diff --git a/web/app/components/workflow/block-selector/__tests__/all-start-blocks.spec.tsx b/web/app/components/workflow/block-selector/__tests__/all-start-blocks.spec.tsx
index 3559ad12f2a..98a4868765d 100644
--- a/web/app/components/workflow/block-selector/__tests__/all-start-blocks.spec.tsx
+++ b/web/app/components/workflow/block-selector/__tests__/all-start-blocks.spec.tsx
@@ -287,6 +287,7 @@ describe('AllStartBlocks', () => {
         createMarketplacePluginsMock([
           createPlugin({
             name: 'start-marketplace',
+            plugin_id: 'plugin-2',
             label: { en_US: 'Start Marketplace', zh_Hans: 'Start Marketplace' },
           }),
         ]),
@@ -311,6 +312,28 @@ describe('AllStartBlocks', () => {
       expect(screen.getAllByRole('link', { name: /plugin\.searchInMarketplace/i })).toHaveLength(1)
     })
 
+    it('shows installed triggers once and keeps other marketplace results available', async () => {
+      enableMarketplaceForRender = true
+      mockUseMarketplacePlugins.mockReturnValue(
+        createMarketplacePluginsMock([
+          createPlugin({ plugin_id: 'plugin-1', label: { en_US: 'Installed Marketplace' } }),
+          createPlugin({ plugin_id: 'plugin-2', label: { en_US: 'Available Marketplace' } }),
+        ]),
+      )
+
+      render(
+        <AllStartBlocks
+          searchText="provider"
+          onSelect={vi.fn()}
+          availableBlocksTypes={[BlockEnum.TriggerPlugin]}
+        />,
+      )
+
+      expect(await screen.findByText('Provider One')).toBeInTheDocument()
+      expect(screen.queryByText('Installed Marketplace')).not.toBeInTheDocument()
+      expect(screen.getByText('Available Marketplace')).toBeInTheDocument()
+    })
+
     it('should show the user input conflict state without allowing another start selection', () => {
       const onSelect = vi.fn()
       enableMarketplaceForRender = true
diff --git a/web/app/components/workflow/block-selector/__tests__/data-sources.spec.tsx b/web/app/components/workflow/block-selector/__tests__/data-sources.spec.tsx
index b22f3788c51..a8c5f16d50d 100644
--- a/web/app/components/workflow/block-selector/__tests__/data-sources.spec.tsx
+++ b/web/app/components/workflow/block-selector/__tests__/data-sources.spec.tsx
@@ -8,11 +8,15 @@ import { renderWithConsoleQuery } from '@/test/console/query-data'
 import { BlockEnum } from '../../types'
 import { DEFAULT_FILE_EXTENSIONS_IN_LOCAL_FILE_DATA_SOURCE } from '../constants'
 import DataSources from '../data-sources'
+import { createPlugin } from './factories'
 
 const { marketplaceQuery, language, trackEvent } = vi.hoisted(() => ({
-  marketplaceQuery: vi.fn((_params?: Parameters<typeof useMarketplacePlugins>[0]) => ({
-    data: undefined,
-  })),
+  marketplaceQuery: vi.fn(
+    (
+      _params?: Parameters<typeof useMarketplacePlugins>[0],
+    ): ReturnType<typeof useMarketplacePlugins> =>
+      ({ data: undefined }) as ReturnType<typeof useMarketplacePlugins>,
+  ),
   language: { value: 'en_US' },
   trackEvent: vi.fn(),
 }))
@@ -210,6 +214,32 @@ it('debounces marketplace search while datasource filtering remains immediate',
   )
 })
 
+it('shows installed datasources once and keeps other marketplace results available', async () => {
+  const provider = namedProvider('source')
+  marketplaceQuery.mockReturnValue({
+    data: {
+      pages: [
+        {
+          plugins: [
+            createPlugin({ plugin_id: provider.plugin_id, label: { en_US: 'Installed Source' } }),
+            createPlugin({ plugin_id: 'dify/other', label: { en_US: 'Other Source' } }),
+          ],
+          page: 1,
+          page_size: 40,
+          total: 2,
+        },
+      ],
+      pageParams: [1],
+    },
+  } as ReturnType<typeof useMarketplacePlugins>)
+
+  render(<DataSources searchText="source" onSelect={vi.fn()} dataSources={[provider]} />, true)
+
+  expect(await screen.findByRole('button', { name: 'source' })).toBeInTheDocument()
+  expect(screen.queryByText('Installed Source')).not.toBeInTheDocument()
+  expect(screen.getByText('Other Source')).toBeInTheDocument()
+})
+
 it('keeps an expanded datasource open when the language changes its sort letter', async () => {
   const user = userEvent.setup()
   const provider = createDatasourceProvider()
diff --git a/web/app/components/workflow/block-selector/all-start-blocks.tsx b/web/app/components/workflow/block-selector/all-start-blocks.tsx
index 3dfb8be0346..7a476e69ddd 100644
--- a/web/app/components/workflow/block-selector/all-start-blocks.tsx
+++ b/web/app/components/workflow/block-selector/all-start-blocks.tsx
@@ -117,9 +117,12 @@ function AllStartBlocks({
   )
   const { data: marketplacePluginsData, isFetching: isMarketplaceFetching } =
     useMarketplacePlugins(marketplaceSearchParams)
-  const marketplacePlugins = useMemo(
-    () => marketplacePluginsData?.pages.flatMap((page) => page.plugins) ?? [],
-    [marketplacePluginsData?.pages],
+  const notInstalledPlugins = useMemo(
+    () =>
+      marketplacePluginsData?.pages.flatMap((page) =>
+        page.plugins.filter((plugin) => !providerMap.has(plugin.plugin_id)),
+      ) ?? [],
+    [marketplacePluginsData?.pages, providerMap],
   )
 
