diff --git a/UAT_PLAYBOOK.md b/UAT_PLAYBOOK.md
index 68d6d25..56eb127 100644
--- a/UAT_PLAYBOOK.md
+++ b/UAT_PLAYBOOK.md
@@ -28,6 +28,7 @@ GroomBook API is a Hono-based REST service (TypeScript/Node.js) powering the pet
 | TC-API-1.1 | Login via OIDC | POST to OIDC provider callback, verify JWT token issued | 200 OK, JWT returned with valid claims |
 | TC-API-1.2 | Session persistence | Make authenticated request, verify session token valid | 200 OK, request succeeds |
 | TC-API-1.3 | Logout | Call logout endpoint, verify token invalidated | 200 OK, subsequent requests return 401 |
+| TC-API-1.4 | Auto-provision on first OIDC login | First login as a Better-Auth user with no existing staff record | 200 OK, access granted; groomer staff record auto-created with name/email from user table |
 
 ### 4.2 Client Management
 
diff --git a/apps/api/src/__tests__/rbac.test.ts b/apps/api/src/__tests__/rbac.test.ts
index dc3d7de..4b870e5 100644
--- a/apps/api/src/__tests__/rbac.test.ts
+++ b/apps/api/src/__tests__/rbac.test.ts
@@ -45,40 +45,72 @@ const GROOMER: StaffRow = {
 
 let staffLookupResult: StaffRow | null = null;
 let managerFallbackResult: StaffRow | null = MANAGER;
+let userLookupResult: { id: string; name: string | null; email: string | null } | null = null;
+let insertedStaff: StaffRow | null = null;
 
 vi.mock("../db", () => {
-  const staff = new Proxy(
-    { _name: "staff" },
-    {
-      get(target, prop) {
-        if (prop === "_name") return "staff";
-        if (prop === "$inferSelect") return {};
-        return { table: "staff", column: prop };
+  const makeTableProxy = (name: string) =>
+    new Proxy(
+      { _name: name },
+      {
+        get(target, prop) {
+          if (prop === "_name") return name;
+          if (prop === "$inferSelect") return {};
+          return { table: name, column: prop };
+        },
+      }
+    );
+
+  const staff = makeTableProxy("staff");
+  const user = makeTableProxy("user");
+
+  const buildQuery = (result: unknown, fallback: unknown) => ({
+    limit: () => ({
+      [Symbol.iterator]: function* () {
+        if (result) yield result;
       },
-    }
-  );
+      0: result,
+      length: result ? 1 : 0,
+    }),
+  });
 
   return {
     getDb: () => ({
       select: () => ({
-        from: () => ({
-          where: () => ({
-            limit: () => {
-              // dev mode fallback to first manager
-              return managerFallbackResult ? [managerFallbackResult] : [];
-            },
-            [Symbol.iterator]: function* () {
-              if (staffLookupResult) yield staffLookupResult;
-            },
-            0: staffLookupResult,
-            length: staffLookupResult ? 1 : 0,
-          }),
+        from: (table: unknown) => ({
+          where: () => buildQuery(
+            table === staff ? staffLookupResult : userLookupResult,
+            table === staff ? managerFallbackResult : null
+          ),
+        }),
+      }),
+      insert: (table: unknown) => ({
+        values: (vals: Record<string, unknown>) => ({
+          returning: () => {
+            const newStaff: StaffRow = {
+              id: "new-staff-id",
+              oidcSub: null,
+              userId: vals.userId as string,
+              role: vals.role as StaffRow["role"],
+              isSuperUser: false,
+              name: vals.name as string,
+              email: vals.email as string,
+              active: true,
+              icalToken: null,
+              createdAt: new Date(),
+              updatedAt: new Date(),
+            };
+            insertedStaff = newStaff;
+            return [newStaff];
+          },
         }),
       }),
     }),
     staff,
+    user,
     eq: vi.fn((_col: unknown, _val: unknown) => ({ col: _col, val: _val })),
     and: vi.fn((..._clauses: unknown[]) => ({})),
+    sql: vi.fn((..._args: unknown[]) => ({})),
   };
 });
 
@@ -87,6 +119,8 @@ vi.mock("../db", () => {
 function resetMocks() {
   staffLookupResult = null;
   managerFallbackResult = MANAGER;
+  userLookupResult = null;
+  insertedStaff = null;
 }
 
 /** Build a minimal Hono app with jwtPayload pre-set, then apply a middleware. */
@@ -202,6 +236,50 @@ describe("resolveStaffMiddleware", () => {
     const body = await res.json();
     expect(body.error).toMatch(/no staff records found/i);
   });
+
+  it("auto-provision: creates groomer staff record on first login when Better-Auth user exists", async () => {
+    staffLookupResult = null;
+    userLookupResult = { id: "ba-user-new", name: "New User", email: "newuser@example.com" };
+    let capturedStaff: StaffRow | null = null;
+    const app = buildApp(resolveStaffMiddleware, (c) => {
+      capturedStaff = c.get("staff");
+      return c.json({ ok: true });
+    });
+
+    const res = await app.request("/test");
+    expect(res.status).toBe(200);
+    expect(capturedStaff).not.toBeNull();
+    expect(capturedStaff!.role).toBe("groomer");
+    expect(capturedStaff!.userId).toBe("ba-user-new");
+    expect(capturedStaff!.name).toBe("New User");
+    expect(capturedStaff!.email).toBe("newuser@example.com");
+    expect(capturedStaff!.isSuperUser).toBe(false);
+  });
+
+  it("auto-provision: falls back to email prefix when user has no name", async () => {
+    staffLookupResult = null;
+    userLookupResult = { id: "ba-user-noname", name: null, email: "firstlogin@example.com" };
+    let capturedStaff: StaffRow | null = null;
+    const app = buildApp(resolveStaffMiddleware, (c) => {
+      capturedStaff = c.get("staff");
+      return c.json({ ok: true });
+    });
+
+    const res = await app.request("/test");
+    expect(res.status).toBe(200);
+    expect(capturedStaff!.name).toBe("firstlogin");
+  });
+
+  it("auto-provision: returns 403 when no staff record and no Better-Auth user exists", async () => {
+    staffLookupResult = null;
+    userLookupResult = null;
+    const app = buildApp(resolveStaffMiddleware);
+
+    const res = await app.request("/test");
+    expect(res.status).toBe(403);
+    const body = await res.json();
+    expect(body.error).toMatch(/no staff record found for authenticated user/i);
+  });
 });
 
 // ─── requireRole tests ────────────────────────────────────────────────────────