diff --git a/src/lib/config.server.ts b/src/lib/config.server.ts
index 3978873be..844c16bbc 100644
--- a/src/lib/config.server.ts
+++ b/src/lib/config.server.ts
@@ -106,6 +106,10 @@ export const SLACK_USER_FEEDBACK_WEBHOOK_URL = getEnvVariable('SLACK_USER_FEEDBA
 // Posts deploy threat alerts to a dedicated Slack channel.
 // Expected to be a Slack Incoming Webhook URL.
 export const SLACK_DEPLOY_THREAT_WEBHOOK_URL = getEnvVariable('SLACK_DEPLOY_THREAT_WEBHOOK_URL');
+// Bot token + channel for internal Kilo feedback notifications via chat.postMessage.
+// The bot token must have the chat:write scope.
+export const SLACK_FEEDBACK_BOT_TOKEN = getEnvVariable('SLACK_FEEDBACK_BOT_TOKEN');
+export const SLACK_FEEDBACK_CHANNEL_ID = getEnvVariable('SLACK_FEEDBACK_CHANNEL_ID');
 export const ENABLE_MILVUS_DUAL_WRITE = true;
 
 // AI Attribution Service
diff --git a/src/lib/feedback/app-builder-feedback-slack.ts b/src/lib/feedback/app-builder-feedback-slack.ts
new file mode 100644
index 000000000..4fd30731b
--- /dev/null
+++ b/src/lib/feedback/app-builder-feedback-slack.ts
@@ -0,0 +1,53 @@
+import 'server-only';
+
+import {
+  postInternalSlackMessage,
+  postInternalSlackThreadReply,
+} from '@/lib/slack/internal-notifications';
+
+const FEEDBACK_PREVIEW_LIMIT = 500;
+
+/**
+ * Sends an app builder feedback notification to the internal Kilo Slack channel.
+ * If the feedback text exceeds the preview limit, the full text is posted as a thread reply.
+ * Fire-and-forget safe — catches and logs all errors.
+ */
+export async function notifyAppBuilderFeedback(
+  projectId: string,
+  feedbackText: string
+): Promise<void> {
+  const adminLink = `https://app.kilo.ai/admin/app-builder/${projectId}`;
+  const trimmedFeedback = feedbackText.trim();
+  const wasTruncated = trimmedFeedback.length > FEEDBACK_PREVIEW_LIMIT;
+  const previewText =
+    trimmedFeedback.slice(0, FEEDBACK_PREVIEW_LIMIT) + (wasTruncated ? '...' : '');
+
+  try {
+    const ts = await postInternalSlackMessage(
+      [
+        {
+          type: 'header',
+          text: {
+            type: 'plain_text',
+            text: 'New App Builder feedback :hammer_and_wrench:',
+          },
+        },
+        {
+          type: 'section',
+          text: { type: 'mrkdwn', text: `<${adminLink}|View project>` },
+        },
+        {
+          type: 'section',
+          text: { type: 'plain_text', text: previewText },
+        },
+      ],
+      'New App Builder feedback'
+    );
+
+    if (wasTruncated && ts) {
+      await postInternalSlackThreadReply(ts, trimmedFeedback);
+    }
+  } catch (error) {
+    console.error('[AppBuilderFeedback] Failed to post to Slack', error);
+  }
+}
diff --git a/src/lib/slack/internal-notifications.ts b/src/lib/slack/internal-notifications.ts
new file mode 100644
index 000000000..3bb29c6e2
--- /dev/null
+++ b/src/lib/slack/internal-notifications.ts
@@ -0,0 +1,57 @@
+import 'server-only';
+
+import { WebClient } from '@slack/web-api';
+import type { Block, KnownBlock } from '@slack/web-api';
+import { SLACK_FEEDBACK_BOT_TOKEN, SLACK_FEEDBACK_CHANNEL_ID } from '@/lib/config.server';
+
+function makeClient(): WebClient {
+  if (!SLACK_FEEDBACK_BOT_TOKEN) {
+    throw new Error('SLACK_FEEDBACK_BOT_TOKEN is not configured');
+  }
+  return new WebClient(SLACK_FEEDBACK_BOT_TOKEN);
+}
+
+/**
+ * Posts a message to the internal Kilo Slack feedback channel.
+ * Returns the message ts on success (needed for threading), or undefined if not configured.
+ * Throws on API errors.
+ */
+export async function postInternalSlackMessage(
+  blocks: (Block | KnownBlock)[],
+  fallbackText: string
+): Promise<string | undefined> {
+  if (!SLACK_FEEDBACK_BOT_TOKEN || !SLACK_FEEDBACK_CHANNEL_ID) {
+    return undefined;
+  }
+
+  const client = makeClient();
+  const result = await client.chat.postMessage({
+    channel: SLACK_FEEDBACK_CHANNEL_ID,
+    text: fallbackText,
+    unfurl_links: false,
+    unfurl_media: false,
+    blocks,
+  });
+
+  return result.ts;
+}
+
+/**
+ * Posts a thread reply to an existing message in the internal Kilo Slack feedback channel.
+ * Throws on API errors.
+ */
+export async function postInternalSlackThreadReply(
+  threadTs: string,
+  text: string
+): Promise<void> {
+  if (!SLACK_FEEDBACK_BOT_TOKEN || !SLACK_FEEDBACK_CHANNEL_ID) {
+    return;
+  }
+
+  const client = makeClient();
+  await client.chat.postMessage({
+    channel: SLACK_FEEDBACK_CHANNEL_ID,
+    thread_ts: threadTs,
+    text,
+  });
+}
diff --git a/src/routers/app-builder-feedback-router.ts b/src/routers/app-builder-feedback-router.ts
index 39bd30692..447576ba4 100644
--- a/src/routers/app-builder-feedback-router.ts
+++ b/src/routers/app-builder-feedback-router.ts
@@ -6,7 +6,7 @@ import { app_builder_feedback } from '@/db/schema';
 import { getProjectWithOwnershipCheck } from '@/lib/app-builder/app-builder-service';
 import { ensureOrganizationAccess } from '@/routers/organizations/utils';
 import * as z from 'zod';
-import { SLACK_USER_FEEDBACK_WEBHOOK_URL } from '@/lib/config.server';
+import { notifyAppBuilderFeedback } from '@/lib/feedback/app-builder-feedback-slack';
 import type { Owner } from '@/lib/integrations/core/types';
 
