diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5c1678a..44e59d3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,6 +21,7 @@ add_executable(${EXEC_NAME} main.cpp jay.cpp)
 add_subdirectory(component)
 add_subdirectory(connection)
 add_subdirectory(module)
+add_subdirectory(shared)
 
 target_include_directories(${EXEC_NAME} PRIVATE ${GLOOX_INCLUDE_DIRS})
 target_include_directories(${EXEC_NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
diff --git a/component/config.cpp b/component/config.cpp
index a729912..d3838e5 100644
--- a/component/config.cpp
+++ b/component/config.cpp
@@ -85,7 +85,7 @@ Config::Module Config::getModuleConfig(const std::string& name) const {
     YAML::Node prm = conf["permissions"];
     if (prm.IsMap()) {
         for (const auto& node : prm) {
-            Module::List& list = result.permissions.emplace(node.first.as<std::string>(), Module::List()).first->second;
+            Shared::Strings& list = result.permissions.emplace(node.first.as<std::string>(), Shared::Strings()).first->second;
             YAML::Node lst = node.second;
             if (lst.IsSequence())
                 for (const YAML::Node& member : lst)
@@ -93,6 +93,25 @@ Config::Module Config::getModuleConfig(const std::string& name) const {
         }
     }
 
-
     return result;
 }
+
+Shared::Responses Config::getResponses() const {
+    Shared::Responses responses;
+
+    YAML::Node replies = root["replies"];
+    if (!replies || !replies.IsMap())
+        return responses;
+
+    for (const std::pair<Shared::Result, std::string_view>& entry : Shared::results) {
+        YAML::Node options = replies[entry.second];
+        if (!options.IsSequence())
+            continue;
+
+        Shared::Strings& out = responses.emplace(entry.first, Shared::Strings()).first->second;
+        for (const YAML::Node& option : options)
+            out.emplace_back(option.as<std::string>());
+    }
+
+    return responses;
+}
diff --git a/component/config.h b/component/config.h
index 0aae50d..9169159 100644
--- a/component/config.h
+++ b/component/config.h
@@ -10,17 +10,16 @@
 
 #include "yaml-cpp/yaml.h"
 
+#include "shared/definitions.h"
+#include "shared/result.h"
 #include "logger.h"
 
 class Config {
 public:
     struct Module {
-        typedef std::vector<std::string> List;
-        typedef std::map<std::string, List> Permissions;
-
         bool enabled;
         std::string alias;
-        Permissions permissions;
+        Shared::Permissions permissions;
     };
 
 public:
@@ -36,6 +35,7 @@ public:
     Logger::Level getLogLevel() const;
     gloox::TLSPolicy getTLSPolicy() const;
     Module getModuleConfig(const std::string& name) const;
+    Shared::Responses getResponses() const;
 
 private:
     YAML::Node root;
diff --git a/component/core.cpp b/component/core.cpp
index 0b40d79..ad89f2d 100644
--- a/component/core.cpp
+++ b/component/core.cpp
@@ -3,8 +3,51 @@
 
 #include "core.h"
 
+#include "connection/connection.h"
+
 Core::Core(const std::string& configPath):
     config(configPath),
-    router(),
-    logger(config.getLogLevel())
+    logger(config.getLogLevel()),
+    router(logger),
+    initialized(false)
 {}
+
+void Core::send(const std::string& jid, const std::string& body) {
+    std::shared_ptr<Connection> cn = connection.lock();
+    if (!cn) {
+        logger.log(Logger::warning, "Couldn't send a message to " + jid + ", connection is not available", {"Core"});
+        return;
+    }
+
+    cn->send(jid, body);
+}
+
+void Core::initialize(const std::shared_ptr<Connection>& cn) {
+    connection = cn;
+    router.setConnection(cn);
+
+    if (initialized)
+        return;
+
+    initializeActors();
+    initializeResponses();
+
+    initialized = true;
+}
+
+void Core::setGroup(const std::string& jid, const std::string& group) {
+    router.registerActor(jid, group);
+    // todo save config
+}
+
+void Core::initializeActors() {
+    for (const std::pair<const std::string, std::string>& pair : config.getActors()) {
+        logger.log(Logger::info, "registering actor " + pair.first + " as " + pair.second, {"Core"});
+        router.registerActor(pair.first, pair.second);
+    }
+}
+
+void Core::initializeResponses() {
+    for (const std::pair<Shared::Result, Shared::Strings>& pair : config.getResponses())
+        router.setResponses(pair.first, pair.second);
+}
diff --git a/component/core.h b/component/core.h
index f8c08f5..6a63a66 100644
--- a/component/core.h
+++ b/component/core.h
@@ -4,17 +4,33 @@
 #pragma once
 
