@@ -127,6 +127,8 @@ Build order: **Tools** → **Block** → **Icon** → optional **Trigger**, star
 - **Tool IDs are `snake_case`** (`service_action`), registered in `tools/registry.ts`; blocks register in `blocks/registry-maps.ts` (`BLOCK_REGISTRY` + `BLOCK_META_REGISTRY`, alphabetically).
 - **Type coercions go in `tools.config.params`** (runs at execution, after variable resolution), never in `tools.config.tool` (runs at serialization, where `Number()` destroys dynamic `<Block.output>` references).
 
+A surface that lists integrations to a viewer (a catalog, picker, or `@` menu) reads `useIntegrationAccess` (`hooks/use-integration-access.ts`): the one verdict across permission group, deployment allowlist, and deployment OAuth configuration, which fails closed until the viewer's policy loads. Never map over a raw catalog (`INTEGRATIONS`, `listIntegrations()`, `INTEGRATION_METADATA`) there; `check:integration-access` fails the build.
+
 Remaining block/tool/trigger rules: `.claude/rules/sim-integrations.md`. Canvas sentences: `apps/sim/blocks/AGENTS.md`.
 
 ## Tables
 
@@ -127,6 +127,8 @@ Build order: **Tools** → **Block** → **Icon** → optional **Trigger**, star
 - **Tool IDs are `snake_case`** (`service_action`), registered in `tools/registry.ts`; blocks register in `blocks/registry-maps.ts` (`BLOCK_REGISTRY` + `BLOCK_META_REGISTRY`, alphabetically).
 - **Type coercions go in `tools.config.params`** (runs at execution, after variable resolution), never in `tools.config.tool` (runs at serialization, where `Number()` destroys dynamic `<Block.output>` references).
 
+A surface that lists integrations to a viewer (a catalog, picker, or `@` menu) reads `useIntegrationAccess` (`hooks/use-integration-access.ts`): the one verdict across permission group, deployment allowlist, and deployment OAuth configuration, which fails closed until the viewer's policy loads. Never map over a raw catalog (`INTEGRATIONS`, `listIntegrations()`, `INTEGRATION_METADATA`) there; `check:integration-access` fails the build.
+
 Remaining block/tool/trigger rules: `.claude/rules/sim-integrations.md`. Canvas sentences: `apps/sim/blocks/AGENTS.md`.
 
 ## Tables
 
@@ -1,4 +1,5 @@
 import { useMemo } from 'react'
+import { isIntegrationUsable } from '@/lib/integrations/access'
 import type { MentionMenuData } from '@/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/mention/mention-store'
 import { listIntegrations } from '@/blocks/integration-matcher'
 import { useKnowledgeBasesQuery } from '@/hooks/queries/kb/knowledge'
@@ -7,6 +8,7 @@ import { useTablesList } from '@/hooks/queries/tables'
 import { useWorkflows } from '@/hooks/queries/workflows'
 import { useWorkspaceFileFolders } from '@/hooks/queries/workspace-file-folders'
 import { useWorkspaceFilePickerOptions } from '@/hooks/queries/workspace-files'
+import { useIntegrationAccess } from '@/hooks/use-integration-access'
 import { mentionIcon } from './mention-icon'
 import type { MentionItem } from './types'
 
@@ -44,18 +46,21 @@ export function useMarkdownMentions(
   const knowledgeBases = useKnowledgeBasesQuery(ws, { enabled: active })
   const workflows = useWorkflows(ws)
   const skills = useSkills(wsStr)
+  const { getAccess: getIntegrationAccess } = useIntegrationAccess(workspaceId, { enabled: active })
 
-  // The integration registry is static — materialize it once rather than on every resource refetch.
+  // Rebuilt only when the access policy changes, never on a resource refetch.
   const integrationItems = useMemo<MentionItem[]>(() => {
     if (!active) return []
-    return listIntegrations().map((integration) => ({
-      kind: 'integration',
-      id: integration.blockType,
-      label: integration.name,
-      group: 'Integrations',
-      icon: mentionIcon('integration', integration.blockType),
-    }))
-  }, [active])
+    return listIntegrations()
+      .filter((integration) => isIntegrationUsable(getIntegrationAccess(integration.blockType)))
+      .map((integration) => ({
+        kind: 'integration',
+        id: integration.blockType,
+        label: integration.name,
+        group: 'Integrations',
+        icon: mentionIcon('integration', integration.blockType),
+      }))
+  }, [active, getIntegrationAccess])
 
