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 96894cf0aec..a824985f53e 100644
--- a/src/renderer/src/components/terminal-pane/pty-transport.test.ts
+++ b/src/renderer/src/components/terminal-pane/pty-transport.test.ts
@@ -1,5 +1,4 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
-import { createIpcPtyTransport } from './pty-transport'
 
 describe('createIpcPtyTransport', () => {
   const originalWindow = (globalThis as { window?: typeof window }).window
@@ -10,6 +9,7 @@ describe('createIpcPtyTransport', () => {
     | null = null
 
   beforeEach(() => {
+    vi.resetModules()
     onData = null
     onExit = null
     onOpenCodeStatus = null
@@ -57,6 +57,7 @@ describe('createIpcPtyTransport', () => {
   })
 
   it('maps OpenCode status events into the existing working to idle agent lifecycle', async () => {
+    const { createIpcPtyTransport } = await import('./pty-transport')
     const onTitleChange = vi.fn()
     const onAgentBecameWorking = vi.fn()
     const onAgentBecameIdle = vi.fn()
@@ -86,4 +87,33 @@ describe('createIpcPtyTransport', () => {
     expect(onData).not.toBeNull()
     expect(onExit).not.toBeNull()
   })
+
+  it('does not fire unread-side effects when replaying buffered data during attach', async () => {
+    const { createIpcPtyTransport, registerEagerPtyBuffer } = await import('./pty-transport')
+    const onTitleChange = vi.fn()
+    const onAgentBecameIdle = vi.fn()
+    const onBell = vi.fn()
+
+    const handle = registerEagerPtyBuffer('pty-restored', vi.fn())
+    onData?.({
+      id: 'pty-restored',
+      data: '\u001b]0;. Claude working\u0007\u001b]0;* Claude done\u0007\u0007'
+    })
+
+    const transport = createIpcPtyTransport({
+      onTitleChange,
+      onAgentBecameIdle,
+      onBell
+    })
+
+    transport.attach({
+      existingPtyId: 'pty-restored',
+      callbacks: {}
+    })
+
+    expect(handle.flush()).toBe('')
+    expect(onTitleChange).toHaveBeenCalledWith('* Claude done', '* Claude done')
+    expect(onAgentBecameIdle).not.toHaveBeenCalled()
+    expect(onBell).not.toHaveBeenCalled()
+  })
 })
diff --git a/src/renderer/src/components/terminal-pane/pty-transport.ts b/src/renderer/src/components/terminal-pane/pty-transport.ts
index 39d5dbe001a..15ae1fa0aa9 100644
--- a/src/renderer/src/components/terminal-pane/pty-transport.ts
+++ b/src/renderer/src/components/terminal-pane/pty-transport.ts
@@ -177,6 +177,7 @@ export function createIpcPtyTransport(opts: IpcPtyTransportOptions = {}): PtyTra
   let pendingEscape = false
   let inOsc = false
   let pendingOscEscape = false
+  let suppressAttentionEvents = false
   let lastEmittedTitle: string | null = null
   let lastObservedTerminalTitle: string | null = null
   let openCodeStatus: OpenCodeStatusEvent['status'] | null = null
@@ -184,7 +185,11 @@ export function createIpcPtyTransport(opts: IpcPtyTransportOptions = {}): PtyTra
   const agentTracker =
     onAgentBecameIdle || onAgentBecameWorking || onAgentExited
       ? createAgentStatusTracker(
-          onAgentBecameIdle ?? (() => {}),
+          (title) => {
+            if (!suppressAttentionEvents) {
+              onAgentBecameIdle?.(title)
+            }
+          },
           onAgentBecameWorking,
           onAgentExited
         )
@@ -316,7 +321,7 @@ export function createIpcPtyTransport(opts: IpcPtyTransportOptions = {}): PtyTra
               }, STALE_TITLE_TIMEOUT)
             }
           }
-          if (onBell && chunkContainsBell(data)) {
+          if (onBell && chunkContainsBell(data) && !suppressAttentionEvents) {
             onBell()
           }
         })
@@ -390,7 +395,7 @@ export function createIpcPtyTransport(opts: IpcPtyTransportOptions = {}): PtyTra
             }, STALE_TITLE_TIMEOUT)
           }
         }
-        if (onBell && chunkContainsBell(data)) {
+        if (onBell && chunkContainsBell(data) && !suppressAttentionEvents) {
           onBell()
         }
       })
@@ -419,7 +424,17 @@ export function createIpcPtyTransport(opts: IpcPtyTransportOptions = {}): PtyTra
       if (bufferHandle) {
         const buffered = bufferHandle.flush()
         if (buffered) {
-          ptyDataHandlers.get(id)?.(buffered)
+          // Why: eager PTY buffers contain output produced before the pane
+          // attached, often from a previous app session. We still replay that
+          // data so titles and scrollback restore correctly, but it must not
+          // generate fresh unread badges or notifications for unrelated
+          // worktrees just because Orca is reconnecting background terminals.
+          suppressAttentionEvents = true
+          try {
+            ptyDataHandlers.get(id)?.(buffered)
+          } finally {
+            suppressAttentionEvents = false
+          }
         }
         bufferHandle.dispose()
       }