diff --git a/.changeset/remove-legacy-register-flow.md b/.changeset/remove-legacy-register-flow.md
new file mode 100644
index 00000000000..7d03565fe72
--- /dev/null
+++ b/.changeset/remove-legacy-register-flow.md
@@ -0,0 +1,5 @@
+---
+"dashboard": patch
+---
+
+Removed the legacy session-aware `/register` compatibility flow. Stale links now redirect directly to `/sign-up`.
diff --git a/client/dashboard/src/components/page-templates/centered-page.tsx b/client/dashboard/src/components/page-templates/centered-page.tsx
index 430e51d3dd8..50dac89d678 100644
--- a/client/dashboard/src/components/page-templates/centered-page.tsx
+++ b/client/dashboard/src/components/page-templates/centered-page.tsx
@@ -1,6 +1,6 @@
 /**
  * CenteredPage — the shell for full-viewport, standalone pages rendered outside
- * the main app layout: auth (login/register/signup), demo redirects, access
+ * the main app layout: auth (login/signup), demo redirects, access
  * requests, not-found, policy acknowledgements.
  *
  * These already share two shells; this names them as the canonical choice so a
diff --git a/client/dashboard/src/pages/login/Register.test.tsx b/client/dashboard/src/pages/login/Register.test.tsx
deleted file mode 100644
index caffeea86f0..00000000000
--- a/client/dashboard/src/pages/login/Register.test.tsx
+++ /dev/null
@@ -1,104 +0,0 @@
-import { cleanup, render, screen } from "@testing-library/react";
-import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
-
-import Register from "./Register";
-
-const mocks = vi.hoisted(() => ({
-  useSearchParams: vi.fn(),
-  useSession: vi.fn(),
-}));
-
-vi.mock("@/contexts/Auth", () => ({ useSession: mocks.useSession }));
-vi.mock("react-router", () => ({
-  Navigate: ({ to }: { to: string }) => (
-    <div data-testid="navigate" data-to={to} />
-  ),
-  useSearchParams: mocks.useSearchParams,
-}));
-function renderAt(path: string) {
-  const [, search = ""] = path.split("?");
-  mocks.useSearchParams.mockReturnValue([new URLSearchParams(search), vi.fn()]);
-  render(<Register />);
-}
-
-let originalLocation: Location | undefined;
-
-beforeEach(() => {
-  originalLocation = window.location;
-  // @ts-expect-error test-only location replacement for same-origin URL parsing
-  delete window.location;
-  Object.defineProperty(window, "location", {
-    configurable: true,
-    value: { origin: "https://app.example" },
-  });
-});
-
-afterEach(() => {
-  cleanup();
-  if (originalLocation) {
-    Object.defineProperty(window, "location", {
-      configurable: true,
-      value: originalLocation,
-    });
-  }
-  vi.clearAllMocks();
-});
-
-describe("Register", () => {
-  it("redirects logged-out /register traffic to /sign-up", () => {
-    mocks.useSession.mockReturnValue({ session: "", activeOrganizationId: "" });
-
-    renderAt("/register?redirect=%2Fcli%2Fcallback");
-
-    expect(screen.getByTestId("navigate").getAttribute("data-to")).toBe(
-      "/sign-up?redirect=https%3A%2F%2Fapp.example%2Fcli%2Fcallback",
-    );
-  });
-
-  it("preserves assistants disposition", () => {
-    mocks.useSession.mockReturnValue({ session: "", activeOrganizationId: "" });
-
-    renderAt("/register?disposition=assistants");
-
-    expect(screen.getByTestId("navigate").getAttribute("data-to")).toBe(
-      "/login?disposition=assistants",
-    );
-  });
-
-  it("drops an external legacy redirect", () => {
-    mocks.useSession.mockReturnValue({ session: "", activeOrganizationId: "" });
-
-    renderAt("/register?redirect=https%3A%2F%2Fevil.example");
-
-    expect(screen.getByTestId("navigate").getAttribute("data-to")).toBe(
-      "/sign-up",
-    );
-  });
-
-  it("redirects an authenticated session with an organization to the root", () => {
-    mocks.useSession.mockReturnValue({
-      session: "<SESSION>",
-      activeOrganizationId: "<ORG_ID>",
