fix: read the MCP URL policy when a URL is asked for, and drop the all-workspaces option

Two review findings on the token drawer:

The policy was read once per page load and cached for the browser session, so a
superadmin turning the setting on left every open tab handing out `?token=` URLs
the server now refuses. Both entry points now read it when the user actually asks
for an MCP URL: when MCP mode is entered, and when the connect drawer opens.

The workspace picker offered "All workspaces / Multi-workspace", but the gateway's
consent screen binds the token it issues to the one workspace picked there, so
OAuth has no multi-workspace grant to hand out. That entry is now token-only.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

frontend/src/lib/components/home/HomeConnectDrawer.svelte

@@ -6,7 +6,6 @@
 	import { Bot, ExternalLink, Terminal } from 'lucide-svelte'
 	import { shell } from 'svelte-highlight/languages'
 	import { mcpTokenUrlDisabled } from '$lib/mcpAuth'
-	import { onMount } from 'svelte'
 
 	type ConnectTab = 'cli' | 'mcp'
 
@@ -22,15 +21,12 @@ wmill workspace add ${workspaceId} ${workspaceId} ${origin}
 wmill init
 wmill sync pull`)
 
-	onMount(async () => {
-		tokenUrlDisabled = await mcpTokenUrlDisabled()
-	})
-
 	function noop() {}
 
 	export function openDrawer(tab: ConnectTab = 'cli') {
 		selectedTab = tab
 		openVersion += 1
+		void mcpTokenUrlDisabled().then((v) => (tokenUrlDisabled = v))
 		drawer?.openDrawer()
 	}
 

frontend/src/lib/components/settings/CreateToken.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { onMount, untrack } from 'svelte'
+	import { untrack } from 'svelte'
 	import { userWorkspaces, workspaceStore, type UserWorkspace } from '$lib/stores'
 	import { Alert, Button } from '../common'
 	import { triggerableByAI } from '$lib/actions/triggerableByAI.svelte'
@@ -75,6 +75,7 @@
 
 	function enterMcpMode() {
 		mcpCreationMode = true
+		void mcpTokenUrlDisabled().then((v) => (tokenUrlDisabled = v))
 		newTokenExpiration = undefined
 		newTokenWorkspace = defaultNewTokenWorkspace ?? $workspaceStore
 		newToken = undefined
@@ -157,12 +158,6 @@
 	)
 	const mcpBaseUrl = $derived(`${mcpUrl}?token=`)
 
-	onMount(async () => {
-		if (showMcpMode || mcpOnly || openWithMcpMode) {
-			tokenUrlDisabled = await mcpTokenUrlDisabled()
-		}
-	})
-
 	$effect(() => {
 		const requestedMcpMode = mcpOnly || openWithMcpMode
 		if (requestedMcpMode === lastRequestedMcpMode) {
@@ -225,16 +220,11 @@
 			{#if !lockWorkspace}
 				<div class="mb-4 max-w-md">
 					<span class="block mb-1 text-emphasis text-xs font-semibold">Workspace</span>
+					<!-- No all-workspaces entry: the gateway's consent screen binds the token it issues
+					     to the one workspace picked there, so OAuth has no multi-workspace grant to offer. -->
 					<Select
 						bind:value={newTokenWorkspace}
-						items={[
-							{
-								label: 'All workspaces',
-								value: ALL_WORKSPACES,
-								subtitle: 'Multi-workspace'
-							},
-							...workspaces.map((w) => ({ label: w.name, value: w.id, subtitle: w.id }))
-						]}
+						items={workspaces.map((w) => ({ label: w.name, value: w.id, subtitle: w.id }))}
 					/>
 				</div>
 			{/if}

frontend/src/lib/mcpAuth.ts

@@ -1,20 +1,22 @@
 import { SettingService } from '$lib/gen'
 
-let cached: Promise<boolean> | undefined
-
 /**
  * Whether the instance refuses `?token=` on the MCP endpoints. When it does, an MCP URL is
  * handed over bare and the client reaches it by completing the OAuth flow, so nothing in the
  * UI should offer to mint a token for one.
+ *
+ * Deliberately uncached: callers read it at the moment an MCP URL is asked for, so a superadmin
+ * flipping the setting does not leave open tabs handing out URLs the server now refuses.
  */
-export function mcpTokenUrlDisabled(): Promise<boolean> {
-	cached ??= SettingService.getGlobal({ key: 'mcp_disable_token_query_param' })
-		.then((v) => (v as boolean | null) ?? false)
-		.catch((err) => {
-			console.error('Failed to load the MCP token setting:', err)
-			// Retry on the next caller rather than pinning the fallback for the session.
-			cached = undefined
-			return false
-		})
-	return cached
+export async function mcpTokenUrlDisabled(): Promise<boolean> {
+	try {
+		return (
+			((await SettingService.getGlobal({
+				key: 'mcp_disable_token_query_param'
+			})) as boolean | null) ?? false
+		)
+	} catch (err) {
+		console.error('Failed to load the MCP token setting:', err)
+		return false
+	}
 }