys` defaults to `allow` on the Seamless Auth API, so a default deployment enrols the
-passkeys iCloud Keychain and Google Password Manager create. A deployment that issues its own
-authenticators can set `authenticator_policy.syncedPasskeys` to `block` in the API's system config,
-and every backup-eligible passkey is then refused at registration. Handle the code: the SDK cannot
-tell from the client which way the API is configured.
-
-Like `getOAuthErrorCode()`, this returns `undefined` for anything it does not recognize, including
-codes added by a newer API, so an unexpected refusal keeps your generic messaging.
-
-The single exception is `isPasskeySupported`-style capability checks:
-`isPasskeyPrfSupported(): Promise<boolean>` is a local check rather than a request, so it returns a
-plain boolean.
-
-## React Hooks For Custom UI
-
-If you want custom React screens but do not want to manually recreate the client, use the exported hooks:
-
-```tsx
-import { useAuth, useAuthClient, usePasskeySupport } from '@seamless-auth/react';
-
-function CustomLogin() {
-  const { refreshSession } = useAuth();
-  const authClient = useAuthClient();
-  const { passkeySupported, loading } = usePasskeySupport();
-
-  async function handleEmailLogin() {
-    const { error } = await authClient.login({
-      identifier: 'user@example.com',
-      passkeyAvailable: passkeySupported,
-    });
-
-    if (!error) {
-      await refreshSession();
-    }
-  }
-
-  return (
-    <button disabled={loading} onClick={() => void handleEmailLogin()}>
-      Sign in
-    </button>
-  );
-}
-```
-
-### One error style everywhere
-
-`useAuth()` helpers and the headless client report failure the same way: both return
-`{ data, error }` and neither throws. Whatever surface you reach for, the handling is identical.
-
-```tsx
-const { error } = await updateCredential({ ...credential, friendlyName: 'Work laptop' });
-
-if (error) {
-  setMessage(error.message);
-}
-```
-
-Helpers that also mutate provider state, such as `switchOrganization` and `deleteCredential`, apply
-that state change only when the call succeeds, then hand the result back for you to inspect.
-
-## Custom UI Recipes
-
-Worked examples for the flows the bundled screens cover, using only public primitives.
-
-### Custom registration
-
-Registration is two steps: create the account, then verify the emailed code. Call `markSignedIn()`
-once the account is live so returning visits can default to sign-in.
-
-```tsx
-import { useAuth, useAuthClient } from '@seamless-auth/react';
-import { useState } from 'react';
-
-function CustomRegistration() {
-  const { markSignedIn, refreshSession } = useAuth();
-  const authClient = useAuthClient();
-  const [step, setStep] = useState<'details' | 'verify'>('details');
-  const [message, setMessage] = useState('');
-
-  async function createAccount(email: string) {
-    // Registration needs only an email. A phone can be added and verified later.
-    const { error } = await authClient.register({ email });
-
-    if (error) {
-      setMessage(error.message);
-      return;
-    }
-
-    // The API emails a verification code as part of registering.
-    setStep('verify');
-  }
-
-  async function verifyCode(code: string) {
-    const { error } = await authClient.verifyEmailOtp(code);
-
-    if (error) {
-      setMessage(error.message);
-      return;
-    }
-
-    markSignedIn();
-    await refreshSession();
-  }
-
-  return step === 'details' ? (
-    <DetailsForm onSubmit={createAccount} error={message} />
-  ) : (
-    <CodeForm
-      onSubmit={verifyCode}
-      onResend={() => authClient.requestEmailOtp()}
-      error={message}
-    />
-  );
-}
-```
-
-Enrolment takes the signed-in session, so it comes after the step that establishes one.
-Verifying the email OTP signs the user in, which is why the bundled flow offers a passkey
-on the screen after it rather than before.
-
-To offer a passkey right after registering, call `registerPasskey()` before `refreshSession()`:
-
-```ts
-const { data, error } = await authClient.registerPasskey({
-  friendlyName: 'My laptop',
-  platform: 'macOS',
-  browser: 'Chrome',
-  deviceInfo: navigator.userAgent,
-});
-
-if (!error) {
-  console.log(data.credentialId, data.prfCapable);
-}
-```
-
-### Adding a passkey from a settings screen
-
-The same call adds a passkey to an account that already has one, or gives one to a user
-who declined at signup. Use it from `useAuth()` rather than the client directly: that
-version refreshes the session afterwards, so `credentials` includes the new passkey
-without a reload.
-
-```tsx
-function AddPasskey() {
-  const { registerPasskey, credentials } = useAuth();
-
-  const add = async () => {
-    const { error } = await registerPasskey({
-      friendlyName: 'My laptop',
-      platform: 'macOS',
-      browser: 'Chrome',
-      deviceInfo: navigator.userAgent,
-    });
-
-    if (error) {
-      // A 401 means the session expired rather than anything about the
-      // authenticator. `isUnauthenticated(error)` tells the two apart.
-    }
-  };
-
-  return (
-    <>
-      <p>{credentials.length} passkeys</p>
-      <button onClick={add}>Add a passkey</button>
-    </>
-  );
-}
-```
-
-### OTP and magic-link continuation
-
-> **The request helpers take no identifier.** `requestMagicLink()`, `requestLoginEmailOtp()`, and
-> `requestLoginPhoneOtp()` send nothing but the session cookie. They rely on server-side state
-> established by a preceding `login()` call, so calling them without it fails or targets the wrong
-> account. This is not obvious from their signatures. Always call `login()` first, and use the same
-> browser session for the continuation step.
-
-```tsx
-function CustomLoginContinuation() {
-  const { login, refreshSession } = useAuth();
-  const authClient = useAuthClient();
-
-  async function start(identifier: string) {
-    // Required first: this is what the request helpers below depend on.
-    const { data, error } = await login(identifier, false);
-
-    if (error) {
-      return;
-    }
-
-    // Offer only what the server says this account supports.
-    return data.loginMethods ?? ['magic_link', 'email_otp'];
-  }
-
-  async function sendEmailCode() {
-    const { error } = await authClient.requestLoginEmailOtp();
-    if (error) {
-      // surface error.message
-    }
-  }
-
-  async function submitEmailCode(code: string) {
-    const { error } = await authClient.verifyLoginEmailOtp(code);
-
-    if (!error) {
-      await refreshSession();
-    }
-  }
-}
-```
-
-Magic links complete in whichever tab opens the emailed link, so a custom flow needs two pieces.
-
-The waiting screen polls until the link is used:
-
-```ts
-const interval = setInterval(async () => {
-  const { error } = await authClient.checkMagicLink();
-
-  if (!error) {
-    clearInterval(interval);
-    await refreshSession();
-  }
-}, 5000);
-```
-
-The landing route verifies the token from the query string, then refreshes its own session:
-
-```tsx
-function CustomMagicLinkLanding() {
-  const { refreshSession } = useAuth(); // plus: import { useEffect } from 'react'
-  const authClient = useAuthClient();
-
-  useEffect(() => {
-    const token = new URLSearchParams(window.location.search).get('token');
-    if (!token) return;
-
-    void authClient.verifyMagicLink(token).then(async ({ error }) => {
-      if (!error) {
-        // Refresh here too. This tab set the cookie, but its provider state
-        // was loaded before the cookie existed.
-        await refreshSession();
-      }
-    });
-  }, [authClient, refreshSession]);
-
-  return <p>Finishing sign-in...</p>;
-}
-```
-
-The auth API emails a link pointing at `/verify-magiclink?token=...`, so a custom app must serve that
-path.
-
-### Credential management
-
-`useAuth()` exposes the signed-in user's passkeys plus helpers to rename and remove them. These
-helpers update provider state on success and report failure through `error`.
-
-```tsx
-import { useAuth } from '@seamless-auth/react';
-import type { Credential } from '@seamless-auth/react';
-import { useState } from 'react';
-
-function PasskeyList() {
-  const { credentials, updateCredential, deleteCredential } = useAuth();
-  const [message, setMessage] = useState('');
-
-  async function rename(credential: Credential, friendlyName: string) {
-    const { error } = await updateCredential({ ...credential, friendlyName });
-
-    if (error) {
-      setMessage(error.message);
-    }
-  }
-
-  async function remove(credentialId: string) {
-    const { error } = await deleteCredential(credentialId);
-
-    if (error) {
-      setMessage(error.message);
-    }
-  }
-
-  return (
-    <ul>
-      {credentials.map(credential => (
-        <li key={credential.id}>
-          {credential.friendlyName ?? credential.deviceInfo}
-          <button onClick={() => void rename(credential, 'Work laptop')}>Rename</button>
-          <button onClick={() => void remove(credential.id)}>Remove</button>
-        </li>
-      ))}
-    </ul>
-  );
-}
-```
-
-`Credential.lastUsedAt` and `Credential.createdAt` are ISO 8601 strings, which is what the API sends.
-Wrap them yourself to format:
-
-```tsx
-const lastUsed = credential.lastUsedAt ? new Date(credential.lastUsedAt) : null;
-```
-
-Removing a passkey is a sensitive change. Gate it behind a fresh step-up when the account has other
-factors, using `refreshStepUpStatus()` and `verifyStepUpWithPasskey()` from the step-up section.
-
-## Built-In Routes
-
-`AuthRoutes` serves these canonical paths:
-
-- `/login`
-- `/passkey-login`
-- `/verify-phone-otp`
-- `/verify-email-otp`
-- `/verify-magic-link`
-- `/oauth/callback`
-- `/register-passkey`
-- `/magic-link-sent`
-
-These are optional UI wrappers over the same SDK primitives the package now exports for custom flows.
-
-### Renamed routes
-
-The earlier mixed-case paths were renamed and are no longer served. Anything linking directly to
-them now falls through to `/login`, so update those links:
-
-| Old path           | New path            |
-| ------------------ | ------------------- |
-| `/passKeyLogin`    | `/passkey-login`    |
-| `/verifyPhoneOTP`  | `/verify-phone-otp` |
-| `/verifyEmailOTP`  | `/verify-email-otp` |
-| `/registerPasskey` | `/register-passkey` |
-| `/magiclinks-sent` | `/magic-link-sent`  |
-
-Two paths are unchanged because they are owned by contracts outside this package:
-
-- `/verify-magiclink` is the URL the auth API builds when it emails a magic link, so it has to match
-  that value exactly. Renaming it here would send every emailed link to `/login` with the token
-  discarded.
-- `/oauth/callback` is registered with OAuth providers as an allowed redirect URI, so renaming it
-  would break configured integrations.
-
-## Theming The Built-In UI
-
-Every colour in the built-in screens is a CSS custom property with a fallback, so the default look is
-unchanged if you set nothing. To match your brand, set the tokens you care about on `:root`, or on any
-element that wraps `<AuthRoutes />`.
-
-```css
-:root {
-  --seamless-accent: #1f3a34;
-  --seamless-accent-hover: #16302b;
-  --seamless-surface: #f7f5f0;
-  --seamless-text: #1a1a1a;
-}
-```
-
-Scoping to a wrapper also works, which is useful when the auth screens should look different from the
-rest of the app:
-
-```css
-.auth-shell {
-  --seamless-accent: #1f3a34;
-  --seamless-accent-soft: #3c6f63;
-}
-```
-
-There is no provider prop or JavaScript API for this. Setting the variables is the whole interface.
-
-### Tokens
-
-| Token                        | Used for                                                               | Default                                       |
-| ---------------------------- | ---------------------------------------------------------------------- | --------------------------------------------- |
-| `--seamless-accent`          | Primary buttons, focus rings, selected states, accent borders, spinner | `#2563eb` fills, `#3b82f6` rings and borders  |
-| `--seamless-accent-hover`    | Hover state of primary buttons                                         | `#1d4ed8`                                     |
-| `--seamless-accent-contrast` | Label text on accent-filled buttons                                    | `white`                                       |
-| `--seamless-accent-soft`     | Links, toggle buttons, accent icons                                    | `#60a5fa`, `#a5b4fc` on the magic-link screen |
-| `--seamless-surface`         | Card and modal backgrounds                                             | `#1f2937`                                     |
-| `--seamless-surface-raised`  | Inputs and panels sitting on a card                                    | `#374151`, `#4b5563` on the login form        |
-| `--seamless-surface-hover`   | Hover state of secondary buttons                                       | `#4b5563`                                     |
-| `--seamless-border`          | Input, button, and panel borders                                       | `#4b5563`, `#d1d5db`                          |
-| `--seamless-text`            | Headings and body text                                                 | `white`                                       |
-| `--seamless-text-muted`      | Labels, helper text, secondary copy                                    | `#9ca3af`, `#d1d5db`                          |
-| `--seamless-danger`          | Error messages                                                         | `#f87171`                                     |
-| `--seamless-success`         | Success messages and the verified check icon                           | `#34d399`                                     |
-| `--seamless-warning`         | OTP countdown and resend timers                                        | `#facc15`                                     |
-| `--seamless-overlay`         | Modal backdrop scrim                                                   | `rgba(0, 0, 0, 0.45)`                         |
-| `--seamless-shadow`          | Card and modal shadow colour                                           | `rgba(0, 0, 0, 0.1)` to `rgba(0, 0, 0, 0.4)`  |
-
-### Notes
-
-- Where the original design used near-duplicate shades for the same role, each declaration keeps its
-  own original value as the fallback. That is why some rows list more than one default. Nothing shifts
-  until you set the token, and once you do, every use of that role picks up your value.
-- `--seamless-shadow` is the shadow colour only. Offsets and blur are fixed. Setting it applies one
-  colour to every shadow in the built-in UI, replacing the per-screen alpha values.
-- If you set `--seamless-surface` to a light colour, set `--seamless-text` too. The default text
-  colour is white and will disappear otherwise.
-- Two decorative tints are deliberately not tokenised: the pulse ring behind the magic-link mail icon
-  and the disc behind the success check. Both are translucent and sit directly under an icon, so an
-  opaque override would hide the icon it is meant to frame.
-- Disabled buttons are not a separate colour. They are the enabled button at reduced opacity, so the
-  label and its background always come from the same accent pair you set and the contrast between
-  them cannot invert when the theme changes. `--seamless-disabled` used to set a standalone grey fill
-  and no longer does anything; remove it from your overrides.
-- The package ships one palette and no `prefers-color-scheme` rules. If you want the auth UI to follow
-  the system theme, wrap your own overrides in a media query.
-
-## Backend Expectations
-
-This package assumes a Seamless Auth-compatible backend with the auth adapter mounted at `/auth`.
-
-- Requests target `${apiHost}/auth/...`
-- `apiHost` may be provided with or without a trailing slash
-- Requests are sent with `credentials: 'include'`
-- `AuthProvider` validates the current session by calling `/users/me` on load
-
-The built-in flows assume compatible endpoints for:
-
-- `/login`
-- `DELETE /logout` for the current session
-- `DELETE /logout/all` for every session owned by the current user
-- `/registration/register`
-- `/webAuthn/login/start`
-- `/webAuthn/login/finish`
-- `/webAuthn/register/start`
-- `/webAuthn/register/finish`
-- `POST /otp/generate-phone-otp`
-- `POST /otp/generate-email-otp`
-- `/otp/verify-phone-otp`
-- `/otp/verify-email-otp`
-- `POST /otp/generate-login-phone-otp`
-- `POST /otp/generate-login-email-otp`
-- `/otp/verify-login-phone-otp`
-- `/otp/verify-login-email-otp`
-- `POST /magic-link`
-- `/magic-link/check`
-- `/magic-link/verify/:token`
-- `/oauth/providers`
-- `/oauth/:providerId/start`
-- `/oauth/:providerId/callback`
-- `/step-up/status`
-- `/step-up/webauthn/start`
-- `/step-up/webauthn/finish`
-- `/totp/status`
-- `/totp/enroll/start`
-- `/totp/enroll/verify`
-- `/totp/disable`
-- `/totp/verify-mfa`
-- `/users/me`
-- `/users/credentials`
-- `/users/delete`
-- `/organizations`
-- `/organizations/:organizationId`
-- `/organizations/:organizationId/switch`
-- `/organizations/:organizationId/members`
-- `/organizations/:organizationId/members/:userId`
-
-The state-changing OTP and magic-link request routes are `POST` (marked above). They were previously
-`GET`, which made them reachable as simple cross-site requests, so an `<img>` tag could trigger SMS or
-email sends to a signed-in user. Using `@seamless-auth/react` with an older adapter that only serves the
-`GET` forms returns a 404 for those requests. See the changelog for the minimum adapter version.
-
-`/webAuthn/register/finish` can refuse a verified credential on policy grounds with a `403` whose
-body is a stable code. `syncedPasskeys` defaults to `allow`, but a deployment that sets `block`
-refuses every backup-eligible passkey, so handle the code rather than assuming the default. See
-[Passkey policy refusals](#passkey-policy-refusals).
-
-## Notes
-
-- This package does not create its own `<BrowserRouter>`.
-- It is designed to fit into your app’s existing routing tree.
-- The quickest path is `AuthProvider` + `AuthRoutes`.
-- The most flexible path is `AuthProvider` + custom UI using `useAuth()`, `useAuthClient()`, and `usePasskeySupport()`.
+Tests run as one Jest project per package from the root. The React project
+resolves `@seamless-auth/client` to the client package's source, so a change in
+the core is exercised by the React suite without a build in between. Releases
+are managed with Changesets; see [RELEASES.md](RELEASES.md) and
+[CONTRIBUTING.md](CONTRIBUTING.md).
 
