diff --git a/packages/web/src/lib/workspace.ts b/packages/web/src/lib/workspace.ts
index 070c6fd8..83f21ebf 100644
--- a/packages/web/src/lib/workspace.ts
+++ b/packages/web/src/lib/workspace.ts
@@ -13,7 +13,7 @@ import {
 	useQuery,
 	useQueryClient,
 } from "@tanstack/react-query";
-import { useParams } from "@tanstack/react-router";
+import { useNavigate, useParams } from "@tanstack/react-router";
 import { Effect, Schema } from "effect";
 import { useSyncExternalStore } from "react";
 import { client } from "@/api.ts";
@@ -189,17 +189,29 @@ export function useCancelWorkspaceInvitation(workspaceId: string) {
 }
 
 /**
- * Leaving takes the whole client with it: every pod, agent and conversation on
- * screen belonged to a workspace this person is no longer in, so the cache is
- * cleared rather than refetched.
+ * Leaving takes the workspace out of the client rather than refetching it: the
+ * API answers anything asked about it with a 403 once this person is gone.
+ *
+ * Like deleting, the workspace leaves the list at once and `/` opens another,
+ * or onboarding when there is none. Once its screens have closed, what is
+ * cached under its id goes too. Pods and conversations are cached by their own
+ * ids, so theirs expires unread with the cache's `gcTime` instead.
  */
 export function useLeaveWorkspace(workspaceId: string) {
 	const queries = useQueryClient();
+	const navigate = useNavigate();
 	return useMutation({
 		mutationFn: () =>
 			Effect.runPromise(client.api.workspaces.leave({ params: { workspace: workspaceId } })),
 		onSuccess: async () => {
-			await queries.invalidateQueries();
+			queries.setQueryData(workspacesQuery.queryKey, (workspaces) =>
+				workspaces?.filter((workspace) => workspace.id !== workspaceId),
+			);
+			await navigate({ to: "/", replace: true });
+			queries.removeQueries({
+				type: "inactive",
+				predicate: (query) => query.queryKey.includes(workspaceId),
+			});
 		},
 	});
 }
diff --git a/packages/web/src/shell/shell.test.tsx b/packages/web/src/shell/shell.test.tsx
index 7669fd39..ab13282a 100644
--- a/packages/web/src/shell/shell.test.tsx
+++ b/packages/web/src/shell/shell.test.tsx
@@ -2066,6 +2066,29 @@ describe("workspace settings", () => {
 		});
 	});
 
+	it("opens another workspace once you leave, asking nothing more of the one you left", async () => {
+		const other = { ...workspace, id: "0199a3a0-0000-7000-8000-0000000000f9", slug: "nitric" };
+		client.api.workspaces.list.mockReturnValue(Effect.succeed([workspace, other]));
+		client.api.workspaces.leave.mockImplementation(() => {
+			client.api.workspaces.list.mockReturnValue(Effect.succeed([other]));
+			client.api.pods.list.mockClear();
+			client.api.workspaceAccess.mockClear();
+			return Effect.void;
+		});
+		const router = mount(samPage);
+
+		fireEvent.click(await screen.findByRole("button", { name: "Leave workspace" }));
+		await screen.findByRole("heading", { name: "Leave this workspace?" });
+		fireEvent.click(screen.getByRole("button", { name: "Leave" }));
+
+		await waitFor(() => expect(router.state.location.pathname).toMatch(/^\/nitric\//));
+		const askedOfTheLeftWorkspace = [
+			...client.api.pods.list.mock.calls,
+			...client.api.workspaceAccess.mock.calls,
+		].filter(([request]) => request.params.workspace === workspace.id);
+		expect(askedOfTheLeftWorkspace).toEqual([]);
+	});
+
 	it("lists an invitation that has not been accepted, and can withdraw it", async () => {
 		mount("/suga/settings/members");