diff --git a/code/__DEFINES/tgs.dm b/code/__DEFINES/tgs.dm
index 6187a67825a4..7e1ba820dd8b 100644
--- a/code/__DEFINES/tgs.dm
+++ b/code/__DEFINES/tgs.dm
@@ -1,18 +1,19 @@
 // tgstation-server DMAPI
+// The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in IETF RFC 2119.
 
-#define TGS_DMAPI_VERSION "6.5.3"
+#define TGS_DMAPI_VERSION "7.3.1"
 
 // All functions and datums outside this document are subject to change with any version and should not be relied on.
 
 // CONFIGURATION
 
-/// Create this define if you want to do TGS configuration outside of this file.
+/// Consumers SHOULD create this define if you want to do TGS configuration outside of this file.
 #ifndef TGS_EXTERNAL_CONFIGURATION
 
-// Comment this out once you've filled in the below.
+// Consumers MUST comment this out once you've filled in the below and are not using [TGS_EXTERNAL_CONFIGURATION].
 #error TGS API unconfigured
 
-// Uncomment this if you wish to allow the game to interact with TGS 3..
+// Consumers MUST uncomment this if you wish to allow the game to interact with TGS version 3.
 // This will raise the minimum required security level of your game to TGS_SECURITY_TRUSTED due to it utilizing call()().
 //#define TGS_V3_API
 
@@ -50,6 +51,18 @@
 
 #endif
 
+#ifndef TGS_FILE2TEXT_NATIVE
+#ifdef file2text
+#error Your codebase is re-defining the BYOND proc file2text. The DMAPI requires the native version to read the result of world.Export(). You SHOULD fix this by adding "#define TGS_FILE2TEXT_NATIVE file2text" before your override of file2text to allow the DMAPI to use the native version. This will only be used for world.Export(), not regular file accesses
+#endif
+#define TGS_FILE2TEXT_NATIVE file2text
+#endif
+
+// SpacemanDMM compatibility
+#ifndef CAN_BE_REDEFINED
+#define CAN_BE_REDEFINED(X)
+#endif
+
 // EVENT CODES
 
 /// Before a reboot mode change, extras parameters are the current and new reboot mode enums.
@@ -73,12 +86,12 @@
 #define TGS_EVENT_REPO_MERGE_PULL_REQUEST 3
 /// Before the repository makes a sychronize operation. Parameters: Absolute repostiory path.
 #define TGS_EVENT_REPO_PRE_SYNCHRONIZE 4
-/// Before a BYOND install operation begins. Parameters: [/datum/tgs_version] of the installing BYOND.
-#define TGS_EVENT_BYOND_INSTALL_START 5
-/// When a BYOND install operation fails. Parameters: Error message
-#define TGS_EVENT_BYOND_INSTALL_FAIL 6
-/// When the active BYOND version changes.  Parameters: (Nullable) [/datum/tgs_version] of the current BYOND, [/datum/tgs_version] of the new BYOND.
-#define TGS_EVENT_BYOND_ACTIVE_VERSION_CHANGE 7
+/// Before a engine install operation begins. Parameters: Version string of the installing engine.
+#define TGS_EVENT_ENGINE_INSTALL_START 5
+/// When a engine install operation fails. Parameters: Error message
+#define TGS_EVENT_ENGINE_INSTALL_FAIL 6
+/// When the active engine version changes. Parameters: (Nullable) Version string of the current engine, version string of the new engine.
+#define TGS_EVENT_ENGINE_ACTIVE_VERSION_CHANGE 7
 /// When the compiler starts running. Parameters: Game directory path, origin commit SHA.
 #define TGS_EVENT_COMPILE_START 8
 /// When a compile is cancelled. No parameters.
@@ -108,7 +121,7 @@
 // #define TGS_EVENT_DREAM_DAEMON_LAUNCH 22
 /// After a single submodule update is performed. Parameters: Updated submodule name.
 #define TGS_EVENT_REPO_SUBMODULE_UPDATE 23
-/// After CodeModifications are applied, before DreamMaker is run. Parameters: Game directory path, origin commit sha, byond version.
+/// After CodeModifications are applied, before DreamMaker is run. Parameters: Game directory path, origin commit sha, version string of the used engine.
 #define TGS_EVENT_PRE_DREAM_MAKER 24
 /// Whenever a deployment folder is deleted from disk. Parameters: Game directory path.
 #define TGS_EVENT_DEPLOYMENT_CLEANUP 25
@@ -122,6 +135,7 @@
 /// The watchdog will restart on reboot.
 #define TGS_REBOOT_MODE_RESTART 2
 
+// Note that security levels are currently meaningless in OpenDream
 /// DreamDaemon Trusted security level.
 #define TGS_SECURITY_TRUSTED 0
 /// DreamDaemon Safe security level.
@@ -129,34 +143,48 @@
 /// DreamDaemon Ultrasafe security level.
 #define TGS_SECURITY_ULTRASAFE 2
 
+/// DreamDaemon public visibility level.
+#define TGS_VISIBILITY_PUBLIC 0
+/// DreamDaemon private visibility level.
+#define TGS_VISIBILITY_PRIVATE 1
+/// DreamDaemon invisible visibility level.
+#define TGS_VISIBILITY_INVISIBLE 2
+
+/// The Build Your Own Net Dream engine.
+#define TGS_ENGINE_TYPE_BYOND 0
+/// The OpenDream engine.
+#define TGS_ENGINE_TYPE_OPENDREAM 1
+
 //REQUIRED HOOKS
 
 /**
- * Call this somewhere in [/world/proc/New] that is always run. This function may sleep!
+ * Consumers MUST call this somewhere in [/world/proc/New] that is always run. This function may sleep!
  *
  * * event_handler - Optional user defined [/datum/tgs_event_handler].
  * * minimum_required_security_level: The minimum required security level to run the game in which the DMAPI is integrated. Can be one of [TGS_SECURITY_ULTRASAFE], [TGS_SECURITY_SAFE], or [TGS_SECURITY_TRUSTED].
+ * * http_handler - Optional user defined [/datum/tgs_http_handler].
  */
-/world/proc/TgsNew(datum/tgs_event_handler/event_handler, minimum_required_security_level = TGS_SECURITY_ULTRASAFE)
+/world/proc/TgsNew(datum/tgs_event_handler/event_handler, minimum_required_security_level = TGS_SECURITY_ULTRASAFE, datum/tgs_http_handler/http_handler)
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /**
- * Call this when your initializations are complete and your game is ready to play before any player interactions happen.
+ * Consumers MUST call this when world initializations are complete and the game is ready to play before any player interactions happen.
  *
  * This may use [/world/var/sleep_offline] to make this happen so ensure no changes are made to it while this call is running.
  * Afterwards, consider explicitly setting it to what you want to avoid this BYOND bug: http://www.byond.com/forum/post/2575184
  * This function should not be called before ..() in [/world/proc/New].
  */
 /world/proc/TgsInitializationComplete()
+	CAN_BE_REDEFINED(TRUE)
 	return
 
-/// Put this at the start of [/world/proc/Topic].
+/// Consumers MUST run this macro at the start of [/world/proc/Topic].
 #define TGS_TOPIC var/tgs_topic_return = TgsTopic(args[1]); if(tgs_topic_return) return tgs_topic_return
 
-/**
- * Call this as late as possible in [world/proc/Reboot] (BEFORE ..()).
- */
+/// Consumers MUST call this as late as possible in [world/proc/Reboot] (BEFORE ..()).
 /world/proc/TgsReboot()
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 // DATUM DEFINITIONS
@@ -194,6 +222,7 @@
  * Returns [TRUE]/[FALSE] based on if the [/datum/tgs_version] contains wildcards.
  */
 /datum/tgs_version/proc/Wildcard()
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /**
@@ -202,6 +231,7 @@
  * other_version - The [/datum/tgs_version] to compare against.
  */
 /datum/tgs_version/proc/Equals(datum/tgs_version/other_version)
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /// Represents a merge of a GitHub pull request.
@@ -249,7 +279,7 @@
 	/// The [/datum/tgs_chat_channel] the user was from.
 	var/datum/tgs_chat_channel/channel
 