   const shouldShowFeatured = enableTriggerPlugin && enable_marketplace && !hasFilter
@@ -136,7 +139,7 @@ function AllStartBlocks({
 
   const hasInstalledPluginContent = enableTriggerPlugin && hasPluginContent
   const hasMarketplaceContent =
-    enableTriggerPlugin && enable_marketplace && marketplacePlugins.length > 0
+    enableTriggerPlugin && enable_marketplace && notInstalledPlugins.length > 0
   const hasAnyContent =
     hasStartBlocksContent ||
     hasInstalledPluginContent ||
@@ -231,7 +234,7 @@ function AllStartBlocks({
                 <PluginList
                   ref={pluginRef}
                   wrapElemRef={wrapElemRef as RefObject<HTMLElement>}
-                  list={marketplacePlugins}
+                  list={notInstalledPlugins}
                   searchText={trimmedSearchText}
                   category={PluginCategoryEnum.trigger}
                   tags={tags}
diff --git a/web/app/components/workflow/block-selector/data-sources.tsx b/web/app/components/workflow/block-selector/data-sources.tsx
index d0483bddcee..d80819a99e5 100644
--- a/web/app/components/workflow/block-selector/data-sources.tsx
+++ b/web/app/components/workflow/block-selector/data-sources.tsx
@@ -113,10 +113,14 @@ function DataSources({
     ],
   )
   const { data: marketplacePluginsData } = useMarketplacePlugins(marketplaceSearchParams)
-  const notInstalledPlugins = useMemo(
-    () => marketplacePluginsData?.pages.flatMap((page) => page.plugins) ?? [],
-    [marketplacePluginsData?.pages],
-  )
+  const notInstalledPlugins = useMemo(() => {
+    const installedPluginIds = new Set(dataSources.map((provider) => provider.plugin_id))
+    return (
+      marketplacePluginsData?.pages.flatMap((page) =>
+        page.plugins.filter((plugin) => !installedPluginIds.has(plugin.plugin_id)),
+      ) ?? []
+    )
+  }, [dataSources, marketplacePluginsData?.pages])
 
   return (
     <div className={cn('w-100 max-w-full min-w-0', className)}>
diff --git a/web/app/components/workflow/nodes/_base/components/__tests__/agent-strategy-selector.spec.tsx b/web/app/components/workflow/nodes/_base/components/__tests__/agent-strategy-selector.spec.tsx
index 89b3078a55f..3aefde257d2 100644
--- a/web/app/components/workflow/nodes/_base/components/__tests__/agent-strategy-selector.spec.tsx
+++ b/web/app/components/workflow/nodes/_base/components/__tests__/agent-strategy-selector.spec.tsx
@@ -207,6 +207,28 @@ it('keeps marketplace search and its category link alongside the installed catal
   expect(screen.getByText('Marketplace strategy')).toBeInTheDocument()
 })
 
+it('shows installed strategies once and keeps other marketplace results available', async () => {
+  const user = userEvent.setup()
+  const provider = createProvider()
+  marketplaceResults.mockReturnValue([
+    createPlugin({ plugin_id: provider.plugin_id, label: { en_US: 'Installed Marketplace' } }),
+    createPlugin({ plugin_id: 'org/available', label: { en_US: 'Available Marketplace' } }),
+  ])
+  request.mockImplementation(() => Promise.resolve(Response.json([provider])))
+  render(<AgentStrategySelector onChange={vi.fn()} />, {
+    systemFeatures: { enable_marketplace: true },
+  })
+
+  await user.click(screen.getByText('workflowAgent.nodes.agent.strategy.selectTip'))
+  expect(await screen.findByRole('button', { name: 'Agent provider' })).toBeInTheDocument()
+  await user.type(
+    screen.getByPlaceholderText('workflowAgent.nodes.agent.strategy.searchPlaceholder'),
+    'agent',
+  )
+  expect(screen.queryByText('Installed Marketplace')).not.toBeInTheDocument()
+  expect(await screen.findByText('Available Marketplace')).toBeInTheDocument()
+})
+
 it('preserves an older saved selection with no plugin identifier until the user chooses a replacement', async () => {
   const user = userEvent.setup()
   const onChange = vi.fn()
diff --git a/web/app/components/workflow/nodes/_base/components/agent-strategy-selector.tsx b/web/app/components/workflow/nodes/_base/components/agent-strategy-selector.tsx
index 6949402e6c8..61edce260e3 100644
--- a/web/app/components/workflow/nodes/_base/components/agent-strategy-selector.tsx
+++ b/web/app/components/workflow/nodes/_base/components/agent-strategy-selector.tsx
@@ -116,8 +116,12 @@ export const AgentStrategySelector = memo((props: AgentStrategySelectorProps) =>
 
   const wrapElemRef = useRef<HTMLDivElement>(null)
 
-  const { queryPluginsWithDebounced: fetchPlugins, plugins: notInstalledPlugins = [] } =
+  const { queryPluginsWithDebounced: fetchPlugins, plugins: marketplacePlugins = [] } =
     useMarketplacePlugins()
+  const notInstalledPlugins = useMemo(() => {
+    const installedPluginIds = new Set((providers.data ?? []).map((provider) => provider.plugin_id))
+    return marketplacePlugins.filter((plugin) => !installedPluginIds.has(plugin.plugin_id))
+  }, [marketplacePlugins, providers.data])
 
   useEffect(() => {
     if (!enable_marketplace) return