 #include <string>
+#include <memory>
 
 #include "config.h"
 #include "router.h"
 #include "logger.h"
 
+class Connection;
+
 class Core {
 public:
     Core(const std::string& configPath);
 
+    void send(const std::string& jid, const std::string& body);
+    void initialize(const std::shared_ptr<Connection>& connection);
+    void setGroup(const std::string& jid, const std::string& group);
+
+public:
     Config config;
-    Router router;
     Logger logger;
+    Router router;
+
+private:
+    void initializeActors();
+    void initializeResponses();
+
+private:
+    bool initialized;
+    std::weak_ptr<Connection> connection;
 
 };
diff --git a/component/logger.cpp b/component/logger.cpp
index 8ab3548..0e7f10b 100644
--- a/component/logger.cpp
+++ b/component/logger.cpp
@@ -129,7 +129,7 @@ void Logger::handleLog(gloox::LogLevel level, gloox::LogArea area, const std::st
     std::cout << clear << '\t' << message << clear << std::endl;
 }
 
-void Logger::log(Level lvl, const std::string& message, const std::vector<std::string>& domain) {
+void Logger::log(Level lvl, const std::string& message, const std::vector<std::string>& domain) const {
     if (lvl < level)
         return;
 
diff --git a/component/logger.h b/component/logger.h
index d14b473..6059745 100644
--- a/component/logger.h
+++ b/component/logger.h
@@ -25,7 +25,7 @@ public:
 
     void handleLog(gloox::LogLevel level, gloox::LogArea area, const std::string& message) override;
 
-    void log(Level level, const std::string& message, const std::vector<std::string>& domain = {});
+    void log(Level level, const std::string& message, const std::vector<std::string>& domain = {}) const;
 
     static gloox::LogLevel convert(Level level);
     static Level convert(gloox::LogLevel level);
diff --git a/component/router.cpp b/component/router.cpp
index 8789e84..b6314a9 100644
--- a/component/router.cpp
+++ b/component/router.cpp
@@ -4,10 +4,19 @@
 #include "router.h"
 
 #include "module/module.h"
+#include "connection/connection.h"
 
-Router::Router():
+Router::Router(const Logger& logger):
+    logger(logger),
+    modules(),
     actors(),
-    defaultGroup("Stranger")
+    defaultGroup("Stranger"),
+    responses({
+        {Shared::forbidden, { "Forbidden" }},
+        {Shared::error, { "Command error" }},
+        {Shared::unhandled, { "No such command" }},
+    }),
+    generator(std::random_device{}())
 {}
 
 void Router::registerModule(const std::string& key, const std::shared_ptr<Module::Module>& module) {
@@ -34,15 +43,29 @@ void Router::routeMessage(const std::string& sender, const std::string& body) {
 
     std::vector<std::string> args = Module::Module::split(body);
     Modules::iterator mItr = modules.find(args[0]);
-    if (mItr == modules.end())
-        return;
+    if (mItr == modules.end()) {
+        logger.log(Logger::debug, "could not find module \"" + args[0] + "\" to handle message from " + sender, {"Router"});
+        return onMessageResult(Shared::unhandled, sender);
+    }
 
     std::shared_ptr<Module::Module> module = mItr->second.lock();
-    if (!module)
-        return;
+    if (!module) {
+        logger.log(Logger::error, "could not lock module \"" + mItr->first + "\" to handle message from " + sender, {"Router"});
+        return onMessageResult(Shared::error, sender);
+    }
 
     args.erase(args.begin());
-    module->message(aItr->second, args);
+    Shared::Result result;
+    try {
+        result = module->message(aItr->second, args);
+        if (result == Shared::success)
+        logger.log(Logger::debug, "module \"" + mItr->first + "\" successfully handled message from " + sender, {"Router"});
+    } catch (...) {
+        logger.log(Logger::error, "module \"" + mItr->first + "\" thew an unhandled exception handling message from " + sender, {"Router"});
+        result = Shared::error;
+    }
+
+    onMessageResult(result, sender);
 }
 
 std::map<std::string, std::string> Router::getActors() const {
@@ -54,4 +77,35 @@ std::map<std::string, std::string> Router::getActors() const {
     return result;
 }
 