 ## License
 
-AGPL-3.0-only
+AGPL-3.0-only. See [LICENSE](LICENSE).
diff --git a/eslint.config.mjs b/eslint.config.mjs
index 82571ff..371fda5 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -56,15 +56,9 @@ export default [
     },
   },
   {
-    // The client layer stays framework agnostic so it can be extracted into a
-    // shared package for non-React adapters. See #64.
-    files: [
-      'src/client/**/*.ts',
-      'src/session/**/*.ts',
-      'src/fetchWithAuth.ts',
-      'src/scopedRoles.ts',
-      'src/types.ts',
-    ],
+    // @seamless-auth/client is the framework-agnostic core every binding shares,
+    // so nothing React (or from a binding) may enter it. See #64.
+    files: ['packages/client/src/**/*.ts'],
     rules: {
       'no-restricted-imports': [
         'error',
@@ -78,25 +72,19 @@ export default [
                 'react-dom/*',
                 'react-router',
                 'react-router-dom',
+                'react-native',
+                'react-native/*',
               ],
               message:
-                'The client layer must stay framework agnostic. Keep React and router imports in the binding layer. See #64.',
+                'The client core must stay framework agnostic. Keep React and router imports in a binding package. See #64.',
             },
             {
               group: [
-                '@/AuthProvider',
-                '@/AuthRoutes',
-                '@/hooks/*',
-                '@/views/*',
-                '@/components/*',
-                '**/AuthProvider',
-                '**/AuthRoutes',
-                '**/hooks/*',
-                '**/views/*',
-                '**/components/*',
+                '@seamless-auth/react',
+                '@seamless-auth/react-native',
+                '../react/*',
               ],
-              message:
-                'The client layer must not import from the React binding layer. See #64.',
+              message: 'The client core must not import from a binding package. See #64.',
             },
           ],
         },
@@ -104,6 +92,6 @@ export default [
     },
   },
   {
-    ignores: ['dist/', 'coverage/', 'node_modules/'],
+    ignores: ['**/dist/', '**/coverage/', '**/node_modules/'],
   },
 ];
diff --git a/jest.config.ts b/jest.config.ts
index 1016064..ff7db69 100644
--- a/jest.config.ts
+++ b/jest.config.ts
@@ -1,19 +1,5 @@
 export default {
-  preset: 'ts-jest',
-  testEnvironment: 'jsdom',
-  setupFilesAfterEnv: ['<rootDir>/jest.setup.ts'],
-  transform: {
-    '^.+\\.(t|j)sx?$': ['ts-jest', { useESM: true, tsconfig: './tsconfig.json' }],
-  },
-  extensionsToTreatAsEsm: ['.ts', '.tsx'],
-  moduleNameMapper: {
-    '\\.(css|less|scss|sass)$': 'identity-obj-proxy',
-    '^@/(.*)$': '<rootDir>/src/$1',
-  },
-  testMatch: [
-    '<rootDir>/tests/**/*.(test|spec).[tj]s?(x)',
-    '<rootDir>/src/**/*.(test|spec).[tj]s?(x)',
-  ],
+  projects: ['<rootDir>/packages/client', '<rootDir>/packages/react'],
   collectCoverage: true,
   collectCoverageFrom: ['src/**/*.{ts,tsx}', '!src/**/*.d.ts'],
   coverageThreshold: {
diff --git a/package-lock.json b/package-lock.json
index a8d9991..fdab5a2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,20 +1,16 @@
 {
-  "name": "@seamless-auth/react",
+  "name": "seamless-auth-client-sdks",
   "version": "0.10.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "@seamless-auth/react",
-      "version": "0.10.0",
+      "name": "seamless-auth-client-sdks",
       "license": "AGPL-3.0-only",
-      "dependencies": {
-        "@seamless-auth/types": "^0.20.0",
-        "@simplewebauthn/browser": "^13.1.0",
-        "eslint-plugin-license-header": "^0.9.0",
-        "libphonenumber-js": "^1.12.7",
-        "ts-node": "^10.9.2"
-      },
+      "workspaces": [
+        "packages/client",
+        "packages/react"
+      ],
       "devDependencies": {
         "@changesets/cli": "^2.31.0",
         "@commitlint/cli": "^20.1.0",
@@ -34,6 +30,7 @@
         "eslint": "^9.38.0",
         "eslint-config-prettier": "^10.1.8",
         "eslint-plugin-import": "^2.32.0",
+        "eslint-plugin-license-header": "^0.9.0",
         "eslint-plugin-react": "^7.37.5",
         "eslint-plugin-react-hooks": "^5.2.0",
         "eslint-plugin-react-refresh": "^0.4.24",
@@ -44,9 +41,11 @@
         "jest-environment-jsdom": "^30.2.0",
         "lint-staged": "^16.2.5",
         "prettier": "^3.6.2",
+        "rollup": "^4.59.0",
         "rollup-plugin-peer-deps-external": "^2.2.4",
         "rollup-plugin-postcss": "^4.0.2",
         "ts-jest": "^29.4.5",
+        "ts-node": "^10.9.2",
         "tsc-alias": "^1.9.1",
         "tslib": "^2.7.0",
         "typescript": "^5.9.3",
@@ -55,11 +54,6 @@
       "engines": {
         "node": ">=24.0.0 <25.0.0",
         "npm": ">=9.0.0 <13.0.0"
-      },
-      "peerDependencies": {
-        "react": "^18.0.0 || ^19.0.0",
-        "react-dom": "^18.0.0 || ^19.0.0",
-        "react-router-dom": "^6.4.0 || ^7.15.1"
       }
     },
     "node_modules/@adobe/css-tools": {
@@ -1150,6 +1144,7 @@
       "version": "0.8.1",
       "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz",
       "integrity": "sha512-IchNf6dN4tHoMFIn/7OE8LWZ19Y6q/67Bmf6vnGREv8RSbBVb9LPJxEcnwrcwX6ixSvaiGoomAUvu4YSxXrVgw==",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "@jridgewell/trace-mapping": "0.3.9"
@@ -1162,6 +1157,7 @@
       "version": "0.3.9",
       "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.9.tgz",
       "integrity": "sha512-3Belt6tdc8bPgAtbcmdtNJlirVoTmEb5e2gC94PnkwEW9jI6CAHUeoG85tjWP5WquqfavoMtMwiG4P926ZKKuQ==",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "@jridgewell/resolve-uri": "^3.0.3",
@@ -1287,6 +1283,7 @@
       "version": "4.9.1",
       "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.1.tgz",
       "integrity": "sha512-phrYmNiYppR7znFEdqgfWHXR6NCkZEK7hwWDHZUjit/2/U0r6XvkDl0SYnoM51Hq7FhCGdLDT6zxCCOY1hexsQ==",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "eslint-visitor-keys": "^3.4.3"
@@ -1305,6 +1302,7 @@
       "version": "3.4.3",
       "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-3.4.3.tgz",
       "integrity": "sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag==",
+      "dev": true,
       "license": "Apache-2.0",
       "engines": {
         "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
@@ -1317,6 +1315,7 @@
       "version": "4.12.2",
       "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.2.tgz",
       "integrity": "sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==",
+      "dev": true,
       "license": "MIT",
       "engines": {
         "node": "^12.0.0 || ^14.0.0 || >=16.0.0"
@@ -1326,6 +1325,7 @@
       "version": "0.21.1",
       "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.21.1.tgz",
       "integrity": "sha512-aw1gNayWpdI/jSYVgzN5pL0cfzU02GT3NBpeT/DXbx1/1x7ZKxFPd9bwrzygx/qiwIQiJ1sw/zD8qY/kRvlGHA==",
+      "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
         "@eslint/object-schema": "^2.1.7",
@@ -1340,6 +1340,7 @@
       "version": "0.4.2",
       "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.4.2.tgz",
       "integrity": "sha512-gBrxN88gOIf3R7ja5K9slwNayVcZgK6SOUORm2uBzTeIEfeVaIhOpCtTox3P6R7o2jLFwLFTLnC7kU/RGcYEgw==",
+      "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
         "@eslint/core": "^0.17.0"
@@ -1352,6 +1353,7 @@
       "version": "0.17.0",
       "resolved": "https://registry.npmjs.org/@eslint/core/-/core-0.17.0.tgz",
       "integrity": "sha512-yL/sLrpmtDaFEiUj1osRP4TI2MDz1AddJL+jZ7KSqvBuliN4xqYY54IfdN8qD8Toa6g1iloph1fxQNkjOxrrpQ==",
+      "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
         "@types/json-schema": "^7.0.15"
@@ -1364,6 +1366,7 @@
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-3.3.3.tgz",
       "integrity": "sha512-Kr+LPIUVKz2qkx1HAMH8q1q6azbqBAsXJUxBl/ODDuVPX45Z9DfwB8tPjTi6nNZ8BuM3nbJxC5zCAg5elnBUTQ==",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "ajv": "^6.12.4",
@@ -1387,6 +1390,7 @@
       "version": "6.14.0",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.14.0.tgz",
       "integrity": "sha512-IWrosm/yrn43eiKqkfkHis7QioDleaXQHdDVPKg0FSwwd/DuvyX79TZnFOnYpB7dcsFAMmtFztZuXPDvSePkFw==",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "fast-deep-equal": "^3.1.1",
@@ -1403,12 +1407,14 @@
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
       "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
+      "dev": true,
       "license": "MIT"
     },
     "node_modules/@eslint/js": {
       "version": "9.39.2",
       "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.39.2.tgz",
       "integrity": "sha512-q1mjIoW1VX4IvSocvM/vbTiveKC4k9eLrajNEuSsmjymSDEbpGddtpfOoN7YGAqBK3NG+uqo8ia4PDTt8buCYA==",
+      "dev": true,
       "license": "MIT",
       "engines": {
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
@@ -1421,6 +1427,7 @@
       "version": "2.1.7",
       "resolved": "https://registry.npmjs.org/@eslint/object-schema/-/object-schema-2.1.7.tgz",
       "integrity": "sha512-VtAOaymWVfZcmZbp6E2mympDIHvyjXs/12LqWYjVw6qjrfF+VK+fyG33kChz3nnK+SU5/NeHOqrTEHS8sXO3OA==",
+      "dev": true,
       "license": "Apache-2.0",
       "engines": {
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
@@ -1430,6 +1437,7 @@
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/@eslint/plugin-kit/-/plugin-kit-0.4.1.tgz",
       "integrity": "sha512-43/qtrDUokr7LJqoF2c3+RInu/t4zfrpYdoSDfYyhg52rwLV6TnOvdG4fXm7IkSB3wErkcmJS9iEhjVtOSEjjA==",
+      "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
         "@eslint/core": "^0.17.0",
@@ -1443,6 +1451,7 @@
       "version": "0.19.1",
       "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.1.tgz",
       "integrity": "sha512-5DyQ4+1JEUzejeK1JGICcideyfUbGixgS9jNgex5nqkW+cY7WZhxBigmieN5Qnw9ZosSNVC9KQKyb+GUaGyKUA==",
+      "dev": true,
       "license": "Apache-2.0",
       "engines": {
         "node": ">=18.18.0"
@@ -1452,6 +1461,7 @@
       "version": "0.16.7",
       "resolved": "https://registry.npmjs.org/@humanfs/node/-/node-0.16.7.tgz",
       "integrity": "sha512-/zUx+yOsIrG4Y43Eh2peDeKCxlRt/gET6aHfaKpuq267qXdYDFViVHfMaLyygZOnl0kGWxFIgsBy8QFuTLUXEQ==",
+      "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
         "@humanfs/core": "^0.19.1",
@@ -1465,6 +1475,7 @@
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz",
       "integrity": "sha512-bxveV4V8v5Yb4ncFTT3rPSgZBOpCkjfK0y4oVVVJwIuDVBRMDXrPyXRL988i5ap9m9bnyEEjWfm5WkBmtffLfA==",
+      "dev": true,
       "license": "Apache-2.0",
       "engines": {
         "node": ">=12.22"
@@ -1478,6 +1489,7 @@
       "version": "0.4.3",
       "resolved": "https://registry.npmjs.org/@humanwhocodes/retry/-/retry-0.4.3.tgz",
       "integrity": "sha512-bV0Tgo9K4hfPCek+aMAn81RppFKv2ySDQeMoSZuvTASywNTnVJCArCZE2FWqpvIatKu7VMRLWlR1EazvVhDyhQ==",
+      "dev": true,
       "license": "Apache-2.0",
       "engines": {
         "node": ">=18.18"
@@ -2292,6 +2304,7 @@
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
       "integrity": "sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==",
+      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=6.0.0"
@@ -2312,6 +2325,7 @@
       "version": "1.5.5",
       "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
       "integrity": "sha512-cYQ9310grqxueWbl+WuIUIaiUaDcj7WOq5fVhEljNVgRfOUhY9fy2zTvfoqWsnebh8Sl70VScFbICvJnLKB0Og==",
+      "dev": true,
       "license": "MIT"
     },
     "node_modules/@jridgewell/trace-mapping": {
@@ -2656,8 +2670,7 @@
       "optional": true,
       "os": [
         "android"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-android-arm64": {
       "version": "4.59.0",
@@ -2671,8 +2684,7 @@
       "optional": true,
       "os": [
         "android"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-darwin-arm64": {
       "version": "4.59.0",
@@ -2686,8 +2698,7 @@
       "optional": true,
       "os": [
         "darwin"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-darwin-x64": {
       "version": "4.59.0",
@@ -2701,8 +2712,7 @@
       "optional": true,
       "os": [
         "darwin"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-freebsd-arm64": {
       "version": "4.59.0",
@@ -2716,8 +2726,7 @@
       "optional": true,
       "os": [
         "freebsd"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-freebsd-x64": {
       "version": "4.59.0",
@@ -2731,8 +2740,7 @@
       "optional": true,
       "os": [
         "freebsd"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-arm-gnueabihf": {
       "version": "4.59.0",
@@ -2749,8 +2757,7 @@
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-arm-musleabihf": {
       "version": "4.59.0",
@@ -2767,8 +2774,7 @@
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-arm64-gnu": {
       "version": "4.59.0",
@@ -2785,8 +2791,7 @@
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-arm64-musl": {
       "version": "4.59.0",
@@ -2803,8 +2808,7 @@
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-loong64-gnu": {
       "version": "4.59.0",
@@ -2821,8 +2825,7 @@
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-loong64-musl": {
       "version": "4.59.0",
@@ -2839,8 +2842,7 @@
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-ppc64-gnu": {
       "version": "4.59.0",
@@ -2857,8 +2859,7 @@
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-ppc64-musl": {
       "version": "4.59.0",
@@ -2875,8 +2876,7 @@
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-riscv64-gnu": {
       "version": "4.59.0",
@@ -2893,8 +2893,7 @@
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-riscv64-musl": {
       "version": "4.59.0",
@@ -2911,8 +2910,7 @@
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-s390x-gnu": {
       "version": "4.59.0",
@@ -2929,8 +2927,7 @@
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-x64-gnu": {
       "version": "4.59.0",
@@ -2947,8 +2944,7 @@
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-x64-musl": {
       "version": "4.59.0",
@@ -2965,8 +2961,7 @@
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       "license": "MIT",
       "engines": {
         "node": ">=6"
@@ -13757,6 +13840,7 @@
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
       "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=10"
@@ -13773,6 +13857,39 @@
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
+    },
+    "packages/client": {
+      "name": "@seamless-auth/client",
+      "version": "0.0.0",
+      "license": "AGPL-3.0-only",
+      "dependencies": {
+        "@seamless-auth/types": "^0.20.0",
+        "@simplewebauthn/browser": "^13.1.0"
+      },
+      "engines": {
+        "node": ">=24.0.0 <25.0.0",
+        "npm": ">=9.0.0 <13.0.0"
+      }
+    },
+    "packages/react": {
+      "name": "@seamless-auth/react",
+      "version": "0.12.0",
+      "license": "AGPL-3.0-only",
+      "dependencies": {
+        "@seamless-auth/client": "^0.0.0",
+        "@seamless-auth/types": "^0.20.0",
+        "@simplewebauthn/browser": "^13.1.0",
+        "libphonenumber-js": "^1.12.7"
+      },
+      "engines": {
+        "node": ">=24.0.0 <25.0.0",
+        "npm": ">=9.0.0 <13.0.0"
+      },
+      "peerDependencies": {
+        "react": "^18.0.0 || ^19.0.0",
+        "react-dom": "^18.0.0 || ^19.0.0",
+        "react-router-dom": "^6.4.0 || ^7.15.1"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 90797fc..5715c11 100644
--- a/package.json
+++ b/package.json
@@ -1,38 +1,29 @@
 {
-  "name": "@seamless-auth/react",
-  "version": "0.12.0",
-  "description": "A drop-in authentication solution for modern React applications.",
+  "name": "seamless-auth-client-sdks",
+  "private": true,
+  "description": "Seamless Auth client SDKs: the framework-agnostic client core and its React bindings.",
   "type": "module",
-  "exports": {
-    ".": {
-      "import": "./dist/index.js",
-      "types": "./dist/index.d.ts"
-    }
-  },
-  "types": "./dist/index.d.ts",
-  "files": [
-    "dist",
-    "README.md",
-    "CHANGELOG.md",
-    "LICENSE"
+  "workspaces": [
+    "packages/client",
+    "packages/react"
   ],
   "engines": {
     "node": ">=24.0.0 <25.0.0",
     "npm": ">=9.0.0 <13.0.0"
   },
   "scripts": {
-    "build": "node ./scripts/clean-dist.mjs && rollup -c && tsc-alias -p tsconfig.build.json",
+    "build": "npm run build -w @seamless-auth/client && npm run build -w @seamless-auth/react",
     "test": "jest",
     "coverage": "npm test -- --coverage",
-    "typecheck": "tsc --noEmit -p tsconfig.dev.json",
-    "lint": "eslint ./src ./tests",
+    "typecheck": "npm run typecheck -w @seamless-auth/client && npm run typecheck -w @seamless-auth/react",
+    "lint": "eslint ./packages",
     "format": "prettier --write .",
