diff --git a/mobile/src/terminal/use-terminal-live-accessory-input-commit.test.ts b/mobile/src/terminal/use-terminal-live-accessory-input-commit.test.ts
index 1ca5216c7a8..3ae65ca12ec 100644
--- a/mobile/src/terminal/use-terminal-live-accessory-input-commit.test.ts
+++ b/mobile/src/terminal/use-terminal-live-accessory-input-commit.test.ts
@@ -38,6 +38,7 @@ function suppressReactTestRendererDeprecationWarning(): () => void {
 }
 
 type AccessoryInputCommitHarnessOptions = {
+  readonly compositionHandle?: string | null
   readonly heldText?: string
   readonly sentText?: string
   readonly pendingHandle?: string | null
@@ -58,6 +59,7 @@ type AccessoryInputCommitHarness = {
 }
 
 function createAccessoryInputCommitHarness({
+  compositionHandle = null,
   heldText = '',
   sentText = '',
   pendingHandle = null,
@@ -70,6 +72,9 @@ function createAccessoryInputCommitHarness({
   const sentLiveInputTextRef: RefObject<string> = { current: sentText }
   const pendingLiveInputHandleRef: RefObject<string | null> = { current: pendingHandle }
   const liveInputRef: RefObject<TextInput | null> = { current: null }
+  const liveInputCompositionHandleRef: RefObject<string | null> = {
+    current: compositionHandle
+  }
   const liveInputTerminalHandles = new Set([activeHandle])
   const sent: string[] = []
   const sendLiveTerminalInputRef: RefObject<TerminalLiveInputSender> = {
@@ -95,6 +100,7 @@ function createAccessoryInputCommitHarness({
       flushPendingLiveInputText,
       heldLiveInputTextRef,
       liveInputRef,
+      liveInputCompositionHandleRef,
       liveInputTerminalHandles,
       pendingLiveInputHandleRef,
       sentLiveInputTextRef,
@@ -165,6 +171,16 @@ describe('terminal live accessory inactive input commit result', () => {
 })
 
