diff --git a/src/main/ipc/pty.ts b/src/main/ipc/pty.ts
index 8fd261178..a9616bd4e 100644
--- a/src/main/ipc/pty.ts
+++ b/src/main/ipc/pty.ts
@@ -37,6 +37,7 @@ import {
   requestKindSchema
 } from '../../shared/telemetry-events'
 import { isRemoteAgentHooksEnabled } from '../../shared/agent-hook-relay'
+import { createTerminalSessionStateSaveFailureMessage } from '../../shared/terminal-session-state-save-failure'
 import { readShellStartupEnvVar } from '../pty/shell-startup-env'
 import {
   isTerminalLeafId,
@@ -1392,9 +1393,7 @@ export function registerPtyHandlers(
           if (!result.isReattach && args.connectionId && store) {
             store.removeSshRemotePtyLease(args.connectionId, result.id)
           }
-          throw new Error(
-            'Failed to save terminal session state. Check disk space and Orca data directory permissions, then try again.'
-          )
+          throw new Error(createTerminalSessionStateSaveFailureMessage())
         }
       }
       // Why: pre-signal cooperation gate — when the renderer has declared it
diff --git a/src/renderer/src/components/terminal-pane/TerminalPane.tsx b/src/renderer/src/components/terminal-pane/TerminalPane.tsx
index 31242072b..e8aa46b64 100644
--- a/src/renderer/src/components/terminal-pane/TerminalPane.tsx
+++ b/src/renderer/src/components/terminal-pane/TerminalPane.tsx
@@ -29,6 +29,7 @@ import { useTerminalFontZoom } from './useTerminalFontZoom'
 import CloseTerminalDialog from './CloseTerminalDialog'
 import { MobileDriverOverlay } from './MobileDriverOverlay'
 import { TerminalErrorToast } from './TerminalErrorToast'
+import { TerminalSessionStateSaveFailureDialog } from './TerminalSessionStateSaveFailureDialog'
 import TerminalContextMenu from './TerminalContextMenu'
 import { useSystemPrefersDark } from './use-system-prefers-dark'
 import { useTerminalPaneGlobalEffects } from './use-terminal-pane-global-effects'
@@ -49,6 +50,7 @@ import {
   getRemoteRuntimeTerminalHandle
 } from '@/runtime/runtime-terminal-stream'
 import { isPrimarySelectionEnabled, readPrimarySelectionText } from '@/lib/primary-selection'
+import { isTerminalSessionStateSaveFailure } from '../../../../shared/terminal-session-state-save-failure'
 
 // Why: registry lives in a leaf module so the store slice can import it
 // without re-entering the `slice → TerminalPane → store → slice` cycle
@@ -133,6 +135,7 @@ export default function TerminalPane({
   const searchStateRef = useRef<SearchState>({ query: '', caseSensitive: false, regex: false })
   const [closeConfirmPaneId, setCloseConfirmPaneId] = useState<number | null>(null)
   const [terminalError, setTerminalError] = useState<string | null>(null)
+  const [sessionStateSaveFailureOpen, setSessionStateSaveFailureOpen] = useState(false)
   // Why: override state lives in a plain Map for perf (safeFit reads it on
   // every resize). This counter forces a re-render when overrides change so
   // the mobile-fit banner appears/disappears. When an override is cleared
@@ -235,6 +238,11 @@ export default function TerminalPane({
   // then call handleRenameSubmit, saving the title the user wanted to discard.
   const renameSubmittedRef = useRef(false)
   const onPtyErrorRef = useRef((_paneId: number, message: string) => {
+    if (isTerminalSessionStateSaveFailure(message)) {
+      setTerminalError(null)
+      setSessionStateSaveFailureOpen(true)
+      return
+    }
     setTerminalError((prev) => (prev ? `${prev}\n${message}` : message))
   })
 
@@ -258,6 +266,8 @@ export default function TerminalPane({
   const markTerminalTabUnread = useAppStore((store) => store.markTerminalTabUnread)
   const clearWorktreeUnread = useAppStore((store) => store.clearWorktreeUnread)
   const clearTerminalTabUnread = useAppStore((store) => store.clearTerminalTabUnread)
+  const openSpacePage = useAppStore((store) => store.openSpacePage)
+  const refreshWorkspaceSpace = useAppStore((store) => store.refreshWorkspaceSpace)
   const settings = useAppStore((store) => store.settings)
   // Why: Windows is the only platform where bare right-click is repurposed as
   // a paste gesture; on macOS/Linux the terminal still owns right-click for the
@@ -279,6 +289,14 @@ export default function TerminalPane({
     }
   }, [startup, tabId, consumeTabStartupCommand])
 