     "format:check": "prettier --check .",
     "prepare": "husky",
     "changeset": "changeset",
     "version-packages": "changeset version",
     "release:stable": "npm run build && changeset publish",
-    "check-npm-build": "npm pack --dry-run",
+    "check-npm-build": "npm pack --dry-run --workspaces",
     "lint-staged": "lint-staged"
   },
   "lint-staged": {
@@ -54,16 +45,6 @@
     "url": "https://github.com/fells-code/seamless-auth-react/issues"
   },
   "homepage": "https://github.com/fells-code/seamless-auth-react#readme",
-  "publishConfig": {
-    "access": "public",
-    "registry": "https://registry.npmjs.org/",
-    "provenance": true
-  },
-  "peerDependencies": {
-    "react": "^18.0.0 || ^19.0.0",
-    "react-dom": "^18.0.0 || ^19.0.0",
-    "react-router-dom": "^6.4.0 || ^7.15.1"
-  },
   "devDependencies": {
     "@changesets/cli": "^2.31.0",
     "@commitlint/cli": "^20.1.0",
@@ -83,6 +64,7 @@
     "eslint": "^9.38.0",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-import": "^2.32.0",
+    "eslint-plugin-license-header": "^0.9.0",
     "eslint-plugin-react": "^7.37.5",
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-refresh": "^0.4.24",
@@ -93,20 +75,14 @@
     "jest-environment-jsdom": "^30.2.0",
     "lint-staged": "^16.2.5",
     "prettier": "^3.6.2",
+    "rollup": "^4.59.0",
     "rollup-plugin-peer-deps-external": "^2.2.4",
     "rollup-plugin-postcss": "^4.0.2",
     "ts-jest": "^29.4.5",
+    "ts-node": "^10.9.2",
     "tsc-alias": "^1.9.1",
     "tslib": "^2.7.0",
     "typescript": "^5.9.3",
     "typescript-eslint": "^8.46.1"
-  },
-  "dependencies": {
-    "@seamless-auth/types": "^0.20.0",
-    "@simplewebauthn/browser": "^13.1.0",
-    "eslint-plugin-license-header": "^0.9.0",
-    "libphonenumber-js": "^1.12.7",
-    "ts-node": "^10.9.2"
-  },
-  "sideEffects": false
+  }
 }
diff --git a/packages/client/CHANGELOG.md b/packages/client/CHANGELOG.md
new file mode 100644
index 0000000..1e85d34
--- /dev/null
+++ b/packages/client/CHANGELOG.md
@@ -0,0 +1 @@
+# @seamless-auth/client
diff --git a/packages/client/LICENSE b/packages/client/LICENSE
new file mode 100644
index 0000000..162676c
--- /dev/null
+++ b/packages/client/LICENSE
@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+Everyone is permitted to copy and distribute verbatim copies
+of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+to take away your freedom to share and change the works. By contrast,
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+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
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+free programs, and that you know you can do these things.
+
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+and/or modify the software.
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+
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+You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License. For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+11. Patents.
+
+A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based. The
+work thus licensed is called the contributor's "contributor version".
+
+A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version. For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement). To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients. "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License. You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+12. No Surrender of Others' Freedom.
+
+If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all. For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+13. Remote Network Interaction; Use with the GNU General Public License.
+
+Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
+interacting with it remotely through a computer network (if your version
+supports such interaction) an opportunity to receive the Corresponding
+Source of your version by providing access to the Corresponding Source
+from a network server at no charge, through some standard or customary
+means of facilitating copying of software. This Corresponding Source
+shall include the Corresponding Source for any work covered by version 3
+of the GNU General Public License that is incorporated pursuant to the
+following paragraph.
+
+Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work. The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+14. Revised Versions of this License.
+
+The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero General Public License from time to time. Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation. If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+Later license versions may give you additional or different
+permissions. However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+15. Disclaimer of Warranty.
+
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+16. Limitation of Liability.
+
+IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+17. Interpretation of Sections 15 and 16.
+
+If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source. For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code. There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
diff --git a/packages/client/README.md b/packages/client/README.md
new file mode 100644
index 0000000..cc2ec42
--- /dev/null
+++ b/packages/client/README.md
@@ -0,0 +1,46 @@
+# @seamless-auth/client
+
+The framework-agnostic core of the Seamless Auth client SDKs. It holds the
+headless auth client (`createSeamlessAuthClient`), the session store
+(`createAuthSession`), and the result and error types that every binding shares.
+`@seamless-auth/react` is a thin binding over this package, and it is the
+package a React Native or other non-React binding builds on.
+
+If you are building a React application, install
+[`@seamless-auth/react`](https://www.npmjs.com/package/@seamless-auth/react)
+instead; it depends on this package and re-exports what an application needs.
+
+## Install
+
+```bash
+npm install @seamless-auth/client
+```
+
+## What is here
+
+- `createSeamlessAuthClient({ apiHost })`: the request choreography for login,
+  registration, OTP, magic link, passkey, OAuth, step-up, TOTP, credential and
+  organization flows against a Seamless Auth server adapter mounted at `/auth`.
+  Every method returns a `SeamlessAuthResult<T>`.
+- `createAuthSession({ apiHost, storage?, detectPreviousSignIn? })`: the session
+  state machine (`getState`, `subscribe`, `actions`, `destroy`), designed to be
+  bound with `useSyncExternalStore` or an equivalent.
+- `SessionStoragePort` with browser and memory implementations.
+- `SeamlessAuthError`, `getWebAuthnErrorDetail`, `getOAuthErrorCode`,
+  `isUnauthenticated`, and the other error readers.
+- PRF helpers for passkey-derived secrets.
+- `hasScopedRole` / `roleGrantsAccess`, the same role matching the auth API and
+  server adapters apply.
+
+The wire types come from `@seamless-auth/types`; this package aliases them rather
+than redeclaring shapes.
+
+## Transport
+
+Today the client speaks the cookie contract: requests go to `${apiHost}/auth/*`
+with `credentials: 'include'` and the server adapter holds the tokens. A bearer
+transport for native clients is the next change to this package.
+
+## License
+
+AGPL-3.0-only. See [LICENSE](LICENSE).
diff --git a/packages/client/jest.config.ts b/packages/client/jest.config.ts
new file mode 100644
index 0000000..62cbf5b
--- /dev/null
+++ b/packages/client/jest.config.ts
@@ -0,0 +1,21 @@
+/*
+ * Copyright © 2026 Fells Code, LLC
+ * Licensed under the GNU Affero General Public License v3.0
+ * See LICENSE file in the project root for full license information
+ */
+
+export default {
+  displayName: 'client',
+  preset: 'ts-jest',
+  testEnvironment: 'jsdom',
+  rootDir: '.',
+  setupFilesAfterEnv: ['<rootDir>/../../jest.setup.ts'],
+  transform: {
+    '^.+\\.(t|j)sx?$': ['ts-jest', { useESM: true, tsconfig: '<rootDir>/tsconfig.json' }],
+  },
+  extensionsToTreatAsEsm: ['.ts', '.tsx'],
+  moduleNameMapper: {
+    '^@/(.*)$': '<rootDir>/src/$1',
+  },
+  testMatch: ['<rootDir>/tests/**/*.(test|spec).[tj]s?(x)'],
+};
diff --git a/packages/client/package.json b/packages/client/package.json
new file mode 100644
index 0000000..651f91a
--- /dev/null
+++ b/packages/client/package.json
@@ -0,0 +1,49 @@
+{
+  "name": "@seamless-auth/client",
+  "version": "0.0.0",
+  "description": "Framework-agnostic client core for Seamless Auth: the HTTP client, session store, and result types the framework bindings share.",
+  "type": "module",
+  "exports": {
+    ".": {
+      "import": "./dist/index.js",
+      "types": "./dist/index.d.ts"
+    }
+  },
+  "types": "./dist/index.d.ts",
+  "files": [
+    "dist",
+    "README.md",
+    "CHANGELOG.md",
+    "LICENSE"
+  ],
+  "engines": {
+    "node": ">=24.0.0 <25.0.0",
+    "npm": ">=9.0.0 <13.0.0"
+  },
+  "scripts": {
+    "build": "node ../../scripts/clean-dist.mjs && rollup -c && tsc-alias -p tsconfig.build.json",
+    "typecheck": "tsc --noEmit -p tsconfig.dev.json",
+    "check-npm-build": "npm pack --dry-run"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/fells-code/seamless-auth-react.git",
+    "directory": "packages/client"
+  },
+  "author": "Fells Code, LLC",
+  "license": "AGPL-3.0-only",
+  "bugs": {
+    "url": "https://github.com/fells-code/seamless-auth-react/issues"
+  },
+  "homepage": "https://github.com/fells-code/seamless-auth-react/tree/main/packages/client#readme",
+  "publishConfig": {
+    "access": "public",
+    "registry": "https://registry.npmjs.org/",
+    "provenance": true
+  },
+  "dependencies": {
+    "@seamless-auth/types": "^0.20.0",
+    "@simplewebauthn/browser": "^13.1.0"
+  },
+  "sideEffects": false
+}
diff --git a/packages/client/rollup.config.js b/packages/client/rollup.config.js
new file mode 100644
index 0000000..eb46e33
--- /dev/null
+++ b/packages/client/rollup.config.js
@@ -0,0 +1,31 @@
+import alias from '@rollup/plugin-alias';
+import commonjs from '@rollup/plugin-commonjs';
+import terser from '@rollup/plugin-terser';
+import typescript from '@rollup/plugin-typescript';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+export default [
+  {
+    input: 'src/index.ts',
+    output: {
+      file: 'dist/index.js',
+      format: 'esm',
+      sourcemap: true,
+    },
+    external: ['@simplewebauthn/browser'],
+    plugins: [
+      alias({
+        entries: [{ find: '@', replacement: path.resolve(__dirname, 'src') }],
+      }),
+      commonjs(),
+      typescript({
+        tsconfig: './tsconfig.build.json',
+      }),
+      terser(),
+    ],
+  },
+];
diff --git a/src/client/createSeamlessAuthClient.ts b/packages/client/src/client/createSeamlessAuthClient.ts
similarity index 100%
rename from src/client/createSeamlessAuthClient.ts
rename to packages/client/src/client/createSeamlessAuthClient.ts
diff --git a/src/client/errors.ts b/packages/client/src/client/errors.ts
similarity index 100%
rename from src/client/errors.ts
rename to packages/client/src/client/errors.ts
diff --git a/src/client/result.ts b/packages/client/src/client/result.ts
similarity index 100%
rename from src/client/result.ts
rename to packages/client/src/client/result.ts
diff --git a/src/client/webauthnPrf.ts b/packages/client/src/client/webauthnPrf.ts
similarity index 100%
rename from src/client/webauthnPrf.ts
rename to packages/client/src/client/webauthnPrf.ts
diff --git a/src/client/webauthnSupport.ts b/packages/client/src/client/webauthnSupport.ts
similarity index 100%
rename from src/client/webauthnSupport.ts
rename to packages/client/src/client/webauthnSupport.ts
diff --git a/src/fetchWithAuth.ts b/packages/client/src/fetchWithAuth.ts
similarity index 100%
rename from src/fetchWithAuth.ts
rename to packages/client/src/fetchWithAuth.ts
diff --git a/packages/client/src/index.ts b/packages/client/src/index.ts
new file mode 100644
index 0000000..2811583
--- /dev/null
+++ b/packages/client/src/index.ts
@@ -0,0 +1,16 @@
+/*
+ * Copyright © 2026 Fells Code, LLC
+ * Licensed under the GNU Affero General Public License v3.0
+ * See LICENSE file in the project root for full license information
+ */
+
+export * from './client/createSeamlessAuthClient';
+export * from './client/errors';
+export * from './client/result';
+export * from './client/webauthnPrf';
+export * from './client/webauthnSupport';
+export * from './fetchWithAuth';
+export * from './scopedRoles';
+export * from './session/createAuthSession';
+export * from './session/storage';
+export * from './types';
diff --git a/src/scopedRoles.ts b/packages/client/src/scopedRoles.ts
similarity index 100%
rename from src/scopedRoles.ts
rename to packages/client/src/scopedRoles.ts
diff --git a/src/session/createAuthSession.ts b/packages/client/src/session/createAuthSession.ts
similarity index 100%
rename from src/session/createAuthSession.ts
rename to packages/client/src/session/createAuthSession.ts
diff --git a/src/session/storage.ts b/packages/client/src/session/storage.ts
similarity index 100%
rename from src/session/storage.ts
rename to packages/client/src/session/storage.ts
diff --git a/src/types.ts b/packages/client/src/types.ts
similarity index 100%
rename from src/types.ts
rename to packages/client/src/types.ts
diff --git a/tests/authSession.test.ts b/packages/client/tests/authSession.test.ts
similarity index 100%
rename from tests/authSession.test.ts
rename to packages/client/tests/authSession.test.ts
diff --git a/tests/createSeamlessAuthClient.test.ts b/packages/client/tests/createSeamlessAuthClient.test.ts
similarity index 100%
rename from tests/createSeamlessAuthClient.test.ts
rename to packages/client/tests/createSeamlessAuthClient.test.ts
diff --git a/tests/errors.test.ts b/packages/client/tests/errors.test.ts
similarity index 100%
rename from tests/errors.test.ts
rename to packages/client/tests/errors.test.ts
diff --git a/tests/fetchWithAuth.test.tsx b/packages/client/tests/fetchWithAuth.test.tsx
similarity index 100%
rename from tests/fetchWithAuth.test.tsx
rename to packages/client/tests/fetchWithAuth.test.tsx
diff --git a/tests/result.test.ts b/packages/client/tests/result.test.ts
similarity index 100%
rename from tests/result.test.ts
rename to packages/client/tests/result.test.ts
diff --git a/tests/scopedRoles.test.ts b/packages/client/tests/scopedRoles.test.ts
similarity index 100%
rename from tests/scopedRoles.test.ts
rename to packages/client/tests/scopedRoles.test.ts
diff --git a/tests/sessionStorage.ssr.test.ts b/packages/client/tests/sessionStorage.ssr.test.ts
similarity index 100%
rename from tests/sessionStorage.ssr.test.ts
rename to packages/client/tests/sessionStorage.ssr.test.ts
diff --git a/tests/sessionStorage.test.ts b/packages/client/tests/sessionStorage.test.ts
similarity index 100%
rename from tests/sessionStorage.test.ts
rename to packages/client/tests/sessionStorage.test.ts
diff --git a/tests/webauthnPrf.test.ts b/packages/client/tests/webauthnPrf.test.ts
similarity index 100%
rename from tests/webauthnPrf.test.ts
rename to packages/client/tests/webauthnPrf.test.ts
diff --git a/tests/webauthnSupport.ssr.test.ts b/packages/client/tests/webauthnSupport.ssr.test.ts
similarity index 100%
rename from tests/webauthnSupport.ssr.test.ts
rename to packages/client/tests/webauthnSupport.ssr.test.ts
diff --git a/tests/webauthnSupport.test.ts b/packages/client/tests/webauthnSupport.test.ts
similarity index 100%
rename from tests/webauthnSupport.test.ts
rename to packages/client/tests/webauthnSupport.test.ts
diff --git a/tests/wireTypes.test.ts b/packages/client/tests/wireTypes.test.ts
similarity index 100%
rename from tests/wireTypes.test.ts
rename to packages/client/tests/wireTypes.test.ts
diff --git a/tsconfig.build.json b/packages/client/tsconfig.build.json
similarity index 100%
rename from tsconfig.build.json
rename to packages/client/tsconfig.build.json
diff --git a/packages/client/tsconfig.dev.json b/packages/client/tsconfig.dev.json
new file mode 100644
index 0000000..a6668d6
--- /dev/null
+++ b/packages/client/tsconfig.dev.json
@@ -0,0 +1,4 @@
+{
+  "extends": "./tsconfig.json",
+  "include": ["src", "tests", "../../jest.setup.ts"]
+}
diff --git a/packages/client/tsconfig.json b/packages/client/tsconfig.json
new file mode 100644
index 0000000..4bf6210
--- /dev/null
+++ b/packages/client/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "paths": {
+      "@/*": ["./src/*"]
+    }
+  }
+}
diff --git a/CHANGELOG.md b/packages/react/CHANGELOG.md
similarity index 100%
rename from CHANGELOG.md
rename to packages/react/CHANGELOG.md
diff --git a/packages/react/LICENSE b/packages/react/LICENSE
new file mode 100644
index 0000000..162676c
--- /dev/null
+++ b/packages/react/LICENSE
