diff --git a/specification/Simplex/Messaging/Protocol.idr b/specification/Simplex/Messaging/Protocol.idr
index f8d4af923b..cdf82d11b8 100644
--- a/specification/Simplex/Messaging/Protocol.idr
+++ b/specification/Simplex/Messaging/Protocol.idr
@@ -274,10 +274,24 @@ data Command : (ty : Type)
 
   PushMsg     : {auto prf : HasState Sender s}
              -> Command () Broker Recipient
+                  (Secured <==> (Secured, n) <==| s)
+                  (>>> Secured <==> (Secured, n) <==| s)
+
+  DeleteMsg   : {auto prf : HasState Sender s}
+             -> Command () Recipient Broker
                   (Secured <==> (Secured, 1 + n) <==| s)
                   (>>> Secured <==> (Secured, n) <==| s)
 
+
   Pure  : (res : Result a) -> Command a from to state state_fn
   (>>=) : Command a from1 to1 state1 state2_fn
           -> ((res : Result a) -> Command b from2 to2 (state2_fn state1 res) state3_fn)
           -> Command b from1 to2 state1 state3_fn
+
+
+infix 5 &>
+(&>) : (p : Participant)
+    -> Command a from1 to1 state1 state2_fn
+    -> {auto prf : p = from1}
+    -> Command a from1 to1 state1 state2_fn
+(&>) _ c = c
diff --git a/specification/Simplex/Messaging/Scenarios.idr b/specification/Simplex/Messaging/Scenarios.idr
index a8da8644bf..83e45482d9 100644
--- a/specification/Simplex/Messaging/Scenarios.idr
+++ b/specification/Simplex/Messaging/Scenarios.idr
@@ -2,17 +2,18 @@ module Simplex.Messaging.Scenarios
 
 import Protocol
 
-establishConnection : Command () Recipient Recipient
+establishConnection : Command () Recipient Broker
                         (Null <==> (Null, 0) <==| Null)
                         (>>> Secured <==> (Secured, 0) <==| Secured)
 establishConnection = do
-  ids <- CreateConn "recipient's public key for broker"
-  Subscribe
-  SendInvite newInvitation
-  ConfirmConn "sender's public key for broker"
-  PushConfirm
-  SecureConn "sender's public key for broker"
-  SendWelcome
-  PushWelcome
-  SendMsg "Hello"
-  PushMsg
+  Recipient &> CreateConn "recipient's public key for broker"
+  Recipient &> Subscribe
+  Recipient &> SendInvite newInvitation
+  Sender    &> ConfirmConn "sender's public key for broker"
+  Broker    &> PushConfirm
+  Recipient &> SecureConn "sender's public key for broker"
+  Sender    &> SendWelcome
+  Broker    &> PushWelcome
+  Sender    &> SendMsg "Hello"
+  Broker    &> PushMsg
+  Recipient &> DeleteMsg