-/// User definable handler for TGS events.
+/// User definable handler for TGS events This abstract version SHOULD be overridden to be used.
 /datum/tgs_event_handler
 	/// If the handler receieves [TGS_EVENT_HEALTH_CHECK] events.
 	var/receive_health_checks = FALSE
@@ -263,7 +293,41 @@
 	set waitfor = FALSE
 	return
 
-/// User definable chat command.
+/// User definable handler for HTTP calls. This abstract version MUST be overridden to be used.
+/datum/tgs_http_handler
+
+/**
+ * User definable callback for executing HTTP GET requests.
+ * MUST perform BYOND sleeps while the request is in flight.
+ * MUST return a [/datum/tgs_http_result].
+ * SHOULD log its own errors
+ *
+ * url - The full URL to execute the GET request for including query parameters.
+ */
+/datum/tgs_http_handler/proc/PerformGet(url)
+	CRASH("[type]/PerformGet not implemented!")
+
+/// Result of a [/datum/tgs_http_handler] call. MUST NOT be overridden.
+/datum/tgs_http_result
+	/// HTTP response as text
+	var/response_text
+	/// Boolean request success flag. Set for any 2XX response code.
+	var/success
+
+/**
+ * Create a [/datum/tgs_http_result].
+ *
+ * * response_text - HTTP response as text. Must be provided in New().
+ * * success - Boolean request success flag. Set for any 2XX response code. Must be provided in New().
+ */
+/datum/tgs_http_result/New(response_text, success)
+	if(response_text && !istext(response_text))
+		CRASH("response_text was not text!")
+
+	src.response_text = response_text
+	src.success = success
+
+/// User definable chat command. This abstract version MUST be overridden to be used.
 /datum/tgs_chat_command
 	/// The string to trigger this command on a chat bot. e.g `@bot name ...` or `!tgs name ...`.
 	var/name = ""
@@ -276,29 +340,36 @@
 
 /**
  * Process command activation. Should return a [/datum/tgs_message_content] to respond to the issuer with.
+ * MUST be implemented
  *
- * sender - The [/datum/tgs_chat_user] who issued the command.
- * params - The trimmed string following the command `/datum/tgs_chat_command/var/name].
+ * * sender - The [/datum/tgs_chat_user] who issued the command.
+ * * params - The trimmed string following the command `/datum/tgs_chat_command/var/name].
  */
 /datum/tgs_chat_command/proc/Run(datum/tgs_chat_user/sender, params)
 	CRASH("[type] has no implementation for Run()")
 
-/// User definable chat message.
+/// User definable chat message. MUST NOT be overridden.
 /datum/tgs_message_content
-	/// The tring content of the message. Must be provided in New().
+	/// The string content of the message. Must be provided in New().
 	var/text
 
 	/// The [/datum/tgs_chat_embed] to embed in the message. Not supported on all chat providers.
 	var/datum/tgs_chat_embed/structure/embed
 
+/**
+ * Create a [/datum/tgs_message_content].
+ *
+ * * text - The string content of the message.
+ */
 /datum/tgs_message_content/New(text)
+	..()
 	if(!istext(text))
 		TGS_ERROR_LOG("[/datum/tgs_message_content] created with no text!")
 		text = null
 
 	src.text = text
 
-/// User definable chat embed. Currently mirrors Discord chat embeds. See https://discord.com/developers/docs/resources/channel#embed-object-embed-structure for details.
+/// User definable chat embed. Currently mirrors Discord chat embeds. See https://discord.com/developers/docs/resources/message#embed-object for details.
 /datum/tgs_chat_embed/structure
 	var/title
 	var/description
@@ -310,13 +381,13 @@
 	/// Colour must be #AARRGGBB or #RRGGBB hex string.
 	var/colour
 
-	/// See https://discord.com/developers/docs/resources/channel#embed-object-embed-image-structure for details.
+	/// See https://discord.com/developers/docs/resources/message#embed-object-embed-image-structure for details.
 	var/datum/tgs_chat_embed/media/image
 
-	/// See https://discord.com/developers/docs/resources/channel#embed-object-embed-thumbnail-structure for details.
+	/// See https://discord.com/developers/docs/resources/message#embed-object-embed-thumbnail-structure for details.
 	var/datum/tgs_chat_embed/media/thumbnail
 
-	/// See https://discord.com/developers/docs/resources/channel#embed-object-embed-image-structure for details.
+	/// See https://discord.com/developers/docs/resources/message#embed-object-embed-video-structure for details.
 	var/datum/tgs_chat_embed/media/video
 
 	var/datum/tgs_chat_embed/footer/footer
@@ -325,7 +396,7 @@
 
 	var/list/datum/tgs_chat_embed/field/fields
 
-/// Common datum for similar discord embed medias.
+/// Common datum for similar Discord embed medias.
 /datum/tgs_chat_embed/media
 	/// Must be set in New().
 	var/url
@@ -333,48 +404,58 @@
 	var/height
 	var/proxy_url
 
+/// Create a [/datum/tgs_chat_embed].
 /datum/tgs_chat_embed/media/New(url)
+	..()
 	if(!istext(url))
 		CRASH("[/datum/tgs_chat_embed/media] created with no url!")
 
 	src.url = url
 
-/// See https://discord.com/developers/docs/resources/channel#embed-object-embed-footer-structure for details.
+/// See https://discord.com/developers/docs/resources/message#embed-object-embed-footer-structure for details.
 /datum/tgs_chat_embed/footer
 	/// Must be set in New().
 	var/text
 	var/icon_url
 	var/proxy_icon_url
 
+/// Create a [/datum/tgs_chat_embed/footer].
 /datum/tgs_chat_embed/footer/New(text)
+	..()
 	if(!istext(text))
 		CRASH("[/datum/tgs_chat_embed/footer] created with no text!")
 
 	src.text = text
 
-/// See https://discord.com/developers/docs/resources/channel#embed-object-embed-provider-structure for details.
+/// See https://discord.com/developers/docs/resources/message#embed-object-embed-provider-structure for details.
 /datum/tgs_chat_embed/provider
 	var/name
 	var/url
 
-/// See https://discord.com/developers/docs/resources/channel#embed-object-embed-author-structure for details. Must have name set in New().
+/// See https://discord.com/developers/docs/resources/message#embed-object-embed-author-structure for details. Must have name set in New().
 /datum/tgs_chat_embed/provider/author
 	var/icon_url
 	var/proxy_icon_url
 
+/// Create a [/datum/tgs_chat_embed/footer].
 /datum/tgs_chat_embed/provider/author/New(name)
+	..()
 	if(!istext(name))
 		CRASH("[/datum/tgs_chat_embed/provider/author] created with no name!")
 
 	src.name = name
 
-/// See https://discord.com/developers/docs/resources/channel#embed-object-embed-field-structure for details. Must have name and value set in New().
+/// See https://discord.com/developers/docs/resources/message#embed-object-embed-field-structure for details.
 /datum/tgs_chat_embed/field
+	/// Must be set in New().
 	var/name
+	/// Must be set in New().
 	var/value
 	var/is_inline
 
+/// Create a [/datum/tgs_chat_embed/field].
 /datum/tgs_chat_embed/field/New(name, value)
+	..()
 	if(!istext(name))
 		CRASH("[/datum/tgs_chat_embed/field] created with no name!")
 
