diff --git a/src/main/window/mobile-markdown-request-relay.test.ts b/src/main/window/mobile-markdown-request-relay.test.ts
index ff0c30dacc7..db587f07344 100644
--- a/src/main/window/mobile-markdown-request-relay.test.ts
+++ b/src/main/window/mobile-markdown-request-relay.test.ts
@@ -68,14 +68,22 @@ describe('requestMobileMarkdownFromRenderer', () => {
     await expect(pending).resolves.toMatchObject({ content: '# ok' })
   })
 
-  it('rejects and removes the pending listener when the renderer is destroyed', async () => {
+  it('rejects and cleans up when the BrowserWindow closes and webContents becomes unavailable', async () => {
     const { requestMobileMarkdownFromRenderer } = await import('./mobile-markdown-request-relay')
-    const mainWebContents = Object.assign(new EventEmitter(), {
+    const webContents = Object.assign(new EventEmitter(), {
       send: vi.fn()
     })
+    let windowClosed = false
     const mainWindow = Object.assign(new EventEmitter(), {
-      isDestroyed: () => false,
-      webContents: mainWebContents
+      isDestroyed: () => false
+    })
+    Object.defineProperty(mainWindow, 'webContents', {
+      get: () => {
+        if (windowClosed) {
+          throw new Error('webContents unavailable after close')
+        }
+        return webContents
+      }
     })
 
     const pending = requestMobileMarkdownFromRenderer(mainWindow as never, {
@@ -85,9 +93,12 @@ describe('requestMobileMarkdownFromRenderer', () => {
     })
     expect(ipcEmitter.listenerCount('ui:mobileMarkdownResponse')).toBe(1)
 
-    mainWebContents.emit('destroyed')
+    windowClosed = true
+    mainWindow.emit('closed')
 
     await expect(pending).rejects.toThrow('renderer_unavailable')
     expect(ipcEmitter.listenerCount('ui:mobileMarkdownResponse')).toBe(0)
+    expect(webContents.listenerCount('destroyed')).toBe(0)
+    expect(webContents.listenerCount('render-process-gone')).toBe(0)
   })
 })
diff --git a/src/main/window/mobile-markdown-request-relay.ts b/src/main/window/mobile-markdown-request-relay.ts
index 1bd4290e960..d1c80a38920 100644
--- a/src/main/window/mobile-markdown-request-relay.ts
+++ b/src/main/window/mobile-markdown-request-relay.ts
@@ -24,6 +24,7 @@ export async function requestMobileMarkdownFromRenderer(
   if (mainWindow.isDestroyed()) {
     throw new Error('renderer_unavailable')
   }
+  const webContents = mainWindow.webContents
   const id = randomUUID()
   return await new Promise((resolve, reject) => {
     let settled = false
@@ -41,9 +42,9 @@ export async function requestMobileMarkdownFromRenderer(
       if (typeof mainWindow.removeListener === 'function') {
         mainWindow.removeListener('closed', onRendererUnavailable)
       }
-      if (typeof mainWindow.webContents.removeListener === 'function') {
-        mainWindow.webContents.removeListener('destroyed', onRendererUnavailable)
-        mainWindow.webContents.removeListener('render-process-gone', onRendererUnavailable)
+      if (typeof webContents.removeListener === 'function') {
+        webContents.removeListener('destroyed', onRendererUnavailable)
+        webContents.removeListener('render-process-gone', onRendererUnavailable)
       }
       if (error) {
         reject(error)
@@ -61,7 +62,7 @@ export async function requestMobileMarkdownFromRenderer(
       event: Electron.IpcMainEvent,
       response: RuntimeMobileMarkdownResponse
     ): void => {
-      if (event.sender !== mainWindow.webContents) {
+      if (event.sender !== webContents) {
         return
       }
       if (response.id !== id) {
@@ -77,12 +78,12 @@ export async function requestMobileMarkdownFromRenderer(
     if (typeof mainWindow.once === 'function') {
       mainWindow.once('closed', onRendererUnavailable)
     }
-    if (typeof mainWindow.webContents.once === 'function') {
-      mainWindow.webContents.once('destroyed', onRendererUnavailable)
-      mainWindow.webContents.once('render-process-gone', onRendererUnavailable)
+    if (typeof webContents.once === 'function') {
+      webContents.once('destroyed', onRendererUnavailable)
+      webContents.once('render-process-gone', onRendererUnavailable)
     }
     try {
-      mainWindow.webContents.send('ui:mobileMarkdownRequest', { id, ...request })
+      webContents.send('ui:mobileMarkdownRequest', { id, ...request })
     } catch {
       finish(new Error('renderer_unavailable'))
     }
diff --git a/src/main/window/terminal-tab-close-request-relay.test.ts b/src/main/window/terminal-tab-close-request-relay.test.ts
index 3dd9873088c..ab3e3c57c77 100644
--- a/src/main/window/terminal-tab-close-request-relay.test.ts
+++ b/src/main/window/terminal-tab-close-request-relay.test.ts
@@ -79,24 +79,35 @@ describe('requestTerminalTabCloseFromRenderer', () => {
     await expect(pending).rejects.toThrow('terminal_tab_pinned')
   })
 
