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
new file mode 100644
index 0000000000..22d69cdd11
--- /dev/null
+++ b/web/app/components/base/prompt-editor/__tests__/sandbox-placeholder.spec.tsx
@@ -0,0 +1,59 @@
+import type { ReactElement } from 'react'
+import { render, screen } from '@testing-library/react'
+import SandboxPlaceholder from '../sandbox-placeholder'
+
+vi.mock('react-i18next', () => ({
+  Trans: ({ i18nKey, components = [] }: {
+    i18nKey: string
+    components?: ReactElement[]
+  }) => (
+    <div data-i18n-key={i18nKey} data-testid="sandbox-placeholder-trans">
+      {components}
+    </div>
+  ),
+}))
+
+describe('SandboxPlaceholder', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  // Rendering branches for sandbox availability and tool-block support.
+  describe('Rendering', () => {
+    it('should render nothing when sandbox is not supported', () => {
+      const { container } = render(<SandboxPlaceholder isSupportSandbox={false} />)
+
+      expect(container).toBeEmptyDOMElement()
+      expect(screen.queryByTestId('sandbox-placeholder-trans')).not.toBeInTheDocument()
+    })
+
+    it('should render slash and insert tokens when tool blocks are disabled', () => {
+      const { container } = render(
+        <SandboxPlaceholder
+          disableToolBlocks
+          isSupportSandbox
+        />,
+      )
+
+      expect(screen.getByTestId('sandbox-placeholder-trans')).toHaveAttribute('data-i18n-key', 'promptEditor.placeholderSandboxNoTools')
+
+      const spans = container.querySelectorAll('span')
+      expect(spans).toHaveLength(2)
+      expect(spans[0]).toHaveClass('inline-flex', 'bg-components-kbd-bg-gray', 'system-kbd')
+      expect(spans[1]).toHaveClass('border-b', 'border-dotted', 'border-current')
+    })
+
+    it('should render slash insert at and tools tokens when tool blocks are enabled', () => {
+      const { container } = render(<SandboxPlaceholder isSupportSandbox />)
+
+      expect(screen.getByTestId('sandbox-placeholder-trans')).toHaveAttribute('data-i18n-key', 'promptEditor.placeholderSandbox')
+
+      const spans = container.querySelectorAll('span')
+      expect(spans).toHaveLength(4)
+      expect(spans[0]).toHaveClass('inline-flex', 'bg-components-kbd-bg-gray', 'system-kbd')
+      expect(spans[1]).toHaveClass('border-b', 'border-dotted', 'border-current')
+      expect(spans[2]).toHaveClass('inline-flex', 'bg-components-kbd-bg-gray', 'system-kbd')
+      expect(spans[3]).toHaveClass('border-b', 'border-dotted', 'border-current')
+    })
+  })
+})
diff --git a/web/app/components/base/prompt-editor/index.tsx b/web/app/components/base/prompt-editor/index.tsx
index 9f202a3d62..141b960249 100644
--- a/web/app/components/base/prompt-editor/index.tsx
+++ b/web/app/components/base/prompt-editor/index.tsx
@@ -39,7 +39,6 @@ import {
 } from 'lexical'
 import * as React from 'react'
 import { useEffect, useState } from 'react'
-import { Trans } from 'react-i18next'
 import { WorkflowContext } from '@/app/components/workflow/context'
 import { HooksStoreContext } from '@/app/components/workflow/hooks-store/provider'
 import { FileReferenceNode } from '@/app/components/workflow/skill/editor/skill-editor/plugins/file-reference-block/node'
@@ -118,6 +117,7 @@ import {
   WorkflowVariableBlockNode,
   WorkflowVariableBlockReplacementBlock,
 } from './plugins/workflow-variable-block'
+import SandboxPlaceholder from './sandbox-placeholder'
 import { textToEditorState } from './utils'
 
 const ValueSyncPlugin: FC<{ value?: string }> = ({ value }) => {
@@ -342,50 +342,6 @@ const PromptEditorContent: FC<PromptEditorContentProps> = ({
     enabled: Boolean(isSupportSandbox),
   }), [isSupportSandbox])
 
