diff --git a/src/watcher-manager.js b/src/watcher-manager.js
index 76b0f2b..6be0ac2 100644
--- a/src/watcher-manager.js
+++ b/src/watcher-manager.js
@@ -262,6 +262,14 @@ async function startDaemon() {
       return;
     }
 
+    // Skip heartbeat/internal sessions (agent:main:main, agent:main:cli, etc.)
+    // These have no real Mattermost conversation context and produce spurious status boxes.
+    // A heartbeat session key ends with ':main' and has no channel/thread suffix.
+    if (/^agent:[^:]+:main$/.test(sessionKey) || /^agent:[^:]+:cli$/.test(sessionKey)) {
+      logger.debug({ sessionKey }, 'Heartbeat/internal session — skipping status box');
+      return;
+    }
+
     // Enforce MAX_ACTIVE_SESSIONS
     if (activeBoxes.size >= config.maxActiveSessions) {
       logger.warn(