-  it('rejects and removes the pending listener when the renderer closes', async () => {
+  it('rejects and cleans up when the BrowserWindow closes and webContents becomes unavailable', async () => {
     const { requestTerminalTabCloseFromRenderer } =
       await import('./terminal-tab-close-request-relay')
     const webContents = Object.assign(new EventEmitter(), {
       isDestroyed: () => false,
       send: vi.fn()
     })
+    let windowClosed = false
     const mainWindow = Object.assign(new EventEmitter(), {
-      isDestroyed: () => false,
-      webContents
+      isDestroyed: () => false
+    })
+    Object.defineProperty(mainWindow, 'webContents', {
+      get: () => {
+        if (windowClosed) {
+          throw new Error('webContents unavailable after close')
+        }
+        return webContents
+      }
     })
     // oxlint-disable-next-line typescript/consistent-type-assertions -- SAFETY: the EventEmitter test double implements the BrowserWindow events used by this test.
     const pending = requestTerminalTabCloseFromRenderer(mainWindow as never, 'tab-closed')
     expect(ipcEmitter.listenerCount('ui:terminalTabCloseResponse')).toBe(1)
 
+    windowClosed = true
     mainWindow.emit('closed')
 
     await expect(pending).rejects.toThrow('renderer_unavailable')
     expect(ipcEmitter.listenerCount('ui:terminalTabCloseResponse')).toBe(0)
+    expect(webContents.listenerCount('destroyed')).toBe(0)
+    expect(webContents.listenerCount('render-process-gone')).toBe(0)
   })
 })
diff --git a/src/main/window/terminal-tab-close-request-relay.ts b/src/main/window/terminal-tab-close-request-relay.ts
index 0701bbfb7e9..d70f6d2525d 100644
--- a/src/main/window/terminal-tab-close-request-relay.ts
+++ b/src/main/window/terminal-tab-close-request-relay.ts
@@ -14,7 +14,11 @@ export async function requestTerminalTabCloseFromRenderer(
   tabId: string,
   options: { localPtyTeardownOwnedExternally?: boolean; force?: boolean } = {}
 ): Promise<void> {
-  if (mainWindow.isDestroyed() || mainWindow.webContents.isDestroyed()) {
+  if (mainWindow.isDestroyed()) {
+    throw new Error('renderer_unavailable')
+  }
+  const webContents = mainWindow.webContents
+  if (webContents.isDestroyed()) {
     throw new Error('renderer_unavailable')
   }
   const requestId = randomUUID()
@@ -31,9 +35,9 @@ export async function requestTerminalTabCloseFromRenderer(
       if (typeof mainWindow.removeListener === 'function') {
         mainWindow.removeListener('closed', onRendererUnavailable)
       }
-      if (typeof mainWindow.webContents.removeListener === 'function') {
-        mainWindow.webContents.removeListener('destroyed', onRendererUnavailable)
-        mainWindow.webContents.removeListener('render-process-gone', onRendererUnavailable)
+      if (typeof webContents.removeListener === 'function') {
+        webContents.removeListener('destroyed', onRendererUnavailable)
+        webContents.removeListener('render-process-gone', onRendererUnavailable)
       }
       if (error) {
         reject(error)
@@ -48,7 +52,7 @@ export async function requestTerminalTabCloseFromRenderer(
     const onResponse = (event: Electron.IpcMainEvent, response: TerminalTabCloseResponse): void => {
       // Why: request IDs are visible to renderer code; only the selected main
       // window may commit or reject its lifecycle transaction.
-      if (event.sender !== mainWindow.webContents || response.requestId !== requestId) {
+      if (event.sender !== webContents || response.requestId !== requestId) {
         return
       }
       if (response.error) {
@@ -61,13 +65,13 @@ export async function requestTerminalTabCloseFromRenderer(
     if (typeof mainWindow.once === 'function') {
       mainWindow.once('closed', onRendererUnavailable)
     }
-    if (typeof mainWindow.webContents.once === 'function') {
-      mainWindow.webContents.once('destroyed', onRendererUnavailable)
-      mainWindow.webContents.once('render-process-gone', onRendererUnavailable)
+    if (typeof webContents.once === 'function') {
+      webContents.once('destroyed', onRendererUnavailable)
+      webContents.once('render-process-gone', onRendererUnavailable)
     }
     const request: TerminalTabCloseRequest = { requestId, tabId, ...options }
     try {
-      mainWindow.webContents.send('ui:terminalTabCloseRequest', request)
+      webContents.send('ui:terminalTabCloseRequest', request)
     } catch {
       finish(new Error('renderer_unavailable'))
     }