   const items = useMemo(() => {
     if (!active) return NO_MENTION_ITEMS
 
@@ -1,6 +1,7 @@
 import { useMemo, useSyncExternalStore } from 'react'
 import { isBrowserAgentAvailable } from '@/lib/browser-agent/transport'
 import { subscribeDesktopPreferences } from '@/lib/desktop'
+import { isIntegrationUsable } from '@/lib/integrations/access'
 import { isTerminalAvailable } from '@/lib/terminal/transport'
 import type { AvailableItem } from '@/app/workspace/[workspaceId]/home/components/mothership-view/components/add-resource-dropdown/resource-folder-tree'
 import {
@@ -21,6 +22,7 @@ import { useWorkflowTests } from '@/hooks/queries/workflow-tests'
 import { useWorkflows } from '@/hooks/queries/workflows'
 import { useWorkspaceFileFolders } from '@/hooks/queries/workspace-file-folders'
 import { useWorkspaceFilePickerOptions } from '@/hooks/queries/workspace-files'
+import { useIntegrationAccess } from '@/hooks/use-integration-access'
 
 /**
  * Placeholder id for the Browser launcher row. It never names a resource: the
@@ -178,6 +180,23 @@ export function useAvailableResources(
   const { data: tasks, isPending: tasksPending } = useMothershipChats(workspaceId, {
     enabled: enabled && Boolean(workspaceId),
   })
+  const integrationsIncluded = !excludeTypes?.includes('integration')
+  const integrationAccess = useIntegrationAccess(workspaceId, {
+    enabled: enabled && integrationsIncluded,
+  })
+  const { getAccess: getIntegrationAccess } = integrationAccess
+
+  /**
+   * Only integrations the workspace can use now: the server drops a mention of
+   * one its policy restricts or whose OAuth this deployment has not configured.
+   */
+  const usableIntegrations = useMemo(
+    () =>
+      listIntegrationsByPopularity().filter((integration) =>
+        isIntegrationUsable(getIntegrationAccess(integration.blockType))
+      ),
+    [getIntegrationAccess]
+  )
   const { data: logsData, isPending: logsPending } = useLogsList(
     workspaceId,
     LOG_DROPDOWN_FILTERS,
@@ -208,7 +227,8 @@ export function useAvailableResources(
           (!excludeTypes?.includes('knowledgebase') && knowledgeBaseFoldersPending))) ||
       fileFoldersPending ||
       tasksPending ||
-      logsPending)
+      logsPending ||
+      (integrationsIncluded && integrationAccess.isPending))
 
   const groups = useMemo(() => {
     if (!enabled) return NO_RESOURCE_GROUPS
@@ -279,7 +299,7 @@ export function useAvailableResources(
       },
       {
         type: 'integration' as const,
-        items: listIntegrationsByPopularity().map((integration) => ({
+        items: usableIntegrations.map((integration) => ({
           id: integration.blockType,
           name: integration.name,
           iconComponent: integration.icon,
@@ -355,6 +375,7 @@ export function useAvailableResources(
     knowledgeBases,
     tasks,
     logs,
+    usableIntegrations,
     excludeTypes,
     dashboardsEnabled,
     testsEnabled,
 
@@ -33,6 +33,32 @@ describe('organization mention inventory', () => {
     expect(result.groups[1].items).toEqual([{ id: 'slack', name: 'Slack' }])
     expect(result.isHydrating).toBe(false)
   })
+  it('offers an integration only when every workspace policy permits it', () => {
+    const withIntegrations = (ids: string[]) => ({
+      ...inventory,
+      groups: [{ type: 'integration' as const, items: ids.map((id) => ({ id, name: id })) }],
+    })
+    const result = mergeOrganizationResourceInventories(
+      [
+        { id: 'sales', name: 'Sales' },
+        { id: 'finance', name: 'Finance' },
+      ],
+      { sales: withIntegrations(['slack', 'gmail_v2']), finance: withIntegrations(['gmail_v2']) }
+    )
+    expect(result.groups).toEqual([
+      { type: 'integration', items: [{ id: 'gmail_v2', name: 'gmail_v2' }] },
+    ])
+  })
+  it('offers no integration while a workspace policy has not arrived', () => {
+    const result = mergeOrganizationResourceInventories(
+      [
+        { id: 'sales', name: 'Sales' },
+        { id: 'finance', name: 'Finance' },
+      ],
+      { sales: inventory }
+    )
+    expect(result.groups.find((group) => group.type === 'integration')?.items ?? []).toEqual([])
+  })
   it('keeps mention confirmation pending until every accessible workspace settles', () => {
     expect(
       mergeOrganizationResourceInventories([{ id: 'sales', name: 'Sales' }], {}).isHydrating
 
