diff --git a/backend/oauth_connect.json b/backend/oauth_connect.json
index cb874eb2c7..3f8c265a4a 100644
--- a/backend/oauth_connect.json
+++ b/backend/oauth_connect.json
@@ -29,6 +29,10 @@
     "auth_url": "https://accounts.google.com/o/oauth2/v2/auth",
     "token_url": "https://oauth2.googleapis.com/token",
     "scopes": ["https://www.googleapis.com/auth/spreadsheets"],
+    "scope_options": [
+      "https://www.googleapis.com/auth/spreadsheets",
+      "https://www.googleapis.com/auth/spreadsheets.readonly"
+    ],
     "extra_params": {
       "access_type": "offline",
       "prompt": "consent"
@@ -38,6 +42,11 @@
     "auth_url": "https://accounts.google.com/o/oauth2/v2/auth",
     "token_url": "https://oauth2.googleapis.com/token",
     "scopes": ["https://www.googleapis.com/auth/drive"],
+    "scope_options": [
+      "https://www.googleapis.com/auth/drive.file",
+      "https://www.googleapis.com/auth/drive.readonly",
+      "https://www.googleapis.com/auth/drive"
+    ],
     "extra_params": {
       "access_type": "offline",
       "prompt": "consent"
@@ -47,6 +56,13 @@
     "auth_url": "https://accounts.google.com/o/oauth2/v2/auth",
     "token_url": "https://oauth2.googleapis.com/token",
     "scopes": ["https://www.googleapis.com/auth/gmail.send"],
+    "scope_options": [
+      "https://www.googleapis.com/auth/gmail.send",
+      "https://www.googleapis.com/auth/gmail.readonly",
+      "https://www.googleapis.com/auth/gmail.compose",
+      "https://www.googleapis.com/auth/gmail.modify",
+      "https://www.googleapis.com/auth/gmail.labels"
+    ],
     "extra_params": {
       "access_type": "offline",
       "prompt": "consent"
@@ -56,6 +72,12 @@
     "auth_url": "https://accounts.google.com/o/oauth2/v2/auth",
     "token_url": "https://oauth2.googleapis.com/token",
     "scopes": ["https://www.googleapis.com/auth/calendar.events"],
+    "scope_options": [
+      "https://www.googleapis.com/auth/calendar.events",
+      "https://www.googleapis.com/auth/calendar.events.readonly",
+      "https://www.googleapis.com/auth/calendar.readonly",
+      "https://www.googleapis.com/auth/calendar"
+    ],
     "extra_params": {
       "access_type": "offline",
       "prompt": "consent"
@@ -65,6 +87,12 @@
     "auth_url": "https://accounts.google.com/o/oauth2/v2/auth",
     "token_url": "https://oauth2.googleapis.com/token",
     "scopes": ["https://www.googleapis.com/auth/forms"],
+    "scope_options": [
+      "https://www.googleapis.com/auth/forms",
+      "https://www.googleapis.com/auth/forms.body",
+      "https://www.googleapis.com/auth/forms.body.readonly",
+      "https://www.googleapis.com/auth/forms.responses.readonly"
+    ],
     "extra_params": {
       "access_type": "offline",
       "prompt": "consent"
@@ -74,6 +102,10 @@
     "auth_url": "https://accounts.google.com/o/oauth2/v2/auth",
     "token_url": "https://oauth2.googleapis.com/token",
     "scopes": ["https://www.googleapis.com/auth/cloud-platform"],
+    "scope_options": [
+      "https://www.googleapis.com/auth/cloud-platform",
+      "https://www.googleapis.com/auth/cloud-platform.read-only"
+    ],
     "extra_params": {
       "access_type": "offline",
       "prompt": "consent"
@@ -88,6 +120,15 @@
       "https://www.googleapis.com/auth/admin.directory.user.security",
       "https://www.googleapis.com/auth/admin.directory.orgunit"
     ],
+    "scope_options": [
+      "https://www.googleapis.com/auth/admin.directory.user",
+      "https://www.googleapis.com/auth/admin.directory.user.readonly",
+      "https://www.googleapis.com/auth/admin.directory.group",
+      "https://www.googleapis.com/auth/admin.directory.group.readonly",
+      "https://www.googleapis.com/auth/admin.directory.orgunit",
+      "https://www.googleapis.com/auth/admin.directory.orgunit.readonly",
+      "https://www.googleapis.com/auth/admin.directory.user.security"
+    ],
     "extra_params": {
       "access_type": "offline",
       "prompt": "consent"
diff --git a/backend/windmill-oauth/src/lib.rs b/backend/windmill-oauth/src/lib.rs
index 2650b68b4d..32fde93b81 100644
--- a/backend/windmill-oauth/src/lib.rs
+++ b/backend/windmill-oauth/src/lib.rs
@@ -88,6 +88,8 @@ pub struct OAuthConfig {
     #[serde(default = "empty_string")]
     pub token_url: String,
     pub userinfo_url: Option<String>,
+    /// The registry JSON may also carry `scope_options`, a frontend-only pick
+    /// list for the connect dialog; it is deliberately not modelled here.
     pub scopes: Option<Vec<String>>,
     /// Default scopes for the client-credentials (2-legged) flow. These differ
     /// from the authorization-code `scopes` for most providers (member/consent
diff --git a/frontend/src/lib/components/AppConnectInner.svelte b/frontend/src/lib/components/AppConnectInner.svelte
index 3d73cea72f..320b3e36dd 100644
--- a/frontend/src/lib/components/AppConnectInner.svelte
+++ b/frontend/src/lib/components/AppConnectInner.svelte
@@ -1476,7 +1476,7 @@
 					>
 
