diff --git a/src/components/shell/hooks/useShellTerminal.ts b/src/components/shell/hooks/useShellTerminal.ts
index 076c5b76..8b343811 100644
--- a/src/components/shell/hooks/useShellTerminal.ts
+++ b/src/components/shell/hooks/useShellTerminal.ts
@@ -1,5 +1,6 @@
 import { useCallback, useEffect, useRef, useState } from 'react';
 import type { MutableRefObject, RefObject } from 'react';
+import { ClipboardAddon, type IClipboardProvider } from '@xterm/addon-clipboard';
 import { FitAddon } from '@xterm/addon-fit';
 import { WebLinksAddon } from '@xterm/addon-web-links';
 import { WebglAddon } from '@xterm/addon-webgl';
@@ -19,6 +20,43 @@ import {
 import { sendSocketMessage } from '../utils/socket';
 import { ensureXtermFocusStyles } from '../utils/terminalStyles';
 
+// CLIs running inside the pty (e.g. `claude auth login`'s "press c to copy"
+// device-flow prompt) write to the clipboard via an OSC 52 escape sequence,
+// not a browser event — xterm.js ignores OSC 52 unless a clipboard addon is
+// loaded. Routes writes through the same fallback-aware helper the terminal's
+// own selection-copy shortcut uses, since `navigator.clipboard` is often
+// unavailable on self-hosted, non-HTTPS deployments.
+// `ClipboardSelectionType.SYSTEM` is `'c'` (vs. `'p'` for the X11 primary
+// selection) — compared as a literal since the addon ships it as a const
+// enum, which isolatedModules builds (esbuild/Vite) can't import as a value.
+const oscClipboardProvider: IClipboardProvider = {
+  readText: async (selection) => {
+    if (selection !== 'c') {
+      return '';
+    }
+    try {
+      return (await navigator.clipboard?.readText?.()) || '';
+    } catch {
+      return '';
+    }
+  },
+  writeText: async (selection, text) => {
+    if (selection !== 'c') {
+      return;
+    }
+    await copyTextToClipboard(text);
+  },
+};
+
+// The addon's published typings declare a single `(provider?)` constructor
+// param, but the shipped runtime actually takes `(base64?, provider?)` — see
+// node_modules/@xterm/addon-clipboard/lib/addon-clipboard.js. Cast to call it
+// the way it's really implemented.
+const ClipboardAddonCtor = ClipboardAddon as unknown as new (
+  base64?: unknown,
+  provider?: IClipboardProvider,
+) => ClipboardAddon;
+
 type UseShellTerminalOptions = {
   terminalContainerRef: RefObject<HTMLDivElement>;
   terminalRef: MutableRefObject<Terminal | null>;
@@ -93,6 +131,8 @@ export function useShellTerminal({
     fitAddonRef.current = nextFitAddon;
     nextTerminal.loadAddon(nextFitAddon);
 
+    nextTerminal.loadAddon(new ClipboardAddonCtor(undefined, oscClipboardProvider));
+
     // Avoid wrapped partial links in compact login flows.
     if (!minimal) {
       nextTerminal.loadAddon(new WebLinksAddon());