diff --git a/bin/thread-listener.py b/bin/thread-listener.py
new file mode 100755
index 0000000..18bfabc
--- /dev/null
+++ b/bin/thread-listener.py
@@ -0,0 +1,102 @@
+#!/usr/bin/env python3
+"""
+THREAD listener: Auto-executes 646's THREAD commands
+
+Polls 646's main chat for THREAD commands, executes via headless.
+Format: THREAD <agent> <main|chat_id> <message>
+
+Watermark prevents duplicate execution.
+"""
+import subprocess
+import time
+import json
+import re
+from pathlib import Path
+
+API = "/home/super/Projects/NetVM/bin/muse-chat-api.py"
+NETVM_EXEC = "/home/super/Projects/NetVM/bin/netvm-exec.sh"
+WATERMARK_FILE = Path("/home/super/Projects/NetVM/bridge/thread-watermark.json")
+
+def load_watermark():
+    if WATERMARK_FILE.exists():
+        with open(WATERMARK_FILE) as f:
+            return json.load(f)
+    return {"last_processed": None}
+
+def save_watermark(data):
+    WATERMARK_FILE.parent.mkdir(parents=True, exist_ok=True)
+    with open(WATERMARK_FILE, 'w') as f:
+        json.dump(data, f, indent=2)
+
+def run(cmd, timeout=60):
+    result = subprocess.run(cmd, shell=True, capture_output=True, text=True, timeout=timeout)
+    return result.stdout.strip()
+
+def get_646_messages():
+    return run(f"{NETVM_EXEC} 646 -- python3 {API} --account 646 messages 5")
+
+def execute_thread(agent, target, message):
+    """Execute a THREAD command via headless."""
+    print(f"THREAD: {agent} -> {target}: {message[:60]}...")
+    
+    # Navigate to target
+    if target == "main":
+        run(f"{NETVM_EXEC} {agent} -- python3 {API} --account {agent} sidechat main")
+    else:
+        # Assume it's a chat_id, navigate to thread
+        run(f"{NETVM_EXEC} {agent} -- python3 {API} --account {agent} sidechat use {target}")
+    
+    time.sleep(2)
+    
+    # Send message with 646 attribution
+    safe = message.replace('"', '\\"').replace('$', '\\$').replace('`', '\\`')[:500]
+    run(f'{NETVM_EXEC} {agent} -- python3 {API} --account {agent} send "[646] {safe}"')
+    
+    # Back to main
+    run(f"{NETVM_EXEC} {agent} -- python3 {API} --account {agent} sidechat main")
+    print("Done")
+
+def poll_once():
+    wm = load_watermark()
+    msgs = get_646_messages()
+    
+    # Find THREAD commands (not yet processed)
+    # Simple: look for "THREAD " at start of a message part
+    parts = [p.strip() for p in msgs.split('---') if p.strip()]
+    
+    for part in parts:
+        # Match THREAD <agent> <target> <message>
+        m = re.match(r'THREAD\s+(\w+)\s+(\w+)\s+(.+)', part, re.DOTALL)
+        if m:
+            agent, target, message = m.groups()
+            # Create a simple ID for deduplication
+            cmd_id = f"{agent}:{target}:{message[:30]}"
+            if cmd_id == wm.get("last_processed"):
+                continue  # Already processed
+            
+            # Validate agent
+            if agent not in ["muse", "pip", "646"]:
+                print(f"Unknown agent: {agent}, skipping")
+                continue
+            
+            try:
+                execute_thread(agent, target, message.strip())
+                wm["last_processed"] = cmd_id
+                save_watermark(wm)
+            except Exception as e:
+                print(f"THREAD failed: {e}")
+
+if __name__ == '__main__':
+    import sys
+    if '--once' in sys.argv:
+        poll_once()
+    elif '--daemon' in sys.argv:
+        print("THREAD listener running (poll every 60s)...")
+        while True:
+            try:
+                poll_once()
+            except Exception as e:
+                print(f"Poll error: {e}")
+            time.sleep(60)
+    else:
+        print("Use --once or --daemon")