@@ -388,16 +469,19 @@
 
 /// Returns the maximum supported [/datum/tgs_version] of the DMAPI.
 /world/proc/TgsMaximumApiVersion()
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /// Returns the minimum supported [/datum/tgs_version] of the DMAPI.
 /world/proc/TgsMinimumApiVersion()
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /**
  * Returns [TRUE] if DreamDaemon was launched under TGS, the API matches, and was properly initialized. [FALSE] will be returned otherwise.
  */
 /world/proc/TgsAvailable()
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 // No function below this succeeds if it TgsAvailable() returns FALSE or if TgsNew() has yet to be called.
@@ -409,67 +493,102 @@
  * If TGS has not requested a [TGS_REBOOT_MODE_SHUTDOWN] DreamDaemon will be launched again.
  */
 /world/proc/TgsEndProcess()
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /**
  * Send a message to connected chats. This function may sleep!
+ * If TGS is offline when called, the message may be placed in a queue to be sent and this function will return immediately. Your message will be sent when TGS reconnects to the game.
  *
  * message - The [/datum/tgs_message_content] to send.
  * admin_only: If [TRUE], message will be sent to admin connected chats. Vice-versa applies.
  */
 /world/proc/TgsTargetedChatBroadcast(datum/tgs_message_content/message, admin_only = FALSE)
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /**
  * Send a private message to a specific user. This function may sleep!
+ * If TGS is offline when called, the message may be placed in a queue to be sent and this function will return immediately. Your message will be sent when TGS reconnects to the game.
  *
  * message - The [/datum/tgs_message_content] to send.
  * user: The [/datum/tgs_chat_user] to PM.
  */
 /world/proc/TgsChatPrivateMessage(datum/tgs_message_content/message, datum/tgs_chat_user/user)
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /**
  * Send a message to connected chats that are flagged as game-related in TGS. This function may sleep!
+ * If TGS is offline when called, the message may be placed in a queue to be sent and this function will return immediately. Your message will be sent when TGS reconnects to the game.
  *
  * message - The [/datum/tgs_message_content] to send.
  * channels - Optional list of [/datum/tgs_chat_channel]s to restrict the message to.
  */
 /world/proc/TgsChatBroadcast(datum/tgs_message_content/message, list/channels = null)
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /// Returns the current [/datum/tgs_version] of TGS if it is running the server, null otherwise. This function may sleep if the call to [/world/proc/TgsNew] is sleeping!
 /world/proc/TgsVersion()
+	CAN_BE_REDEFINED(TRUE)
+	return
+
+/// Returns the running engine type
+/world/proc/TgsEngine()
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /// Returns the current [/datum/tgs_version] of the DMAPI being used if it was activated, null otherwise. This function may sleep if the call to [/world/proc/TgsNew] is sleeping!
 /world/proc/TgsApiVersion()
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /// Returns the name of the TGS instance running the game if TGS is present, null otherwise. This function may sleep if the call to [/world/proc/TgsNew] is sleeping!
 /world/proc/TgsInstanceName()
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /// Return the current [/datum/tgs_revision_information] of the running server if TGS is present, null otherwise. This function may sleep if the call to [/world/proc/TgsNew] is sleeping!
 /world/proc/TgsRevision()
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /// Returns the current BYOND security level as a TGS_SECURITY_ define if TGS is present, null otherwise. This function may sleep if the call to [/world/proc/TgsNew] is sleeping!
 /world/proc/TgsSecurityLevel()
+	CAN_BE_REDEFINED(TRUE)
+	return
+
+/// Returns the current BYOND visibility level as a TGS_VISIBILITY_ define if TGS is present, null otherwise. Requires TGS to be using interop API version 5 or higher otherwise the string "___unimplemented" wil be returned. This function may sleep if the call to [/world/proc/TgsNew] is sleeping!
+/world/proc/TgsVisibility()
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /// Returns a list of active [/datum/tgs_revision_information/test_merge]s if TGS is present, null otherwise. This function may sleep if the call to [/world/proc/TgsNew] is sleeping!
 /world/proc/TgsTestMerges()
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /// Returns a list of connected [/datum/tgs_chat_channel]s if TGS is present, null otherwise. This function may sleep if the call to [/world/proc/TgsNew] is sleeping!
 /world/proc/TgsChatChannelInfo()
+	CAN_BE_REDEFINED(TRUE)
+	return
+
+/**
+ * Trigger an event in TGS. Requires TGS version >= 6.3.0. Returns [TRUE] if the event was triggered successfully, [FALSE] otherwise. This function may sleep!
+ *
+ * event_name - The name of the event to trigger
+ * parameters - Optional list of string parameters to pass as arguments to the event script. The first parameter passed to a script will always be the running game's directory followed by these parameters.
+ * wait_for_completion - If set, this function will not return until the event has run to completion.
+ */
+/world/proc/TgsTriggerEvent(event_name, list/parameters, wait_for_completion = FALSE)
+	CAN_BE_REDEFINED(TRUE)
 	return
 
 /*
 The MIT License
 
-Copyright (c) 2017-2023 Jordan Brown
+Copyright (c) 2017-2024 Jordan Brown
 
 Permission is hereby granted, free of charge,
 to any person obtaining a copy of this software and
diff --git a/code/modules/tgs/LICENSE b/code/modules/tgs/LICENSE
index 85bca8c3f814..8991a68881b4 100644
--- a/code/modules/tgs/LICENSE
+++ b/code/modules/tgs/LICENSE
@@ -1,6 +1,6 @@
 The MIT License
 
-Copyright (c) 2017-2023 Jordan Brown
+Copyright (c) 2017-2024 Jordan Brown
 
 Permission is hereby granted, free of charge,
 to any person obtaining a copy of this software and
diff --git a/code/modules/tgs/README.md b/code/modules/tgs/README.md
index 6319028d8106..35ca73d7e9a8 100644
--- a/code/modules/tgs/README.md
+++ b/code/modules/tgs/README.md
@@ -1,6 +1,6 @@
 # DMAPI Internals
 
-This folder should be placed on it's own inside a codebase that wishes to use the TGS DMAPI. Warranty void if modified.
+This folder should be placed on its own inside a codebase that wishes to use the TGS DMAPI. Warranty void if modified.
 
 - [includes.dm](./includes.dm) is the file that should be included by DM code, it handles including the rest.
 - The [core](./core) folder includes all code not directly part of any API version.
diff --git a/code/modules/tgs/core/README.md b/code/modules/tgs/core/README.md
index b82d8f49e297..965e21b549a3 100644
--- a/code/modules/tgs/core/README.md
+++ b/code/modules/tgs/core/README.md
@@ -3,7 +3,7 @@
 This folder contains all DMAPI code not directly involved in an API.
 
