diff --git a/client/src/hooks/SSE/__tests__/usePiiHandler.spec.ts b/client/src/hooks/SSE/__tests__/usePiiHandler.spec.ts
new file mode 100644
index 0000000000..14af713900
--- /dev/null
+++ b/client/src/hooks/SSE/__tests__/usePiiHandler.spec.ts
@@ -0,0 +1,38 @@
+import type { PiiPatternMatch } from '~/hooks/SSE/piiLabels';
+import { formatPiiLabels } from '~/hooks/SSE/piiLabels';
+
+describe('formatPiiLabels', () => {
+  it('returns empty string when matches is undefined', () => {
+    expect(formatPiiLabels(undefined)).toBe('');
+  });
+
+  it('returns empty string when matches is empty', () => {
+    expect(formatPiiLabels([])).toBe('');
+  });
+
+  it('joins multiple distinct pattern labels with a comma', () => {
+    const matches: PiiPatternMatch[] = [
+      { patternId: 'a', patternLabel: 'Anthropic API key', count: 1 },
+      { patternId: 'b', patternLabel: 'GitHub token', count: 2 },
+    ];
+    expect(formatPiiLabels(matches)).toBe('Anthropic API key, GitHub token');
+  });
+
+  it('dedupes pattern labels by display name', () => {
+    const matches: PiiPatternMatch[] = [
+      { patternId: 'a', patternLabel: 'Anthropic API key', count: 1 },
+      { patternId: 'b', patternLabel: 'Anthropic API key', count: 1 },
+      { patternId: 'c', patternLabel: 'GitHub token', count: 1 },
+    ];
+    expect(formatPiiLabels(matches)).toBe('Anthropic API key, GitHub token');
+  });
+
+  it('skips entries without a usable label', () => {
+    const matches = [
+      { patternId: 'a', patternLabel: '', count: 1 },
+      { patternId: 'b', patternLabel: '   ', count: 1 },
+      { patternId: 'c', patternLabel: 'GitHub token', count: 1 },
+    ] as PiiPatternMatch[];
+    expect(formatPiiLabels(matches)).toBe('GitHub token');
+  });
+});
diff --git a/client/src/hooks/SSE/piiLabels.ts b/client/src/hooks/SSE/piiLabels.ts
new file mode 100644
index 0000000000..8cb2e0beba
--- /dev/null
+++ b/client/src/hooks/SSE/piiLabels.ts
@@ -0,0 +1,31 @@
+export type PiiPatternMatch = {
+  patternId: string;
+  patternLabel: string;
+  count: number;
+};
+
+export type PiiEvent = {
+  type: 'pii_matches';
+  matches?: PiiPatternMatch[];
+};
+
+const dedupeLabels = (matches: PiiPatternMatch[]): string[] => {
+  const seen = new Set<string>();
+  const labels: string[] = [];
+  for (const match of matches) {
+    const label = match?.patternLabel?.trim();
+    if (!label || seen.has(label)) {
+      continue;
+    }
+    seen.add(label);
+    labels.push(label);
+  }
+  return labels;
+};
+
+export const formatPiiLabels = (matches?: PiiPatternMatch[]): string => {
+  if (!matches || matches.length === 0) {
+    return '';
+  }
+  return dedupeLabels(matches).join(', ');
+};
diff --git a/client/src/hooks/SSE/useEventHandlers.ts b/client/src/hooks/SSE/useEventHandlers.ts
index 29aef8a1dd..fac3dabaea 100644
--- a/client/src/hooks/SSE/useEventHandlers.ts
+++ b/client/src/hooks/SSE/useEventHandlers.ts
@@ -43,6 +43,7 @@ import useAttachmentHandler from '~/hooks/SSE/useAttachmentHandler';
 import useContentHandler from '~/hooks/SSE/useContentHandler';
 import useStepHandler from '~/hooks/SSE/useStepHandler';
 import { useApplyAgentTemplate } from '~/hooks/Agents';
+import usePiiHandler from '~/hooks/SSE/usePiiHandler';
 import { useAuthContext } from '~/hooks/AuthContext';
 import { MESSAGE_UPDATE_INTERVAL } from '~/common';
 import { useLiveAnnouncer } from '~/Providers';
@@ -285,6 +286,7 @@ export default function useEventHandlers({
     lastAnnouncementTimeRef,
   });
   const attachmentHandler = useAttachmentHandler(queryClient);
+  const { piiMatchesHandler } = usePiiHandler();
 
   /** Wipe the per-subagent Recoil atoms on conversation navigation.