@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+Everyone is permitted to copy and distribute verbatim copies
+of this license document, but changing it is not allowed.
+
+                            Preamble
+
+The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works. By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate. Many developers of free software are heartened and
+encouraged by the resulting cooperation. However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community. It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server. Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals. This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing under
+this license.
+
+The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+0. Definitions.
+
+"This License" refers to version 3 of the GNU Affero General Public License.
+
+"Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+"The Program" refers to any copyrightable work licensed under this
+License. Each licensee is addressed as "you". "Licensees" and
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+17. Interpretation of Sections 15 and 16.
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+If the disclaimer of warranty and limitation of liability provided
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+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+
+    <one line to give the program's name and a brief idea of what it does.>
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+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
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+interface could display a "Source" link that leads users to an archive
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+
+You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
diff --git a/packages/react/README.md b/packages/react/README.md
new file mode 100644
index 0000000..2a06f95
--- /dev/null
+++ b/packages/react/README.md
@@ -0,0 +1,1125 @@
+# @seamless-auth/react
+
+[![npm version](https://img.shields.io/npm/v/@seamless-auth/react.svg?label=%40seamless-auth%2Freact)](https://www.npmjs.com/package/@seamless-auth/react)
+[![CI](https://github.com/fells-code/seamless-auth-react/actions/workflows/ci.yml/badge.svg)](https://github.com/fells-code/seamless-auth-react/actions/workflows/ci.yml)
+[![Release](https://github.com/fells-code/seamless-auth-react/actions/workflows/release.yml/badge.svg)](https://github.com/fells-code/seamless-auth-react/actions/workflows/release.yml)
+[![coverage](https://img.shields.io/codecov/c/github/fells-code/seamless-auth-react)](https://app.codecov.io/gh/fells-code/seamless-auth-react)
+[![license](https://img.shields.io/github/license/fells-code/seamless-auth-react)](./LICENSE)
+
+`@seamless-auth/react` is a React SDK for Seamless Auth. It gives you a provider for auth state, a headless client and hooks for custom auth UIs, and optional prebuilt auth routes when you want a faster drop-in flow.
+
+## What It Exports
+
+- `AuthProvider`
+- `AuthRoutes`
+- `useAuth()`
+- `createSeamlessAuthClient()`
+- `useAuthClient()`
+- `usePasskeySupport()`
+- `hasScopedRole()` and `roleGrantsAccess()`
+- `SeamlessAuthError`, the error type carried on a failed result
+- `getOAuthErrorCode()`, which reads the known OAuth callback failure codes off that error
+- `getWebAuthnErrorDetail()`, which reads the underlying failure of a passkey or step-up ceremony
+- `getPasskeyPolicyErrorCode()`, which reads the code the API refused a passkey registration with
+- types including `AuthContextType`, `Credential`, `User`, `OAuthProvider`, `StepUpStatus`, the `SeamlessAuthResult` wrapper, and the headless client input/result types
+
+## Installation
+
+```bash
+npm install @seamless-auth/react
+```
+
+## Releases
+
+Published versions are listed in [CHANGELOG.md](./CHANGELOG.md) and GitHub Releases. Releases are
+managed with Changesets: adopter-facing changes include a changeset, the `Release` workflow opens a
+version PR for review, and merging that PR publishes the npm package with provenance from GitHub
+Actions. See [RELEASES.md](./RELEASES.md) for maintainer release details.
+
+## Choose Your Integration Style
+
+You can use this package in three ways:
+
+1. `AuthProvider` + `useAuth()` for auth state and core auth actions
+2. `createSeamlessAuthClient()` or `useAuthClient()` to build fully custom login and registration screens
+3. `AuthRoutes` when you want the built-in login, OTP, magic-link, and passkey screens
+
+Most apps will use `AuthProvider` either way.
+
+## Quick Start
+
+### Wrap your app with `AuthProvider`
+
+```tsx
+import { AuthProvider } from '@seamless-auth/react';
+import { BrowserRouter } from 'react-router-dom';
+
+<BrowserRouter>
+  <AuthProvider apiHost="https://your.api">
+    <AppRoutes />
+  </AuthProvider>
+</BrowserRouter>;
+```
+
+### Read auth state with `useAuth()`
+
+```tsx
+import { useAuth } from '@seamless-auth/react';
+
+function Dashboard() {
+  const { user, logout, refreshSession } = useAuth();
+
+  return (
+    <div>
+      <p>Welcome, {user?.email}</p>
+      <button onClick={() => void refreshSession()}>Refresh session</button>
+      <button onClick={() => void logout()}>Logout</button>
+    </div>
+  );
+}
+```
+
+### Use built-in auth routes with `AuthRoutes`
+
+```tsx
+import { AuthRoutes, useAuth } from '@seamless-auth/react';
+import { Route, Routes } from 'react-router-dom';
+
+function AppRoutes() {
+  const { isAuthenticated } = useAuth();
+
+  return (
+    <Routes>
+      {isAuthenticated ? (
+        <Route path="*" element={<Dashboard />} />
+      ) : (
+        <Route path="*" element={<AuthRoutes />} />
+      )}
+    </Routes>
+  );
+}
+```
+
+You are still responsible for your app’s route protection and redirects.
+
+## `useAuth()` API
+
+`useAuth()` returns the current auth state plus the provider-backed helpers:
+
+```ts
+{
+  user: User | null;
+  credentials: Credential[];
+  stepUpStatus: StepUpStatus | null;
+  isAuthenticated: boolean;
+  loading: boolean;
+  apiHost: string;
+  hasSignedInBefore: boolean;
+  markSignedIn(): void;
+  hasRole(role: string): boolean | undefined;
+  hasScopedRole(role: string | string[]): boolean | undefined;
+  listOAuthProviders(): Promise<SeamlessAuthResult<OAuthProvidersResult>>;
+  startOAuthLogin(input: StartOAuthLoginInput): Promise<SeamlessAuthResult<StartOAuthLoginResult>>;
+  finishOAuthLogin(input: FinishOAuthLoginInput): Promise<SeamlessAuthResult<MessageResult>>;
+  refreshSession(): Promise<SeamlessAuthResult<CurrentUserResult>>;
+  refreshStepUpStatus(): Promise<SeamlessAuthResult<StepUpStatus>>;
+  verifyStepUpWithPasskey(): Promise<SeamlessAuthResult<StepUpStatus>>;
+  verifyStepUpWithPasskeyPrf(input: PasskeyPrfInput): Promise<SeamlessAuthResult<StepUpPrfData>>;
+  verifyStepUpWithTotp(code: string): Promise<SeamlessAuthResult<StepUpStatus>>;
+  logout(): Promise<SeamlessAuthResult<MessageResult>>;
+  logoutAllSessions(): Promise<SeamlessAuthResult<MessageResult>>;
+  deleteUser(): Promise<SeamlessAuthResult<MessageResult>>;
+  login(identifier: string, passkeyAvailable: boolean): Promise<SeamlessAuthResult<LoginStartResult>>;
+  handlePasskeyLogin(): Promise<SeamlessAuthResult<PasskeyLoginData>>;
+  updateCredential(credential: Credential): Promise<SeamlessAuthResult<Credential>>;
+  deleteCredential(credentialId: string): Promise<SeamlessAuthResult<MessageResult>>;
+}
+```
+
+Use `refreshSession()` after completing a custom auth flow that should update provider state.
+
+### `hasSignedInBefore`
+
+`hasSignedInBefore` is a small convenience flag backed by `localStorage`. The provider reads the `seamlessauth_seen` key on load and sets the flag to `true` after `markSignedIn()` runs.
+
+This is mainly useful for login UIs that want to branch between first-time and returning-user behavior. For example, the built-in `Login` view uses it to default returning users to sign-in mode instead of registration.
+
+```tsx
+import { useAuth } from '@seamless-auth/react';
+
+function SignInHint() {
+  const { hasSignedInBefore } = useAuth();
+
+  return hasSignedInBefore ? (
+    <p>Welcome back. Sign in with your email, phone, or passkey.</p>
+  ) : (
+    <p>New here? Start by creating your account.</p>
+  );
+}
+```
+
+If you are building a fully custom flow, call `markSignedIn()` after a successful sign-in or registration step once you want future visits treated as returning-user sessions.
+
+```tsx
+const { markSignedIn, refreshSession } = useAuth();
+
+async function completeLogin() {
+  const { error } = await authClient.login({
+    identifier: 'user@example.com',
+    passkeyAvailable: true,
+  });
+
+  if (!error) {
+    markSignedIn();
+    await refreshSession();
+  }
+}
+```
+
+To disable this auto-detection entirely, pass `autoDetectPreviousSignin={false}` to `AuthProvider`.
+
+### Magic link destination
+
+By default a magic link lands wherever the deployment is configured to send it. A deployment serving
+more than one front end can override that per application with `magicLinkRedirectUri`:
+
+```tsx
+<AuthProvider apiHost={apiHost} magicLinkRedirectUri="https://app.example.com/auth/magic">
+  <AuthRoutes />
+</AuthProvider>
+```
+
+Every magic link the bundled screens send uses it, including the resend on the "check your email"
+screen, so a resent link always lands where the first one did. The deployment validates the value
+against its configured origins and refuses anything else, which comes back as an ordinary error
+result.
+
+Custom UIs get the same default through `useAuthClient()`, and can still override a single send with
+`requestMagicLink(uri)`.
+
+### Scoped roles
+
+`hasRole(role)` remains an exact role check. Use `hasScopedRole(role)` for colon-separated scoped
+roles such as `admin:read` and `admin:write`.
+
+```tsx
+const { hasRole, hasScopedRole } = useAuth();
+
+hasRole('admin'); // exact legacy role check
+hasScopedRole('admin:read'); // true for admin, admin:read, or admin:write
+hasScopedRole('admin:write'); // true for admin or admin:write
+```
+
+The package also exports standalone `hasScopedRole(roles, required)` and `roleGrantsAccess(...)`
+helpers for code that is not inside `AuthProvider`.
+
+### Step-up authentication
+
+Use step-up authentication before sensitive actions that should require a fresh user verification, such as deleting an account, changing MFA settings, or viewing recovery material.
+
+```tsx
+import { useAuth } from '@seamless-auth/react';
+
+function DeleteAccountButton() {
+  const { refreshStepUpStatus, verifyStepUpWithPasskey } = useAuth();
+
+  async function handleDeleteAccount() {
+    const { data: status } = await refreshStepUpStatus();
+    const fresh = status?.fresh ? true : !(await verifyStepUpWithPasskey()).error;
+
+    if (!fresh) {
+      return;
+    }
+
+    await deleteAccount();
+  }
+
+  return <button onClick={() => void handleDeleteAccount()}>Delete account</button>;
+}
+```
+
+Step-up supports WebAuthn/passkeys and TOTP (authenticator apps). `refreshStepUpStatus()` calls `/step-up/status`, `verifyStepUpWithPasskey()` performs the `/step-up/webauthn/start` and `/step-up/webauthn/finish` challenge flow, and `verifyStepUpWithTotp(code)` verifies a 6-digit authenticator code via `/totp/verify-mfa`. The verification helpers return a `SeamlessAuthResult<StepUpStatus>` and refresh the provider's `stepUpStatus` when they succeed.
+
+```tsx
+const { verifyStepUpWithTotp } = useAuth();
+
+const { error } = await verifyStepUpWithTotp('123456'); // 6-digit code from the authenticator app
+if (!error) {
+  // step-up is fresh; proceed with the sensitive action
+}
+```
+
+### TOTP (authenticator apps)
+
+TOTP lets users register an authenticator app (Google Authenticator, 1Password, etc.) as a second factor for step-up verification. The SDK exposes headless client methods for enrollment and management; use them from a settings screen. All require an authenticated session.
+
+```ts
+import { createSeamlessAuthClient } from '@seamless-auth/react';
+import type { TotpStatus, TotpEnrollmentStartResult } from '@seamless-auth/react';
+
+const authClient = createSeamlessAuthClient({ apiHost: 'https://your.api' });
+
+// 1. Check whether TOTP is already enabled
+const { data: status } = await authClient.getTotpStatus();
+
+// 2. Start enrollment: render `otpauthUrl` as a QR code (or show `secret` for manual entry)
+const { data: enrollment } = await authClient.startTotpEnrollment();
+
+// 3. Confirm the first code from the user's authenticator app
+const { error } = await authClient.verifyTotpEnrollment('123456');
+if (!error) {
+  // TOTP is now enabled
+}
+
+// Disabling requires a current code
+await authClient.disableTotp('123456');
+```
+
+These methods follow the standard result convention: check `error`, then read `data`. Enrolling TOTP is a sensitive change; gate it behind a fresh step-up when appropriate.
+
+> TOTP is not currently a login second factor. The Seamless Auth API issues a full session on the first factor and does not gate login on TOTP, so TOTP applies to step-up verification, not to the login flow.
+
+### WebAuthn PRF
+
+WebAuthn PRF lets a compatible passkey and browser derive local key material during a WebAuthn assertion. Seamless Auth verifies the passkey assertion on the server, while the React SDK returns the PRF output only to the browser caller. PRF output is stripped before `/webAuthn/login/finish` and `/step-up/webauthn/finish`, and should never be logged, stored, or sent to your API.
+
+Browser and authenticator support is not universal. Call `isPasskeyPrfSupported()` before offering PRF-required flows, and keep a fallback for passkeys that authenticate successfully without returning PRF output.
+
+Treat PRF salts as sensitive in client logs. PRF output is browser-local key material; keep it in
+memory only as long as your application needs it and do not send it to Seamless Auth or your own API.
+
+```ts
+import { createSeamlessAuthClient } from '@seamless-auth/react';
+
+const authClient = createSeamlessAuthClient({
+  apiHost: 'https://your.api',
+});
+
+const prfSupported = await authClient.isPasskeyPrfSupported();
+
+if (prfSupported) {
+  await authClient.registerPasskey({
+    metadata: {
+      friendlyName: 'My laptop',
+      platform: 'macOS',
+      browser: 'Chrome',
+      deviceInfo: navigator.userAgent,
+    },
+    requirePrf: true,
+  });
+}
+```
+
+For local key unwrap flows such as Seamless Secrets, use PRF during step-up and consume the returned bytes in browser memory:
+
+```ts
+const { data, error } = await authClient.verifyStepUpWithPasskeyPrf({
+  salt: vaultSaltBase64url,
+  credentialId,
+});
+
+if (error) {
+  throw error;
+}
+
+const vaultUnlockMaterial: { credentialId: string; output: Uint8Array } = {
+  credentialId: data.credentialId,
+  output: data.prf.output,
+};
+```
+
+The salt may be an `ArrayBuffer`, `ArrayBufferView`, or base64url string. Authentication proves identity and user presence; the PRF output is local key material for your application to use without sending it to Seamless Auth.
+
+### OAuth Login
+
+OAuth lets your app offer external identity providers such as Google, GitHub, Facebook, or custom
+OIDC-style providers configured on the Seamless Auth API. The React SDK does not receive provider
+access tokens. It only starts the provider redirect and completes the callback so Seamless Auth can
+issue the normal access/refresh session.
+
+Use `listOAuthProviders()` when you want to render enabled providers dynamically:
+
+```tsx
+import { useEffect, useState } from 'react';
+import { useAuth } from '@seamless-auth/react';
+import type { OAuthProvider } from '@seamless-auth/react';
+
+function OAuthButtons() {
+  const { listOAuthProviders, startOAuthLogin } = useAuth();
+  const [providers, setProviders] = useState<OAuthProvider[]>([]);
+
+  useEffect(() => {
+    void listOAuthProviders().then(result => setProviders(result.providers));
+  }, [listOAuthProviders]);
+
+  async function signIn(providerId: string) {
+    const result = await startOAuthLogin({
+      providerId,
+      redirectUri: `${window.location.origin}/oauth/callback`,
+      returnTo: `${window.location.origin}/dashboard`,
+    });
+
+    window.location.assign(result.authorizationUrl);
+  }
+
+  return (
+    <div>
+      {providers.map(provider => (
+        <button key={provider.id} onClick={() => void signIn(provider.id)}>
+          Continue with {provider.name}
+        </button>
+      ))}
+    </div>
+  );
+}
+```
+
+Create a callback route that reads the provider query params and asks Seamless Auth to complete the
+login:
+
+```tsx
+import { useEffect } from 'react';
+import { useAuth } from '@seamless-auth/react';