-    });
-
-    renderAt("/register");
-
-    expect(screen.getByTestId("navigate").getAttribute("data-to")).toBe("/");
-    expect(screen.queryByTestId("register-panel")).toBeNull();
-  });
-
-  it("preserves the path, search, and hash for an authenticated redirect", () => {
-    mocks.useSession.mockReturnValue({
-      session: "<SESSION>",
-      activeOrganizationId: "<ORG_ID>",
-    });
-
-    renderAt(
-      "/register?redirect=https%3A%2F%2Fapp.example%2Fprojects%2Fdefault%3Ftab%3Dtools%23details",
-    );
-
-    expect(screen.getByTestId("navigate").getAttribute("data-to")).toBe(
-      "/projects/default?tab=tools#details",
-    );
-  });
-});
diff --git a/client/dashboard/src/pages/login/Register.tsx b/client/dashboard/src/pages/login/Register.tsx
deleted file mode 100644
index 019cd0d2e3b..00000000000
--- a/client/dashboard/src/pages/login/Register.tsx
+++ /dev/null
@@ -1,30 +0,0 @@
-import { useSession } from "@/contexts/Auth";
-import { safeSameOriginPath, safeSameOriginUrl } from "@/lib/safe-external-url";
-import { Navigate, useSearchParams } from "react-router";
-
-export default function Register(): JSX.Element {
-  const session = useSession();
-  const [searchParams] = useSearchParams();
-
-  const disposition = searchParams.get("disposition");
-  if (disposition === "assistants") {
-    return (
-      <Navigate
-        to={`/login?disposition=${encodeURIComponent(disposition)}`}
-        replace
-      />
-    );
-  }
-
-  const rawRedirect = searchParams.get("redirect");
-  const redirect = safeSameOriginUrl(rawRedirect);
-  const signUpTarget = redirect
-    ? "/sign-up?redirect=" + encodeURIComponent(redirect)
-    : "/sign-up";
-
-  if (session.session === "" || session.activeOrganizationId === "") {
-    return <Navigate to={signUpTarget} replace />;
-  }
-
-  return <Navigate to={safeSameOriginPath(rawRedirect) ?? "/"} replace />;
-}
diff --git a/client/dashboard/src/pages/login/components/terms-footer.tsx b/client/dashboard/src/pages/login/components/terms-footer.tsx
index b167602edad..e15fc620e09 100644
--- a/client/dashboard/src/pages/login/components/terms-footer.tsx
+++ b/client/dashboard/src/pages/login/components/terms-footer.tsx
@@ -1,6 +1,6 @@
 import { cn } from "@/lib/utils";
 
-// Legal footer shared by every auth surface (login/register shell and the
+// Legal footer shared by every auth surface (login/signup shell and the
 // demo-gate AuthLayout) so the links and copy stay in one place.
 export function TermsFooter({
   className,
diff --git a/client/dashboard/src/routes.tsx b/client/dashboard/src/routes.tsx
index 5b1807fe5e4..83f3e8ae898 100644
--- a/client/dashboard/src/routes.tsx
+++ b/client/dashboard/src/routes.tsx
@@ -1,7 +1,7 @@
 import { Icon, IconProps } from "@/components/ui/Icon";
 import { IconName } from "@/components/ui/Icon/names";
 import React, { useMemo } from "react";
-import { Link, useLocation, useNavigate } from "react-router";
+import { Link, Navigate, useLocation, useNavigate } from "react-router";
 import { ReleaseStage } from "./components/release-stage-badge";
 import { useSlugs } from "./contexts/Sdk";
 import { cn } from "./lib/utils";
@@ -42,7 +42,6 @@ import Home from "./pages/home/Home";
 import { ProjectGuidePage } from "./components/project-guide/ProjectGuidePage";
 import Integrations from "./pages/integrations/Integrations";
 import Login from "./pages/login/Login";
-import Register from "./pages/login/Register";
 import ExploreDemo from "./pages/demo/ExploreDemo";
 import SignUp from "./pages/login/SignUp";
 import { LogsRoot } from "./pages/logs/Logs";
@@ -236,7 +235,7 @@ const ROUTE_STRUCTURE = {
   register: {
     title: "Register",
     url: "/register",
-    component: Register,
+    component: () => <Navigate to="/sign-up" replace />,
     unauthenticated: true,
   },
   exploreDemo: {