diff --git a/packages/ui/src/components/tree/TreeItem.tsx b/packages/ui/src/components/tree/TreeItem.tsx
index 6898d114..3f14ffd7 100644
--- a/packages/ui/src/components/tree/TreeItem.tsx
+++ b/packages/ui/src/components/tree/TreeItem.tsx
@@ -20,6 +20,7 @@ import {
 } from "./context";
 import type { TreeNode } from "./common";
 import { getNodeKey } from "./common";
+import { isImeCompositionEvent } from "./keyboard";
 import type { TreeProps } from "./Tree";
 import { TreeIndentGuide } from "./TreeIndentGuide";
 
@@ -170,6 +171,8 @@ function TreeItem_<T extends { id: string }>({
   const handleEditKeyDown = useCallback(
     async (e: ReactKeyboardEvent<HTMLInputElement>) => {
       e.stopPropagation(); // Don't trigger other tree keys (like arrows)
+      if (isImeCompositionEvent(e.nativeEvent)) return;
+
       switch (e.key) {
         case "Enter":
           if (editing) {
diff --git a/packages/ui/src/components/tree/keyboard.test.ts b/packages/ui/src/components/tree/keyboard.test.ts
new file mode 100644
index 00000000..de7c0fe0
--- /dev/null
+++ b/packages/ui/src/components/tree/keyboard.test.ts
@@ -0,0 +1,20 @@
+import { describe, expect, test } from "vite-plus/test";
+import { isImeCompositionEvent } from "./keyboard";
+
+describe("isImeCompositionEvent", () => {
+  test("detects an active standards-based composition", () => {
+    expect(isImeCompositionEvent({ isComposing: true, keyCode: 13 })).toBe(true);
+  });
+
+  test("detects the Safari/WebKit key code fallback", () => {
+    expect(isImeCompositionEvent({ isComposing: false, keyCode: 229 })).toBe(true);
+  });
+
+  test("does not classify an ordinary Enter keydown as composition", () => {
+    expect(isImeCompositionEvent({ isComposing: false, keyCode: 13 })).toBe(false);
+  });
+
+  test("does not classify an ordinary Escape keydown as composition", () => {
+    expect(isImeCompositionEvent({ isComposing: false, keyCode: 27 })).toBe(false);
+  });
+});
diff --git a/packages/ui/src/components/tree/keyboard.ts b/packages/ui/src/components/tree/keyboard.ts
new file mode 100644
index 00000000..beecf099
--- /dev/null
+++ b/packages/ui/src/components/tree/keyboard.ts
@@ -0,0 +1,7 @@
+export type ImeKeyboardEvent = Pick<KeyboardEvent, "isComposing" | "keyCode">;
+
+export function isImeCompositionEvent(event: ImeKeyboardEvent): boolean {
+  // Safari can clear `isComposing` on the keydown that finishes composition.
+  // `229` is retained as the compatibility signal that an IME is processing it.
+  return event.isComposing || event.keyCode === 229;
+}