diff --git a/hermes_cli/main.py b/hermes_cli/main.py
index 933de9154..ec00a4c09 100644
--- a/hermes_cli/main.py
+++ b/hermes_cli/main.py
@@ -3266,6 +3266,15 @@ def cmd_update(args):
         except Exception:
             pass  # profiles module not available or no profiles
 
+        # Sync Honcho host blocks to all profiles
+        try:
+            from honcho_integration.cli import sync_honcho_profiles_quiet
+            synced = sync_honcho_profiles_quiet()
+            if synced:
+                print(f"\n-> Honcho: synced {synced} profile(s)")
+        except Exception:
+            pass  # honcho not installed or not configured
+
         # Check for config migrations
         print()
         print("→ Checking configuration for new options...")
@@ -4590,6 +4599,7 @@ For more help on a command:
     )
     honcho_subparsers.add_parser("enable", help="Enable Honcho for the active profile")
     honcho_subparsers.add_parser("disable", help="Disable Honcho for the active profile")
+    honcho_subparsers.add_parser("sync", help="Sync Honcho config to all existing profiles")
 
     def cmd_honcho(args):
         from honcho_integration.cli import honcho_command
diff --git a/honcho_integration/cli.py b/honcho_integration/cli.py
index 4945bbb04..66ae56eb8 100644
--- a/honcho_integration/cli.py
+++ b/honcho_integration/cli.py
@@ -144,6 +144,117 @@ def cmd_disable(args) -> None:
     print(f"  Saved to {_config_path()}\n")
 
 
+def cmd_sync(args) -> None:
+    """Sync Honcho config to all existing profiles.
+
+    Scans all Hermes profiles and creates host blocks for any that don't
+    have one yet. Inherits settings from the default host block.
+    """
+    try:
+        from hermes_cli.profiles import list_profiles
+        profiles = list_profiles()
+    except Exception as e:
+        print(f"  Could not list profiles: {e}\n")
+        return
+
+    cfg = _read_config()
+    if not cfg:
+        print("  No Honcho config found. Run 'hermes honcho setup' first.\n")
+        return
+
+    hosts = cfg.get("hosts", {})
+    default_block = hosts.get(HOST, {})
+    has_key = bool(cfg.get("apiKey") or os.environ.get("HONCHO_API_KEY"))
+
+    if not default_block and not has_key:
+        print("  Honcho not configured on default profile. Run 'hermes honcho setup' first.\n")
+        return
+
+    created = 0
+    skipped = 0
+    for p in profiles:
+        if p.name == "default":
+            continue
+        if clone_honcho_for_profile(p.name):
+            print(f"  + {p.name} -> hermes.{p.name}")
+            created += 1
+        else:
+            skipped += 1
+
+    if created:
+        print(f"\n  {created} profile(s) synced.")
+    else:
+        print("  All profiles already have Honcho config.")
+    if skipped:
+        print(f"  {skipped} profile(s) already configured (skipped).")
+    print()
+
+
+def cmd_sync(args) -> None:
+    """Sync Honcho config to all existing profiles.
+
+    Scans all Hermes profiles and creates host blocks for any that don't
+    have one yet. Inherits settings from the default host block.
+    Also called automatically during `hermes update`.
+    """
+    try:
+        from hermes_cli.profiles import list_profiles
+        profiles = list_profiles()
+    except Exception as e:
+        print(f"  Could not list profiles: {e}\n")
+        return
+
+    cfg = _read_config()
+    if not cfg:
+        return
+
+    default_block = cfg.get("hosts", {}).get(HOST, {})
+    has_key = bool(cfg.get("apiKey") or os.environ.get("HONCHO_API_KEY"))
+
+    if not default_block and not has_key:
+        return
+
+    created = 0
+    for p in profiles:
+        if p.name == "default":
+            continue
+        if clone_honcho_for_profile(p.name):
+            print(f"  Honcho: + {p.name} -> hermes.{p.name}")
+            created += 1
+
+    if created:
+        print(f"  Honcho: {created} profile(s) synced.")
+
+
+def sync_honcho_profiles_quiet() -> int:
+    """Sync Honcho host blocks for all profiles. Returns count of newly created blocks.
+
+    Called from `hermes update` -- no output, no exceptions.
+    """
+    try:
+        from hermes_cli.profiles import list_profiles
+        profiles = list_profiles()
+    except Exception:
+        return 0
+
+    cfg = _read_config()
+    if not cfg:
+        return 0
+
+    default_block = cfg.get("hosts", {}).get(HOST, {})
+    has_key = bool(cfg.get("apiKey") or os.environ.get("HONCHO_API_KEY"))
+    if not default_block and not has_key:
+        return 0
+
+    created = 0
+    for p in profiles:
+        if p.name == "default":
+            continue
+        if clone_honcho_for_profile(p.name):
+            created += 1
+    return created
+
+
 _profile_override: str | None = None
 
 
@@ -1076,6 +1187,8 @@ def honcho_command(args) -> None:
         cmd_enable(args)
     elif sub == "disable":
         cmd_disable(args)
+    elif sub == "sync":
+        cmd_sync(args)
     else:
         print(f"  Unknown honcho command: {sub}")
-        print("  Available: setup, status, sessions, map, peer, mode, tokens, identity, migrate, enable, disable\n")
+        print("  Available: setup, status, sessions, map, peer, mode, tokens, identity, migrate, enable, disable, sync\n")