 - [_definitions.dm](./definitions.dm) contains defines needed across DMAPI internals.
+- [byond_world_export.dm](./byond_world_export.dm) contains the default `/datum/tgs_http_handler` implementation which uses `world.Export()`.
 - [core.dm](./core.dm) contains the implementations of the `/world/proc/TgsXXX()` procs. Many map directly to the `/datum/tgs_api` functions. It also contains the /datum selection and setup code.
 - [datum.dm](./datum.dm) contains the `/datum/tgs_api` declarations that all APIs must implement.
 - [tgs_version.dm](./tgs_version.dm) contains the `/datum/tgs_version` definition
-- 
diff --git a/code/modules/tgs/core/byond_world_export.dm b/code/modules/tgs/core/byond_world_export.dm
new file mode 100644
index 000000000000..6ef8d841b8f7
--- /dev/null
+++ b/code/modules/tgs/core/byond_world_export.dm
@@ -0,0 +1,22 @@
+/datum/tgs_http_handler/byond_world_export
+
+/datum/tgs_http_handler/byond_world_export/PerformGet(url)
+	// This is an infinite sleep until we get a response
+	var/export_response = world.Export(url)
+	TGS_DEBUG_LOG("byond_world_export: Export complete")
+
+	if(!export_response)
+		TGS_ERROR_LOG("byond_world_export: Failed request: [url]")
+		return new /datum/tgs_http_result(null, FALSE)
+
+	var/content = export_response["CONTENT"]
+	if(!content)
+		TGS_ERROR_LOG("byond_world_export: Failed request, missing content!")
+		return new /datum/tgs_http_result(null, FALSE)
+
+	var/response_json = TGS_FILE2TEXT_NATIVE(content)
+	if(!response_json)
+		TGS_ERROR_LOG("byond_world_export: Failed request, failed to load content!")
+		return new /datum/tgs_http_result(null, FALSE)
+
+	return new /datum/tgs_http_result(response_json, TRUE)
diff --git a/code/modules/tgs/core/core.dm b/code/modules/tgs/core/core.dm
index 41a047339452..63cb5a2c3514 100644
--- a/code/modules/tgs/core/core.dm
+++ b/code/modules/tgs/core/core.dm
@@ -1,4 +1,4 @@
-/world/TgsNew(datum/tgs_event_handler/event_handler, minimum_required_security_level = TGS_SECURITY_ULTRASAFE)
+/world/TgsNew(datum/tgs_event_handler/event_handler, minimum_required_security_level = TGS_SECURITY_ULTRASAFE, datum/tgs_http_handler/http_handler = null)
 	var/current_api = TGS_READ_GLOBAL(tgs)
 	if(current_api)
 		TGS_ERROR_LOG("API datum already set (\ref[current_api] ([current_api]))! Was TgsNew() called more than once?")
@@ -42,11 +42,11 @@
 
 	var/datum/tgs_version/max_api_version = TgsMaximumApiVersion();
 	if(version.suite != null && version.minor != null && version.patch != null && version.deprecated_patch != null && version.deprefixed_parameter > max_api_version.deprefixed_parameter)
-		TGS_ERROR_LOG("Detected unknown API version! Defaulting to latest. Update the DMAPI to fix this problem.")
+		TGS_ERROR_LOG("Detected unknown Interop API version! Defaulting to latest. Update the DMAPI to fix this problem.")
 		api_datum = /datum/tgs_api/latest
 
 	if(!api_datum)
-		TGS_ERROR_LOG("Found unsupported API version: [raw_parameter]. If this is a valid version please report this, backporting is done on demand.")
+		TGS_ERROR_LOG("Found unsupported Interop API version: [raw_parameter]. If this is a valid version please report this, backporting is done on demand.")
 		return
 
 	TGS_INFO_LOG("Activating API for version [version.deprefixed_parameter]")
@@ -55,7 +55,10 @@
 		TGS_ERROR_LOG("Invalid parameter for event_handler: [event_handler]")
 		event_handler = null
 
-	var/datum/tgs_api/new_api = new api_datum(event_handler, version)
+	if(!http_handler)
+		http_handler = new /datum/tgs_http_handler/byond_world_export
+
+	var/datum/tgs_api/new_api = new api_datum(event_handler, version, http_handler)
 
 	TGS_WRITE_GLOBAL(tgs, new_api)
 
@@ -107,6 +110,13 @@
 	if(api)
 		return api.ApiVersion()
 
+/world/TgsEngine()
+#ifdef OPENDREAM
+	return TGS_ENGINE_TYPE_OPENDREAM
+#else
+	return TGS_ENGINE_TYPE_BYOND
+#endif
+
 /world/TgsInstanceName()
 	var/datum/tgs_api/api = TGS_READ_GLOBAL(tgs)
 	if(api)
@@ -153,4 +163,17 @@
 /world/TgsSecurityLevel()
 	var/datum/tgs_api/api = TGS_READ_GLOBAL(tgs)
 	if(api)
-		api.SecurityLevel()
+		return api.SecurityLevel()
+
+/world/TgsVisibility()
+	var/datum/tgs_api/api = TGS_READ_GLOBAL(tgs)
+	if(api)
+		return api.Visibility()
+
+/world/TgsTriggerEvent(event_name, list/parameters, wait_for_completion = FALSE)
+	var/datum/tgs_api/api = TGS_READ_GLOBAL(tgs)
+	if(api)
+		if(!istype(parameters, /list))
+			parameters = list()
+
+		return api.TriggerEvent(event_name, parameters, wait_for_completion)
diff --git a/code/modules/tgs/core/datum.dm b/code/modules/tgs/core/datum.dm
index 68b0330fe860..3ca53e9bf7c6 100644
--- a/code/modules/tgs/core/datum.dm
+++ b/code/modules/tgs/core/datum.dm
@@ -6,11 +6,20 @@ TGS_DEFINE_AND_SET_GLOBAL(tgs, null)
 
 	var/list/warned_deprecated_command_runs
 
-/datum/tgs_api/New(datum/tgs_event_handler/event_handler, datum/tgs_version/version)
-	. = ..()
+/datum/tgs_api/New(datum/tgs_event_handler/event_handler, datum/tgs_version/version, datum/tgs_http_handler/http_handler)
+	..()
 	src.event_handler = event_handler
 	src.version = version
 
+/datum/tgs_api/proc/TerminateWorld()
+	while(TRUE)
+		TGS_DEBUG_LOG("About to terminate world. Tick: [world.time], sleep_offline: [world.sleep_offline]")
+		world.sleep_offline = FALSE // https://www.byond.com/forum/post/2894866
+		del(world)
+		world.sleep_offline = FALSE // just in case, this is BYOND after all...
+		sleep(world.tick_lag)
+		TGS_DEBUG_LOG("BYOND DIDN'T TERMINATE THE WORLD!!! TICK IS: [world.time], sleep_offline: [world.sleep_offline]")
+
 /datum/tgs_api/latest
 	parent_type = /datum/tgs_api/v5
 
@@ -57,3 +66,9 @@ TGS_PROTECT_DATUM(/datum/tgs_api)
 
 /datum/tgs_api/proc/SecurityLevel()
 	return TGS_UNIMPLEMENTED
+
+/datum/tgs_api/proc/Visibility()
+	return TGS_UNIMPLEMENTED
+
+/datum/tgs_api/proc/TriggerEvent(event_name, list/parameters, wait_for_completion)
+	return FALSE
diff --git a/code/modules/tgs/core/tgs_version.dm b/code/modules/tgs/core/tgs_version.dm
index a5dae1241a30..bc561e67487a 100644
--- a/code/modules/tgs/core/tgs_version.dm
+++ b/code/modules/tgs/core/tgs_version.dm
@@ -1,4 +1,5 @@
 /datum/tgs_version/New(raw_parameter)
+	..()
 	src.raw_parameter = raw_parameter
 	deprefixed_parameter = replacetext(raw_parameter, "/tg/station 13 Server v", "")
 	var/list/version_bits = splittext(deprefixed_parameter, ".")
diff --git a/code/modules/tgs/includes.dm b/code/modules/tgs/includes.dm
index 23b714f9d064..f5118ed55a3c 100644
--- a/code/modules/tgs/includes.dm
+++ b/code/modules/tgs/includes.dm
@@ -1,4 +1,5 @@
 #include "core\_definitions.dm"
+#include "core\byond_world_export.dm"
 #include "core\core.dm"
 #include "core\datum.dm"
 #include "core\tgs_version.dm"
diff --git a/code/modules/tgs/v4/api.dm b/code/modules/tgs/v4/api.dm
index b9a75c4abb48..7c87922750b9 100644
--- a/code/modules/tgs/v4/api.dm
+++ b/code/modules/tgs/v4/api.dm
@@ -73,7 +73,7 @@
 	if(cached_json["apiValidateOnly"])
 		TGS_INFO_LOG("Validating API and exiting...")
 		Export(TGS4_COMM_VALIDATE, list(TGS4_PARAMETER_DATA = "[minimum_required_security_level]"))
-		del(world)
+		TerminateWorld()
 
 	security_level = cached_json["securityLevel"]
 	chat_channels_json_path = cached_json["chatChannelsJson"]
@@ -181,14 +181,14 @@
 	var/json = json_encode(data)
 
 	while(requesting_new_port && !override_requesting_new_port)
-		sleep(1)
+		sleep(world.tick_lag)
 