+
+function OAuthCallback() {
+  const { finishOAuthLogin } = useAuth();
+
+  useEffect(() => {
+    const params = new URLSearchParams(window.location.search);
+    // Persist the provider you passed to startOAuthLogin so the callback knows
+    // which provider to finish. The built-in AuthRoutes flow stores this in
+    // sessionStorage; use whatever your custom start flow saved.
+    const providerId = sessionStorage.getItem('seamless:oauth:provider');
+    const code = params.get('code');
+    const state = params.get('state');
+
+    if (!providerId || !code || !state) {
+      return;
+    }
+
+    void finishOAuthLogin({ providerId, code, state }).then(() => {
+      window.location.assign('/dashboard');
+    });
+  }, [finishOAuthLogin]);
+
+  return <p>Finishing sign-in...</p>;
+}
+```
+
+Some callback failures are the user's to fix, so the API returns a stable `code` alongside the error
+message. `getOAuthErrorCode()` narrows it to the codes this SDK knows about and returns `undefined`
+for everything else, so unexpected failures keep your generic message:
+
+```tsx
+import { getOAuthErrorCode, useAuth } from '@seamless-auth/react';
+
+const { error } = await finishOAuthLogin({ providerId, code, state });
+
+switch (getOAuthErrorCode(error)) {
+  case 'oauth_missing_email':
+    // The provider account shared no email address.
+    break;
+  case 'oauth_email_not_verified':
+    // The provider account's email is unverified.
+    break;
+  case 'oauth_missing_subject':
+    // The provider returned no usable account identifier.
+    break;
+  default:
+    // No error, or one without a recognized code.
+    break;
+}
+```
+
+The bundled `AuthRoutes` callback screen already maps these three codes to actionable text.
+
+For fully custom UI without `useAuth()`, call the headless client directly:
+
+```ts
+const providers = await authClient.listOAuthProviders();
+const started = await authClient.startOAuthLogin({
+  providerId: providers.providers[0].id,
+  redirectUri: `${window.location.origin}/oauth/callback`,
+});
+
+window.location.assign(started.authorizationUrl);
+```
+
+OAuth must be enabled on the Seamless Auth API with `LOGIN_METHODS` including `oauth` and at least
+one configured `oauth_providers` entry. Provider client secrets live on the server and are referenced
+by environment variable name; they are never passed through this SDK.
+
+For production providers, configure exact `redirectUris` on the Seamless Auth API. The SDK should
+send the callback URL it expects to receive, but redirect allowlisting, signed state expiry, OIDC
+nonce handling, email verification policy, and account-linking policy are enforced by the API.
+
+The built-in views avoid logging OTPs, magic-link tokens, PRF salts, or raw
+exception payloads that may contain sensitive request URLs.
+
+## Headless Client
+
+For custom auth UIs, use the exported client directly:
+
+```ts
+import { createSeamlessAuthClient } from '@seamless-auth/react';
+
+const authClient = createSeamlessAuthClient({
+  apiHost: 'https://your.api',
+});
+
+const { data, error } = await authClient.login({
+  identifier: 'user@example.com',
+  passkeyAvailable: true,
+});
+
+if (error) {
+  // error.message, error.status, and error.body carry the server detail
+  return;
+}
+
+// data is typed as LoginStartResult
+console.log(data.loginMethods);
+```
+
+The headless client exposes helpers for:
+
+- current-user/session lookup
+- login and passkey login
+- registration
+- phone OTP and email OTP
+- magic-link request, verify, and polling
+- OAuth provider listing, start, and callback completion
+- passkey registration
+- step-up status, passkey verification, and TOTP verification
+- TOTP enrollment, status, and disable
+- logout and delete-user
+- credential update and deletion
+
+### Where the response types come from
+
+The request and response types are aliases of
+[`@seamless-auth/types`](https://www.npmjs.com/package/@seamless-auth/types), which is generated from
+the auth API's schemas. `User`, `Credential`, `Organization`, `StepUpStatus`, `MessageResult`, and the
+other wire shapes describe what the API actually sends, rather than a second copy maintained here that
+could drift from it.
+
+The dependency is types-only. Nothing from it is imported at runtime, so no schema validation library
+reaches your bundle. Names exported from this package stay the SDK's own, so you keep importing
+`Credential` from `@seamless-auth/react`.
+
+Two SDK concerns are deliberately not shared, because they are not wire contracts: the PRF helper
+types and the `SeamlessAuthResult` wrapper.
+
+### Result convention
+
+Every request method resolves to a `SeamlessAuthResult<T>`:
+
+```ts
+type SeamlessAuthResult<T> =
+  | { data: T; error: null }
+  | { data: null; error: SeamlessAuthError };
+```
+
+Check `error` first, then read `data`. TypeScript enforces this: `data` is not readable until the
+error has been ruled out.
+
+```ts
+const { data, error } = await authClient.getCurrentUser();
+
+if (error) {
+  console.log(error.message, error.status, error.body);
+  return;
+}
+
+setUser(data.user); // typed as CurrentUserResult
+```
+
+Nothing throws for an HTTP failure, and transport failures are absorbed too, reported as an error
+with `status` `0`. That means an expected auth outcome such as a wrong OTP, an expired magic link, or
+a disabled provider is a value you can map straight to UI state rather than an exception to catch.
+
+`SeamlessAuthError` carries the server's `message`, the HTTP `status`, and the parsed response
+`body`, so you can branch on a specific failure.
+
+### WebAuthn ceremony failures
+
+A passkey or step-up ceremony can fail in the browser before any request is sent, so those results
+carry the thrown error as `cause` with `status` `0`. Use `getWebAuthnErrorDetail()` to read it: the
+`name` is the `DOMException` name that separates the cases a user can act on, and `code` is
+SimpleWebAuthn's narrower reason when it identified one.
+
+```ts
+import { getWebAuthnErrorDetail } from '@seamless-auth/react';
+
+const { error } = await authClient.verifyStepUpWithPasskey();
+const detail = getWebAuthnErrorDetail(error);
+
+switch (detail?.name) {
+  case 'NotAllowedError':
+    // The prompt was dismissed, or the account has no passkey to assert.
+    break;
+  case 'SecurityError':
+    // The origin or RP ID does not match what the API is configured for.
+    break;
+  case 'InvalidStateError':
+    // This authenticator already holds a passkey for the account.
+    break;
+  default:
+    // Not a ceremony failure. Fall back to error?.message.
+    break;
+}
+```
+
+`getWebAuthnErrorDetail()` returns `undefined` for any error that did not come from a ceremony, so an
+HTTP failure keeps flowing through `error.message` and `error.body` as usual.
+
+### Choosing the authenticator
+
+By default the browser offers every kind of authenticator the deployment enrols, which is what
+`authenticator_policy.attachment: 'any'` means on the API. Pass `attachment` to narrow the picker to
+one kind, for example to send someone straight to an issued security key rather than leaving them to
+find it in a browser dialog:
+
+```ts
+import { getPasskeyPolicyErrorCode } from '@seamless-auth/react';
+
+const { error } = await authClient.registerPasskey({
+  metadata,
+  attachment: 'cross-platform',
+});
+
+if (getPasskeyPolicyErrorCode(error) === 'attachment_not_allowed') {
+  // This deployment pins the other kind. Fall back to the default path.
+}
+```
+
+`'cross-platform'` is a roaming authenticator such as a USB or NFC security key. `'platform'` is the
+one built into the device, such as Touch ID or Windows Hello. Omit the option to leave the choice to
+the deployment.
+
+This is a request, not an override. A deployment that has pinned
+`authenticator_policy.attachment` to the other kind refuses the registration with
+`attachment_not_allowed`, covered below. The bundled enrolment view offers a "Use a security key
+instead" control that takes this path.
+
+### Passkey policy refusals
+
+A registration can also be refused by the policy the API is configured with. `registerPasskey()`
+then fails with a body whose `error` is a stable code rather than a sentence, so rendering
+`error.message` would put that code in front of a user. Use `getPasskeyPolicyErrorCode()` to branch
+on it:
+
+```ts
+import { getPasskeyPolicyErrorCode } from '@seamless-auth/react';
+
+const { error } = await authClient.registerPasskey({ metadata });
+
+switch (getPasskeyPolicyErrorCode(error)) {
+  case 'attachment_not_allowed':
+    // The requested `attachment` is not the kind this deployment enrols.
+    break;
+  case 'synced_passkey_not_allowed':
+    // This passkey syncs to iCloud Keychain or Google Password Manager, and
+    // this deployment requires a device-bound one such as a security key.
+    break;
+  case 'authenticator_not_allowed':
+    // This authenticator model is not permitted here.
+    break;
+  case 'prf_required':
+    // Registration asked for PRF and the authenticator does not support it.
+    break;
+  default:
+    // No error, or one without a recognized code. Fall back to error?.message.
+    break;
+}
+```
+
+| Code                         | Stage           | Status | When the API sends it                                                                        |
+| ---------------------------- | --------------- | ------ | -------------------------------------------------------------------------------------------- |
+| `attachment_not_allowed`     | register/start  | 400    | the requested `attachment` is not the kind `authenticator_policy.attachment` pins            |
+| `synced_passkey_not_allowed` | register/finish | 403    | `authenticator_policy.syncedPasskeys` is `block` and the credential is backup eligible       |
+| `authenticator_not_allowed`  | register/finish | 403    | the credential's AAGUID is on `aaguidDenyList`, or absent from a non-empty `aaguidAllowList` |
+| `prf_required`               | register/finish | 403    | registration required PRF and the credential did not report support for it                   |
+
+`attachment_not_allowed` is refused before any ceremony runs, so the browser never prompts. The rest
+are refused after a credential exists and can be inspected.
+
+`syncedPasskeys` defaults to `allow` on the Seamless Auth API, so a default deployment enrols the
+passkeys iCloud Keychain and Google Password Manager create. A deployment that issues its own
+authenticators can set `authenticator_policy.syncedPasskeys` to `block` in the API's system config,
+and every backup-eligible passkey is then refused at registration. Handle the code: the SDK cannot
+tell from the client which way the API is configured.
+
+Like `getOAuthErrorCode()`, this returns `undefined` for anything it does not recognize, including
+codes added by a newer API, so an unexpected refusal keeps your generic messaging.
+
+The single exception is `isPasskeySupported`-style capability checks:
+`isPasskeyPrfSupported(): Promise<boolean>` is a local check rather than a request, so it returns a
+plain boolean.
+
+## React Hooks For Custom UI
+
+If you want custom React screens but do not want to manually recreate the client, use the exported hooks:
+
+```tsx
+import { useAuth, useAuthClient, usePasskeySupport } from '@seamless-auth/react';
+
+function CustomLogin() {
+  const { refreshSession } = useAuth();
+  const authClient = useAuthClient();
+  const { passkeySupported, loading } = usePasskeySupport();
+
+  async function handleEmailLogin() {
+    const { error } = await authClient.login({
+      identifier: 'user@example.com',
+      passkeyAvailable: passkeySupported,
+    });
+
+    if (!error) {
+      await refreshSession();
+    }
+  }
+
+  return (
+    <button disabled={loading} onClick={() => void handleEmailLogin()}>
+      Sign in
+    </button>
+  );
+}
+```
+
+### One error style everywhere
+
+`useAuth()` helpers and the headless client report failure the same way: both return
+`{ data, error }` and neither throws. Whatever surface you reach for, the handling is identical.
+
+```tsx
+const { error } = await updateCredential({ ...credential, friendlyName: 'Work laptop' });
+
+if (error) {
+  setMessage(error.message);
+}
+```
+
+Helpers that also mutate provider state, such as `switchOrganization` and `deleteCredential`, apply
+that state change only when the call succeeds, then hand the result back for you to inspect.
+
+## Custom UI Recipes
+
+Worked examples for the flows the bundled screens cover, using only public primitives.
+
+### Custom registration
+
+Registration is two steps: create the account, then verify the emailed code. Call `markSignedIn()`
+once the account is live so returning visits can default to sign-in.
+
+```tsx
+import { useAuth, useAuthClient } from '@seamless-auth/react';
+import { useState } from 'react';
+
+function CustomRegistration() {
+  const { markSignedIn, refreshSession } = useAuth();
+  const authClient = useAuthClient();
+  const [step, setStep] = useState<'details' | 'verify'>('details');
+  const [message, setMessage] = useState('');
+
+  async function createAccount(email: string) {
+    // Registration needs only an email. A phone can be added and verified later.
+    const { error } = await authClient.register({ email });
+
+    if (error) {
+      setMessage(error.message);
+      return;
+    }
+
+    // The API emails a verification code as part of registering.
+    setStep('verify');
+  }
+
+  async function verifyCode(code: string) {
+    const { error } = await authClient.verifyEmailOtp(code);
+
+    if (error) {
+      setMessage(error.message);
+      return;
+    }
+
+    markSignedIn();
+    await refreshSession();
+  }
+
+  return step === 'details' ? (
+    <DetailsForm onSubmit={createAccount} error={message} />
+  ) : (
+    <CodeForm
+      onSubmit={verifyCode}
+      onResend={() => authClient.requestEmailOtp()}
+      error={message}
+    />
+  );
+}
+```
+
+Enrolment takes the signed-in session, so it comes after the step that establishes one.
+Verifying the email OTP signs the user in, which is why the bundled flow offers a passkey
+on the screen after it rather than before.
+
+To offer a passkey right after registering, call `registerPasskey()` before `refreshSession()`:
+
+```ts
+const { data, error } = await authClient.registerPasskey({
+  friendlyName: 'My laptop',
+  platform: 'macOS',
+  browser: 'Chrome',
+  deviceInfo: navigator.userAgent,
+});
+
+if (!error) {
+  console.log(data.credentialId, data.prfCapable);
+}
+```
+
+### Adding a passkey from a settings screen
+
+The same call adds a passkey to an account that already has one, or gives one to a user
+who declined at signup. Use it from `useAuth()` rather than the client directly: that
+version refreshes the session afterwards, so `credentials` includes the new passkey
+without a reload.
+
+```tsx
+function AddPasskey() {
+  const { registerPasskey, credentials } = useAuth();
+
+  const add = async () => {
+    const { error } = await registerPasskey({
+      friendlyName: 'My laptop',
+      platform: 'macOS',
+      browser: 'Chrome',
+      deviceInfo: navigator.userAgent,
+    });
+
+    if (error) {
+      // A 401 means the session expired rather than anything about the
+      // authenticator. `isUnauthenticated(error)` tells the two apart.
+    }
+  };
+
+  return (
+    <>
+      <p>{credentials.length} passkeys</p>
+      <button onClick={add}>Add a passkey</button>
+    </>
+  );
+}
+```
+
+### OTP and magic-link continuation
+
+> **The request helpers take no identifier.** `requestMagicLink()`, `requestLoginEmailOtp()`, and
+> `requestLoginPhoneOtp()` send nothing but the session cookie. They rely on server-side state
+> established by a preceding `login()` call, so calling them without it fails or targets the wrong
+> account. This is not obvious from their signatures. Always call `login()` first, and use the same
+> browser session for the continuation step.
+
+```tsx
+function CustomLoginContinuation() {
+  const { login, refreshSession } = useAuth();
+  const authClient = useAuthClient();
+
+  async function start(identifier: string) {
+    // Required first: this is what the request helpers below depend on.
+    const { data, error } = await login(identifier, false);
+
+    if (error) {
+      return;
+    }
+
+    // Offer only what the server says this account supports.
+    return data.loginMethods ?? ['magic_link', 'email_otp'];
+  }
+
+  async function sendEmailCode() {
+    const { error } = await authClient.requestLoginEmailOtp();
+    if (error) {
+      // surface error.message
+    }
+  }