+  const openDiskSpaceAnalyzer = useCallback(() => {
+    setSessionStateSaveFailureOpen(false)
+    openSpacePage()
+    void refreshWorkspaceSpace().catch((err: unknown) => {
+      console.warn('Failed to refresh Space Analyzer after terminal session save failure:', err)
+    })
+  }, [openSpacePage, refreshWorkspaceSpace])
+
   useEffect(() => {
     if (setupSplit) {
       consumeTabSetupSplit(tabId)
@@ -1219,6 +1237,13 @@ export default function TerminalPane({
       {terminalError && isActive && (
         <TerminalErrorToast error={terminalError} onDismiss={() => setTerminalError(null)} />
       )}
+      {isActive && (
+        <TerminalSessionStateSaveFailureDialog
+          open={sessionStateSaveFailureOpen}
+          onDismiss={() => setSessionStateSaveFailureOpen(false)}
+          onOpenSpaceAnalyzer={openDiskSpaceAnalyzer}
+        />
+      )}
       {activePane?.container &&
         createPortal(
           <TerminalSearch
diff --git a/src/renderer/src/components/terminal-pane/TerminalSessionStateSaveFailureDialog.tsx b/src/renderer/src/components/terminal-pane/TerminalSessionStateSaveFailureDialog.tsx
new file mode 100644
index 000000000..271c7021c
--- /dev/null
+++ b/src/renderer/src/components/terminal-pane/TerminalSessionStateSaveFailureDialog.tsx
@@ -0,0 +1,60 @@
+import { HardDrive } from 'lucide-react'
+import { Button } from '@/components/ui/button'
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle
+} from '@/components/ui/dialog'
+
+export function TerminalSessionStateSaveFailureDialog({
+  open,
+  onDismiss,
+  onOpenSpaceAnalyzer
+}: {
+  open: boolean
+  onDismiss: () => void
+  onOpenSpaceAnalyzer: () => void
+}): React.JSX.Element {
+  return (
+    <Dialog
+      open={open}
+      onOpenChange={(isOpen) => {
+        if (!isOpen) {
+          onDismiss()
+        }
+      }}
+    >
+      <DialogContent className="sm:max-w-md" showCloseButton={false}>
+        <DialogHeader className="gap-3">
+          <div className="flex items-center gap-3">
+            <div className="flex size-8 shrink-0 items-center justify-center rounded-md border border-border bg-muted/40">
+              <HardDrive className="size-4 text-muted-foreground" />
+            </div>
+            <DialogTitle className="text-base">Disk space is unavailable</DialogTitle>
+          </div>
+          <DialogDescription className="text-xs leading-5">
+            Orca could not save this terminal session because local storage is full or not writable.
+            Open the disk space analyzer to find workspace storage you can clean up.
+          </DialogDescription>
+        </DialogHeader>
+
+        <div className="rounded-md border border-border bg-muted/35 px-3 py-2.5 text-xs leading-5 text-muted-foreground">
+          The analyzer opens directly from here. You can also open it later from the lower-left
+          toolbox menu by choosing Space Analyzer.
+        </div>
+
+        <DialogFooter className="gap-2">
+          <Button type="button" variant="outline" size="sm" onClick={onDismiss}>
+            Dismiss
+          </Button>
+          <Button type="button" size="sm" autoFocus onClick={onOpenSpaceAnalyzer}>
+            Open Disk Space Analyzer
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  )
+}
diff --git a/src/renderer/src/components/terminal-pane/pty-transport.test.ts b/src/renderer/src/components/terminal-pane/pty-transport.test.ts
index 1164b4392..11f52ab32 100644
--- a/src/renderer/src/components/terminal-pane/pty-transport.test.ts
+++ b/src/renderer/src/components/terminal-pane/pty-transport.test.ts
@@ -8,6 +8,7 @@ import {
   encodeTerminalStreamJson,
   encodeTerminalStreamText
 } from '../../../../shared/terminal-stream-protocol'
+import { createTerminalSessionStateSaveFailureMessage } from '../../../../shared/terminal-session-state-save-failure'
 
 describe('createIpcPtyTransport', () => {
   const originalWindow = (globalThis as { window?: typeof window }).window
@@ -532,6 +533,39 @@ describe('createIpcPtyTransport', () => {
     expect(onError).toHaveBeenCalledWith('ENOENT: spawn /bin/nope not found')
   })
 
