diff --git a/README.md b/README.md
index cb60a89..8ef19fb 100644
--- a/README.md
+++ b/README.md
@@ -56,18 +56,21 @@ services that Sagittarius must implement as a server.
 .
 ├── aquila
 │   ├── action - Action service (emits events, and handles executions)
+│   ├── execution - Service for updating completed executions
+│   ├── install_action - Service for listing, installing, and uninstalling actions
 │   ├── module - Module service for Taurus to send over datatypes, functions and flow types
 │   ├── runtime_status - Service for runtime status (handles information about Draco and Taurus)
-│   ├── runtime_usage - Service for runtime usage (handles execution time of a flow)
-│   └── execution - Service for updating completed executions
+│   └── runtime_usage - Service for runtime usage (handles execution time of a flow)
 ├── sagittarius
 │   ├── flow - Flow service (handles flow updates)
+│   ├── install_action - Service for listing, installing, and uninstalling actions
 │   ├── module - Module service to receive datatypes, functions and flow types from aquila
 │   ├── ping - Ping service (performs life checks)
 │   ├── runtime_status - Service for runtime status (handles information about Draco and Taurus)
 │   ├── runtime_usage - Service for runtime usage (handles execution time of a flow)
 │   └── test_execution - Service and Types for the test execution
 └── shared
+    ├── action - Defines information about an installable action
     ├── data_type - Defines types for data types
     ├── errors - Defines error object
     ├── execution_result - Defines execution result of a flow
@@ -82,3 +85,4 @@ services that Sagittarius must implement as a server.
     ├── struct - Defines json representations
     └── translation - Contains translations with country codes and translated messages
 ```
+
diff --git a/proto/aquila/aquila.install_action.proto b/proto/aquila/aquila.install_action.proto
new file mode 100644
index 0000000..7d5f174
--- /dev/null
+++ b/proto/aquila/aquila.install_action.proto
@@ -0,0 +1,65 @@
+syntax = "proto3";
+
+option ruby_package = "Tucana::Aquila";
+
+package aquila;
+
+import "shared.action.proto";
+
+message UninstallActionCommand {
+  string action_identifier = 1;
+}
+
+message InstallActionCommand {
+  string action_identifier = 1;
+}
+
+message UninstallActionResult {
+  enum Result {
+    UNKNOWN = 0;
+    UNINSTALLED = 1;
+    FAILED = 2;
+  }
+
+  Result result = 1;
+}
+
+message InstallActionResult {
+  enum Result {
+    UNKNOWN = 0;
+    ALREADY_INSTALLED = 1;
+    INSTALLED = 2;
+    FAILED = 3;
+  }
+
+  Result result = 1;
+}
+
+message ListInstallableActionsCommand {}
+
+message ListInstallableActionsResult {
+  repeated shared.InstallableAction actions = 1;
+}
+
+message Logon {}
+
+message ActionInstallServiceRequest {
+  oneof data {
+    Logon logon = 1;
+    ListInstallableActionsResult list_installable_actions_result = 2;
+    InstallActionResult install_action_result = 3;
+    UninstallActionResult uninstall_action_result = 4;
+  }
+}
+
+message ActionInstallServiceResponse {
+  oneof data {
+    InstallActionCommand install_action = 1;
+    UninstallActionCommand uninstall_action = 2;
+    ListInstallableActionsCommand list_installable_actions = 3;
+  }
+}
+
+service ActionInstallService {
+  rpc Install (stream ActionInstallServiceRequest) returns (stream ActionInstallServiceResponse);
+}
diff --git a/proto/sagittarius/sagittarius.install_action.proto b/proto/sagittarius/sagittarius.install_action.proto
new file mode 100644
index 0000000..cae42c1
--- /dev/null
+++ b/proto/sagittarius/sagittarius.install_action.proto
@@ -0,0 +1,68 @@
+syntax = "proto3";
+
+option ruby_package = "Tucana::Sagittarius";
+
+package sagittarius;
+
+import "shared.action.proto";
+
+message UninstallActionCommand {
+  string action_identifier = 1;
+}
+
+message InstallActionCommand {
+  string action_identifier = 1;
+}
+
+message UninstallActionResult {
+  enum Result {
+    UNKNOWN = 0;
+    UNINSTALLED = 1;
+    FAILED = 2;
+  }
+
+  Result result = 1;
+}
+
+message InstallActionResult {
+  enum Result {
+    UNKNOWN = 0;
+    ALREADY_INSTALLED = 1;
+    INSTALLED = 2;
+    FAILED = 3;
+  }
+
+  Result result = 1;
+}
+
+message ListInstallableActionsCommand {}
+
+message ListInstallableActionsResult {
+  repeated shared.InstallableAction actions = 1;
+}
+
+message ActionInstallLogon {
+  // does this runtime has the capability to install Actions
+  bool can_install_actions = 1;
+}
+
+message ActionInstallServiceRequest {
+  oneof data {
+    ActionInstallLogon logon = 1;
+    ListInstallableActionsResult list_installable_actions_result = 2;
+    InstallActionResult install_action_result = 3;
+    UninstallActionResult uninstall_action_result = 4;
+  }
+}
+
+message ActionInstallServiceResponse {
+  oneof data {
+    InstallActionCommand install_action = 1;
+    UninstallActionCommand uninstall_action = 2;
+    ListInstallableActionsCommand list_installable_actions = 3;
+  }
+}
+
+service ActionInstallService {
+  rpc Install (stream ActionInstallServiceRequest) returns (stream ActionInstallServiceResponse);
+}
diff --git a/proto/shared/shared.action.proto b/proto/shared/shared.action.proto
new file mode 100644
index 0000000..bf32df3
--- /dev/null
+++ b/proto/shared/shared.action.proto
@@ -0,0 +1,14 @@
+syntax = "proto3";
+
+option ruby_package = "Tucana::Shared";
+
+package shared;
+
+import "shared.translation.proto";
+
+message InstallableAction {
+  string action_identifier = 1;
+  repeated shared.Translation name = 2;
+  repeated shared.Translation description = 3;
+  string display_icon = 4;
+}