+
+  async function submitEmailCode(code: string) {
+    const { error } = await authClient.verifyLoginEmailOtp(code);
+
+    if (!error) {
+      await refreshSession();
+    }
+  }
+}
+```
+
+Magic links complete in whichever tab opens the emailed link, so a custom flow needs two pieces.
+
+The waiting screen polls until the link is used:
+
+```ts
+const interval = setInterval(async () => {
+  const { error } = await authClient.checkMagicLink();
+
+  if (!error) {
+    clearInterval(interval);
+    await refreshSession();
+  }
+}, 5000);
+```
+
+The landing route verifies the token from the query string, then refreshes its own session:
+
+```tsx
+function CustomMagicLinkLanding() {
+  const { refreshSession } = useAuth(); // plus: import { useEffect } from 'react'
+  const authClient = useAuthClient();
+
+  useEffect(() => {
+    const token = new URLSearchParams(window.location.search).get('token');
+    if (!token) return;
+
+    void authClient.verifyMagicLink(token).then(async ({ error }) => {
+      if (!error) {
+        // Refresh here too. This tab set the cookie, but its provider state
+        // was loaded before the cookie existed.
+        await refreshSession();
+      }
+    });
+  }, [authClient, refreshSession]);
+
+  return <p>Finishing sign-in...</p>;
+}
+```
+
+The auth API emails a link pointing at `/verify-magiclink?token=...`, so a custom app must serve that
+path.
+
+### Credential management
+
+`useAuth()` exposes the signed-in user's passkeys plus helpers to rename and remove them. These
+helpers update provider state on success and report failure through `error`.
+
+```tsx
+import { useAuth } from '@seamless-auth/react';
+import type { Credential } from '@seamless-auth/react';
+import { useState } from 'react';
+
+function PasskeyList() {
+  const { credentials, updateCredential, deleteCredential } = useAuth();
+  const [message, setMessage] = useState('');
+
+  async function rename(credential: Credential, friendlyName: string) {
+    const { error } = await updateCredential({ ...credential, friendlyName });
+
+    if (error) {
+      setMessage(error.message);
+    }
+  }
+
+  async function remove(credentialId: string) {
+    const { error } = await deleteCredential(credentialId);
+
+    if (error) {
+      setMessage(error.message);
+    }
+  }
+
+  return (
+    <ul>
+      {credentials.map(credential => (
+        <li key={credential.id}>
+          {credential.friendlyName ?? credential.deviceInfo}
+          <button onClick={() => void rename(credential, 'Work laptop')}>Rename</button>
+          <button onClick={() => void remove(credential.id)}>Remove</button>
+        </li>
+      ))}
+    </ul>
+  );
+}
+```
+
+`Credential.lastUsedAt` and `Credential.createdAt` are ISO 8601 strings, which is what the API sends.
+Wrap them yourself to format:
+
+```tsx
+const lastUsed = credential.lastUsedAt ? new Date(credential.lastUsedAt) : null;
+```
+
+Removing a passkey is a sensitive change. Gate it behind a fresh step-up when the account has other
+factors, using `refreshStepUpStatus()` and `verifyStepUpWithPasskey()` from the step-up section.
+
+## Built-In Routes
+
+`AuthRoutes` serves these canonical paths:
+
+- `/login`
+- `/passkey-login`
+- `/verify-phone-otp`
+- `/verify-email-otp`
+- `/verify-magic-link`
+- `/oauth/callback`
+- `/register-passkey`
+- `/magic-link-sent`
+
+These are optional UI wrappers over the same SDK primitives the package now exports for custom flows.
+
+### Renamed routes
+
+The earlier mixed-case paths were renamed and are no longer served. Anything linking directly to
+them now falls through to `/login`, so update those links:
+
+| Old path           | New path            |
+| ------------------ | ------------------- |
+| `/passKeyLogin`    | `/passkey-login`    |
+| `/verifyPhoneOTP`  | `/verify-phone-otp` |
+| `/verifyEmailOTP`  | `/verify-email-otp` |
+| `/registerPasskey` | `/register-passkey` |
+| `/magiclinks-sent` | `/magic-link-sent`  |
+
+Two paths are unchanged because they are owned by contracts outside this package:
+
+- `/verify-magiclink` is the URL the auth API builds when it emails a magic link, so it has to match
+  that value exactly. Renaming it here would send every emailed link to `/login` with the token
+  discarded.
+- `/oauth/callback` is registered with OAuth providers as an allowed redirect URI, so renaming it
+  would break configured integrations.
+
+## Theming The Built-In UI
+
+Every colour in the built-in screens is a CSS custom property with a fallback, so the default look is
+unchanged if you set nothing. To match your brand, set the tokens you care about on `:root`, or on any
+element that wraps `<AuthRoutes />`.
+
+```css
+:root {
+  --seamless-accent: #1f3a34;
+  --seamless-accent-hover: #16302b;
+  --seamless-surface: #f7f5f0;
+  --seamless-text: #1a1a1a;
+}
+```
+
+Scoping to a wrapper also works, which is useful when the auth screens should look different from the
+rest of the app:
+
+```css
+.auth-shell {
+  --seamless-accent: #1f3a34;
+  --seamless-accent-soft: #3c6f63;
+}
+```
+
+There is no provider prop or JavaScript API for this. Setting the variables is the whole interface.
+
+### Tokens
+
+| Token                        | Used for                                                               | Default                                       |
+| ---------------------------- | ---------------------------------------------------------------------- | --------------------------------------------- |
+| `--seamless-accent`          | Primary buttons, focus rings, selected states, accent borders, spinner | `#2563eb` fills, `#3b82f6` rings and borders  |
+| `--seamless-accent-hover`    | Hover state of primary buttons                                         | `#1d4ed8`                                     |
+| `--seamless-accent-contrast` | Label text on accent-filled buttons                                    | `white`                                       |
+| `--seamless-accent-soft`     | Links, toggle buttons, accent icons                                    | `#60a5fa`, `#a5b4fc` on the magic-link screen |
+| `--seamless-surface`         | Card and modal backgrounds                                             | `#1f2937`                                     |
+| `--seamless-surface-raised`  | Inputs and panels sitting on a card                                    | `#374151`, `#4b5563` on the login form        |
+| `--seamless-surface-hover`   | Hover state of secondary buttons                                       | `#4b5563`                                     |
+| `--seamless-border`          | Input, button, and panel borders                                       | `#4b5563`, `#d1d5db`                          |
+| `--seamless-text`            | Headings and body text                                                 | `white`                                       |
+| `--seamless-text-muted`      | Labels, helper text, secondary copy                                    | `#9ca3af`, `#d1d5db`                          |
+| `--seamless-danger`          | Error messages                                                         | `#f87171`                                     |
+| `--seamless-success`         | Success messages and the verified check icon                           | `#34d399`                                     |
+| `--seamless-warning`         | OTP countdown and resend timers                                        | `#facc15`                                     |
+| `--seamless-overlay`         | Modal backdrop scrim                                                   | `rgba(0, 0, 0, 0.45)`                         |
+| `--seamless-shadow`          | Card and modal shadow colour                                           | `rgba(0, 0, 0, 0.1)` to `rgba(0, 0, 0, 0.4)`  |
+
+### Notes
+
+- Where the original design used near-duplicate shades for the same role, each declaration keeps its
+  own original value as the fallback. That is why some rows list more than one default. Nothing shifts
+  until you set the token, and once you do, every use of that role picks up your value.
+- `--seamless-shadow` is the shadow colour only. Offsets and blur are fixed. Setting it applies one
+  colour to every shadow in the built-in UI, replacing the per-screen alpha values.
+- If you set `--seamless-surface` to a light colour, set `--seamless-text` too. The default text
+  colour is white and will disappear otherwise.
+- Two decorative tints are deliberately not tokenised: the pulse ring behind the magic-link mail icon
+  and the disc behind the success check. Both are translucent and sit directly under an icon, so an
+  opaque override would hide the icon it is meant to frame.
+- Disabled buttons are not a separate colour. They are the enabled button at reduced opacity, so the
+  label and its background always come from the same accent pair you set and the contrast between
+  them cannot invert when the theme changes. `--seamless-disabled` used to set a standalone grey fill
+  and no longer does anything; remove it from your overrides.
+- The package ships one palette and no `prefers-color-scheme` rules. If you want the auth UI to follow
+  the system theme, wrap your own overrides in a media query.
+
+## Backend Expectations
+
+This package assumes a Seamless Auth-compatible backend with the auth adapter mounted at `/auth`.
+
+- Requests target `${apiHost}/auth/...`
+- `apiHost` may be provided with or without a trailing slash
+- Requests are sent with `credentials: 'include'`
+- `AuthProvider` validates the current session by calling `/users/me` on load
+
+The built-in flows assume compatible endpoints for:
+
+- `/login`
+- `DELETE /logout` for the current session
+- `DELETE /logout/all` for every session owned by the current user
+- `/registration/register`
+- `/webAuthn/login/start`
+- `/webAuthn/login/finish`
+- `/webAuthn/register/start`
+- `/webAuthn/register/finish`
+- `POST /otp/generate-phone-otp`
+- `POST /otp/generate-email-otp`
+- `/otp/verify-phone-otp`
+- `/otp/verify-email-otp`
+- `POST /otp/generate-login-phone-otp`
+- `POST /otp/generate-login-email-otp`
+- `/otp/verify-login-phone-otp`
+- `/otp/verify-login-email-otp`
+- `POST /magic-link`
+- `/magic-link/check`
+- `/magic-link/verify/:token`
+- `/oauth/providers`
+- `/oauth/:providerId/start`
+- `/oauth/:providerId/callback`
+- `/step-up/status`
+- `/step-up/webauthn/start`
+- `/step-up/webauthn/finish`
+- `/totp/status`
+- `/totp/enroll/start`
+- `/totp/enroll/verify`
+- `/totp/disable`
+- `/totp/verify-mfa`
+- `/users/me`
+- `/users/credentials`
+- `/users/delete`
+- `/organizations`
+- `/organizations/:organizationId`
+- `/organizations/:organizationId/switch`
+- `/organizations/:organizationId/members`
+- `/organizations/:organizationId/members/:userId`
+
+The state-changing OTP and magic-link request routes are `POST` (marked above). They were previously
+`GET`, which made them reachable as simple cross-site requests, so an `<img>` tag could trigger SMS or
+email sends to a signed-in user. Using `@seamless-auth/react` with an older adapter that only serves the
+`GET` forms returns a 404 for those requests. See the changelog for the minimum adapter version.
+
+`/webAuthn/register/finish` can refuse a verified credential on policy grounds with a `403` whose
+body is a stable code. `syncedPasskeys` defaults to `allow`, but a deployment that sets `block`
+refuses every backup-eligible passkey, so handle the code rather than assuming the default. See
+[Passkey policy refusals](#passkey-policy-refusals).
+
+## Notes
+
+- This package does not create its own `<BrowserRouter>`.
+- It is designed to fit into your app’s existing routing tree.
+- The quickest path is `AuthProvider` + `AuthRoutes`.
+- The most flexible path is `AuthProvider` + custom UI using `useAuth()`, `useAuthClient()`, and `usePasskeySupport()`.
+
+## License
+
+AGPL-3.0-only
diff --git a/packages/react/jest.config.ts b/packages/react/jest.config.ts
new file mode 100644
index 0000000..1c0039a
--- /dev/null
+++ b/packages/react/jest.config.ts
@@ -0,0 +1,25 @@
+/*
+ * Copyright © 2026 Fells Code, LLC
+ * Licensed under the GNU Affero General Public License v3.0
+ * See LICENSE file in the project root for full license information
+ */
+
+export default {
+  displayName: 'react',
+  preset: 'ts-jest',
+  testEnvironment: 'jsdom',
+  rootDir: '.',
+  setupFilesAfterEnv: ['<rootDir>/../../jest.setup.ts'],
+  transform: {
+    '^.+\\.(t|j)sx?$': ['ts-jest', { useESM: true, tsconfig: '<rootDir>/tsconfig.json' }],
+  },
+  extensionsToTreatAsEsm: ['.ts', '.tsx'],
+  moduleNameMapper: {
+    '\\.(css|less|scss|sass)$': 'identity-obj-proxy',
+    '^@/(.*)$': '<rootDir>/src/$1',
+    // Tests run against the client source, so a change there is exercised here
+    // without a build in between.
+    '^@seamless-auth/client$': '<rootDir>/../client/src/index.ts',
+  },
+  testMatch: ['<rootDir>/tests/**/*.(test|spec).[tj]s?(x)'],
+};
diff --git a/packages/react/package.json b/packages/react/package.json
new file mode 100644
index 0000000..729dbbb
--- /dev/null
+++ b/packages/react/package.json
@@ -0,0 +1,56 @@
+{
+  "name": "@seamless-auth/react",
+  "version": "0.12.0",
+  "description": "A drop-in authentication solution for modern React applications.",
+  "type": "module",
+  "exports": {
+    ".": {
+      "import": "./dist/index.js",
+      "types": "./dist/index.d.ts"
+    }
+  },
+  "types": "./dist/index.d.ts",
+  "files": [
+    "dist",
+    "README.md",
+    "CHANGELOG.md",
+    "LICENSE"
+  ],
+  "engines": {
+    "node": ">=24.0.0 <25.0.0",
+    "npm": ">=9.0.0 <13.0.0"
+  },
+  "scripts": {
+    "build": "node ../../scripts/clean-dist.mjs && rollup -c && tsc-alias -p tsconfig.build.json",
+    "typecheck": "tsc --noEmit -p tsconfig.dev.json",
+    "check-npm-build": "npm pack --dry-run"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/fells-code/seamless-auth-react.git",
+    "directory": "packages/react"
+  },
+  "author": "Fells Code, LLC",
+  "license": "AGPL-3.0-only",
+  "bugs": {
+    "url": "https://github.com/fells-code/seamless-auth-react/issues"
+  },
+  "homepage": "https://github.com/fells-code/seamless-auth-react#readme",
+  "publishConfig": {
+    "access": "public",
+    "registry": "https://registry.npmjs.org/",
+    "provenance": true
+  },
+  "peerDependencies": {
+    "react": "^18.0.0 || ^19.0.0",
+    "react-dom": "^18.0.0 || ^19.0.0",
+    "react-router-dom": "^6.4.0 || ^7.15.1"
+  },
+  "dependencies": {
+    "@seamless-auth/client": "^0.0.0",
+    "@seamless-auth/types": "^0.20.0",
+    "@simplewebauthn/browser": "^13.1.0",
+    "libphonenumber-js": "^1.12.7"
+  },
+  "sideEffects": false
+}
diff --git a/rollup.config.js b/packages/react/rollup.config.js
similarity index 97%
rename from rollup.config.js
rename to packages/react/rollup.config.js
index 394e805..2cc802f 100644
--- a/rollup.config.js
+++ b/packages/react/rollup.config.js
@@ -22,7 +22,7 @@ export default [
       'react',
       'react-dom',
       'react-router-dom',
-
+      '@seamless-auth/client',
       '@simplewebauthn/browser',
       'libphonenumber-js',
     ],
diff --git a/src/AuthProvider.tsx b/packages/react/src/AuthProvider.tsx
similarity index 94%
rename from src/AuthProvider.tsx
rename to packages/react/src/AuthProvider.tsx
index 75357c2..4951d98 100644
--- a/src/AuthProvider.tsx
+++ b/packages/react/src/AuthProvider.tsx
@@ -20,11 +20,11 @@ import {
   StartOAuthLoginResult,
   StepUpPrfData,
   StepUpStatus,
-} from '@/client/createSeamlessAuthClient';
-import type { SeamlessAuthResult } from '@/client/result';
-import { PasskeyPrfInput } from '@/client/webauthnPrf';
-import { createAuthSession } from '@/session/createAuthSession';
-import { Credential, Organization, User } from '@/types';
+} from '@seamless-auth/client';
+import type { SeamlessAuthResult } from '@seamless-auth/client';
+import { PasskeyPrfInput } from '@seamless-auth/client';
+import { createAuthSession } from '@seamless-auth/client';
+import { Credential, Organization, User } from '@seamless-auth/client';
 import React, {
   createContext,
   ReactNode,
diff --git a/src/AuthRoutes.tsx b/packages/react/src/AuthRoutes.tsx
similarity index 100%
rename from src/AuthRoutes.tsx
rename to packages/react/src/AuthRoutes.tsx
diff --git a/src/components/AuthFallbackOptions.tsx b/packages/react/src/components/AuthFallbackOptions.tsx
similarity index 97%
rename from src/components/AuthFallbackOptions.tsx
rename to packages/react/src/components/AuthFallbackOptions.tsx
index f103029..a1107f7 100644
--- a/src/components/AuthFallbackOptions.tsx
+++ b/packages/react/src/components/AuthFallbackOptions.tsx
@@ -6,7 +6,7 @@
 
