diff --git a/web/app/components/base/prompt-editor/__tests__/sandbox-placeholder.spec.tsx b/web/app/components/base/prompt-editor/__tests__/sandbox-placeholder.spec.tsx
index 6d391e10a6..2000838120 100644
--- a/web/app/components/base/prompt-editor/__tests__/sandbox-placeholder.spec.tsx
+++ b/web/app/components/base/prompt-editor/__tests__/sandbox-placeholder.spec.tsx
@@ -1,6 +1,44 @@
-import { render } from '@testing-library/react'
+import { fireEvent, render, screen } from '@testing-library/react'
+import { CLEAR_HIDE_MENU_TIMEOUT } from '../plugins/workflow-variable-block'
 import SandboxPlaceholder from '../sandbox-placeholder'
 
+const mocks = vi.hoisted(() => {
+  const selectEnd = vi.fn()
+  const insertNodes = vi.fn()
+  const createTextNode = vi.fn((text: string) => ({ text }))
+  const editor = {
+    focus: vi.fn((callback?: () => void) => callback?.()),
+    update: vi.fn((callback: () => void) => callback()),
+    dispatchCommand: vi.fn(),
+  }
+
+  return {
+    createTextNode,
+    editor,
+    insertNodes,
+    selectEnd,
+  }
+})
+
+vi.mock('@lexical/react/LexicalComposerContext', () => ({
+  useLexicalComposerContext: () => [mocks.editor],
+}))
+
+vi.mock('lexical', async (importOriginal) => {
+  const actual = await importOriginal<typeof import('lexical')>()
+  return {
+    ...actual,
+    $getRoot: () => ({
+      selectEnd: mocks.selectEnd,
+    }),
+    $insertNodes: mocks.insertNodes,
+  }
+})
+
+vi.mock('../plugins/custom-text/node', () => ({
+  $createCustomTextNode: (text: string) => mocks.createTextNode(text),
+}))
+
 vi.mock('react-i18next', () => ({
   useTranslation: () => ({
     t: (key: string) => {
@@ -20,7 +58,7 @@ describe('SandboxPlaceholder', () => {
     vi.clearAllMocks()
   })
 
-  // Rendering branches for sandbox availability and tool-block support.
+  // Rendering states for sandbox support and tool visibility.
   describe('Rendering', () => {
     it('should render nothing when sandbox is not supported', () => {
       const { container } = render(<SandboxPlaceholder isSupportSandbox={false} />)
@@ -28,63 +66,65 @@ describe('SandboxPlaceholder', () => {
       expect(container).toBeEmptyDOMElement()
     })
 
-    it('should render only the insert pair when tool blocks are disabled', () => {
-      const { container } = render(
+    it('should render only the insert action when tool blocks are disabled', () => {
+      render(
         <SandboxPlaceholder
           disableToolBlocks
           isSupportSandbox
         />,
       )
 
-      expect(container).toHaveTextContent('Write instructions here, /insert')
-      const tokens = container.querySelectorAll('.group\\/placeholder-token')
-      const kbdTokens = container.querySelectorAll('.system-kbd')
-      const actionTokens = container.querySelectorAll('.border-dotted')
-
-      expect(tokens).toHaveLength(1)
-      expect(kbdTokens).toHaveLength(1)
-      expect(actionTokens).toHaveLength(1)
-      expect(tokens[0]).toHaveClass(
-        'inline-flex',
-        'cursor-pointer',
-        'items-center',
-        'gap-1',
-        'text-text-tertiary',
-        'hover:text-components-button-secondary-accent-text',
-      )
-      expect(kbdTokens[0]).toHaveClass(
-        'bg-components-kbd-bg-gray',
-        'group-hover/placeholder-token:bg-components-button-secondary-accent-text-disabled',
-      )
-      expect(kbdTokens[0]).toHaveTextContent('/')
-      expect(actionTokens[0]).toHaveClass(
-        'pointer-events-auto',
-        'border-b',
-        'border-dotted',
-        'border-current',
-      )
-      expect(actionTokens[0]).toHaveTextContent('insert')
+      expect(screen.getByText('Write instructions here,')).toBeInTheDocument()
+      expect(screen.getByRole('button', { name: /insert/i })).toBeInTheDocument()
+      expect(screen.queryByRole('button', { name: /tools/i })).not.toBeInTheDocument()
     })
 