 	//we need some port open at this point to facilitate return communication
 	if(!world.port)
 		requesting_new_port = TRUE
 		if(!world.OpenPort(0)) //open any port
 			TGS_ERROR_LOG("Unable to open random port to retrieve new port![TGS4_PORT_CRITFAIL_MESSAGE]")
-			del(world)
+			TerminateWorld()
 
 		//request a new port
 		export_lock = FALSE
@@ -196,20 +196,20 @@
 
 		if(!new_port_json)
 			TGS_ERROR_LOG("No new port response from server![TGS4_PORT_CRITFAIL_MESSAGE]")
-			del(world)
+			TerminateWorld()
 
 		var/new_port = new_port_json[TGS4_PARAMETER_DATA]
 		if(!isnum(new_port) || new_port <= 0)
 			TGS_ERROR_LOG("Malformed new port json ([json_encode(new_port_json)])![TGS4_PORT_CRITFAIL_MESSAGE]")
-			del(world)
+			TerminateWorld()
 
 		if(new_port != world.port && !world.OpenPort(new_port))
 			TGS_ERROR_LOG("Unable to open port [new_port]![TGS4_PORT_CRITFAIL_MESSAGE]")
-			del(world)
+			TerminateWorld()
 		requesting_new_port = FALSE
 
 	while(export_lock)
-		sleep(1)
+		sleep(world.tick_lag)
 	export_lock = TRUE
 
 	last_interop_response = null
@@ -217,7 +217,7 @@
 	text2file(json, server_commands_json_path)
 
 	for(var/I = 0; I < EXPORT_TIMEOUT_DS && !last_interop_response; ++I)
-		sleep(1)
+		sleep(world.tick_lag)
 
 	if(!last_interop_response)
 		TGS_ERROR_LOG("Failed to get export result for: [json]")
diff --git a/code/modules/tgs/v5/__interop_version.dm b/code/modules/tgs/v5/__interop_version.dm
index 5d3d491a7362..29ea239ad84d 100644
--- a/code/modules/tgs/v5/__interop_version.dm
+++ b/code/modules/tgs/v5/__interop_version.dm
@@ -1 +1 @@
-"5.6.1"
+"5.10.0"
diff --git a/code/modules/tgs/v5/_defines.dm b/code/modules/tgs/v5/_defines.dm
index f973338daa03..a47bfd78000b 100644
--- a/code/modules/tgs/v5/_defines.dm
+++ b/code/modules/tgs/v5/_defines.dm
@@ -8,16 +8,17 @@
 #define DMAPI5_TOPIC_REQUEST_LIMIT 65528
 #define DMAPI5_TOPIC_RESPONSE_LIMIT 65529
 
-#define DMAPI5_BRIDGE_COMMAND_PORT_UPDATE 0
 #define DMAPI5_BRIDGE_COMMAND_STARTUP 1
 #define DMAPI5_BRIDGE_COMMAND_PRIME 2
 #define DMAPI5_BRIDGE_COMMAND_REBOOT 3
 #define DMAPI5_BRIDGE_COMMAND_KILL 4
 #define DMAPI5_BRIDGE_COMMAND_CHAT_SEND 5
 #define DMAPI5_BRIDGE_COMMAND_CHUNK 6
+#define DMAPI5_BRIDGE_COMMAND_EVENT 7
 
 #define DMAPI5_PARAMETER_ACCESS_IDENTIFIER "accessIdentifier"
 #define DMAPI5_PARAMETER_CUSTOM_COMMANDS "customCommands"
+#define DMAPI5_PARAMETER_TOPIC_PORT "topicPort"
 
 #define DMAPI5_CHUNK "chunk"
 #define DMAPI5_CHUNK_PAYLOAD "payload"
@@ -34,6 +35,7 @@
 #define DMAPI5_BRIDGE_PARAMETER_VERSION "version"
 #define DMAPI5_BRIDGE_PARAMETER_CHAT_MESSAGE "chatMessage"
 #define DMAPI5_BRIDGE_PARAMETER_MINIMUM_SECURITY_LEVEL "minimumSecurityLevel"
+#define DMAPI5_BRIDGE_PARAMETER_EVENT_INVOCATION "eventInvocation"
 
 #define DMAPI5_BRIDGE_RESPONSE_NEW_PORT "newPort"
 #define DMAPI5_BRIDGE_RESPONSE_RUNTIME_INFORMATION "runtimeInformation"
@@ -48,6 +50,7 @@
 #define DMAPI5_RUNTIME_INFORMATION_REVISION "revision"
 #define DMAPI5_RUNTIME_INFORMATION_TEST_MERGES "testMerges"
 #define DMAPI5_RUNTIME_INFORMATION_SECURITY_LEVEL "securityLevel"
+#define DMAPI5_RUNTIME_INFORMATION_VISIBILITY "visibility"
 
 #define DMAPI5_CHAT_UPDATE_CHANNELS "channels"
 
@@ -79,6 +82,8 @@
 #define DMAPI5_TOPIC_COMMAND_WATCHDOG_REATTACH 8
 #define DMAPI5_TOPIC_COMMAND_SEND_CHUNK 9
 #define DMAPI5_TOPIC_COMMAND_RECEIVE_CHUNK 10
+#define DMAPI5_TOPIC_COMMAND_RECEIVE_BROADCAST 11
+#define DMAPI5_TOPIC_COMMAND_COMPLETE_EVENT 12
 
 #define DMAPI5_TOPIC_PARAMETER_COMMAND_TYPE "commandType"
 #define DMAPI5_TOPIC_PARAMETER_CHAT_COMMAND "chatCommand"
@@ -88,7 +93,9 @@
 #define DMAPI5_TOPIC_PARAMETER_NEW_INSTANCE_NAME "newInstanceName"
 #define DMAPI5_TOPIC_PARAMETER_CHAT_UPDATE "chatUpdate"
 #define DMAPI5_TOPIC_PARAMETER_NEW_SERVER_VERSION "newServerVersion"
+#define DMAPI5_TOPIC_PARAMETER_BROADCAST_MESSAGE "broadcastMessage"
 
+#define DMAPI5_TOPIC_RESPONSE_CLIENT_COUNT "clientCount"
 #define DMAPI5_TOPIC_RESPONSE_COMMAND_RESPONSE "commandResponse"
 #define DMAPI5_TOPIC_RESPONSE_COMMAND_RESPONSE_MESSAGE "commandResponseMessage"
 #define DMAPI5_TOPIC_RESPONSE_CHAT_RESPONSES "chatResponses"
@@ -113,3 +120,9 @@
 #define DMAPI5_CUSTOM_CHAT_COMMAND_NAME "name"
 #define DMAPI5_CUSTOM_CHAT_COMMAND_HELP_TEXT "helpText"
 #define DMAPI5_CUSTOM_CHAT_COMMAND_ADMIN_ONLY "adminOnly"
+
+#define DMAPI5_EVENT_ID "eventId"
+
+#define DMAPI5_EVENT_INVOCATION_NAME "eventName"
+#define DMAPI5_EVENT_INVOCATION_PARAMETERS "parameters"
+#define DMAPI5_EVENT_INVOCATION_NOTIFY_COMPLETION "notifyCompletion"
diff --git a/code/modules/tgs/v5/api.dm b/code/modules/tgs/v5/api.dm
index 34cc43f8762f..3e328fc7c27d 100644
--- a/code/modules/tgs/v5/api.dm
+++ b/code/modules/tgs/v5/api.dm
@@ -4,11 +4,16 @@
 
 	var/instance_name
 	var/security_level
+	var/visibility
 
 	var/reboot_mode = TGS_REBOOT_MODE_NORMAL
 
+	/// List of chat messages list()s that attempted to be sent during a topic call. To be bundled in the result of the call
 	var/list/intercepted_message_queue
 