 import React from 'react';
 import { isValidEmail, isValidPhoneNumber } from '../utils';
-import type { LoginMethod } from '@/client/createSeamlessAuthClient';
+import type { LoginMethod } from '@seamless-auth/client';
 
 import styles from '../styles/login.module.css';
 
diff --git a/src/components/MagicLinkSent.tsx b/packages/react/src/components/MagicLinkSent.tsx
similarity index 100%
rename from src/components/MagicLinkSent.tsx
rename to packages/react/src/components/MagicLinkSent.tsx
diff --git a/src/components/OAuthProviderButtons.tsx b/packages/react/src/components/OAuthProviderButtons.tsx
similarity index 96%
rename from src/components/OAuthProviderButtons.tsx
rename to packages/react/src/components/OAuthProviderButtons.tsx
index 8bc838d..c1b7b48 100644
--- a/src/components/OAuthProviderButtons.tsx
+++ b/packages/react/src/components/OAuthProviderButtons.tsx
@@ -7,7 +7,7 @@
 import React, { useEffect, useState } from 'react';
 import { useHref } from 'react-router-dom';
 import { useAuth } from '@/AuthProvider';
-import type { OAuthProvider } from '@/client/createSeamlessAuthClient';
+import type { OAuthProvider } from '@seamless-auth/client';
 
 import styles from '../styles/login.module.css';
 
diff --git a/src/components/OtpInput.tsx b/packages/react/src/components/OtpInput.tsx
similarity index 100%
rename from src/components/OtpInput.tsx
rename to packages/react/src/components/OtpInput.tsx
diff --git a/src/components/TermsModal.tsx b/packages/react/src/components/TermsModal.tsx
similarity index 100%
rename from src/components/TermsModal.tsx
rename to packages/react/src/components/TermsModal.tsx
diff --git a/src/components/phoneInput.tsx b/packages/react/src/components/phoneInput.tsx
similarity index 100%
rename from src/components/phoneInput.tsx
rename to packages/react/src/components/phoneInput.tsx
diff --git a/src/hooks/useAuthClient.ts b/packages/react/src/hooks/useAuthClient.ts
similarity index 86%
rename from src/hooks/useAuthClient.ts
rename to packages/react/src/hooks/useAuthClient.ts
index 35b5001..1e9bb17 100644
--- a/src/hooks/useAuthClient.ts
+++ b/packages/react/src/hooks/useAuthClient.ts
@@ -7,7 +7,7 @@
 import { useMemo } from 'react';
 
 import { useAuth } from '@/AuthProvider';
-import { createSeamlessAuthClient } from '@/client/createSeamlessAuthClient';
+import { createSeamlessAuthClient } from '@seamless-auth/client';
 
 export const useAuthClient = () => {
   const { apiHost, magicLinkRedirectUri } = useAuth();
diff --git a/src/hooks/useLoginMethods.ts b/packages/react/src/hooks/useLoginMethods.ts
similarity index 97%
rename from src/hooks/useLoginMethods.ts
rename to packages/react/src/hooks/useLoginMethods.ts
index a57bfd0..d7f4c8e 100644
--- a/src/hooks/useLoginMethods.ts
+++ b/packages/react/src/hooks/useLoginMethods.ts
@@ -6,7 +6,7 @@
 
 import { useEffect, useState } from 'react';
 
-import type { LoginMethod } from '@/client/createSeamlessAuthClient';
+import type { LoginMethod } from '@seamless-auth/client';
 import { useAuthClient } from '@/hooks/useAuthClient';
 
 /**
diff --git a/src/hooks/usePasskeySupport.ts b/packages/react/src/hooks/usePasskeySupport.ts
similarity index 100%
rename from src/hooks/usePasskeySupport.ts
rename to packages/react/src/hooks/usePasskeySupport.ts
diff --git a/src/index.ts b/packages/react/src/index.ts
similarity index 90%
rename from src/index.ts
rename to packages/react/src/index.ts
index 35c6bdd..3b72e12 100644
--- a/src/index.ts
+++ b/packages/react/src/index.ts
@@ -43,7 +43,7 @@ import {
   TotpEnrollmentStartResult,
   TotpStatus,
   UpdateOrganizationInput,
-} from '@/client/createSeamlessAuthClient';
+} from '@seamless-auth/client';
 import {
   getOAuthErrorCode,
   getPasskeyPolicyErrorCode,
@@ -53,20 +53,25 @@ import {
   PasskeyPolicyErrorCode,
   SeamlessAuthError,
   WebAuthnErrorDetail,
-} from '@/client/errors';
-import type { SeamlessAuthResult } from '@/client/result';
+} from '@seamless-auth/client';
+import type { SeamlessAuthResult } from '@seamless-auth/client';
 import {
   encodePrfSalt,
   extractPasskeyPrfResult,
   isPasskeyPrfSupported,
   PasskeyPrfInput,
   PasskeyPrfResult,
-} from '@/client/webauthnPrf';
+} from '@seamless-auth/client';
 import { useAuthClient } from '@/hooks/useAuthClient';
 import { hasNonPasskeyLoginMethod, useLoginMethods } from '@/hooks/useLoginMethods';
 import { usePasskeySupport } from '@/hooks/usePasskeySupport';
-import { hasScopedRole, roleGrantsAccess } from '@/scopedRoles';
-import { Credential, Organization, OrganizationMembership, User } from '@/types';
+import { hasScopedRole, roleGrantsAccess } from '@seamless-auth/client';
+import {
+  Credential,
+  Organization,
+  OrganizationMembership,
+  User,
+} from '@seamless-auth/client';
 
 export {
   AuthProvider,
diff --git a/src/routes.ts b/packages/react/src/routes.ts
similarity index 100%
rename from src/routes.ts
rename to packages/react/src/routes.ts
diff --git a/src/styles/index.css.d.ts b/packages/react/src/styles/index.css.d.ts
similarity index 100%
rename from src/styles/index.css.d.ts
rename to packages/react/src/styles/index.css.d.ts
diff --git a/src/styles/login.module.css b/packages/react/src/styles/login.module.css
similarity index 100%
rename from src/styles/login.module.css
rename to packages/react/src/styles/login.module.css
diff --git a/src/styles/magiclink.module.css b/packages/react/src/styles/magiclink.module.css
similarity index 100%
rename from src/styles/magiclink.module.css
rename to packages/react/src/styles/magiclink.module.css
diff --git a/src/styles/mfaLogin.module.css b/packages/react/src/styles/mfaLogin.module.css
similarity index 100%
rename from src/styles/mfaLogin.module.css
rename to packages/react/src/styles/mfaLogin.module.css
diff --git a/src/styles/otpInput.module.css b/packages/react/src/styles/otpInput.module.css
similarity index 100%
rename from src/styles/otpInput.module.css
rename to packages/react/src/styles/otpInput.module.css
diff --git a/src/styles/passKeyLogin.module.css b/packages/react/src/styles/passKeyLogin.module.css
similarity index 100%
rename from src/styles/passKeyLogin.module.css
rename to packages/react/src/styles/passKeyLogin.module.css
diff --git a/src/styles/registerPasskey.module.css b/packages/react/src/styles/registerPasskey.module.css
similarity index 100%
rename from src/styles/registerPasskey.module.css
rename to packages/react/src/styles/registerPasskey.module.css
diff --git a/src/styles/termsModal.module.css b/packages/react/src/styles/termsModal.module.css
similarity index 100%
rename from src/styles/termsModal.module.css
rename to packages/react/src/styles/termsModal.module.css
diff --git a/src/styles/verifyMagiclink.module.css b/packages/react/src/styles/verifyMagiclink.module.css
similarity index 100%
rename from src/styles/verifyMagiclink.module.css
rename to packages/react/src/styles/verifyMagiclink.module.css
diff --git a/src/styles/verifyOTP.module.css b/packages/react/src/styles/verifyOTP.module.css
similarity index 100%
rename from src/styles/verifyOTP.module.css
rename to packages/react/src/styles/verifyOTP.module.css
diff --git a/src/utils.ts b/packages/react/src/utils.ts
similarity index 97%
rename from src/utils.ts
rename to packages/react/src/utils.ts
index e61d026..d46477a 100644
--- a/src/utils.ts
+++ b/packages/react/src/utils.ts
@@ -6,7 +6,7 @@
 
 import parsePhoneNumberFromString from 'libphonenumber-js';
 