+void Router::setConnection(const std::shared_ptr<Connection>& cn) {
+    connection = cn;
+}
+
+void Router::setResponses(Shared::Result result, const Shared::Strings& options) {
+    responses[result] = options;
+}
+
+std::string Router::getGroup(const std::string& key) const {
+    Actors::const_iterator itr = actors.find(key);
+    if (itr == actors.end())
+        return defaultGroup;
+
+    return itr->second->getGroup();
+}
+
+void Router::onMessageResult(Shared::Result result, const std::string& sender) {
+    Responses::const_iterator rItr = responses.find(result);
+    if (rItr == responses.end() || rItr->second.empty())
+        return;
+    
+    std::shared_ptr<Connection> cn = connection.lock();
+    if (!cn) {
+        logger.log(Logger::warning, "Couldn't send a message to " + sender + ", connection is not available", {"Router"});
+        return;
+    }
+
+    const List& options = rItr->second;
+    std::uniform_int_distribution<std::size_t> dist(0, options.size() - 1);
+    cn->send(sender, options[dist(generator)]);
+}
 
diff --git a/component/router.h b/component/router.h
index 3655551..4d9caeb 100644
--- a/component/router.h
+++ b/component/router.h
@@ -7,16 +7,21 @@
 #include <map>
 #include <vector>
 #include <memory>
+#include <random>
 
+#include "shared/result.h"
 #include "actor.h"
+#include "logger.h"
 
 namespace Module {
     class Module;
 };
 
+class Connection;
+
 class Router {
 public:
-    Router();
+    Router(const Logger& logger);
 
     void registerModule(const std::string& key, const std::shared_ptr<Module::Module>& module);
     void registerActor(const std::string& key, const std::string& group);
@@ -24,11 +29,24 @@ public:
 
     std::map<std::string, std::string> getActors() const;
 
+    void setConnection(const std::shared_ptr<Connection>& connection);
+    void setResponses(Shared::Result result, const Shared::Strings& options);
+    std::string getGroup(const std::string& key) const;
+
+private:
+    void onMessageResult(Shared::Result result, const std::string& sender);
+
 private:
     typedef std::map<std::string, std::weak_ptr<Module::Module>> Modules;
     typedef std::map<std::string, std::shared_ptr<Actor>> Actors;
+    typedef std::vector<std::string> List;
+    typedef std::map<Shared::Result, List> Responses;
 
+    std::weak_ptr<Connection> connection;
+    const Logger& logger;
     Modules modules;
     Actors actors;
     std::string defaultGroup;
+    Responses responses;
+    std::mt19937 generator;
 };
diff --git a/connection/connection.cpp b/connection/connection.cpp
index f704b22..ce78083 100644
--- a/connection/connection.cpp
+++ b/connection/connection.cpp
@@ -13,7 +13,7 @@ Connection::~Connection() noexcept {
     deinitialize();
 }
 
-void Connection::initiialize() {
+void Connection::initialize() {
     if (state != initial)
         return;
 
@@ -65,9 +65,16 @@ void Connection::send(const std::string& jid, const std::string& body) {
 }
 
 void Connection::handleMessage(const gloox::Message& message, gloox::MessageSession* session) {
+    if (message.subtype() != gloox::Message::Chat)
+        return;
+
+    std::string body = message.body();
+    if (body.empty())
+        return;
+
     std::string jid = message.from().bare();
-    core->logger.log(Logger::debug, "received message \"" + message.body() + "\" from " + jid, {"Connection"});
-    core->router.routeMessage(jid, message.body());
+    core->logger.log(Logger::debug, "received message \"" + body + "\" from " + jid, {"Connection"});
+    core->router.routeMessage(jid, body);
 }
 
 void Connection::onConnect() {
diff --git a/connection/connection.h b/connection/connection.h
index e933387..910635c 100644
--- a/connection/connection.h
+++ b/connection/connection.h
@@ -28,7 +28,7 @@ public:
     Connection(const std::shared_ptr<Core>& core);
     ~Connection() noexcept;
 
-    void initiialize();
+    void initialize();
     void deinitialize();
     void connect();
     void send(const std::string& jid, const std::string& body);
diff --git a/example.config.yml b/example.config.yml
index ffe7d50..f63d888 100644
--- a/example.config.yml
+++ b/example.config.yml
@@ -17,3 +17,9 @@ modules:
     permissions:
       read: [Owner, User]
       write: [Owner]
+
+replies:
+  success: []
+  forbidden: [Forbidden]
+  error: [Command error]
+  unhandled: [No such command]
diff --git a/jay.cpp b/jay.cpp
index b3edb99..ade530d 100644
--- a/jay.cpp
+++ b/jay.cpp
@@ -10,16 +10,14 @@ static const std::map<
     std::function<
         std::shared_ptr<Module::Module>(
             const std::shared_ptr<Core>&,
-            const std::shared_ptr<Connection>&,
-            const Module::Module::Permissions& permissions
+            const Shared::Permissions& permissions
         )
     >
 > moduleNames = {
     {"actor", [](
         const std::shared_ptr<Core>& core, 
-        const std::shared_ptr<Connection>& connection,
-        const Module::Module::Permissions& permissions
-    ) { return std::make_shared<Module::Actor>(core, connection, permissions); }}
+        const Shared::Permissions& permissions
+    ) { return std::make_shared<Module::Actor>(core, permissions); }}
 };
 
