diff --git a/src/Simplex/Messaging/Agent.hs b/src/Simplex/Messaging/Agent.hs
index 7cff667d5..81b1f161a 100644
--- a/src/Simplex/Messaging/Agent.hs
+++ b/src/Simplex/Messaging/Agent.hs
@@ -636,6 +636,10 @@ runSmpQueueMsgDelivery c@AgentClient {subQ} cData@ConnData {connId, duplexHandsh
                         _ -> connError msgId NOT_ACCEPTED
                   AM_REPLY_ -> notifyDel msgId $ ERR e
                   AM_A_MSG_ -> notifyDel msgId $ MERR mId e
+                  AM_A_ADD_ -> pure ()
+                  AM_A_KEY_ -> pure ()
+                  AM_A_USE_ -> pure ()
+                  AM_A_DEL_ -> pure ()
                 _
                   -- for other operations BROKER HOST is treated as a permanent error (e.g., when connecting to the server),
                   -- the message sending would be retried
@@ -1024,6 +1028,10 @@ processSMPTransmission c@AgentClient {smpClients, subQ} (srv, v, sessId, rId, cm
                       A_MSG body -> do
                         logServer "<--" c srv rId "MSG <MSG>"
                         notify $ MSG msgMeta msgFlags body
+                      A_ADD _ -> pure ()
+                      A_KEY _ _ -> pure ()
+                      A_USE _ _ -> pure ()
+                      A_DEL _ _ -> pure ()
                     Right _ -> prohibited >> ack
                     Left e@(AGENT A_DUPLICATE) -> do
                       withStore' c (\db -> getLastMsg db connId srvMsgId) >>= \case
diff --git a/src/Simplex/Messaging/Agent/Protocol.hs b/src/Simplex/Messaging/Agent/Protocol.hs
index c3454db3e..5086971c0 100644
--- a/src/Simplex/Messaging/Agent/Protocol.hs
+++ b/src/Simplex/Messaging/Agent/Protocol.hs
@@ -427,7 +427,16 @@ instance Encoding AgentMessage where
       'M' -> AgentMessage <$> smpP <*> smpP
       _ -> fail "bad AgentMessage"
 
-data AgentMessageType = AM_CONN_INFO | AM_CONN_INFO_REPLY | AM_HELLO_ | AM_REPLY_ | AM_A_MSG_
+data AgentMessageType
+  = AM_CONN_INFO
+  | AM_CONN_INFO_REPLY
+  | AM_HELLO_
+  | AM_REPLY_
+  | AM_A_MSG_
+  | AM_A_ADD_
+  | AM_A_KEY_
+  | AM_A_USE_
+  | AM_A_DEL_
   deriving (Eq, Show)
 
 instance Encoding AgentMessageType where
@@ -437,6 +446,10 @@ instance Encoding AgentMessageType where
     AM_HELLO_ -> "H"
     AM_REPLY_ -> "R"
     AM_A_MSG_ -> "M"
+    AM_A_ADD_ -> "A"
+    AM_A_KEY_ -> "K"
+    AM_A_USE_ -> "U"
+    AM_A_DEL_ -> "X"
   smpP =
     A.anyChar >>= \case
       'C' -> pure AM_CONN_INFO
@@ -444,6 +457,10 @@ instance Encoding AgentMessageType where
       'H' -> pure AM_HELLO_
       'R' -> pure AM_REPLY_
       'M' -> pure AM_A_MSG_
+      'A' -> pure AM_A_ADD_
+      'K' -> pure AM_A_KEY_
+      'U' -> pure AM_A_USE_
+      'X' -> pure AM_A_DEL_
       _ -> fail "bad AgentMessageType"
 
 agentMessageType :: AgentMessage -> AgentMessageType
@@ -459,6 +476,10 @@ agentMessageType = \case
     -- REPLY is only used in v1
     REPLY _ -> AM_REPLY_
     A_MSG _ -> AM_A_MSG_
+    A_ADD _ -> AM_A_ADD_
+    A_KEY {} -> AM_A_KEY_
+    A_USE {} -> AM_A_USE_
+    A_DEL {} -> AM_A_DEL_
 
 data APrivHeader = APrivHeader
   { -- | sequential ID assigned by the sending agent
@@ -473,7 +494,14 @@ instance Encoding APrivHeader where
     smpEncode (sndMsgId, prevMsgHash)
   smpP = APrivHeader <$> smpP <*> smpP
 
-data AMsgType = HELLO_ | REPLY_ | A_MSG_
+data AMsgType
+  = HELLO_
+  | REPLY_
+  | A_MSG_
+  | A_ADD_
+  | A_KEY_
+  | A_USE_
+  | A_DEL_
   deriving (Eq)
 
 instance Encoding AMsgType where
@@ -481,11 +509,19 @@ instance Encoding AMsgType where
     HELLO_ -> "H"
     REPLY_ -> "R"
     A_MSG_ -> "M"
+    A_ADD_ -> "A"
+    A_KEY_ -> "K"
+    A_USE_ -> "U"
+    A_DEL_ -> "X"
   smpP =
     smpP >>= \case
       'H' -> pure HELLO_
       'R' -> pure REPLY_
       'M' -> pure A_MSG_
+      'A' -> pure A_ADD_
+      'K' -> pure A_KEY_
+      'U' -> pure A_USE_
+      'X' -> pure A_DEL_
       _ -> fail "bad AMsgType"
 
 -- | Messages sent between SMP agents once SMP queue is secured.
@@ -498,6 +534,14 @@ data AMessage
     REPLY (L.NonEmpty SMPQueueInfo)
   | -- | agent envelope for the client message
     A_MSG MsgBody
+  | -- add queue to connection
+    A_ADD SMPQueueInfo
+  | -- key to secure the added queue and agree e2e encryption key
+    A_KEY SMPQueueInfo SndPublicVerifyKey
+  | -- inform that the queue is ready to use
+    A_USE SMPServer SMP.SenderId
+  | -- inform that the queue will be deleted
+    A_DEL SMPServer SMP.SenderId
   deriving (Show)
 
 instance Encoding AMessage where
@@ -505,12 +549,20 @@ instance Encoding AMessage where
     HELLO -> smpEncode HELLO_
     REPLY smpQueues -> smpEncode (REPLY_, smpQueues)
     A_MSG body -> smpEncode (A_MSG_, Tail body)
+    A_ADD qInfo -> smpEncode (A_ADD_, qInfo)
+    A_KEY qInfo sKey -> smpEncode (A_KEY_, qInfo, sKey)
+    A_USE srv sndId -> smpEncode (A_USE_, srv, sndId)
+    A_DEL srv sndId -> smpEncode (A_DEL_, srv, sndId)
   smpP =
     smpP
       >>= \case
         HELLO_ -> pure HELLO
         REPLY_ -> REPLY <$> smpP
         A_MSG_ -> A_MSG . unTail <$> smpP
+        A_ADD_ -> A_ADD <$> smpP
+        A_KEY_ -> A_KEY <$> smpP <*> smpP
+        A_USE_ -> A_USE <$> smpP <*> smpP
+        A_DEL_ -> A_DEL <$> smpP <*> smpP
 
 instance forall m. ConnectionModeI m => StrEncoding (ConnectionRequestUri m) where
   strEncode = \case