+	/// List of chat messages list()s that attempted to be sent during a topic call. To be bundled in the result of the call
+	var/list/offline_message_queue
+
 	var/list/custom_commands
 
 	var/list/test_merges
@@ -16,15 +21,23 @@
 	var/list/chat_channels
 
 	var/initialized = FALSE
+	var/initial_bridge_request_received = FALSE
+	var/datum/tgs_version/interop_version
 
 	var/chunked_requests = 0
 	var/list/chunked_topics = list()
 
+	var/list/pending_events = list()
+
 	var/detached = FALSE
 
-/datum/tgs_api/v5/New()
+	var/datum/tgs_http_handler/http_handler
+
+/datum/tgs_api/v5/New(datum/tgs_event_handler/event_handler, datum/tgs_version/version, datum/tgs_http_handler/http_handler)
 	. = ..()
-	TGS_DEBUG_LOG("V5 API created")
+	interop_version = version
+	src.http_handler = http_handler
+	TGS_DEBUG_LOG("V5 API created: [json_encode(args)]")
 
 /datum/tgs_api/v5/ApiVersion()
 	return new /datum/tgs_version(
@@ -37,8 +50,14 @@
 	access_identifier = world.params[DMAPI5_PARAM_ACCESS_IDENTIFIER]
 
 	var/datum/tgs_version/api_version = ApiVersion()
-	version = null
-	var/list/bridge_response = Bridge(DMAPI5_BRIDGE_COMMAND_STARTUP, list(DMAPI5_BRIDGE_PARAMETER_MINIMUM_SECURITY_LEVEL = minimum_required_security_level, DMAPI5_BRIDGE_PARAMETER_VERSION = api_version.raw_parameter, DMAPI5_PARAMETER_CUSTOM_COMMANDS = ListCustomCommands()))
+	version = null // we want this to be the TGS version, not the interop version
+
+	// sleep once to prevent an issue where world.Export on the first tick can hang indefinitely
+	TGS_DEBUG_LOG("Starting Export bug prevention sleep tick. time:[world.time] sleep_offline:[world.sleep_offline]")
+	sleep(world.tick_lag)
+	TGS_DEBUG_LOG("Export bug prevention sleep complete")
+
+	var/list/bridge_response = Bridge(DMAPI5_BRIDGE_COMMAND_STARTUP, list(DMAPI5_BRIDGE_PARAMETER_MINIMUM_SECURITY_LEVEL = minimum_required_security_level, DMAPI5_BRIDGE_PARAMETER_VERSION = api_version.raw_parameter, DMAPI5_PARAMETER_CUSTOM_COMMANDS = ListCustomCommands(), DMAPI5_PARAMETER_TOPIC_PORT = GetTopicPort()))
 	if(!istype(bridge_response))
 		TGS_ERROR_LOG("Failed initial bridge request!")
 		return FALSE
@@ -50,10 +69,12 @@
 
 	if(runtime_information[DMAPI5_RUNTIME_INFORMATION_API_VALIDATE_ONLY])
 		TGS_INFO_LOG("DMAPI validation, exiting...")
-		del(world)
+		TerminateWorld()
 
-	version = new /datum/tgs_version(runtime_information[DMAPI5_RUNTIME_INFORMATION_SERVER_VERSION])
+	initial_bridge_request_received = TRUE
+	version = new /datum/tgs_version(runtime_information[DMAPI5_RUNTIME_INFORMATION_SERVER_VERSION]) // reassigning this because it can change if TGS updates
 	security_level = runtime_information[DMAPI5_RUNTIME_INFORMATION_SECURITY_LEVEL]
+	visibility = runtime_information[DMAPI5_RUNTIME_INFORMATION_VISIBILITY]
 	instance_name = runtime_information[DMAPI5_RUNTIME_INFORMATION_INSTANCE_NAME]
 
 	var/list/revisionData = runtime_information[DMAPI5_RUNTIME_INFORMATION_REVISION]
@@ -100,15 +121,22 @@
 	initialized = TRUE
 	return TRUE
 
+/datum/tgs_api/v5/proc/GetTopicPort()
+#if defined(OPENDREAM) && defined(OPENDREAM_TOPIC_PORT_EXISTS)
+	return "[world.opendream_topic_port]"
+#else
+	return null
+#endif
+
 /datum/tgs_api/v5/proc/RequireInitialBridgeResponse()
 	TGS_DEBUG_LOG("RequireInitialBridgeResponse()")
 	var/logged = FALSE
-	while(!version)
+	while(!initial_bridge_request_received)
 		if(!logged)
 			TGS_DEBUG_LOG("RequireInitialBridgeResponse: Starting sleep")
 			logged = TRUE
 
-		sleep(1)
+		sleep(world.tick_lag)
 
 	TGS_DEBUG_LOG("RequireInitialBridgeResponse: Passed")
 
@@ -181,17 +209,7 @@
 		var/datum/tgs_chat_channel/channel = I
 		ids += channel.id
 
-	message2 = UpgradeDeprecatedChatMessage(message2)
-
-	if (!length(channels))
-		return
-
-	var/list/data = message2._interop_serialize()
-	data[DMAPI5_CHAT_MESSAGE_CHANNEL_IDS] = ids
-	if(intercepted_message_queue)
-		intercepted_message_queue += list(data)
-	else
-		Bridge(DMAPI5_BRIDGE_COMMAND_CHAT_SEND, list(DMAPI5_BRIDGE_PARAMETER_CHAT_MESSAGE = data))
+	SendChatMessageRaw(message2, ids)
 
 /datum/tgs_api/v5/ChatTargetedBroadcast(datum/tgs_message_content/message2, admin_only)
 	var/list/channels = list()
@@ -200,32 +218,82 @@
 		if (!channel.is_private_channel && ((channel.is_admin_channel && admin_only) || (!channel.is_admin_channel && !admin_only)))
 			channels += channel.id
 
+	SendChatMessageRaw(message2, channels)
+
+/datum/tgs_api/v5/ChatPrivateMessage(datum/tgs_message_content/message2, datum/tgs_chat_user/user)
+	SendChatMessageRaw(message2, list(user.channel.id))
+
+/datum/tgs_api/v5/proc/SendChatMessageRaw(datum/tgs_message_content/message2, list/channel_ids)
 	message2 = UpgradeDeprecatedChatMessage(message2)
 
-	if (!length(channels))
+	if (!length(channel_ids))
 		return
 
 	var/list/data = message2._interop_serialize()
-	data[DMAPI5_CHAT_MESSAGE_CHANNEL_IDS] = channels
+	data[DMAPI5_CHAT_MESSAGE_CHANNEL_IDS] = channel_ids
 	if(intercepted_message_queue)
 		intercepted_message_queue += list(data)
-	else
-		Bridge(DMAPI5_BRIDGE_COMMAND_CHAT_SEND, list(DMAPI5_BRIDGE_PARAMETER_CHAT_MESSAGE = data))
+		return
 