 Jay::Jay(const std::string& configPath):
@@ -42,16 +40,9 @@ void Jay::run() {
 }
 
 void Jay::initialize() {
-    connection->initiialize();
     createModules();
-    createActors();
-}
-
-void Jay::createActors() {
-    for (const std::pair<const std::string, std::string>& pair : core->config.getActors()) {
-        core->logger.log(Logger::info, "registering actor " + pair.first + " as " + pair.second, {"Jay"});
-        core->router.registerActor(pair.first, pair.second);
-    }
+    core->initialize(connection);
+    connection->initialize();
 }
 
 void Jay::createModules() {
@@ -61,7 +52,7 @@ void Jay::createModules() {
             continue;
 
         core->logger.log(Logger::info, "enabling module " + pair.first, {"Jay"});
-        modules.emplace_back(pair.second(core, connection, conf.permissions));
+        modules.emplace_back(pair.second(core, conf.permissions));
         core->router.registerModule(pair.first, modules.back());
     }
 }
diff --git a/jay.h b/jay.h
index 603f0d4..0f3c694 100644
--- a/jay.h
+++ b/jay.h
@@ -13,6 +13,7 @@
 #include <gloox/disco.h>
 #include <gloox/connectionlistener.h>
 
+#include "shared/definitions.h"
 #include "component/core.h"
 #include "connection/connection.h"
 #include "module/module.h"
@@ -28,7 +29,6 @@ public:
 
 private:
     void initialize();
-    void createActors();
     void createModules();
 
 private:
diff --git a/module/actor.cpp b/module/actor.cpp
index 44d5848..ee68076 100644
--- a/module/actor.cpp
+++ b/module/actor.cpp
@@ -3,20 +3,36 @@
 
 #include "actor.h"
 
-Module::Actor::Actor(const std::shared_ptr<Core>& core, const std::shared_ptr<Connection>& connection, const Permissions& permissions):
-    Module(core, connection, permissions)
+Module::Actor::Actor(const std::shared_ptr<Core>& core, const Shared::Permissions& permissions):
+    Module(core, permissions)
 {}
 
 Module::Actor::~Actor() noexcept {}
 
-void Module::Actor::message(const std::shared_ptr<::Actor>& actor, const Module::Module::Tokens& args) {
+Shared::Result Module::Actor::message(const std::shared_ptr<::Actor>& actor, const Shared::Strings& args) {
     std::string result;
 
-    if (args.front() == "list")
-        result = hasPermission("read", actor) ? list() : "Can not tell you that";
+    if (args.front() == "list") {
+        if (!hasPermission("read", actor))
+            return Shared::forbidden;
+            
+        result = list();
+    } else if (args.front() == "set") {
+        if (!hasPermission("write", actor))
+            return Shared::forbidden;
+        
+        if (args.size() < 3)
+            return Shared::error;
 
-    if (!result.empty())
-        connection->send(actor->jid, result);
+        result = set(args[1], args[2]);
+    }
+
+    if (!result.empty()) {
+        core->send(actor->jid, result);
+        return Shared::success;
+    }
+
+    return Shared::unhandled;
 }
 
 std::string Module::Actor::list() {
@@ -33,3 +49,9 @@ std::string Module::Actor::list() {
 
     return result;
 }
+
+std::string Module::Actor::set(const std::string& jid, const std::string& group) {
+    core->setGroup(jid, group);
+
+    return jid + " is now " + core->router.getGroup(jid);
+}
diff --git a/module/actor.h b/module/actor.h
index ef89150..fc6448b 100644
--- a/module/actor.h
+++ b/module/actor.h
@@ -3,19 +3,22 @@
 
 #pragma once
 
+#include "shared/definitions.h"
+#include "shared/result.h"
 #include "module.h"
 
 namespace Module {
 
 class Actor : public Module {
 public:
-    Actor(const std::shared_ptr<Core>& core, const std::shared_ptr<Connection>& connection, const Permissions& permissions);
+    Actor(const std::shared_ptr<Core>& core, const Shared::Permissions& permissions);
     ~Actor() noexcept;
 
