diff --git a/libs/wire-api/src/Wire/API/ErrorDescription.hs b/libs/wire-api/src/Wire/API/ErrorDescription.hs
index 888b5289a39..ba54332ca98 100644
--- a/libs/wire-api/src/Wire/API/ErrorDescription.hs
+++ b/libs/wire-api/src/Wire/API/ErrorDescription.hs
@@ -370,3 +370,5 @@ type BroadcastLimitExceeded =
     400
     "too-many-users-to-broadcast"
     "Too many users to fan out the broadcast event to."
+
+type InvalidAction = ErrorDescription 403 "invalid-actions" "The specified actions are invalid."
diff --git a/libs/wire-api/src/Wire/API/Routes/Public/Galley.hs b/libs/wire-api/src/Wire/API/Routes/Public/Galley.hs
index 74b1f33d9c7..8ee2ed41f03 100644
--- a/libs/wire-api/src/Wire/API/Routes/Public/Galley.hs
+++ b/libs/wire-api/src/Wire/API/Routes/Public/Galley.hs
@@ -294,6 +294,15 @@ type ConversationAPI =
     :<|> Named
            "add-members-to-conversation"
            ( Summary "Add qualified members to an existing conversation."
+               :> CanThrow ConvNotFound
+               :> CanThrow ActionDenied
+               :> CanThrow (InvalidOp "Invalid operation")
+               :> CanThrow InvalidAction
+               :> CanThrow TooManyMembers
+               :> CanThrow ConvAccessDenied
+               :> CanThrow NotATeamMember
+               :> CanThrow NotConnected
+               :> CanThrow MissingLegalholdConsent
                :> ZLocalUser
                :> ZConn
                :> "conversations"