-    it('should render both insert and tools pairs when tool blocks are enabled', () => {
-      const { container } = render(<SandboxPlaceholder isSupportSandbox />)
+    it('should render insert and tools actions when tool blocks are enabled', () => {
+      render(<SandboxPlaceholder isSupportSandbox />)
 
-      expect(container).toHaveTextContent('Write instructions here, /insert, @tools')
-      const tokens = container.querySelectorAll('.group\\/placeholder-token')
-      const kbdTokens = container.querySelectorAll('.system-kbd')
-      const actionTokens = container.querySelectorAll('.border-dotted')
+      expect(screen.getByRole('button', { name: /insert/i })).toBeInTheDocument()
+      expect(screen.getByRole('button', { name: /tools/i })).toBeInTheDocument()
+      expect(screen.getAllByRole('button')).toHaveLength(2)
+    })
+  })
 
-      expect(tokens).toHaveLength(2)
-      expect(kbdTokens).toHaveLength(2)
-      expect(actionTokens).toHaveLength(2)
-      expect(kbdTokens[0]).toHaveTextContent('/')
-      expect(kbdTokens[1]).toHaveTextContent('@')
-      expect(actionTokens[0]).toHaveTextContent('insert')
-      expect(actionTokens[1]).toHaveTextContent('tools')
-      expect(tokens[1]).toHaveClass(
-        'group/placeholder-token',
-        'hover:text-components-button-secondary-accent-text',
-      )
+  // Click interactions should reuse the editor trigger workflow.
+  describe('Interactions', () => {
+    it('should insert slash and clear the hide timeout when clicking insert', () => {
+      render(<SandboxPlaceholder isSupportSandbox />)
+
+      fireEvent.click(screen.getByRole('button', { name: /insert/i }))
+
+      expect(mocks.editor.focus).toHaveBeenCalledTimes(1)
+      expect(mocks.editor.update).toHaveBeenCalledTimes(1)
+      expect(mocks.selectEnd).toHaveBeenCalledTimes(1)
+      expect(mocks.createTextNode).toHaveBeenCalledWith('/')
+      expect(mocks.insertNodes).toHaveBeenCalledWith([{ text: '/' }])
+      expect(mocks.editor.dispatchCommand).toHaveBeenCalledWith(CLEAR_HIDE_MENU_TIMEOUT, undefined)
+    })
+
+    it('should insert at-sign and clear the hide timeout when clicking tools', () => {
+      render(<SandboxPlaceholder isSupportSandbox />)
+
+      fireEvent.click(screen.getByRole('button', { name: /tools/i }))
+
+      expect(mocks.editor.focus).toHaveBeenCalledTimes(1)
+      expect(mocks.editor.update).toHaveBeenCalledTimes(1)
+      expect(mocks.selectEnd).toHaveBeenCalledTimes(1)
+      expect(mocks.createTextNode).toHaveBeenCalledWith('@')
+      expect(mocks.insertNodes).toHaveBeenCalledWith([{ text: '@' }])
+      expect(mocks.editor.dispatchCommand).toHaveBeenCalledWith(CLEAR_HIDE_MENU_TIMEOUT, undefined)
+    })
+
+    it('should not trigger editor insertion when placeholder is not editable', () => {
+      render(<SandboxPlaceholder isSupportSandbox editable={false} />)
+
+      fireEvent.click(screen.getByRole('button', { name: /insert/i }))
+
+      expect(mocks.editor.focus).not.toHaveBeenCalled()
+      expect(mocks.editor.update).not.toHaveBeenCalled()
+      expect(mocks.insertNodes).not.toHaveBeenCalled()
+      expect(mocks.editor.dispatchCommand).not.toHaveBeenCalled()
     })
   })
 })
diff --git a/web/app/components/base/prompt-editor/index.tsx b/web/app/components/base/prompt-editor/index.tsx
index 141b960249..a1490e77cd 100644
--- a/web/app/components/base/prompt-editor/index.tsx
+++ b/web/app/components/base/prompt-editor/index.tsx
@@ -373,6 +373,7 @@ const PromptEditorContent: FC<PromptEditorContentProps> = ({
                 <Placeholder
                   value={placeholder || (
                     <SandboxPlaceholder
+                      editable={editable}
                       disableToolBlocks={disableToolBlocks}
                       isSupportSandbox={isSupportSandbox}
                     />
diff --git a/web/app/components/base/prompt-editor/sandbox-placeholder.tsx b/web/app/components/base/prompt-editor/sandbox-placeholder.tsx
index 4beab897af..21d1ff9374 100644
--- a/web/app/components/base/prompt-editor/sandbox-placeholder.tsx
+++ b/web/app/components/base/prompt-editor/sandbox-placeholder.tsx
@@ -1,22 +1,40 @@
-import type { FC } from 'react'
+import type { FC, MouseEvent } from 'react'
+import { useLexicalComposerContext } from '@lexical/react/LexicalComposerContext'
+import { $getRoot, $insertNodes } from 'lexical'
+import { useCallback } from 'react'
 import { useTranslation } from 'react-i18next'
 import { cn } from '@/utils/classnames'
+import { $createCustomTextNode } from './plugins/custom-text/node'
+import { CLEAR_HIDE_MENU_TIMEOUT } from './plugins/workflow-variable-block'
 