-    virtual void message(const std::shared_ptr<::Actor>& actor, const Tokens& args) override;
+    virtual Shared::Result message(const std::shared_ptr<::Actor>& actor, const Shared::Strings& args) override;
 
 private:
     std::string list();
+    std::string set(const std::string& jid, const std::string& group);
 };
 
 }
diff --git a/module/module.cpp b/module/module.cpp
index 56815ff..3865188 100644
--- a/module/module.cpp
+++ b/module/module.cpp
@@ -7,14 +7,13 @@
 
 #include "gloox/message.h"
 
-Module::Module::Module(const std::shared_ptr<Core>& core, const std::shared_ptr<Connection>& connection, const Permissions& permissions):
+Module::Module::Module(const std::shared_ptr<Core>& core, const Shared::Permissions& permissions):
     core(core),
-    connection(connection),
     permissions(permissions)
 {}
 
 bool Module::Module::hasPermission(const std::string& permission, const std::shared_ptr<::Actor>& actor) const {
-    Permissions::const_iterator itr = permissions.find(permission);
+    Shared::Permissions::const_iterator itr = permissions.find(permission);
     if (itr == permissions.end())
         return false;
 
diff --git a/module/module.h b/module/module.h
index 61a7911..b8f2513 100644
--- a/module/module.h
+++ b/module/module.h
@@ -7,34 +7,29 @@
 #include <memory>
 #include <vector>
 
+#include "shared/definitions.h"
+#include "shared/result.h"
 #include "component/core.h"
 #include "component/actor.h"
-#include "connection/connection.h"
 
 namespace Module {
 
 class Module {
-public:
-    typedef std::vector<std::string> Tokens;
-    typedef std::vector<std::string> List;
-    typedef std::map<std::string, List> Permissions;
-
 protected:
-    Module(const std::shared_ptr<Core>& core, const std::shared_ptr<Connection>& connection, const Permissions& permissions);
+    Module(const std::shared_ptr<Core>& core, const Shared::Permissions& permissions);
 
     bool hasPermission(const std::string& permission, const std::shared_ptr<::Actor>& actor) const;
 
 public:
     virtual ~Module() noexcept;
 
-    static Tokens split(const std::string& string, const std::string& delimiter = " ");
+    static Shared::Strings split(const std::string& string, const std::string& delimiter = " ");
 
-    virtual void message(const std::shared_ptr<::Actor>& actor, const Tokens& args) = 0;
+    virtual Shared::Result message(const std::shared_ptr<::Actor>& actor, const Shared::Strings& args) = 0;
 
 protected:
     std::shared_ptr<Core> core;
-    std::shared_ptr<Connection> connection;
-    Permissions permissions;
+    Shared::Permissions permissions;
 
 };
 
diff --git a/shared/CMakeLists.txt b/shared/CMakeLists.txt
new file mode 100644
index 0000000..d157eb4
--- /dev/null
+++ b/shared/CMakeLists.txt
@@ -0,0 +1,9 @@
+set(SOURCES
+)
+
+set(HEADERS
+    definitions.h
+    result.h
+)
+
+target_sources(${EXEC_NAME} PRIVATE ${SOURCES})
\ No newline at end of file
diff --git a/shared/definitions.h b/shared/definitions.h
new file mode 100644
index 0000000..c03236e
--- /dev/null
+++ b/shared/definitions.h
@@ -0,0 +1,13 @@
+// SPDX-FileCopyrightText: 2024 Yury Gubich <blue@macaw.me>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <string>
+#include <vector>
+#include <map>
+
+namespace Shared {
+    typedef std::vector<std::string> Strings;
+    typedef std::map<std::string, Strings> Permissions;
+}
\ No newline at end of file
diff --git a/shared/result.h b/shared/result.h
new file mode 100644
index 0000000..60e9c36
--- /dev/null
+++ b/shared/result.h
@@ -0,0 +1,30 @@
+// SPDX-FileCopyrightText: 2024 Yury Gubich <blue@macaw.me>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <map>
+#include <array>
+#include <string_view>
+
+#include "definitions.h"
+
+namespace Shared {
+    enum Result {
+        success,
+        forbidden,
+        unhandled,
+        error
+    };
+
+    typedef std::map<Result, Strings> Responses;
+
+    constexpr std::array<std::pair<Result, std::string_view>, 4> results = {{
+        { success, "success" },
+        { forbidden, "forbidden" },
+        { unhandled, "unhandled" },
+        { error, "error" },
+    }};
+
+
+}
\ No newline at end of file