-/datum/tgs_api/v5/ChatPrivateMessage(datum/tgs_message_content/message2, datum/tgs_chat_user/user)
-	message2 = UpgradeDeprecatedChatMessage(message2)
-	var/list/data = message2._interop_serialize()
-	data[DMAPI5_CHAT_MESSAGE_CHANNEL_IDS] = list(user.channel.id)
-	if(intercepted_message_queue)
-		intercepted_message_queue += list(data)
+	if(offline_message_queue)
+		offline_message_queue += list(data)
+		return
+
+	if(detached)
+		offline_message_queue = list(data)
+
+		WaitForReattach(FALSE)
+
+		data = offline_message_queue
+		offline_message_queue = null
+
+		for(var/queued_message in data)
+			SendChatDataRaw(queued_message)
 	else
-		Bridge(DMAPI5_BRIDGE_COMMAND_CHAT_SEND, list(DMAPI5_BRIDGE_PARAMETER_CHAT_MESSAGE = data))
+		SendChatDataRaw(data)
+
+/datum/tgs_api/v5/proc/SendChatDataRaw(list/data)
+	Bridge(DMAPI5_BRIDGE_COMMAND_CHAT_SEND, list(DMAPI5_BRIDGE_PARAMETER_CHAT_MESSAGE = data))
 
 /datum/tgs_api/v5/ChatChannelInfo()
 	RequireInitialBridgeResponse()
 	WaitForReattach(TRUE)
 	return chat_channels.Copy()
 
+/datum/tgs_api/v5/TriggerEvent(event_name, list/parameters, wait_for_completion)
+	RequireInitialBridgeResponse()
+	WaitForReattach(TRUE)
+
+	if(interop_version.minor < 9)
+		TGS_WARNING_LOG("Interop version too low for custom events!")
+		return FALSE
+
+	var/str_parameters = list()
+	for(var/i in parameters)
+		str_parameters += "[i]"
+
+	var/list/response = Bridge(DMAPI5_BRIDGE_COMMAND_EVENT, list(DMAPI5_BRIDGE_PARAMETER_EVENT_INVOCATION = list(DMAPI5_EVENT_INVOCATION_NAME = event_name, DMAPI5_EVENT_INVOCATION_PARAMETERS = str_parameters, DMAPI5_EVENT_INVOCATION_NOTIFY_COMPLETION = wait_for_completion)))
+	if(!response)
+		return FALSE
+
+	var/event_id = response[DMAPI5_EVENT_ID]
+	if(!event_id)
+		return FALSE
+
+	TGS_DEBUG_LOG("Created event ID: [event_id]")
+	if(!wait_for_completion)
+		return TRUE
+
+	TGS_DEBUG_LOG("Waiting for completion of event ID: [event_id]")
+
+	while(!pending_events[event_id])
+		sleep(world.tick_lag)
+
+	TGS_DEBUG_LOG("Completed wait on event ID: [event_id]")
+	pending_events -= event_id
+
+	return TRUE
+
 /datum/tgs_api/v5/proc/DecodeChannels(chat_update_json)
 	TGS_DEBUG_LOG("DecodeChannels()")
 	var/list/chat_channels_json = chat_update_json[DMAPI5_CHAT_UPDATE_CHANNELS]
@@ -252,3 +320,7 @@
 /datum/tgs_api/v5/SecurityLevel()
 	RequireInitialBridgeResponse()
 	return security_level
+
+/datum/tgs_api/v5/Visibility()
+	RequireInitialBridgeResponse()
+	return visibility
diff --git a/code/modules/tgs/v5/bridge.dm b/code/modules/tgs/v5/bridge.dm
index 37f58bcdf632..62201fcc9e58 100644
--- a/code/modules/tgs/v5/bridge.dm
+++ b/code/modules/tgs/v5/bridge.dm
@@ -48,7 +48,9 @@
 	var/json = CreateBridgeData(command, data, TRUE)
 	var/encoded_json = url_encode(json)
 
-	var/url = "http://127.0.0.1:[server_port]/Bridge?[DMAPI5_BRIDGE_DATA]=[encoded_json]"
+	var/api_prefix = interop_version.minor >= 8 ? "api/" : ""
+
+	var/url = "http://127.0.0.1:[server_port]/[api_prefix]Bridge?[DMAPI5_BRIDGE_DATA]=[encoded_json]"
 	return url
 
 /datum/tgs_api/v5/proc/CreateBridgeData(command, list/data, needs_auth)
@@ -63,7 +65,7 @@
 	if(detached)
 		// Wait up to one minute
 		for(var/i in 1 to 600)
-			sleep(1)
+			sleep(world.tick_lag)
 			if(!detached && (!require_channels || length(chat_channels)))
 				break
 
@@ -75,20 +77,25 @@
 /datum/tgs_api/v5/proc/PerformBridgeRequest(bridge_request)
 	WaitForReattach(FALSE)
 
-	// This is an infinite sleep until we get a response
-	var/export_response = world.Export(bridge_request)
-	if(!export_response)
-		TGS_ERROR_LOG("Failed bridge request: [bridge_request]")
+	TGS_DEBUG_LOG("Bridge request start")
+	var/datum/tgs_http_result/result = http_handler.PerformGet(bridge_request)
+	TGS_DEBUG_LOG("Bridge request complete")
+
+	if(isnull(result))
+		TGS_ERROR_LOG("Failed bridge request, handler returned null!")
+		return
+
+	if(!istype(result) || result.type != /datum/tgs_http_result)
+		TGS_ERROR_LOG("Failed bridge request, handler returned non-[/datum/tgs_http_result]!")
 		return
 
-	var/response_json = file2text(export_response["CONTENT"])
-	if(!response_json)
-		TGS_ERROR_LOG("Failed bridge request, missing content!")
+	if(!result.success)
+		TGS_DEBUG_LOG("Failed bridge request, HTTP request failed!")
 		return
 
-	var/list/bridge_response = json_decode(response_json)
+	var/list/bridge_response = json_decode(result.response_text)
 	if(!bridge_response)
-		TGS_ERROR_LOG("Failed bridge request, bad json: [response_json]")
+		TGS_ERROR_LOG("Failed bridge request, bad json: [result.response_text]")
 		return
 
 	var/error = bridge_response[DMAPI5_RESPONSE_ERROR_MESSAGE]
diff --git a/code/modules/tgs/v5/topic.dm b/code/modules/tgs/v5/topic.dm
index d7d471213813..59e5e63e5cd4 100644
--- a/code/modules/tgs/v5/topic.dm
+++ b/code/modules/tgs/v5/topic.dm
@@ -94,7 +94,7 @@
 		if(DMAPI5_TOPIC_COMMAND_CHANGE_PORT)
 			var/new_port = topic_parameters[DMAPI5_TOPIC_PARAMETER_NEW_PORT]
 			if (!isnum(new_port) || !(new_port > 0))
-				return TopicResponse("Invalid or missing [DMAPI5_TOPIC_PARAMETER_NEW_PORT]]")
+				return TopicResponse("Invalid or missing [DMAPI5_TOPIC_PARAMETER_NEW_PORT]")
 
 			if(event_handler != null)
 				event_handler.HandleEvent(TGS_EVENT_PORT_SWAP, new_port)
@@ -141,7 +141,7 @@
 		if(DMAPI5_TOPIC_COMMAND_SERVER_PORT_UPDATE)
 			var/new_port = topic_parameters[DMAPI5_TOPIC_PARAMETER_NEW_PORT]
 			if (!isnum(new_port) || !(new_port > 0))
-				return TopicResponse("Invalid or missing [DMAPI5_TOPIC_PARAMETER_NEW_PORT]]")
+				return TopicResponse("Invalid or missing [DMAPI5_TOPIC_PARAMETER_NEW_PORT]")
 
 			server_port = new_port
 			return TopicResponse()
@@ -149,7 +149,9 @@
 		if(DMAPI5_TOPIC_COMMAND_HEALTHCHECK)
 			if(event_handler && event_handler.receive_health_checks)
 				event_handler.HandleEvent(TGS_EVENT_HEALTH_CHECK)
-			return TopicResponse()
+			var/list/health_check_response = TopicResponse()
+			health_check_response[DMAPI5_TOPIC_RESPONSE_CLIENT_COUNT] = TGS_CLIENT_COUNT
+			return health_check_response;
 
 		if(DMAPI5_TOPIC_COMMAND_WATCHDOG_REATTACH)
 			detached = FALSE
@@ -157,7 +159,7 @@
 			var/error_message = null
 			if (new_port != null)
 				if (!isnum(new_port) || !(new_port > 0))
-					error_message = "Invalid [DMAPI5_TOPIC_PARAMETER_NEW_PORT]]"
+					error_message = "Invalid [DMAPI5_TOPIC_PARAMETER_NEW_PORT]"
 				else
 					server_port = new_port
 