 describe('terminal live accessory input commit hook', () => {
+  it('Given native marked text When an accessory key is pressed Then suppresses raw input', async () => {
+    const harness = createAccessoryInputCommitHarness({ compositionHandle: 'terminal-a' })
+
+    const result = await harness.commit({ bytes: '\x1b' })
+
+    expect(result).toEqual({ kind: 'suppress-raw' })
+    expect(harness.waitForPendingLiveInputFlush).not.toHaveBeenCalled()
+    expect(harness.sent).toEqual([])
+  })
+
   it('Given raw accessory bytes with a held syllable When committed Then flushes held text before sending bytes', async () => {
     // Given
     const harness = createAccessoryInputCommitHarness({
diff --git a/mobile/src/terminal/use-terminal-live-accessory-input-commit.ts b/mobile/src/terminal/use-terminal-live-accessory-input-commit.ts
index 0893ae16098..bfba227ab17 100644
--- a/mobile/src/terminal/use-terminal-live-accessory-input-commit.ts
+++ b/mobile/src/terminal/use-terminal-live-accessory-input-commit.ts
@@ -26,6 +26,7 @@ type TerminalLiveAccessoryInputCommitOptions = {
   readonly flushPendingLiveInputText: (expectedHandle: string | null) => Promise<boolean>
   readonly heldLiveInputTextRef: RefObject<string>
   readonly liveInputRef: RefObject<TextInput | null>
+  readonly liveInputCompositionHandleRef: RefObject<string | null>
   readonly liveInputTerminalHandles: ReadonlySet<string>
   readonly pendingLiveInputHandleRef: RefObject<string | null>
   readonly sentLiveInputTextRef: RefObject<string>
@@ -41,6 +42,7 @@ export function useTerminalLiveAccessoryInputCommit({
   flushPendingLiveInputText,
   heldLiveInputTextRef,
   liveInputRef,
+  liveInputCompositionHandleRef,
   liveInputTerminalHandles,
   pendingLiveInputHandleRef,
   sentLiveInputTextRef,
@@ -58,6 +60,9 @@ export function useTerminalLiveAccessoryInputCommit({
       if (!liveInputTerminalHandles.has(activeHandle)) {
         return getTerminalLiveAccessoryInactiveInputCommitResult(waitForPendingLiveInputFlush)
       }
+      if (liveInputCompositionHandleRef.current === activeHandle) {
+        return { kind: 'suppress-raw' }
+      }
       const ownsPendingState = pendingLiveInputHandleRef.current === activeHandle
       if (pendingLiveInputHandleRef.current && !ownsPendingState) {
         clearPendingLiveInputCommit()
@@ -102,6 +107,7 @@ export function useTerminalLiveAccessoryInputCommit({
       flushPendingLiveInputText,
       heldLiveInputTextRef,
       liveInputRef,
+      liveInputCompositionHandleRef,
       liveInputTerminalHandles,
       pendingLiveInputHandleRef,
       sentLiveInputTextRef,
diff --git a/mobile/src/terminal/use-terminal-live-input-commit.test.ts b/mobile/src/terminal/use-terminal-live-input-commit.test.ts
index bd82851bfd6..f41d30f41f4 100644
--- a/mobile/src/terminal/use-terminal-live-input-commit.test.ts
+++ b/mobile/src/terminal/use-terminal-live-input-commit.test.ts
@@ -10,6 +10,8 @@ type TerminalLiveInputCommitHarness = {
   readonly captures: readonly string[]
   readonly handlers: ReturnType<typeof useTerminalLiveInputCommit<string>>
   readonly sent: readonly string[]
+  readonly sentByHandle: readonly { readonly bytes: string; readonly handle: string }[]
+  readonly setActiveHandle: (next: string) => void
   readonly setActiveSessionTabType: (next: string | undefined) => void
   readonly setConnected: (next: boolean) => void
   readonly setSendResult: (next: boolean) => void
@@ -35,23 +37,25 @@ function suppressReactTestRendererDeprecationWarning(): () => void {
 function createTerminalLiveInputCommitHarness({
   sendResult = true
 }: TerminalLiveInputCommitHarnessOptions = {}): TerminalLiveInputCommitHarness {
-  const activeHandle = 'terminal-a'
-  const activeHandleRef: RefObject<string | null> = { current: activeHandle }
+  let currentActiveHandle = 'terminal-a'
+  const activeHandleRef: RefObject<string | null> = { current: currentActiveHandle }
   const activeSessionTabTypeRef: RefObject<string | null> = { current: 'terminal' }
   const captures: string[] = []
   const setLiveInputCapture = (text: string): void => {
     captures.push(text)
   }
   const liveInputRef: RefObject<TextInput | null> = { current: null }
-  const liveInputTerminalHandles = new Set([activeHandle])
+  const liveInputTerminalHandles = new Set(['terminal-a', 'terminal-b'])
   const liveInputTerminalHandlesRef: RefObject<Set<string>> = {
-    current: new Set([activeHandle])
+    current: new Set(liveInputTerminalHandles)
   }
   const sent: string[] = []
+  const sentByHandle: { bytes: string; handle: string }[] = []
   let currentSendResult = sendResult
   const sendLiveTerminalInputRef: RefObject<TerminalLiveInputSender> = {
-    current: async (_handle, bytes) => {
+    current: async (handle, bytes) => {
       sent.push(bytes)
+      sentByHandle.push({ bytes, handle })
       return currentSendResult
     }
   }
@@ -63,7 +67,7 @@ function createTerminalLiveInputCommitHarness({
 
   function Harness(): null {
     handlers = useTerminalLiveInputCommit({
-      activeHandle,
+      activeHandle: currentActiveHandle,
       activeHandleRef,
       activeSessionTabType: currentActiveSessionTabType,
       activeSessionTabTypeRef,
@@ -91,8 +95,21 @@ function createTerminalLiveInputCommitHarness({
 
   return {
     captures,
-    handlers,
+    get handlers() {
+      if (!handlers) {
+        throw new Error('terminal live input hook is not mounted')
+      }
+      return handlers
+    },
     sent,
+    sentByHandle,
+    setActiveHandle: (next: string): void => {
+      currentActiveHandle = next
+      activeHandleRef.current = next
+      act(() => {
+        renderer?.update(createElement(Harness))
+      })
+    },
     setActiveSessionTabType: (next: string | undefined): void => {
       currentActiveSessionTabType = next
       // Ref and prop derive from the same activeSessionTab in the real route, so
@@ -241,6 +258,72 @@ describe('terminal live input commit hook', () => {
     await vi.waitFor(() => expect(sent).toEqual(['かな']))
   })
 