-import { isPlatformAuthenticatorAvailable } from '@/client/webauthnSupport';
+import { isPlatformAuthenticatorAvailable } from '@seamless-auth/client';
 /**
  * isValidEmail
  *
diff --git a/src/views/EmailRegistration.tsx b/packages/react/src/views/EmailRegistration.tsx
similarity index 100%
rename from src/views/EmailRegistration.tsx
rename to packages/react/src/views/EmailRegistration.tsx
diff --git a/src/views/Login.tsx b/packages/react/src/views/Login.tsx
similarity index 99%
rename from src/views/Login.tsx
rename to packages/react/src/views/Login.tsx
index bcea136..3839fec 100644
--- a/src/views/Login.tsx
+++ b/packages/react/src/views/Login.tsx
@@ -15,7 +15,7 @@ import styles from '@/styles/login.module.css';
 import { isValidEmail, isValidPhoneNumber } from '../utils';
 import AuthFallbackOptions from '@/components/AuthFallbackOptions';
 import OAuthProviderButtons from '@/components/OAuthProviderButtons';
-import type { LoginMethod } from '@/client/createSeamlessAuthClient';
+import type { LoginMethod } from '@seamless-auth/client';
 
 const Login: React.FC = () => {
   const navigate = useNavigate();
diff --git a/src/views/OAuthCallback.tsx b/packages/react/src/views/OAuthCallback.tsx
similarity index 97%
rename from src/views/OAuthCallback.tsx
rename to packages/react/src/views/OAuthCallback.tsx
index 42626f0..25d81f1 100644
--- a/src/views/OAuthCallback.tsx
+++ b/packages/react/src/views/OAuthCallback.tsx
@@ -7,7 +7,7 @@
 import React, { useEffect, useRef, useState } from 'react';
 import { useNavigate, useSearchParams } from 'react-router-dom';
 import { useAuth } from '@/AuthProvider';
-import { getOAuthErrorCode, OAuthErrorCode } from '@/client/errors';
+import { getOAuthErrorCode, OAuthErrorCode } from '@seamless-auth/client';
 import { OAUTH_PROVIDER_STORAGE_KEY } from '@/components/OAuthProviderButtons';
 
 import styles from '@/styles/verifyMagiclink.module.css';
diff --git a/src/views/PassKeyLogin.tsx b/packages/react/src/views/PassKeyLogin.tsx
similarity index 100%
rename from src/views/PassKeyLogin.tsx
rename to packages/react/src/views/PassKeyLogin.tsx
diff --git a/src/views/PassKeyRegistration.tsx b/packages/react/src/views/PassKeyRegistration.tsx
similarity index 98%
rename from src/views/PassKeyRegistration.tsx
rename to packages/react/src/views/PassKeyRegistration.tsx
index 1541fba..66d0c0e 100644
--- a/src/views/PassKeyRegistration.tsx
+++ b/packages/react/src/views/PassKeyRegistration.tsx
@@ -5,12 +5,12 @@
  */
 
 import { useAuth } from '@/AuthProvider';
-import { PasskeyAttachment, PasskeyMetadata } from '@/client/createSeamlessAuthClient';
+import { PasskeyAttachment, PasskeyMetadata } from '@seamless-auth/client';
 import {
   getPasskeyPolicyErrorCode,
   isUnauthenticated,
   type PasskeyPolicyErrorCode,
-} from '@/client/errors';
+} from '@seamless-auth/client';
 import React, { useState } from 'react';
 import { useAuthClient } from '@/hooks/useAuthClient';
 import { hasNonPasskeyLoginMethod, useLoginMethods } from '@/hooks/useLoginMethods';
diff --git a/src/views/PhoneRegistration.tsx b/packages/react/src/views/PhoneRegistration.tsx
similarity index 100%
rename from src/views/PhoneRegistration.tsx
rename to packages/react/src/views/PhoneRegistration.tsx
diff --git a/src/views/VerifyMagicLink.tsx b/packages/react/src/views/VerifyMagicLink.tsx
similarity index 100%
rename from src/views/VerifyMagicLink.tsx
rename to packages/react/src/views/VerifyMagicLink.tsx
diff --git a/tests/AuthFallbackOptions.test.tsx b/packages/react/tests/AuthFallbackOptions.test.tsx
similarity index 100%
rename from tests/AuthFallbackOptions.test.tsx
rename to packages/react/tests/AuthFallbackOptions.test.tsx
diff --git a/tests/AuthRoutes.test.tsx b/packages/react/tests/AuthRoutes.test.tsx
similarity index 100%
rename from tests/AuthRoutes.test.tsx
rename to packages/react/tests/AuthRoutes.test.tsx
diff --git a/tests/EmailRegistration.test.tsx b/packages/react/tests/EmailRegistration.test.tsx
similarity index 100%
rename from tests/EmailRegistration.test.tsx
rename to packages/react/tests/EmailRegistration.test.tsx
diff --git a/tests/MagicLinkSent.test.tsx b/packages/react/tests/MagicLinkSent.test.tsx
similarity index 100%
rename from tests/MagicLinkSent.test.tsx
rename to packages/react/tests/MagicLinkSent.test.tsx
diff --git a/tests/OAuthCallback.test.tsx b/packages/react/tests/OAuthCallback.test.tsx
similarity index 98%
rename from tests/OAuthCallback.test.tsx
rename to packages/react/tests/OAuthCallback.test.tsx
index a8eef69..5e894a2 100644
--- a/tests/OAuthCallback.test.tsx
+++ b/packages/react/tests/OAuthCallback.test.tsx
@@ -8,7 +8,7 @@ import { render, screen, waitFor } from '@testing-library/react';
 import OAuthCallback from '@/views/OAuthCallback';
 
 import { useAuth } from '@/AuthProvider';
-import { SeamlessAuthError } from '@/client/errors';
+import { SeamlessAuthError } from '@seamless-auth/client';
 import { useNavigate, useSearchParams } from 'react-router-dom';
 
 jest.mock('@/AuthProvider');
diff --git a/tests/OAuthProviderButtons.test.tsx b/packages/react/tests/OAuthProviderButtons.test.tsx
similarity index 100%
rename from tests/OAuthProviderButtons.test.tsx
rename to packages/react/tests/OAuthProviderButtons.test.tsx
diff --git a/tests/OtpInput.test.tsx b/packages/react/tests/OtpInput.test.tsx
similarity index 100%
rename from tests/OtpInput.test.tsx
rename to packages/react/tests/OtpInput.test.tsx
diff --git a/tests/PassKeyLogin.test.tsx b/packages/react/tests/PassKeyLogin.test.tsx
similarity index 100%
rename from tests/PassKeyLogin.test.tsx
rename to packages/react/tests/PassKeyLogin.test.tsx
diff --git a/tests/PhoneInput.test.tsx b/packages/react/tests/PhoneInput.test.tsx
similarity index 100%
rename from tests/PhoneInput.test.tsx
rename to packages/react/tests/PhoneInput.test.tsx
diff --git a/tests/PhoneRegistration.test.tsx b/packages/react/tests/PhoneRegistration.test.tsx
similarity index 100%
rename from tests/PhoneRegistration.test.tsx
rename to packages/react/tests/PhoneRegistration.test.tsx
diff --git a/tests/RegisterPassKey.test.tsx b/packages/react/tests/RegisterPassKey.test.tsx
similarity index 99%
rename from tests/RegisterPassKey.test.tsx
rename to packages/react/tests/RegisterPassKey.test.tsx
index 4c3e970..f4f04a0 100644
--- a/tests/RegisterPassKey.test.tsx
+++ b/packages/react/tests/RegisterPassKey.test.tsx
@@ -6,7 +6,7 @@
 
 import { render, screen, fireEvent, waitFor } from '@testing-library/react';
 import RegisterPasskey from '../src/views/PassKeyRegistration';
-import { SeamlessAuthError } from '@/client/errors';
+import { SeamlessAuthError } from '@seamless-auth/client';
 import { useAuthClient } from '@/hooks/useAuthClient';
 import { useLoginMethods } from '@/hooks/useLoginMethods';
 import { usePasskeySupport } from '@/hooks/usePasskeySupport';
diff --git a/tests/TermsModal.test.tsx b/packages/react/tests/TermsModal.test.tsx
similarity index 100%
rename from tests/TermsModal.test.tsx
rename to packages/react/tests/TermsModal.test.tsx
diff --git a/tests/VerifyMagicLink.test.tsx b/packages/react/tests/VerifyMagicLink.test.tsx
similarity index 100%
rename from tests/VerifyMagicLink.test.tsx
rename to packages/react/tests/VerifyMagicLink.test.tsx
diff --git a/tests/authProvider.test.tsx b/packages/react/tests/authProvider.test.tsx
similarity index 99%
rename from tests/authProvider.test.tsx
rename to packages/react/tests/authProvider.test.tsx
index ecde6f9..9bb7452 100644
--- a/tests/authProvider.test.tsx
+++ b/packages/react/tests/authProvider.test.tsx
@@ -7,9 +7,9 @@
 import { act, fireEvent, render, screen, waitFor } from '@testing-library/react';
 import { StrictMode } from 'react';
 import { AuthProvider, useAuth } from '../src/AuthProvider';
-import { createFetchWithAuth } from '../src/fetchWithAuth';
+import { createFetchWithAuth } from '../../client/src/fetchWithAuth';
 
-jest.mock('../src/fetchWithAuth');
+jest.mock('../../client/src/fetchWithAuth');
 
 // the mock returned fetch function
 const mockFetchWithAuthImpl = jest.fn();
diff --git a/tests/login.test.tsx b/packages/react/tests/login.test.tsx
similarity index 100%
rename from tests/login.test.tsx
rename to packages/react/tests/login.test.tsx
diff --git a/tests/magicLinkDestination.test.tsx b/packages/react/tests/magicLinkDestination.test.tsx
similarity index 97%
rename from tests/magicLinkDestination.test.tsx
rename to packages/react/tests/magicLinkDestination.test.tsx
index b2eed36..7b03df0 100644
--- a/tests/magicLinkDestination.test.tsx
+++ b/packages/react/tests/magicLinkDestination.test.tsx
@@ -9,13 +9,13 @@ import { render, screen, fireEvent, act } from '@testing-library/react';
 import Login from '@/views/Login';
 import MagicLinkSent from '@/components/MagicLinkSent';
 import { useAuth } from '@/AuthProvider';
-import { createFetchWithAuth } from '@/fetchWithAuth';
+import { createFetchWithAuth } from '../../client/src/fetchWithAuth';
 import { useNavigate, useLocation } from 'react-router-dom';
 
 // `useAuthClient` and the client itself stay real here: the whole point is that
 // the destination survives the trip from provider config into the request body.
 jest.mock('@/AuthProvider');
-jest.mock('@/fetchWithAuth');
+jest.mock('../../client/src/fetchWithAuth');
 jest.mock('@/utils', () => ({
   isValidEmail: jest.fn(() => true),
   isValidPhoneNumber: jest.fn(() => false),
diff --git a/tests/useAuthClient.test.tsx b/packages/react/tests/useAuthClient.test.tsx
similarity index 89%
rename from tests/useAuthClient.test.tsx
rename to packages/react/tests/useAuthClient.test.tsx
index ad5a50c..22e0944 100644
--- a/tests/useAuthClient.test.tsx
+++ b/packages/react/tests/useAuthClient.test.tsx
@@ -7,11 +7,11 @@
 import { renderHook } from '@testing-library/react';
 
 import { useAuth } from '@/AuthProvider';
-import { createSeamlessAuthClient } from '@/client/createSeamlessAuthClient';
+import { createSeamlessAuthClient } from '../../client/src/client/createSeamlessAuthClient';
 import { useAuthClient } from '@/hooks/useAuthClient';
 
 jest.mock('@/AuthProvider');
-jest.mock('@/client/createSeamlessAuthClient');
+jest.mock('../../client/src/client/createSeamlessAuthClient');
 
 describe('useAuthClient', () => {
   it('creates a client from the current auth config', () => {
diff --git a/tests/useLoginMethods.test.tsx b/packages/react/tests/useLoginMethods.test.tsx
similarity index 100%
rename from tests/useLoginMethods.test.tsx
rename to packages/react/tests/useLoginMethods.test.tsx
diff --git a/tests/usePasskeySupport.test.tsx b/packages/react/tests/usePasskeySupport.test.tsx
similarity index 100%
rename from tests/usePasskeySupport.test.tsx
rename to packages/react/tests/usePasskeySupport.test.tsx
diff --git a/tests/utils.test.ts b/packages/react/tests/utils.test.ts
similarity index 100%
rename from tests/utils.test.ts
rename to packages/react/tests/utils.test.ts
diff --git a/packages/react/tsconfig.build.json b/packages/react/tsconfig.build.json
new file mode 100644
index 0000000..22f66ac
--- /dev/null
+++ b/packages/react/tsconfig.build.json
@@ -0,0 +1,15 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "declaration": true,
+    "declarationDir": "./dist",
+    "outDir": "./dist",
+    "sourceMap": true,
+    "rootDir": "./src",
+    "paths": {
+      "@/*": ["./src/*"]
+    }
+  },
+  "include": ["src"],
+  "exclude": ["tests", "**/*.test.ts", "**/*.spec.ts"]
+}
diff --git a/packages/react/tsconfig.dev.json b/packages/react/tsconfig.dev.json
new file mode 100644
index 0000000..a6668d6
--- /dev/null
+++ b/packages/react/tsconfig.dev.json
@@ -0,0 +1,4 @@
+{
+  "extends": "./tsconfig.json",
+  "include": ["src", "tests", "../../jest.setup.ts"]
+}
diff --git a/packages/react/tsconfig.json b/packages/react/tsconfig.json
new file mode 100644
index 0000000..9b7c6d3
--- /dev/null
+++ b/packages/react/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "paths": {
+      "@/*": ["./src/*"],
+      "@seamless-auth/client": ["../client/src/index.ts"]
+    }
+  }
+}
diff --git a/scripts/clean-dist.mjs b/scripts/clean-dist.mjs
index a2d5d7e..09aeeec 100644
--- a/scripts/clean-dist.mjs
+++ b/scripts/clean-dist.mjs
@@ -1,3 +1,5 @@
 import { rm } from 'node:fs/promises';
+import path from 'node:path';
 
-await rm(new URL('../dist', import.meta.url), { force: true, recursive: true });
+// Run from a package directory: clears that package's dist before a build.
+await rm(path.join(process.cwd(), 'dist'), { force: true, recursive: true });
diff --git a/tsconfig.json b/tsconfig.base.json
similarity index 85%
rename from tsconfig.json
rename to tsconfig.base.json
index a2e990d..9398b73 100644
--- a/tsconfig.json
+++ b/tsconfig.base.json
@@ -7,9 +7,6 @@
     "esModuleInterop": true,
     "skipLibCheck": true,
     "strict": true,
-    "paths": {
-      "@/*": ["./src/*"]
-    },
     "types": ["jest", "node", "@testing-library/jest-dom"]
   }
 }
diff --git a/tsconfig.dev.json b/tsconfig.dev.json
deleted file mode 100644
index b9ec368..0000000
--- a/tsconfig.dev.json
+++ /dev/null
@@ -1,4 +0,0 @@
-{
-  "extends": "./tsconfig.json",
-  "include": ["src", "tests"]
-}