diff --git a/src/extensions/index.ts b/src/extensions/index.ts
index 0610f89..46e35ce 100644
--- a/src/extensions/index.ts
+++ b/src/extensions/index.ts
@@ -8,5 +8,9 @@ export type {
   SidebarExtension,
   RouteExtension,
   SettingsSectionExtension,
+  ChatBeforeSendContext,
+  ChatBeforeSendResult,
+  ChatComposerStatusProps,
+  ChatExtension,
   I18nResources,
 } from './types';
diff --git a/src/extensions/registry.ts b/src/extensions/registry.ts
index b53f6d4..246e83f 100644
--- a/src/extensions/registry.ts
+++ b/src/extensions/registry.ts
@@ -1,10 +1,13 @@
-import i18n from '@/i18n';
+import i18n from 'i18next';
 import type {
   RendererExtension,
   NavItemDef,
   RouteDef,
   SettingsSectionDef,
   SkillDetailMetaProps,
+  ChatComposerStatusProps,
+  ChatBeforeSendContext,
+  ChatBeforeSendResult,
 } from './types';
 import type { ComponentType } from 'react';
 
@@ -62,6 +65,33 @@ class RendererExtensionRegistry {
     return this.extensions.flatMap((ext) => ext.skills?.detailMetaComponents ?? []);
   }
 
+  getChatComposerStatusComponents(): ComponentType<ChatComposerStatusProps>[] {
+    return this.extensions.flatMap((ext) => ext.chat?.composerStatusComponents ?? []);
+  }
+
+  hasChatBeforeSendHooks(): boolean {
+    return this.extensions.some((ext) => (ext.chat?.beforeSend?.length ?? 0) > 0);
+  }
+
+  async runChatBeforeSend(context: ChatBeforeSendContext): Promise<ChatBeforeSendResult> {
+    for (const ext of this.extensions) {
+      for (const hook of ext.chat?.beforeSend ?? []) {
+        try {
+          const result = await hook(context);
+          if (!result.ok) {
+            return result;
+          }
+        } catch (err) {
+          return {
+            ok: false,
+            message: err instanceof Error ? err.message : String(err),
+          };
+        }
+      }
+    }
+    return { ok: true };
+  }
+
   async initializeAll(): Promise<void> {
     for (const ext of this.extensions) {
       try {
diff --git a/src/extensions/types.ts b/src/extensions/types.ts
index a5d5ac4..7052dd6 100644
--- a/src/extensions/types.ts
+++ b/src/extensions/types.ts
@@ -1,5 +1,6 @@
 import type { ComponentType } from 'react';
 import type { Skill } from '../types/skill';
+import type { GatewayStatus } from '../types/gateway';
 
 export interface NavItemDef {
   to: string;
@@ -47,12 +48,36 @@ export interface SkillsExtension {
   detailMetaComponents?: ComponentType<SkillDetailMetaProps>[];
 }
 
+export interface ChatBeforeSendContext {
+  text: string;
+  attachments?: unknown[];
+  targetAgentId?: string | null;
+}
+
+export interface ChatBeforeSendResult {
+  ok: boolean;
+  message?: string;
+}
+
+export interface ChatComposerStatusProps {
+  gatewayStatus: GatewayStatus;
+}
+
+export interface ChatExtension {
+  id: string;
+  composerStatusComponents?: ComponentType<ChatComposerStatusProps>[];
+  beforeSend?: Array<(
+    context: ChatBeforeSendContext,
+  ) => ChatBeforeSendResult | Promise<ChatBeforeSendResult>>;
+}
+
 export interface RendererExtension {
   id: string;
   sidebar?: SidebarExtension;
   routes?: RouteExtension;
   settings?: SettingsSectionExtension;
   skills?: SkillsExtension;
+  chat?: ChatExtension;
   i18nResources?: I18nResources;
   setup?(): void | Promise<void>;
   teardown?(): void;
diff --git a/src/pages/Chat/ChatInput.tsx b/src/pages/Chat/ChatInput.tsx
index c1a479d..9de5437 100644
--- a/src/pages/Chat/ChatInput.tsx
+++ b/src/pages/Chat/ChatInput.tsx
@@ -18,6 +18,8 @@ import { useAgentsStore } from '@/stores/agents';
 import { useChatStore } from '@/stores/chat';
 import type { AgentSummary } from '@/types/agent';
 import { useTranslation } from 'react-i18next';
+import { toast } from 'sonner';
+import { rendererExtensionRegistry } from '@/extensions/registry';
 
 // ── Types ────────────────────────────────────────────────────────
 
@@ -109,6 +111,7 @@ export function ChatInput({ onSend, onStop, disabled = false, sending = false, i
     [agents, targetAgentId],
   );
   const showAgentPicker = mentionableAgents.length > 0;
+  const chatComposerStatusComponents = rendererExtensionRegistry.getChatComposerStatusComponents();
 
   // Auto-resize textarea
   useEffect(() => {
@@ -288,13 +291,28 @@ export function ChatInput({ onSend, onStop, disabled = false, sending = false, i
   const canSend = (input.trim() || attachments.length > 0) && allReady && !disabled && !sending;
   const canStop = sending && !disabled && !!onStop;
 
-  const handleSend = useCallback(() => {
+  const handleSend = useCallback(async () => {
     if (!canSend) return;
     const readyAttachments = attachments.filter(a => a.status === 'ready');
-    // Capture values before clearing — clear input immediately for snappy UX,
-    // but keep attachments available for the async send
     const textToSend = input.trim();
     const attachmentsToSend = readyAttachments.length > 0 ? readyAttachments : undefined;
+
+    if (rendererExtensionRegistry.hasChatBeforeSendHooks()) {
+      const guard = await rendererExtensionRegistry.runChatBeforeSend({
+        text: textToSend,
+        attachments: attachmentsToSend,
+        targetAgentId,
+      });
+      if (!guard.ok) {
+        if (guard.message) {
+          toast.error(guard.message);
+        }
+        return;
+      }
+    }
+
+    // Capture values before clearing — clear input immediately for snappy UX,
+    // but keep attachments available for the async send
     console.log(`[handleSend] text="${textToSend.substring(0, 50)}", attachments=${attachments.length}, ready=${readyAttachments.length}, sending=${!!attachmentsToSend}`);
     if (attachmentsToSend) {
       console.log('[handleSend] Attachment details:', attachmentsToSend.map(a => ({
@@ -530,6 +548,9 @@ export function ChatInput({ onSend, onStop, disabled = false, sending = false, i
                 pid: gatewayStatus.pid ? `| pid: ${gatewayStatus.pid}` : '',
               })}
             </span>
+            {chatComposerStatusComponents.map((Component, index) => (
+              <Component key={`${index}`} gatewayStatus={gatewayStatus} />
+            ))}
           </div>
           {hasFailedAttachments && (
             <Button