diff --git a/src/client/components/post-form.vue b/src/client/components/post-form.vue
index f0de602c2..307501b78 100644
--- a/src/client/components/post-form.vue
+++ b/src/client/components/post-form.vue
@@ -69,6 +69,7 @@ import getAcct from '../../misc/acct/render';
 import { formatTimeString } from '../../misc/format-time-string';
 import { selectDriveFile } from '../scripts/select-drive-file';
 import { noteVisibilities } from '../../types';
+import { utils } from '@syuilo/aiscript';
 
 export default Vue.extend({
 	components: {
@@ -533,9 +534,8 @@ export default Vue.extend({
 			localStorage.setItem('drafts', JSON.stringify(data));
 		},
 
-		post() {
-			this.posting = true;
-			this.$root.api('notes/create', {
+		async post() {
+			let data = {
 				text: this.text == '' ? undefined : this.text,
 				fileIds: this.files.length > 0 ? this.files.map(f => f.id) : undefined,
 				replyId: this.reply ? this.reply.id : undefined,
@@ -546,7 +546,17 @@ export default Vue.extend({
 				visibility: this.visibility,
 				visibleUserIds: this.visibility == 'specified' ? this.visibleUsers.map(u => u.id) : undefined,
 				viaMobile: this.$root.isMobile
-			}).then(data => {
+			};
+
+			// plugin
+			if (this.$store.state.notePostInterruptors.length > 0) {
+				for (const interruptor of this.$store.state.notePostInterruptors) {
+					data = utils.valToJs(await interruptor.handler(JSON.parse(JSON.stringify(data))));
+				}
+			}
+
+			this.posting = true;
+			this.$root.api('notes/create', data).then(() => {
 				this.clear();
 				this.deleteDraft();
 				this.$emit('posted');
diff --git a/src/client/scripts/aiscript/api.ts b/src/client/scripts/aiscript/api.ts
index f3ab6c372..d9f311bde 100644
--- a/src/client/scripts/aiscript/api.ts
+++ b/src/client/scripts/aiscript/api.ts
@@ -73,6 +73,9 @@ export function createPluginEnv(vm, opts) {
 		'Plugin:register_note_view_interruptor': values.FN_NATIVE(([handler]) => {
 			vm.$store.commit('registerNoteViewInterruptor', { pluginId: opts.plugin.id, handler });
 		}),
+		'Plugin:register_note_post_interruptor': values.FN_NATIVE(([handler]) => {
+			vm.$store.commit('registerNotePostInterruptor', { pluginId: opts.plugin.id, handler });
+		}),
 		'Plugin:open_url': values.FN_NATIVE(([url]) => {
 			window.open(url.value, '_blank');
 		}),
diff --git a/src/client/store.ts b/src/client/store.ts
index 7046e10f9..0e1611590 100644
--- a/src/client/store.ts
+++ b/src/client/store.ts
@@ -112,6 +112,7 @@ export default () => new Vuex.Store({
 		userActions: [],
 		noteActions: [],
 		noteViewInterruptors: [],
+		notePostInterruptors: [],
 	},
 
 	getters: {
@@ -283,6 +284,14 @@ export default () => new Vuex.Store({
 				}
 			});
 		},
+
+		registerNotePostInterruptor(state, { pluginId, handler }) {
+			state.notePostInterruptors.push({
+				handler: (note) => {
+					return state.pluginContexts.get(pluginId).execFn(handler, [utils.jsToVal(note)]);
+				}
+			});
+		},
 	},
 
 	actions: {