@@ -165,7 +167,7 @@
 			if (!istext(new_version_string))
 				if(error_message != null)
 					error_message += ", "
-				error_message += "Invalid or missing [DMAPI5_TOPIC_PARAMETER_NEW_SERVER_VERSION]]"
+				error_message += "Invalid or missing [DMAPI5_TOPIC_PARAMETER_NEW_SERVER_VERSION]"
 			else
 				var/datum/tgs_version/new_version = new(new_version_string)
 				if (event_handler)
@@ -175,6 +177,11 @@
 
 			var/list/reattach_response = TopicResponse(error_message)
 			reattach_response[DMAPI5_PARAMETER_CUSTOM_COMMANDS] = ListCustomCommands()
+			reattach_response[DMAPI5_PARAMETER_TOPIC_PORT] = GetTopicPort()
+
+			for(var/eventId in pending_events)
+				pending_events[eventId] = TRUE
+
 			return reattach_response
 
 		if(DMAPI5_TOPIC_COMMAND_SEND_CHUNK)
@@ -267,4 +274,25 @@
 
 			return chunk_to_send
 
+		if(DMAPI5_TOPIC_COMMAND_RECEIVE_BROADCAST)
+			var/message = topic_parameters[DMAPI5_TOPIC_PARAMETER_BROADCAST_MESSAGE]
+			if (!istext(message))
+				return TopicResponse("Invalid or missing [DMAPI5_TOPIC_PARAMETER_BROADCAST_MESSAGE]")
+
+			TGS_WORLD_ANNOUNCE(message)
+			return TopicResponse()
+
+		if(DMAPI5_TOPIC_COMMAND_COMPLETE_EVENT)
+			var/event_id = topic_parameters[DMAPI5_EVENT_ID]
+			if (!istext(event_id))
+				return TopicResponse("Invalid or missing [DMAPI5_EVENT_ID]")
+
+			TGS_DEBUG_LOG("Completing event ID [event_id]...")
+			pending_events[event_id] = TRUE
+			return TopicResponse()
+
 	return TopicResponse("Unknown command: [command]")
+
+/datum/tgs_api/v5/proc/WorldBroadcast(message)
+	set waitfor = FALSE
+	TGS_WORLD_ANNOUNCE(message)
diff --git a/code/modules/tgs/v5/undefs.dm b/code/modules/tgs/v5/undefs.dm
index c679737dfc49..ca49e46cdffa 100644
--- a/code/modules/tgs/v5/undefs.dm
+++ b/code/modules/tgs/v5/undefs.dm
@@ -8,16 +8,17 @@
 #undef DMAPI5_TOPIC_REQUEST_LIMIT
 #undef DMAPI5_TOPIC_RESPONSE_LIMIT
 
-#undef DMAPI5_BRIDGE_COMMAND_PORT_UPDATE
 #undef DMAPI5_BRIDGE_COMMAND_STARTUP
 #undef DMAPI5_BRIDGE_COMMAND_PRIME
 #undef DMAPI5_BRIDGE_COMMAND_REBOOT
 #undef DMAPI5_BRIDGE_COMMAND_KILL
 #undef DMAPI5_BRIDGE_COMMAND_CHAT_SEND
 #undef DMAPI5_BRIDGE_COMMAND_CHUNK
+#undef DMAPI5_BRIDGE_COMMAND_EVENT
 
 #undef DMAPI5_PARAMETER_ACCESS_IDENTIFIER
 #undef DMAPI5_PARAMETER_CUSTOM_COMMANDS
+#undef DMAPI5_PARAMETER_TOPIC_PORT
 
 #undef DMAPI5_CHUNK
 #undef DMAPI5_CHUNK_PAYLOAD
@@ -34,6 +35,7 @@
 #undef DMAPI5_BRIDGE_PARAMETER_VERSION
 #undef DMAPI5_BRIDGE_PARAMETER_CHAT_MESSAGE
 #undef DMAPI5_BRIDGE_PARAMETER_MINIMUM_SECURITY_LEVEL
+#undef DMAPI5_BRIDGE_PARAMETER_EVENT_INVOCATION
 
 #undef DMAPI5_BRIDGE_RESPONSE_NEW_PORT
 #undef DMAPI5_BRIDGE_RESPONSE_RUNTIME_INFORMATION
@@ -48,6 +50,7 @@
 #undef DMAPI5_RUNTIME_INFORMATION_REVISION
 #undef DMAPI5_RUNTIME_INFORMATION_TEST_MERGES
 #undef DMAPI5_RUNTIME_INFORMATION_SECURITY_LEVEL
+#undef DMAPI5_RUNTIME_INFORMATION_VISIBILITY
 
 #undef DMAPI5_CHAT_UPDATE_CHANNELS
 
@@ -77,6 +80,10 @@
 #undef DMAPI5_TOPIC_COMMAND_SERVER_PORT_UPDATE
 #undef DMAPI5_TOPIC_COMMAND_HEALTHCHECK
 #undef DMAPI5_TOPIC_COMMAND_WATCHDOG_REATTACH
+#undef DMAPI5_TOPIC_COMMAND_SEND_CHUNK
+#undef DMAPI5_TOPIC_COMMAND_RECEIVE_CHUNK
+#undef DMAPI5_TOPIC_COMMAND_RECEIVE_BROADCAST
+#undef DMAPI5_TOPIC_COMMAND_COMPLETE_EVENT
 
 #undef DMAPI5_TOPIC_PARAMETER_COMMAND_TYPE
 #undef DMAPI5_TOPIC_PARAMETER_CHAT_COMMAND
@@ -86,7 +93,9 @@
 #undef DMAPI5_TOPIC_PARAMETER_NEW_INSTANCE_NAME
 #undef DMAPI5_TOPIC_PARAMETER_CHAT_UPDATE
 #undef DMAPI5_TOPIC_PARAMETER_NEW_SERVER_VERSION
+#undef DMAPI5_TOPIC_PARAMETER_BROADCAST_MESSAGE
 
+#undef DMAPI5_TOPIC_RESPONSE_CLIENT_COUNT
 #undef DMAPI5_TOPIC_RESPONSE_COMMAND_RESPONSE
 #undef DMAPI5_TOPIC_RESPONSE_COMMAND_RESPONSE_MESSAGE
 #undef DMAPI5_TOPIC_RESPONSE_CHAT_RESPONSES
@@ -111,3 +120,9 @@
 #undef DMAPI5_CUSTOM_CHAT_COMMAND_NAME
 #undef DMAPI5_CUSTOM_CHAT_COMMAND_HELP_TEXT
 #undef DMAPI5_CUSTOM_CHAT_COMMAND_ADMIN_ONLY
+
+#undef DMAPI5_EVENT_ID
+
+#undef DMAPI5_EVENT_INVOCATION_NAME
+#undef DMAPI5_EVENT_INVOCATION_PARAMETERS
+#undef DMAPI5_EVENT_INVOCATION_NOTIFY_COMPLETION