    *  Historical subagent dialogs rehydrate from the persisted
@@ -1079,5 +1081,6 @@ export default function useEventHandlers({
     attachmentHandler,
     abortConversation,
     resetContentHandler,
+    piiMatchesHandler,
   };
 }
diff --git a/client/src/hooks/SSE/usePiiHandler.ts b/client/src/hooks/SSE/usePiiHandler.ts
new file mode 100644
index 0000000000..f869f7aa43
--- /dev/null
+++ b/client/src/hooks/SSE/usePiiHandler.ts
@@ -0,0 +1,28 @@
+import { useCallback } from 'react';
+import { useToastContext } from '@librechat/client';
+import type { PiiEvent } from '~/hooks/SSE/piiLabels';
+import { formatPiiLabels } from '~/hooks/SSE/piiLabels';
+import useLocalize from '~/hooks/useLocalize';
+
+export type { PiiEvent, PiiPatternMatch } from '~/hooks/SSE/piiLabels';
+
+export default function usePiiHandler() {
+  const localize = useLocalize();
+  const { showToast } = useToastContext();
+
+  const piiMatchesHandler = useCallback(
+    (data: PiiEvent) => {
+      const labels = formatPiiLabels(data.matches);
+      if (!labels) {
+        return;
+      }
+      showToast({
+        message: localize('com_ui_pii_redacted', { 0: labels }),
+        status: 'info',
+      });
+    },
+    [localize, showToast],
+  );
+
+  return { piiMatchesHandler };
+}
diff --git a/client/src/hooks/SSE/useResumableSSE.ts b/client/src/hooks/SSE/useResumableSSE.ts
index 084eb6ab2c..0815f2c281 100644
--- a/client/src/hooks/SSE/useResumableSSE.ts
+++ b/client/src/hooks/SSE/useResumableSSE.ts
@@ -453,6 +453,7 @@ export default function useResumableSSE(
     syncStepMessage,
     attachmentHandler,
     resetContentHandler,
+    piiMatchesHandler,
   } = useEventHandlers({
     setMessages,
     getMessages,
@@ -712,6 +713,11 @@ export default function useResumableSSE(
             return;
           }
 
+          if (data.type === 'pii_matches') {
+            piiMatchesHandler(data);
+            return;
+          }
+
           if (data.type != null) {
             const { text, index } = data;
             if (text != null && index !== textIndex) {
@@ -975,6 +981,7 @@ export default function useResumableSSE(
       clearStepMaps,
       messageHandler,
       errorHandler,
+      piiMatchesHandler,
       setIsSubmitting,
       getMessages,
       setMessages,
diff --git a/client/src/hooks/SSE/useSSE.ts b/client/src/hooks/SSE/useSSE.ts
index 509b7c213e..6c6147c7b0 100644
--- a/client/src/hooks/SSE/useSSE.ts
+++ b/client/src/hooks/SSE/useSSE.ts
@@ -45,6 +45,7 @@ export default function useSSE(
     titleHandler,
     attachmentHandler,
     abortConversation,
+    piiMatchesHandler,
   } = useEventHandlers({
     setMessages,
     getMessages,
@@ -123,6 +124,8 @@ export default function useSSE(
         setActiveRunId(runId);
         /* synchronize messages to Assistants API as well as with real DB ID's */
         syncHandler(data, { ...submission, userMessage } as EventSubmission);
+      } else if (data.type === 'pii_matches') {
+        piiMatchesHandler(data);
       } else if (data.type != null) {
         const { text, index } = data;
         if (text != null && index !== textIndex) {
diff --git a/client/src/locales/en/translation.json b/client/src/locales/en/translation.json
index b7d2e4ae96..fab342441a 100644
--- a/client/src/locales/en/translation.json
+++ b/client/src/locales/en/translation.json
@@ -1344,6 +1344,7 @@
   "com_ui_permissions_failed_load": "Failed to load permissions. Please try again.",
   "com_ui_permissions_failed_update": "Failed to update permissions. Please try again.",
   "com_ui_permissions_updated_success": "Permissions updated successfully",
+  "com_ui_pii_redacted": "Redacted from your message: {{0}}",
   "com_ui_pin": "Pin",
   "com_ui_plus_n_more": "+{{0}} more",
   "com_ui_preferences_updated": "Preferences updated successfully",