 					{#if editScopes}
-						<OauthScopes bind:scopes />
+						<OauthScopes bind:scopes options={registryEntry()?.scope_options} />
 					{:else}
 						<div class="flex flex-col gap-1">
 							{#each scopes as scope}
diff --git a/frontend/src/lib/components/OauthScopes.svelte b/frontend/src/lib/components/OauthScopes.svelte
index 4ec17c6e2a..b9018bfe3b 100644
--- a/frontend/src/lib/components/OauthScopes.svelte
+++ b/frontend/src/lib/components/OauthScopes.svelte
@@ -1,51 +1,114 @@
 <script lang="ts">
 	import { Button } from './common'
+	import TextInput from './text_input/TextInput.svelte'
+	import Checkbox from './common/checkbox/Checkbox.svelte'
 	import { Minus, Plus } from 'lucide-svelte'
 
 	interface Props {
 		scopes?: string[]
+		/** Scopes the provider is known to accept, offered as checkboxes. Anything
+		 * not in this list stays editable as free text below them. */
+		options?: string[]
 	}
 
-	let { scopes = $bindable() }: Props = $props()
+	let { scopes = $bindable(), options = [] }: Props = $props()
+
+	// Ticked options and free-text rows are kept apart from `scopes` (the only
+	// value the parent binds) so a row can pass through an option's exact value
+	// while typing (`…/calendar` on the way to `…/calendar.acls`) without ticking
+	// or unticking anything. `lastWritten` tells a parent-side reset apart from
+	// the echo of our own write.
+	let ticked: string[] = $state([])
+	let custom: string[] = $state([])
+	let lastWritten: string | undefined = undefined
 
 	$effect.pre(() => {
 		if (!scopes) {
 			scopes = []
 		}
+		const json = JSON.stringify([scopes, options])
+		if (json != lastWritten) {
+			lastWritten = json
+			ticked = scopes.filter((v) => options.includes(v))
+			custom = scopes.filter((v) => !options.includes(v))
+		}
 	})
+
+	function write(nextTicked: string[], rows: string[]) {
+		ticked = nextTicked
+		custom = rows
+		scopes = [...nextTicked.filter((o) => !rows.includes(o)), ...rows]
+		lastWritten = JSON.stringify([scopes, options])
+	}
+
+	// Ticking an option absorbs a free-text row holding the same value. The
+	// target state comes from `ticked`, not the DOM: `Checkbox` re-asserts its
+	// `checked` prop on every click, so the input already reads the old value
+	// again by the time `change` fires.
+	function toggle(option: string, on: boolean) {
+		const rest = ticked.filter((o) => o != option)
+		write(on ? [...rest, option] : rest, on ? custom.filter((r) => r != option) : custom)
+	}
+
+	function setRow(i: number, value: string) {
+		const rows = [...custom]
+		rows[i] = value
+		write(ticked, rows)
+	}
 </script>
 
-{#if scopes && Array.isArray(scopes)}
-	{#each scopes as v, i}
-		<div class="flex flex-row max-w-md mb-2">
-			<input type="text" bind:value={scopes[i]} />
-			<Button
-				variant="default"
-				size="xs"
-				btnClasses="mx-6"
-				on:click={() => {
-					scopes = scopes?.filter((el) => el != v)
-				}}
-				startIcon={{ icon: Minus }}
-				iconOnly
-			/>
-		</div>
-	{/each}
+{#if options.length > 0}
+	<div class="flex flex-col gap-1 mb-2">
+		{#each options as option (option)}
+			<label class="flex items-center gap-2 text-xs">
+				<Checkbox
+					checked={ticked.includes(option)}
+					onChange={() => toggle(option, !ticked.includes(option))}
+				/>
+				<span class="font-mono break-all">{option}</span>
+			</label>
+		{/each}
+	</div>
+	<span class="text-xs text-secondary">Custom scopes</span>
 {/if}
 
+{#each custom as v, i (i)}
+	<div class="flex flex-row max-w-md mb-2">
+		<TextInput
+			value={v}
+			size="sm"
+			inputProps={{ oninput: (e) => setRow(i, e.currentTarget.value) }}
+		/>
+		<Button
+			variant="default"
+			unifiedSize="sm"
+			btnClasses="mx-6"
+			onclick={() => {
+				write(
+					ticked,
+					custom.filter((_, j) => j != i)
+				)
+			}}
+			startIcon={{ icon: Minus }}
+			iconOnly
+		/>
+	</div>
+{/each}
+
 <div class="flex items-center mt-1">
 	<Button
 		variant="default"
-		hover="yo"
-		size="xs"
+		unifiedSize="sm"
 		startIcon={{ icon: Plus }}
-		on:click={() => {
-			scopes = (scopes ?? []).concat('')
+		onclick={() => {
+			write(ticked, [...custom, ''])
 		}}
 	>
 		Add item
 	</Button>
-	<span class="ml-2 text-xs text-primary font-normal">
-		({(scopes ?? []).length} item{(scopes ?? []).length > 1 ? 's' : ''})
-	</span>
+	{#if custom.length > 0}
+		<span class="ml-2 text-xs text-primary font-normal">
+			({custom.length} item{custom.length > 1 ? 's' : ''})
+		</span>
+	{/if}
 </div>