+  it('surfaces terminal session state save failures without the Electron IPC wrapper', async () => {
+    const { createIpcPtyTransport } = await import('./pty-transport')
+    const wrappedMessage = `Error invoking remote method 'pty:spawn': Error: ${createTerminalSessionStateSaveFailureMessage()}`
+    const spawnMock = vi.fn().mockRejectedValue(new Error(wrappedMessage))
+
+    ;(globalThis as { window: typeof window }).window = {
+      ...originalWindow,
+      api: {
+        ...originalWindow?.api,
+        pty: {
+          ...originalWindow?.api?.pty,
+          spawn: spawnMock,
+          write: vi.fn(),
+          resize: vi.fn(),
+          kill: vi.fn(),
+          onData: vi.fn(() => () => {}),
+          onReplay: vi.fn(() => () => {}),
+          onExit: vi.fn(() => () => {})
+        }
+      }
+    } as unknown as typeof window
+
+    const transport = createIpcPtyTransport()
+    const onError = vi.fn()
+
+    await transport.connect({
+      url: '',
+      callbacks: { onError }
+    })
+
+    expect(onError).toHaveBeenCalledWith(createTerminalSessionStateSaveFailureMessage())
+  })
+
   it('keeps the exit observer alive after detach so remounts do not reuse dead PTYs', async () => {
     const { createIpcPtyTransport } = await import('./pty-transport')
     const onPtyExit = vi.fn()
diff --git a/src/renderer/src/components/terminal-pane/pty-transport.ts b/src/renderer/src/components/terminal-pane/pty-transport.ts
index 8ccc6e8a3..98d88b580 100644
--- a/src/renderer/src/components/terminal-pane/pty-transport.ts
+++ b/src/renderer/src/components/terminal-pane/pty-transport.ts
@@ -20,6 +20,7 @@ import {
 import type { PtyTransport, IpcPtyTransportOptions, PtyConnectResult } from './pty-dispatcher'
 import { createBellDetector } from './bell-detector'
 import { createAgentStatusOscProcessor } from './agent-status-osc'
+import { extractIpcErrorMessage } from '@/lib/ipc-error'
 
 // Re-export public API so existing consumers keep working.
 export {
@@ -364,7 +365,7 @@ export function createIpcPtyTransport(opts: IpcPtyTransportOptions = {}): PtyTra
         }
         return spawnResult.id
       } catch (err) {
-        const msg = err instanceof Error ? err.message : String(err)
+        const msg = extractIpcErrorMessage(err, err instanceof Error ? err.message : String(err))
         if (connectionId && options.sessionId && msg.includes(SSH_SESSION_EXPIRED_ERROR)) {
           return {
             id: options.sessionId,
diff --git a/src/shared/terminal-session-state-save-failure.ts b/src/shared/terminal-session-state-save-failure.ts
new file mode 100644
index 000000000..309a98b65
--- /dev/null
+++ b/src/shared/terminal-session-state-save-failure.ts
@@ -0,0 +1,15 @@
+export const TERMINAL_SESSION_STATE_SAVE_FAILED_CODE = 'ORCA_TERMINAL_SESSION_STATE_SAVE_FAILED'
+
+export const TERMINAL_SESSION_STATE_SAVE_FAILED_MESSAGE =
+  'Orca could not save this terminal session because local storage is unavailable.'
+
+export function createTerminalSessionStateSaveFailureMessage(): string {
+  return `${TERMINAL_SESSION_STATE_SAVE_FAILED_CODE}: ${TERMINAL_SESSION_STATE_SAVE_FAILED_MESSAGE}`
+}
+
+export function isTerminalSessionStateSaveFailure(message: string): boolean {
+  return (
+    message.includes(TERMINAL_SESSION_STATE_SAVE_FAILED_CODE) ||
+    message.includes('Failed to save terminal session state')
+  )
+}