+  it('Given marked text When the active terminal switches Then clears it without sending', () => {
+    const harness = createTerminalLiveInputCommitHarness()
+    changeLiveInput(harness.handlers, 'かな', true)
+
+    harness.setActiveHandle('terminal-b')
+
+    expect(harness.captures).toEqual(['かな', ''])
+    expect(harness.sent).toEqual([])
+  })
+
+  it('Given a switch during marked text When its final event arrives Then rejects it for the new terminal', async () => {
+    const harness = createTerminalLiveInputCommitHarness()
+    changeLiveInput(harness.handlers, 'かな', true)
+    harness.setActiveHandle('terminal-b')
+
+    changeLiveInput(harness.handlers, '仮名', false)
+
+    await Promise.resolve()
+    expect(harness.captures.at(-1)).toBe('')
+    expect(harness.sentByHandle).toEqual([])
+  })
+
+  it('Given active marked text When an external send requests a flush Then suppresses it until commit', async () => {
+    const harness = createTerminalLiveInputCommitHarness()
+    changeLiveInput(harness.handlers, 'かな', true)
+
+    await expect(
+      harness.handlers.flushPendingLiveInputBeforeExternalSend('terminal-a')
+    ).resolves.toBe(false)
+    expect(harness.sent).toEqual([])
+
+    changeLiveInput(harness.handlers, '仮名', false)
+    await vi.waitFor(() => expect(harness.sent).toEqual(['仮名']))
+    await expect(
+      harness.handlers.flushPendingLiveInputBeforeExternalSend('terminal-a')
+    ).resolves.toBe(true)
+  })
+
+  it('Given active marked text When an accessory key is pressed Then suppresses it until commit', async () => {
+    const harness = createTerminalLiveInputCommitHarness()
+    changeLiveInput(harness.handlers, 'かな', true)
+
+    await expect(
+      harness.handlers.handleLiveInputAccessoryBytes({ bytes: '\x1b' })
+    ).resolves.toEqual({ kind: 'suppress-raw' })
+
+    changeLiveInput(harness.handlers, '仮名', false)
+    await vi.waitFor(() => expect(harness.sent).toEqual(['仮名']))
+    await expect(
+      harness.handlers.handleLiveInputAccessoryBytes({ bytes: '\x1b' })
+    ).resolves.toEqual({ kind: 'allow-raw' })
+  })
+
+  it('Given a switch clears marked text When controls target the new terminal Then allows them', async () => {
+    const harness = createTerminalLiveInputCommitHarness()
+    changeLiveInput(harness.handlers, 'かな', true)
+    harness.setActiveHandle('terminal-b')
+
+    await expect(
+      harness.handlers.flushPendingLiveInputBeforeExternalSend('terminal-b')
+    ).resolves.toBe(true)
+    await expect(
+      harness.handlers.handleLiveInputAccessoryBytes({ bytes: '\x1b' })
+    ).resolves.toEqual({ kind: 'allow-raw' })
+  })
+
   it('Given active composition When native control events arrive Then keeps them inside the IME', () => {
     const { handlers, sent } = createTerminalLiveInputCommitHarness()
     changeLiveInput(handlers, 'かな', true)
diff --git a/mobile/src/terminal/use-terminal-live-input-commit.ts b/mobile/src/terminal/use-terminal-live-input-commit.ts
index 4f19e5dd5bf..31fb43072e2 100644
--- a/mobile/src/terminal/use-terminal-live-input-commit.ts
+++ b/mobile/src/terminal/use-terminal-live-input-commit.ts
@@ -60,7 +60,8 @@ export function useTerminalLiveInputCommit<TTabType extends string>({
   sendLiveTerminalInputRef,
   setLiveInputCapture
 }: TerminalLiveInputCommitOptions<TTabType>): TerminalLiveInputCommitHandlers {
-  const liveInputComposingRef = useRef(false)
+  const liveInputCompositionHandleRef = useRef<string | null>(null)
+  const staleLiveInputCompositionHandleRef = useRef<string | null>(null)
   const {
     applyLiveInputMirror,
     clearPendingLiveInputCommit: clearPendingLiveInputMirror,
@@ -79,7 +80,10 @@ export function useTerminalLiveInputCommit<TTabType extends string>({
   })
 
   const clearPendingLiveInputCommit = useCallback(() => {
-    liveInputComposingRef.current = false
+    if (liveInputCompositionHandleRef.current) {
+      staleLiveInputCompositionHandleRef.current = liveInputCompositionHandleRef.current
+      liveInputCompositionHandleRef.current = null
+    }
     clearPendingLiveInputMirror()
   }, [clearPendingLiveInputMirror])
 
