diff --git a/game/shared/base_gcmessages.proto b/game/shared/base_gcmessages.proto
new file mode 100644
index 00000000..54522956
--- /dev/null
+++ b/game/shared/base_gcmessages.proto
@@ -0,0 +1,571 @@
+import "steammessages.proto";
+
+enum EGCBaseMsg {
+	k_EMsgGCSystemMessage = 4001;
+	k_EMsgGCReplicateConVars = 4002;
+	k_EMsgGCConVarUpdated = 4003;
+	k_EMsgGCInQueue = 4008;
+	k_EMsgGCInviteToParty = 4501;
+	k_EMsgGCInvitationCreated = 4502;
+	k_EMsgGCPartyInviteResponse = 4503;
+	k_EMsgGCKickFromParty = 4504;
+	k_EMsgGCLeaveParty = 4505;
+	k_EMsgGCServerAvailable = 4506;
+	k_EMsgGCClientConnectToServer = 4507;
+	k_EMsgGCGameServerInfo = 4508;
+	k_EMsgGCError = 4509;
+	k_EMsgGCReplay_UploadedToYouTube = 4510;
+	k_EMsgGCLANServerAvailable = 4511;
+}
+
+enum EGCBaseProtoObjectTypes {
+	k_EProtoObjectPartyInvite = 1001;
+	k_EProtoObjectLobbyInvite = 1002;
+}
+
+enum GC_BannedWordType {
+	GC_BANNED_WORD_DISABLE_WORD = 0;
+	GC_BANNED_WORD_ENABLE_WORD = 1;
+}
+
+message CGCStorePurchaseInit_LineItem {
+	optional uint32 item_def_id = 1;
+	optional uint32 quantity = 2;
+	optional uint32 cost_in_local_currency = 3;
+	optional uint32 purchase_type = 4;
+	optional uint64 supplemental_data = 5;
+}
+
+message CMsgGCStorePurchaseInit {
+	optional string country = 1;
+	optional int32 language = 2;
+	optional int32 currency = 3;
+	repeated .CGCStorePurchaseInit_LineItem line_items = 4;
+}
+
+message CMsgGCStorePurchaseInitResponse {
+	optional int32 result = 1;
+	optional uint64 txn_id = 2;
+	optional string url = 3;
+	repeated uint64 item_ids = 4;
+}
+
+message CSOPartyInvite {
+	optional uint64 group_id = 1 [(key_field) = true];
+	optional fixed64 sender_id = 2;
+	optional string sender_name = 3;
+}
+
+message CSOLobbyInvite {
+	optional uint64 group_id = 1 [(key_field) = true];
+	optional fixed64 sender_id = 2;
+	optional string sender_name = 3;
+}
+
+message CMsgSystemBroadcast {
+	optional string message = 1;
+}
+
+message CMsgInviteToParty {
+	optional fixed64 steam_id = 1;
+	optional uint32 client_version = 2;
+	optional uint32 team_invite = 3;
+}
+
+message CMsgInvitationCreated {
+	optional uint64 group_id = 1;
+	optional fixed64 steam_id = 2;
+}
+
+message CMsgPartyInviteResponse {
+	optional uint64 party_id = 1;
+	optional bool accept = 2;
+	optional uint32 client_version = 3;
+	optional uint32 team_invite = 4;
+}
+
+message CMsgKickFromParty {
+	optional fixed64 steam_id = 1;
+}
+
+message CMsgLeaveParty {
+}
+
+message CMsgServerAvailable {
+}
+
+message CMsgLANServerAvailable {
+	optional fixed64 lobby_id = 1;
+}
+
+message CSOEconGameAccountClient {
+	optional uint32 additional_backpack_slots = 1 [default = 0];
+	optional fixed32 bonus_xp_timestamp_refresh = 12;
+	optional uint32 bonus_xp_usedflags = 13;
+	optional uint32 elevated_state = 14;
+	optional uint32 elevated_timestamp = 15;
+}
+
+message CSOItemCriteriaCondition {
+	optional int32 op = 1;
+	optional string field = 2;
+	optional bool required = 3;
+	optional float float_value = 4;
+	optional string string_value = 5;
+}
+
+message CSOItemCriteria {
+	optional uint32 item_level = 1;
+	optional int32 item_quality = 2;
+	optional bool item_level_set = 3;
+	optional bool item_quality_set = 4;
+	optional uint32 initial_inventory = 5;
+	optional uint32 initial_quantity = 6;
+	optional bool ignore_enabled_flag = 8;
+	repeated .CSOItemCriteriaCondition conditions = 9;
+	optional int32 item_rarity = 10;
+	optional bool item_rarity_set = 11;
+	optional bool recent_only = 12;
+}
+
+message CSOItemRecipe {
+	optional uint32 def_index = 1;
+	optional string name = 2;
+	optional string n_a = 3;
+	optional string desc_inputs = 4;
+	optional string desc_outputs = 5;
+	optional string di_a = 6;
+	optional string di_b = 7;
+	optional string di_c = 8;
