diff --git a/.changeset/fep-2635-observe-prevented-actions.md b/.changeset/fep-2635-observe-prevented-actions.md
new file mode 100644
index 000000000..3605281fb
--- /dev/null
+++ b/.changeset/fep-2635-observe-prevented-actions.md
@@ -0,0 +1,5 @@
+---
+"@stackflow/core": minor
+---
+
+Expose the live, action-local `actions.isPrevented()` state to every pre-effect hook without stopping the remaining hooks.
diff --git a/.changeset/fep-2635-skip-prevented-loader-work.md b/.changeset/fep-2635-skip-prevented-loader-work.md
new file mode 100644
index 000000000..b020735bc
--- /dev/null
+++ b/.changeset/fep-2635-skip-prevented-loader-work.md
@@ -0,0 +1,5 @@
+---
+"@stackflow/react": patch
+---
+
+Require `@stackflow/core` v3 and skip loader, preload, and pause work for prevented push and replace actions.
diff --git a/core/src/interfaces/StackflowPluginHook.ts b/core/src/interfaces/StackflowPluginHook.ts
index f2656ef9a..8c3853844 100644
--- a/core/src/interfaces/StackflowPluginHook.ts
+++ b/core/src/interfaces/StackflowPluginHook.ts
@@ -18,6 +18,7 @@ export type StackflowPluginInitHook = (args: {
 export type StackflowPluginPreEffectHook<T> = (args: {
   actionParams: T;
   actions: StackflowActions & {
+    isPrevented: () => boolean;
     preventDefault: () => void;
     overrideActionParams: (params: T) => void;
   };
diff --git a/core/src/utils/triggerPreEffectHooks.ts b/core/src/utils/triggerPreEffectHooks.ts
index 1e0433d3b..a82223c95 100644
--- a/core/src/utils/triggerPreEffectHooks.ts
+++ b/core/src/utils/triggerPreEffectHooks.ts
@@ -47,6 +47,7 @@ export function triggerPreEffectHook<K extends ActionName>(
         actionParams: { ...nextActionParams },
         actions: {
           ...actions,
+          isPrevented: () => isPrevented,
           preventDefault: () => {
             isPrevented = true;
           },
diff --git a/docs/pages/docs/advanced/write-plugin.en.mdx b/docs/pages/docs/advanced/write-plugin.en.mdx
index 7f6582b1a..3aee29605 100644
--- a/docs/pages/docs/advanced/write-plugin.en.mdx
+++ b/docs/pages/docs/advanced/write-plugin.en.mdx
@@ -251,11 +251,14 @@ Pre-effect hooks include `onBeforePush`, `onBeforeReplace`, and `onBeforePop`. P
 |                        |            |                                            |
 | ---------------------- | ---------- | ------------------------------------------ |
 | actions.preventDefault | `function` | Cancel the default behavior.               |
+| actions.isPrevented    | `function` | Check whether the action is prevented.     |
 | actions.getStack       | `function` | Get the current stack state.               |
 | actions.dispatchEvent  | `function` | Add a new event to the core.               |
 | effect                 | `object`   | The effect that triggered the effect hook. |
 </APITable>
 
+Calling `preventDefault()` cancels the default event dispatch, but it does not stop the remaining pre-effect hooks. Those hooks can call `isPrevented()` to observe the current action-local state.
+
 ## Determining initial activity
 
 You can override the existing `initialActivity` behavior through the `overrideInitialEvents` API.
diff --git a/docs/pages/docs/advanced/write-plugin.ko.mdx b/docs/pages/docs/advanced/write-plugin.ko.mdx
index 73ba436d0..456c52bd9 100644
--- a/docs/pages/docs/advanced/write-plugin.ko.mdx
+++ b/docs/pages/docs/advanced/write-plugin.ko.mdx
@@ -259,11 +259,14 @@ Pre-effect 훅에는 `onBeforePush`, `onBeforeReplace`, `onBeforePop`이 있어
 |                        |            |                               |
 | ---------------------- | ---------- | ----------------------------- |
 | actions.preventDefault | `function` | (추가) 기본 동작을 취소해요.         |
+| actions.isPrevented    | `function` | 현재 action의 취소 상태를 확인해요.  |
 | actions.getStack       | `function` | 현재 스택의 상태를 가져올 수 있어요.  |
 | actions.dispatchEvent  | `function` | 코어에 새 이벤트를 추가해요.         |
 | effect                 | `object`   | 해당 이펙트 훅을 촉발시킨 이펙트에요.   |
 </APITable>
 
+`preventDefault()`를 호출하면 기본 이벤트 dispatch는 취소되지만 남은 pre-effect 훅은 계속 실행돼요. 후속 훅은 `isPrevented()`를 호출해 현재 action에 한정된 취소 상태를 확인할 수 있어요.
+
 ## 첫 액티비티 결정하기
 
 `overrideInitialEvents` API를 통해 기존에 존재하는 `initialActivity` 동작을 덮어쓸 수 있어요.
diff --git a/integrations/react/package.json b/integrations/react/package.json
index a111cfa2c..01c80ee6f 100644
--- a/integrations/react/package.json
+++ b/integrations/react/package.json
@@ -46,7 +46,7 @@
   },
   "peerDependencies": {
     "@stackflow/config": "^2.0.0",
-    "@stackflow/core": "^2.0.0 || ^3.0.0",
+    "@stackflow/core": "^3.0.0",
     "@types/react": ">=16.8.0",
     "react": ">=16.8.0"
   },
diff --git a/integrations/react/src/loader/loaderPlugin.tsx b/integrations/react/src/loader/loaderPlugin.tsx
index 59087dd0c..a06623cfe 100644
--- a/integrations/react/src/loader/loaderPlugin.tsx
+++ b/integrations/react/src/loader/loaderPlugin.tsx
@@ -206,10 +206,12 @@ function createBeforeRouteHandler<
   input: StackflowInput<T, R>,
   loadData: (activityName: string, activityParams: {}) => unknown,
 ): OnBeforeRoute {
-  return ({
-    actionParams,
-    actions: { overrideActionParams, pause, resume },
-  }) => {
+  return ({ actionParams, actions }) => {
+    if (actions.isPrevented()) {
+      return;
+    }
+
+    const { overrideActionParams, pause, resume } = actions;
     const { activityName, activityParams, activityContext } = actionParams;
 
     const matchActivity = input.config.activities.find(
diff --git a/yarn.lock b/yarn.lock
index f14bc9ec6..8dd887e02 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6068,7 +6068,7 @@ __metadata:
     typescript: "npm:^5.5.3"
   peerDependencies:
     "@stackflow/config": ^2.0.0
-    "@stackflow/core": ^2.0.0 || ^3.0.0
+    "@stackflow/core": ^3.0.0
     "@types/react": ">=16.8.0"
     react: ">=16.8.0"
   languageName: unknown