@@ -37,10 +37,12 @@ export function mergeOrganizationResourceInventories(
   const byType = new Map<string, AvailableResources['groups'][number]>()
   const structureFolders: AvailableResources['structureFolders'] = { table: [], knowledgebase: [] }
   let isHydrating = false
+  let isAnyInventoryMissing = false
   for (const workspace of workspaces) {
     const inventory = inventories[workspace.id]
     if (!inventory) {
       isHydrating = true
+      isAnyInventoryMissing = true
       continue
     }
     isHydrating ||= inventory.isHydrating
@@ -51,8 +53,15 @@ export function mergeOrganizationResourceInventories(
     })
     for (const group of inventory.groups) {
       if (group.type === 'browser' || group.type === 'terminal') continue
-      // Integration definitions are global and do not belong to a workspace.
-      if (group.type === 'integration' && byType.has(group.type)) continue
+      // Integrations are not workspace-owned, but a permission group can target
+      // individual workspaces, so one is offered only where every workspace permits it,
+      // and a workspace whose inventory has not arrived permits nothing yet.
+      const integrations = group.type === 'integration' ? byType.get(group.type) : undefined
+      if (integrations) {
+        const permittedHere = new Set(group.items.map((item) => item.id))
+        integrations.items = integrations.items.filter((item) => permittedHere.has(item.id))
+        continue
+      }
       let target = byType.get(group.type)
       if (!target) {
         target = { type: group.type, items: [] }
@@ -64,5 +73,7 @@ export function mergeOrganizationResourceInventories(
     structureFolders.table.push(...inventory.structureFolders.table.map(owned))
     structureFolders.knowledgebase.push(...inventory.structureFolders.knowledgebase.map(owned))
   }
+  const integrations = byType.get('integration')
+  if (integrations && isAnyInventoryMissing) integrations.items = []
   return { groups, structureFolders, isHydrating }
 }
@@ -1,10 +1,11 @@
 'use client'
 
-import { useEffect, useMemo, useRef, useState } from 'react'
+import { type ReactNode, useEffect, useMemo, useRef, useState } from 'react'
 import { Chip, ChipDropdown, ChipLink, cn } from '@sim/emcn'
 import { ArrowLeft, Plus } from '@sim/emcn/icons'
 import { useRouter } from 'next/navigation'
 import { useQueryState } from 'nuqs'
+import { EmptyState } from '@/components/empty-state/empty-state'
 import { HEADER_ACTION_CLUSTER, PAGE_HEADER_BAR } from '@/components/page-header-bar'
 import { useDeploymentShape } from '@/lib/core/config/deployment-shape'
 import {
@@ -13,9 +14,11 @@ import {
   resolveCredentialDisplay,
   resolveOAuthServiceForIntegration,
 } from '@/lib/integrations'
+import { isIntegrationPermitted } from '@/lib/integrations/access'
 import { credentialProviderMatchesService } from '@/lib/oauth'
 import { ConnectOAuthModal } from '@/app/workspace/[workspaceId]/components/connect-oauth-modal'
 import { RESOURCE_TILE_BASE } from '@/app/workspace/[workspaceId]/components/resource-tile'
+import { IntegrationBlockDetailFallback } from '@/app/workspace/[workspaceId]/integrations/[block]/integration-block-detail-fallback'
 import { IntegrationSkillsSection } from '@/app/workspace/[workspaceId]/integrations/[block]/integration-skills-section'
 import { connectParam } from '@/app/workspace/[workspaceId]/integrations/[block]/search-params'
 import { ConnectPersonalTokenModal } from '@/app/workspace/[workspaceId]/integrations/components/connect-personal-token-modal'
@@ -42,7 +45,10 @@ import {
   getTemplatesForBlock,
   type ScopedBlockTemplate,
 } from '@/blocks/registry'
+import { useWorkspaceAccessRequestFeatures } from '@/ee/access-requests/components/permission-access-boundary'
+import { RequestAccessAction } from '@/ee/access-requests/components/request-access-action'
 import { useWorkspaceCredentials } from '@/hooks/queries/credentials'
+import { useIntegrationAccess } from '@/hooks/use-integration-access'
 import { useOAuthReturnRouter } from '@/hooks/use-oauth-return'
 import { usePermissionConfig } from '@/hooks/use-permission-config'
 
@@ -60,7 +66,84 @@ interface IntegrationBlockDetailProps {
   workspaceId: string
 }
 