 type SandboxPlaceholderTokenProps = {
   actionLabel?: string
+  onClick?: () => void
   shortcut: '/' | '@'
 }
 
 const SandboxPlaceholderToken: FC<SandboxPlaceholderTokenProps> = ({
   actionLabel,
+  onClick,
   shortcut,
 }) => {
+  const handleMouseDown = (e: MouseEvent<HTMLButtonElement>) => {
+    e.preventDefault()
+  }
+
   return (
-    <span
+    <button
+      type="button"
+      tabIndex={-1}
+      onMouseDown={handleMouseDown}
+      onClick={onClick}
       className={cn(
-        'inline-flex cursor-pointer items-center gap-1 text-text-tertiary hover:text-components-button-secondary-accent-text',
+        'pointer-events-auto inline-flex appearance-none items-center gap-1 bg-transparent p-0 text-text-tertiary',
+        'cursor-pointer hover:text-components-button-secondary-accent-text',
+        'disabled:cursor-default disabled:hover:text-text-tertiary',
         'group/placeholder-token',
       )}
+      disabled={!onClick}
     >
       <span
         className={cn(
@@ -28,26 +46,39 @@ const SandboxPlaceholderToken: FC<SandboxPlaceholderTokenProps> = ({
       </span>
       <span
         className={cn(
-          'pointer-events-auto border-b border-dotted border-current px-0.5 transition-colors',
+          'border-b border-dotted border-current px-0.5 transition-colors',
         )}
       >
         {actionLabel}
       </span>
-    </span>
+    </button>
   )
 }
 
 type SandboxPlaceholderProps = {
+  editable?: boolean
   disableToolBlocks?: boolean
   isSupportSandbox?: boolean
 }
 
 const SandboxPlaceholder: FC<SandboxPlaceholderProps> = ({
+  editable = true,
   disableToolBlocks,
   isSupportSandbox,
 }) => {
+  const [editor] = useLexicalComposerContext()
   const { t } = useTranslation()
 
+  const handleQuickInsert = useCallback((trigger: '/' | '@') => {
+    editor.focus(() => {
+      editor.update(() => {
+        $getRoot().selectEnd()
+        $insertNodes([$createCustomTextNode(trigger)])
+        editor.dispatchCommand(CLEAR_HIDE_MENU_TIMEOUT, undefined)
+      })
+    })
+  }, [editor])
+
   if (!isSupportSandbox)
     return null
 
@@ -56,6 +87,7 @@ const SandboxPlaceholder: FC<SandboxPlaceholderProps> = ({
       {t('promptEditor.placeholderSandboxPrefix', { ns: 'common' })}
       <SandboxPlaceholderToken
         shortcut="/"
+        onClick={editable ? () => handleQuickInsert('/') : undefined}
         actionLabel={t('promptEditor.placeholderSandboxInsert', { ns: 'common' })}
       />
       {!disableToolBlocks && (
@@ -63,6 +95,7 @@ const SandboxPlaceholder: FC<SandboxPlaceholderProps> = ({
           {t('promptEditor.placeholderSandboxSeparator', { ns: 'common' })}
           <SandboxPlaceholderToken
             shortcut="@"
+            onClick={editable ? () => handleQuickInsert('@') : undefined}
             actionLabel={t('promptEditor.placeholderSandboxTools', { ns: 'common' })}
           />
         </>