+	optional string do_a = 9;
+	optional string do_b = 10;
+	optional string do_c = 11;
+	optional bool requires_all_same_class = 12;
+	optional bool requires_all_same_slot = 13;
+	optional int32 class_usage_for_output = 14;
+	optional int32 slot_usage_for_output = 15;
+	optional int32 set_for_output = 16;
+	repeated .CSOItemCriteria input_items_criteria = 20;
+	repeated .CSOItemCriteria output_items_criteria = 21;
+	repeated uint32 input_item_dupe_counts = 22;
+}
+
+message CMsgDevNewItemRequest {
+	optional fixed64 receiver = 1;
+	optional .CSOItemCriteria criteria = 2;
+}
+
+message CMsgIncrementKillCountAttribute {
+	optional fixed32 killer_account_id = 1;
+	optional fixed32 victim_account_id = 2;
+	optional uint64 item_id = 3;
+	optional uint32 event_type = 4;
+	optional uint32 amount = 5;
+}
+
+message CMsgApplySticker {
+	optional uint64 sticker_item_id = 1;
+	optional uint64 item_item_id = 2;
+	optional uint32 sticker_slot = 3;
+	optional uint32 baseitem_defidx = 4;
+	optional float sticker_wear = 5;
+	optional float sticker_rotation = 6;
+	optional float sticker_scale = 7;
+	optional float sticker_offset_x = 8;
+	optional float sticker_offset_y = 9;
+}
+
+message CMsgModifyItemAttribute {
+	optional uint64 item_id = 1;
+	optional uint32 attr_defidx = 2;
+	optional uint32 attr_value = 3;
+}
+
+message CMsgApplyStatTrakSwap {
+	optional uint64 tool_item_id = 1;
+	optional uint64 item_1_item_id = 2;
+	optional uint64 item_2_item_id = 3;
+}
+
+message CMsgApplyStrangePart {
+	optional uint64 strange_part_item_id = 1;
+	optional uint64 item_item_id = 2;
+}
+
+message CMsgApplyPennantUpgrade {
+	optional uint64 upgrade_item_id = 1;
+	optional uint64 pennant_item_id = 2;
+}
+
+message CMsgApplyEggEssence {
+	optional uint64 essence_item_id = 1;
+	optional uint64 egg_item_id = 2;
+}
+
+message CSOEconItemAttribute {
+	optional uint32 def_index = 1;
+	optional uint32 value = 2;
+	optional bytes value_bytes = 3;
+}
+
+message CSOEconItemEquipped {
+	optional uint32 new_class = 1;
+	optional uint32 new_slot = 2;
+}
+
+message CSOEconItem {
+	optional uint64 id = 1;
+	optional uint32 account_id = 2;
+	optional uint32 inventory = 3;
+	optional uint32 def_index = 4;
+	optional uint32 quantity = 5;
+	optional uint32 level = 6;
+	optional uint32 quality = 7;
+	optional uint32 flags = 8 [default = 0];
+	optional uint32 origin = 9;
+	optional string custom_name = 10;
+	optional string custom_desc = 11;
+	repeated .CSOEconItemAttribute attribute = 12;
+	optional .CSOEconItem interior_item = 13;
+	optional bool in_use = 14 [default = false];
+	optional uint32 style = 15 [default = 0];
+	optional uint64 original_id = 16 [default = 0];
+	repeated .CSOEconItemEquipped equipped_state = 18;
+	optional uint32 rarity = 19;
+}
+
+message CMsgAdjustItemEquippedState {
+	optional uint64 item_id = 1;
+	optional uint32 new_class = 2;
+	optional uint32 new_slot = 3;
+	optional bool swap = 4;
+}
+
+message CMsgAdjustItemEquippedStateMulti {
+	repeated uint64 t_equips = 1;
+	repeated uint64 ct_equips = 2;
+	repeated uint64 noteam_equips = 3;
+}
+
+message CMsgSortItems {
+	optional uint32 sort_type = 1;
+}
+
+message CSOEconClaimCode {
+	optional uint32 account_id = 1;
+	optional uint32 code_type = 2;
+	optional uint32 time_acquired = 3;
+	optional string code = 4;
+}
+
+message CMsgStoreGetUserData {
+	optional fixed32 price_sheet_version = 1;
+	optional int32 currency = 2;
+}
+
+message CMsgStoreGetUserDataResponse {
+	optional int32 result = 1;
+	optional int32 currency_deprecated = 2;
+	optional string country_deprecated = 3;
+	optional fixed32 price_sheet_version = 4;
+	optional bytes price_sheet = 8;
+}
+
+message CMsgUpdateItemSchema {
+	optional bytes items_game = 1;
+	optional fixed32 item_schema_version = 2;
