diff --git a/tests/e2e/ui/tests/proxy-admin/teams.spec.ts b/tests/e2e/ui/tests/proxy-admin/teams.spec.ts
index 17ff62f37cf..b1f6a0bdbfe 100644
--- a/tests/e2e/ui/tests/proxy-admin/teams.spec.ts
+++ b/tests/e2e/ui/tests/proxy-admin/teams.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from "@playwright/test";
+import { test, expect, type Page as PlaywrightPage } from "@playwright/test";
 import {
   ADMIN_STORAGE_PATH,
   E2E_TEAM_CRUD_ID,
@@ -8,6 +8,22 @@ import {
 } from "../../constants";
 import { Page } from "../../fixtures/pages";
 import { navigateToPage, dismissFeedbackPopup, clickTeamId } from "../../helpers/navigation";
+import { readBack } from "../../helpers/roundTrip";
+
+/** GET /team/list returns a bare array of teams, each carrying team_alias/team_id. */
+async function findTeamByAlias(page: PlaywrightPage, alias: string): Promise<Record<string, any> | undefined> {
+  const teams = await readBack<Record<string, any>[]>(page, "/team/list");
+  return teams.find((team) => team.team_alias === alias);
+}
+
+/** GET /team/info nests the record under `team_info`; membership lives in members_with_roles. */
+async function teamMemberEmails(page: PlaywrightPage, teamId: string): Promise<string[]> {
+  const info = await readBack<{ team_info: { members_with_roles?: { user_email?: string }[] } }>(
+    page,
+    `/team/info?team_id=${encodeURIComponent(teamId)}`,
+  );
+  return (info.team_info.members_with_roles ?? []).map((member) => member.user_email ?? "").filter(Boolean);
+}
 
 test.describe("Proxy Admin - Teams", () => {
   test.use({ storageState: ADMIN_STORAGE_PATH });
@@ -42,6 +58,13 @@ test.describe("Proxy Admin - Teams", () => {
 
     // Verify success notification
     await expect(page.getByText("Team created").first()).toBeVisible({ timeout: 10_000 });
+
+    // "Team created" is the UI reporting on its own request. Confirm the team
+    // is really there, and that the models picked in the modal came with it --
+    // a create that drops its model selection still toasts success.
+    const created = await findTeamByAlias(page, uniqueAlias);
+    expect(created, `team ${uniqueAlias} readable from /team/list`).toBeTruthy();
+    expect(created?.models, "created team kept its model selection").toBeTruthy();
   });
 
   test("Invite a user to a team", async ({ page }) => {
@@ -71,6 +94,16 @@ test.describe("Proxy Admin - Teams", () => {
     await modal.getByRole("button", { name: /Add Member/i }).click();
 
     await expect(page.getByText(/member.*added|success/i).first()).toBeVisible({ timeout: 10_000 });
+
+    // Membership is the point of the flow, and the toast is matched loosely
+    // enough (/success/i) that almost any notification satisfies it. Confirm
+    // the user is actually on the team.
+    await expect
+      .poll(async () => await teamMemberEmails(page, E2E_TEAM_CRUD_ID), {
+        message: "invited user never appeared in the team's members",
+        timeout: 15_000,
+      })
+      .toContain("invitable@test.local");
   });
 
   test("Edit team member for team proxy admin does not belong to", async ({ page }) => {
@@ -106,6 +139,15 @@ test.describe("Proxy Admin - Teams", () => {
     await modal.getByRole("button", { name: /Force Delete|Delete/i }).click();
 
     await expect(teamRow).not.toBeVisible({ timeout: 10_000 });
+
+    // A row vanishing from the table is the client dropping it from local
+    // state; it happens whether or not the delete reached the database.
+    await expect
+      .poll(async () => await findTeamByAlias(page, E2E_TEAM_DELETE_ALIAS), {
+        message: `team ${E2E_TEAM_DELETE_ALIAS} still readable from /team/list after delete`,
+        timeout: 15_000,
+      })
+      .toBeUndefined();
   });
 
   test("Team in org - edit team member", async ({ page }) => {