-  const sandboxPlaceHolder = React.useMemo(() => {
-    if (!isSupportSandbox)
-      return null
-    const i18nKey = disableToolBlocks
-      ? 'promptEditor.placeholderSandboxNoTools'
-      : 'promptEditor.placeholderSandbox'
-    const components = disableToolBlocks
-      ? [
-          <span
-            key="slash"
-            className="inline-flex h-5 min-w-5 items-center justify-center rounded-[4px] bg-components-kbd-bg-gray px-1 text-text-tertiary system-kbd"
-          />,
-          <span
-            key="insert"
-            className="border-b border-dotted border-current"
-          />,
-        ]
-      : [
-          <span
-            key="slash"
-            className="inline-flex h-5 min-w-5 items-center justify-center rounded-[4px] bg-components-kbd-bg-gray px-1 text-text-tertiary system-kbd"
-          />,
-          <span
-            key="insert"
-            className="border-b border-dotted border-current"
-          />,
-          <span
-            key="at"
-            className="inline-flex h-5 min-w-5 items-center justify-center rounded-[4px] bg-components-kbd-bg-gray px-1 text-text-tertiary system-kbd"
-          />,
-          <span
-            key="tools"
-            className="border-b border-dotted border-current"
-          />,
-        ]
-    return (
-      <Trans
-        i18nKey={i18nKey}
-        ns="common"
-        components={components}
-      />
-    )
-  }, [disableToolBlocks, isSupportSandbox])
-
   const [floatingAnchorElem, setFloatingAnchorElem] = useState<HTMLDivElement | null>(null)
 
   const onRef = (floatingAnchorElement: HTMLDivElement | null) => {
@@ -415,7 +371,12 @@ const PromptEditorContent: FC<PromptEditorContentProps> = ({
               )}
               placeholder={(
                 <Placeholder
-                  value={placeholder || sandboxPlaceHolder}
+                  value={placeholder || (
+                    <SandboxPlaceholder
+                      disableToolBlocks={disableToolBlocks}
+                      isSupportSandbox={isSupportSandbox}
+                    />
+                  )}
                   className={cn('truncate', placeholderClassName)}
                   compact={compact}
                 />
diff --git a/web/app/components/base/prompt-editor/sandbox-placeholder.tsx b/web/app/components/base/prompt-editor/sandbox-placeholder.tsx
new file mode 100644
index 0000000000..5fb348bee0
--- /dev/null
+++ b/web/app/components/base/prompt-editor/sandbox-placeholder.tsx
@@ -0,0 +1,57 @@
+import type { FC, PropsWithChildren, ReactElement } from 'react'
+import { Trans } from 'react-i18next'
+
+type SandboxPlaceholderTokenProps = PropsWithChildren<{
+  variant: 'kbd' | 'action'
+}>
+
+const SandboxPlaceholderToken: FC<SandboxPlaceholderTokenProps> = ({ variant, children }) => {
+  if (variant === 'kbd') {
+    return (
+      <span className="inline-flex h-5 min-w-5 items-center justify-center rounded-[4px] bg-components-kbd-bg-gray px-1 text-text-tertiary system-kbd">
+        {children}
+      </span>
+    )
+  }
+
+  return (
+    <span className="border-b border-dotted border-current">
+      {children}
+    </span>
+  )
+}
+
+type SandboxPlaceholderProps = {
+  disableToolBlocks?: boolean
+  isSupportSandbox?: boolean
+}
+
+const SandboxPlaceholder: FC<SandboxPlaceholderProps> = ({
+  disableToolBlocks,
+  isSupportSandbox,
+}) => {
+  if (!isSupportSandbox)
+    return null
+
+  const components: ReactElement[] = [
+    <SandboxPlaceholderToken key="slash" variant="kbd" />,
+    <SandboxPlaceholderToken key="insert" variant="action" />,
+  ]
+
+  if (!disableToolBlocks) {
+    components.push(
+      <SandboxPlaceholderToken key="at" variant="kbd" />,
+      <SandboxPlaceholderToken key="tools" variant="action" />,
+    )
+  }
+
+  return (
+    <Trans
+      i18nKey={disableToolBlocks ? 'promptEditor.placeholderSandboxNoTools' : 'promptEditor.placeholderSandbox'}
+      ns="common"
+      components={components}
+    />
+  )
+}
+
+export default SandboxPlaceholder