+	optional string items_game_url = 4;
+}
+
+message CMsgGCError {
+	optional string error_text = 1;
+}
+
+message CMsgRequestInventoryRefresh {
+}
+
+message CMsgConVarValue {
+	optional string name = 1;
+	optional string value = 2;
+}
+
+message CMsgReplicateConVars {
+	repeated .CMsgConVarValue convars = 1;
+}
+
+message CMsgUseItem {
+	optional uint64 item_id = 1;
+	optional fixed64 target_steam_id = 2;
+	repeated uint32 gift__potential_targets = 3;
+	optional uint32 duel__class_lock = 4;
+	optional fixed64 initiator_steam_id = 5;
+}
+
+message CMsgReplayUploadedToYouTube {
+	optional string youtube_url = 1;
+	optional string youtube_account_name = 2;
+	optional uint64 session_id = 3;
+}
+
+message CMsgConsumableExhausted {
+	optional int32 item_def_id = 1;
+}
+
+message CMsgItemAcknowledged__DEPRECATED {
+	optional uint32 account_id = 1;
+	optional uint32 inventory = 2;
+	optional uint32 def_index = 3;
+	optional uint32 quality = 4;
+	optional uint32 rarity = 5;
+	optional uint32 origin = 6;
+	optional uint64 item_id = 7;
+}
+
+message CMsgSetItemPositions {
+	message ItemPosition {
+		optional uint32 legacy_item_id = 1;
+		optional uint32 position = 2;
+		optional uint64 item_id = 3;
+	}
+
+	repeated .CMsgSetItemPositions.ItemPosition item_positions = 1;
+}
+
+message CMsgGCReportAbuse {
+	optional fixed64 target_steam_id = 1;
+	optional string description = 4;
+	optional uint64 gid = 5;
+	optional uint32 abuse_type = 2;
+	optional uint32 content_type = 3;
+	optional fixed32 target_game_server_ip = 6;
+	optional uint32 target_game_server_port = 7;
+}
+
+message CMsgGCReportAbuseResponse {
+	optional fixed64 target_steam_id = 1;
+	optional uint32 result = 2;
+	optional string error_message = 3;
+}
+
+message CMsgGCNameItemNotification {
+	optional fixed64 player_steamid = 1;
+	optional uint32 item_def_index = 2;
+	optional string item_name_custom = 3;
+}
+
+message CMsgGCClientDisplayNotification {
+	optional string notification_title_localization_key = 1;
+	optional string notification_body_localization_key = 2;
+	repeated string body_substring_keys = 3;
+	repeated string body_substring_values = 4;
+}
+
+message CMsgGCShowItemsPickedUp {
+	optional fixed64 player_steamid = 1;
+}
+
+message CMsgGCIncrementKillCountResponse {
+	optional uint32 killer_account_id = 1 [(key_field) = true];
+	optional uint32 num_kills = 2;
+	optional uint32 item_def = 3;
+	optional uint32 level_type = 4;
+}
+
+message CSOEconItemDropRateBonus {
+	optional uint32 account_id = 1;
+	optional fixed32 expiration_date = 2;
+	optional float bonus = 3;
+	optional uint32 bonus_count = 4;
+	optional uint64 item_id = 5;
+	optional uint32 def_index = 6;
+}
+
+message CSOEconItemLeagueViewPass {
+	optional uint32 account_id = 1 [(key_field) = true];
+	optional uint32 league_id = 2 [(key_field) = true];
+	optional uint32 admin = 3;
+	optional uint32 itemindex = 4;
+}
+
+message CSOEconItemEventTicket {
+	optional uint32 account_id = 1;
+	optional uint32 event_id = 2;
+	optional uint64 item_id = 3;
+}
+
+message CMsgGCItemPreviewItemBoughtNotification {
+	optional uint32 item_def_index = 1;
+}
+
+message CMsgGCStorePurchaseCancel {
+	optional uint64 txn_id = 1;
+}
+
+message CMsgGCStorePurchaseCancelResponse {
+	optional uint32 result = 1;
+}
+
+message CMsgGCStorePurchaseFinalize {
+	optional uint64 txn_id = 1;
+}
+
+message CMsgGCStorePurchaseFinalizeResponse {
+	optional uint32 result = 1;
+	repeated uint64 item_ids = 2;
+}
+
+message CMsgGCBannedWordListRequest {
+	optional uint32 ban_list_group_id = 1;
+	optional uint32 word_id = 2;
+}
+
+message CMsgGCRequestAnnouncements {
+}
+
+message CMsgGCRequestAnnouncementsResponse {
+	optional string announcement_title = 1;
+	optional string announcement = 2;
+	optional string nextmatch_title = 3;