+/**
+ * Integration detail page, shown only when the viewer's access policy permits
+ * the integration (an unconfigured one included, which the page presents as
+ * unavailable). A direct link to a restricted one renders an access-required
+ * state instead of the connect actions, and nothing renders until the policy
+ * has loaded.
+ */
 export function IntegrationBlockDetail({ integration, workspaceId }: IntegrationBlockDetailProps) {
+  const { getAccess, availabilityError, refetchAvailability } = useIntegrationAccess(workspaceId)
+  const accessRequests = useWorkspaceAccessRequestFeatures()
+  const access = getAccess(integration.type)
+
+  if (availabilityError) {
+    return (
+      <IntegrationAccessNotice
+        workspaceId={workspaceId}
+        title='Unable to check access'
+        description={availabilityError.message}
+        action={<Chip onClick={() => void refetchAvailability()}>Try again</Chip>}
+      />
+    )
+  }
+  if (access === undefined) return <IntegrationBlockDetailFallback workspaceId={workspaceId} />
+  if (isIntegrationPermitted(access)) {
+    return <IntegrationBlockDetailContent integration={integration} workspaceId={workspaceId} />
+  }
+
+  const requestable = access === 'requestable' && accessRequests.data?.enabled === true
+
+  return (
+    <IntegrationAccessNotice
+      workspaceId={workspaceId}
+      title='Access required'
+      description={
+        requestable
+          ? 'Ask an administrator for access.'
+          : 'Your organization restricts this integration.'
+      }
+      action={
+        requestable ? (
+          <RequestAccessAction
+            scope={{ kind: 'workspace', workspaceId }}
+            target={{ kind: 'integration', id: integration.type }}
+            label={integration.name}
+            variant='primary'
+          />
+        ) : undefined
+      }
+    />
+  )
+}
+
+interface IntegrationAccessNoticeProps {
+  workspaceId: string
+  title: string
+  description: string
+  action?: ReactNode
+}
+
+function IntegrationAccessNotice({
+  workspaceId,
+  title,
+  description,
+  action,
+}: IntegrationAccessNoticeProps) {
+  return (
+    <div className='flex h-full flex-col bg-[var(--bg)]'>
+      <div className={PAGE_HEADER_BAR}>
+        <ChipLink href={`/workspace/${workspaceId}/integrations`} leftIcon={ArrowLeft}>
+          Integrations
+        </ChipLink>
+      </div>
+      <EmptyState title={title} description={description} action={action} />
+    </div>
+  )
+}
+
+function IntegrationBlockDetailContent({ integration, workspaceId }: IntegrationBlockDetailProps) {
   const scrollContainerRef = useRef<HTMLDivElement>(null)
   useOAuthReturnRouter()
   const router = useRouter()
 
@@ -83,12 +83,17 @@ export function IntegrationTile({ blockType, icon: Icon, framed = false }: Integ
   )
 }
 
+interface IntegrationsShowcaseProps {
+  /** Tiles whose block type fails this check are left out of the grid. */
+  isTileVisible: (blockType: string) => boolean
+}
+
 /**
  * Decorative integrations grid: a notched, masked grid background populated
  * with a curated set of brand tiles. The bottom-right notch leaves room for an
  * "Explore in chat" CTA rendered by `ShowcaseWithExplore`.
  */
-export function IntegrationsShowcase() {
+export function IntegrationsShowcase({ isTileVisible }: IntegrationsShowcaseProps) {
   return (
     <div aria-hidden className='relative h-[144px] w-full overflow-hidden rounded-xl'>
       <div
@@ -110,7 +115,7 @@ export function IntegrationsShowcase() {
         <div className='absolute inset-0 grid translate-x-[0.5px] translate-y-[0.5px] grid-cols-[repeat(auto-fill,48px)] grid-rows-[repeat(auto-fill,48px)]'>
           {SHOWCASE_TILES.map((tile) => {
             const block = getBlock(tile.id)
-            if (!block) return null
+            if (!block || !isTileVisible(tile.id)) return null
             return (
               <div
                 key={tile.id}
 
@@ -4,8 +4,10 @@ import { Chip } from '@sim/emcn'
 import { ArrowRight } from '@sim/emcn/icons'
 import { useParams, useRouter } from 'next/navigation'
 import { useDeploymentShape } from '@/lib/core/config/deployment-shape'
+import { isIntegrationUsable } from '@/lib/integrations/access'
 import { IntegrationsShowcase } from '@/app/workspace/[workspaceId]/integrations/components/integrations-showcase'
 import { storeCuratedPrompt } from '@/blocks/integration-matcher'
+import { useIntegrationAccess } from '@/hooks/use-integration-access'
 
 interface ShowcaseWithExploreProps {
   /**
@@ -27,10 +29,13 @@ export function ShowcaseWithExplore({ prompt }: ShowcaseWithExploreProps) {
   const router = useRouter()
   const { chatEnabled } = useDeploymentShape()
   const workspaceId = (params?.workspaceId as string) || ''
+  const { getAccess } = useIntegrationAccess(workspaceId)
 
   return (
     <div className='relative'>
-      <IntegrationsShowcase />
+      <IntegrationsShowcase
+        isTileVisible={(blockType) => isIntegrationUsable(getAccess(blockType))}
+      />
       {chatEnabled && (
         <Chip
           active