@@ -92,7 +96,9 @@ export function useTerminalLiveInputCommit<TTabType extends string>({
 
   useEffect(() => {
     const pendingHandle = pendingLiveInputHandleRef.current
-    if (!pendingHandle) {
+    const compositionHandle = liveInputCompositionHandleRef.current
+    const inputOwnerHandle = compositionHandle ?? pendingHandle
+    if (!inputOwnerHandle) {
       return
     }
     // Why: a lagging mobile tab list briefly yields no active tab object; a
@@ -100,7 +106,7 @@ export function useTerminalLiveInputCommit<TTabType extends string>({
     // still block sends if the tab truly changed.
     if (
       !activeHandle ||
-      pendingHandle !== activeHandle ||
+      inputOwnerHandle !== activeHandle ||
       (activeSessionTabType != null && activeSessionTabType !== 'terminal') ||
       !liveInputTerminalHandles.has(activeHandle)
     ) {
@@ -110,6 +116,10 @@ export function useTerminalLiveInputCommit<TTabType extends string>({
 
   const flushPendingLiveInputBeforeExternalSend = useCallback(
     async (handle: string): Promise<boolean> => {
+      // Marked text belongs to the native IME until its final onChange event.
+      if (liveInputCompositionHandleRef.current === handle) {
+        return false
+      }
       const pendingHandle = pendingLiveInputHandleRef.current
       if (pendingHandle && pendingHandle !== handle) {
         clearPendingLiveInputCommit()
@@ -131,14 +141,29 @@ export function useTerminalLiveInputCommit<TTabType extends string>({
         clearPendingLiveInputCommit()
         return
       }
+      if (isComposing === true) {
+        staleLiveInputCompositionHandleRef.current = null
+        liveInputCompositionHandleRef.current = activeHandle
+        setLiveInputCapture(text)
+        return
+      }
+
+      const compositionHandle = liveInputCompositionHandleRef.current
+      if (
+        (compositionHandle && compositionHandle !== activeHandle) ||
+        (!compositionHandle && staleLiveInputCompositionHandleRef.current)
+      ) {
+        liveInputCompositionHandleRef.current = null
+        staleLiveInputCompositionHandleRef.current = null
+        clearPendingLiveInputMirror()
+        return
+      }
       // Why: iOS kills an active dictation/IME session when JS writes a value
       // that differs from the native field text, so the controlled capture must
       // echo the field verbatim; only the PTY mirror sees normalized text.
+      liveInputCompositionHandleRef.current = null
+      staleLiveInputCompositionHandleRef.current = null
       setLiveInputCapture(text)
-      liveInputComposingRef.current = isComposing === true
-      if (liveInputComposingRef.current) {
-        return
-      }
       applyLiveInputMirror(activeHandle, normalizeTerminalTextInput(text))
     },
     [
@@ -155,7 +180,7 @@ export function useTerminalLiveInputCommit<TTabType extends string>({
       if (
         !activeHandle ||
         !liveInputTerminalHandles.has(activeHandle) ||
-        liveInputComposingRef.current
+        liveInputCompositionHandleRef.current === activeHandle
       ) {
         return
       }
@@ -201,6 +226,7 @@ export function useTerminalLiveInputCommit<TTabType extends string>({
     activeHandle,
     applyLiveInputMirror,
     clearPendingLiveInputCommit,
+    liveInputCompositionHandleRef,
     flushPendingLiveInputText,
     heldLiveInputTextRef,
     liveInputRef,
@@ -216,7 +242,7 @@ export function useTerminalLiveInputCommit<TTabType extends string>({
     if (
       !activeHandle ||
       !liveInputTerminalHandles.has(activeHandle) ||
-      liveInputComposingRef.current
+      liveInputCompositionHandleRef.current === activeHandle
     ) {
       return
     }