+	optional string nextmatch = 4;
+}
+
+message CMsgGCBannedWord {
+	optional uint32 word_id = 1;
+	optional .GC_BannedWordType word_type = 2 [default = GC_BANNED_WORD_DISABLE_WORD];
+	optional string word = 3;
+}
+
+message CMsgGCBannedWordListResponse {
+	optional uint32 ban_list_group_id = 1;
+	repeated .CMsgGCBannedWord word_list = 2;
+}
+
+message CMsgGCToGCBannedWordListBroadcast {
+	optional .CMsgGCBannedWordListResponse broadcast = 1;
+}
+
+message CMsgGCToGCBannedWordListUpdated {
+	optional uint32 group_id = 1;
+}
+
+message CSOEconDefaultEquippedDefinitionInstanceClient {
+	optional uint32 account_id = 1 [(key_field) = true];
+	optional uint32 item_definition = 2;
+	optional uint32 class_id = 3 [(key_field) = true];
+	optional uint32 slot_id = 4 [(key_field) = true];
+}
+
+message CMsgGCToGCDirtySDOCache {
+	optional uint32 sdo_type = 1;
+	optional uint64 key_uint64 = 2;
+}
+
+message CMsgGCToGCDirtyMultipleSDOCache {
+	optional uint32 sdo_type = 1;
+	repeated uint64 key_uint64 = 2;
+}
+
+message CMsgGCCollectItem {
+	optional uint64 collection_item_id = 1;
+	optional uint64 subject_item_id = 2;
+}
+
+message CMsgSDONoMemcached {
+}
+
+message CMsgGCToGCUpdateSQLKeyValue {
+	optional string key_name = 1;
+}
+
+message CMsgGCToGCIsTrustedServer {
+	optional fixed64 steam_id = 1;
+}
+
+message CMsgGCToGCIsTrustedServerResponse {
+	optional bool is_trusted = 1;
+}
+
+message CMsgGCToGCBroadcastConsoleCommand {
+	optional string con_command = 1;
+}
+
+message CMsgGCServerVersionUpdated {
+	optional uint32 server_version = 1;
+}
+
+message CMsgGCClientVersionUpdated {
+	optional uint32 client_version = 1;
+}
+
+message CMsgGCToGCWebAPIAccountChanged {
+}
+
+message CMsgGCToGCRequestPassportItemGrant {
+	optional fixed64 steam_id = 1;
+	optional uint32 league_id = 2;
+	optional int32 reward_flag = 3;
+}
+
+message CMsgGameServerInfo {
+	enum ServerType {
+		UNSPECIFIED = 0;
+		GAME = 1;
+		PROXY = 2;
+	}
+
+	optional fixed32 server_public_ip_addr = 1;
+	optional fixed32 server_private_ip_addr = 2;
+	optional uint32 server_port = 3;
+	optional uint32 server_tv_port = 4;
+	optional string server_key = 5;
+	optional bool server_hibernation = 6;
+	optional .CMsgGameServerInfo.ServerType server_type = 7 [default = UNSPECIFIED];
+	optional uint32 server_region = 8;
+	optional float server_loadavg = 9;
+	optional float server_tv_broadcast_time = 10;
+	optional float server_game_time = 11;
+	optional fixed64 server_relay_connected_steam_id = 12;
+	optional uint32 relay_slots_max = 13;
+	optional int32 relays_connected = 14;
+	optional int32 relay_clients_connected = 15;
+	optional fixed64 relayed_game_server_steam_id = 16;
+	optional uint32 parent_relay_count = 17;
+	optional fixed64 tv_secret_code = 18;
+}
+
+message CSOEconEquipSlot {
+	optional uint32 account_id = 1 [(key_field) = true];
+	optional uint32 class_id = 2 [(key_field) = true];
+	optional uint32 slot_id = 3 [(key_field) = true];
+	optional uint64 item_id = 4;
+	optional uint32 item_definition = 5;
+}
+
+message CMsgAdjustEquipSlot {
+	optional uint32 class_id = 1;
+	optional uint32 slot_id = 2;
+	optional uint64 item_id = 3;
+}
+
+message CMsgAdjustEquipSlots {
+	repeated .CMsgAdjustEquipSlot slots = 1;
+	optional uint32 change_num = 2;
+}
+
+message CMsgOpenCrate {
+	optional uint64 tool_item_id = 1;
+	optional uint64 subject_item_id = 2;
+	optional bool for_rental = 3;
+}
+
+message CSOEconRentalHistory {
+	optional uint32 account_id = 1 [(key_field) = true];
+	optional uint64 crate_item_id = 2 [(key_field) = true];
+	optional uint32 crate_def_index = 3;
+	optional uint32 issue_date = 4;
+	optional uint32 expiration_date = 5;
+}
+
+message CMsgAcknowledgeRentalExpiration {
+	optional uint64 crate_item_id = 1;
+}