 const recentMessageSchema = z.object({
@@ -57,47 +57,9 @@ export const appBuilderFeedbackRouter = createTRPCRouter({
         .returning({ id: app_builder_feedback.id });
 
       // Best-effort Slack notification
-      if (SLACK_USER_FEEDBACK_WEBHOOK_URL) {
-        const adminLink = `https://app.kilo.ai/admin/app-builder/${input.project_id}`;
-        const trimmedFeedback = input.feedback_text.trim();
-        const wasTruncated = trimmedFeedback.length > 500;
-        const feedbackText = trimmedFeedback.slice(0, 500) + (wasTruncated ? '...' : '');
-
-        fetch(SLACK_USER_FEEDBACK_WEBHOOK_URL, {
-          method: 'POST',
-          headers: { 'Content-Type': 'application/json' },
-          body: JSON.stringify({
-            text: 'New App Builder feedback',
-            unfurl_links: false,
-            unfurl_media: false,
-            blocks: [
-              {
-                type: 'header',
-                text: {
-                  type: 'plain_text',
-                  text: 'New App Builder feedback :hammer_and_wrench:',
-                },
-              },
-              {
-                type: 'section',
-                text: {
-                  type: 'mrkdwn',
-                  text: `<${adminLink}|View project>`,
-                },
-              },
-              {
-                type: 'section',
-                text: {
-                  type: 'plain_text',
-                  text: feedbackText,
-                },
-              },
-            ],
-          }),
-        }).catch(error => {
-          console.error('[AppBuilderFeedback] Failed to post to Slack webhook', error);
-        });
-      }
+      notifyAppBuilderFeedback(input.project_id, input.feedback_text).catch(error => {
+        console.error('[AppBuilderFeedback] Failed to post to Slack', error);
+      });
 
       return inserted;
     }),