diff --git a/addon_examples/deformer_helper.py b/addon_examples/deformer_helper.py
index 1d225ae..b2456bc 100644
--- a/addon_examples/deformer_helper.py
+++ b/addon_examples/deformer_helper.py
@@ -152,7 +152,7 @@ class DeformerAddon(BaseAddon):
         local_anim.LocalAnimAddon.apply_local_anim(session, region, "deformer_addon", anim_data)
 
     def handle_rlv_command(self, session: Session, region: ProxiedRegion, source: UUID,
-                           cmd: str, options: List[str], param: str):
+                           behaviour: str, options: List[str], param: str):
         # An object in-world can also tell the client how to deform itself via
         # RLV-style commands.
 
@@ -160,9 +160,9 @@ class DeformerAddon(BaseAddon):
         if param != "force":
             return
 
-        if cmd == "stop_deforming":
+        if behaviour == "stop_deforming":
             self.deform_joints.clear()
-        elif cmd == "deform_joints":
+        elif behaviour == "deform_joints":
             self.deform_joints.clear()
             for joint_data in options:
                 joint_split = joint_data.split("|")
diff --git a/addon_examples/local_anim.py b/addon_examples/local_anim.py
index 06824b3..4c90c25 100644
--- a/addon_examples/local_anim.py
+++ b/addon_examples/local_anim.py
@@ -114,15 +114,15 @@ class LocalAnimAddon(BaseAddon):
             await asyncio.sleep(1.0)
 
     def handle_rlv_command(self, session: Session, region: ProxiedRegion, source: UUID,
-                           cmd: str, options: List[str], param: str):
+                           behaviour: str, options: List[str], param: str):
         # We only handle commands
         if param != "force":
             return
 
-        if cmd == "stop_local_anim":
+        if behaviour == "stop_local_anim":
             self.apply_local_anim(session, region, options[0], new_data=None)
             return True
-        elif cmd == "start_local_anim":
+        elif behaviour == "start_local_anim":
             self.apply_local_anim_from_file(session, region, options[0])
             return True
 
diff --git a/hippolyzer/lib/client/rlv.py b/hippolyzer/lib/client/rlv.py
new file mode 100644
index 0000000..c91c94e
--- /dev/null
+++ b/hippolyzer/lib/client/rlv.py
@@ -0,0 +1,51 @@
+from typing import NamedTuple, List, Sequence
+
+from hippolyzer.lib.base.message.message import Message
+from hippolyzer.lib.base.templates import ChatType
+
+
+class RLVCommand(NamedTuple):
+    behaviour: str
+    param: str
+    options: List[str]
+
+
+class RLVParser:
+    @staticmethod
+    def is_rlv_message(msg: Message) -> bool:
+        chat: str = msg["ChatData"]["Message"]
+        chat_type: int = msg["ChatData"]["ChatType"]
+        return chat and chat.startswith("@") and chat_type == ChatType.OWNER
+
+    @staticmethod
+    def parse_chat(chat: str) -> List[RLVCommand]:
+        assert chat.startswith("@")
+        chat = chat.lstrip("@")
+        commands = []
+        for command_str in chat.split(","):
+            if not command_str:
+                continue
+            # RLV-style command, `<cmd>(:<option1>;<option2>)?(=<param>)?`
+            # Roughly (?<behaviour>[^:=]+)(:(?<option>[^=]*))?=(?<param>\w+)
+            options, _, param = command_str.partition("=")
+            behaviour, _, options = options.partition(":")
+            # TODO: Not always correct, commands can specify their own parsing for the option field
+            #  maybe special-case these?
+            options = options.split(";") if options else []
+            commands.append(RLVCommand(behaviour, param, options))
+        return commands
+
+    @staticmethod
+    def format_chat(commands: Sequence[RLVCommand]) -> str:
+        assert commands
+        chat = ""
+        for command in commands:
+            if chat:
+                chat += ","
+
+            chat += command.behaviour
+            if command.options:
+                chat += ":" + ";".join(command.options)
+            if command.param:
+                chat += "=" + command.param
+        return "@" + chat
diff --git a/hippolyzer/lib/proxy/addon_utils.py b/hippolyzer/lib/proxy/addon_utils.py
index b5503ac..c0f669b 100644
--- a/hippolyzer/lib/proxy/addon_utils.py
+++ b/hippolyzer/lib/proxy/addon_utils.py
@@ -188,7 +188,7 @@ class BaseAddon(metaclass=MetaBaseAddon):
         pass
 
     def handle_rlv_command(self, session: Session, region: ProxiedRegion, source: UUID,
-                           cmd: str, options: List[str], param: str):
+                           behaviour: str, options: List[str], param: str):
         pass
 
     def handle_proxied_packet(self, session_manager: SessionManager, packet: UDPPacket,
diff --git a/hippolyzer/lib/proxy/addons.py b/hippolyzer/lib/proxy/addons.py
index a1e92ae..4ea1a34 100644
--- a/hippolyzer/lib/proxy/addons.py
+++ b/hippolyzer/lib/proxy/addons.py
@@ -21,6 +21,7 @@ from hippolyzer.lib.base.datatypes import UUID
 from hippolyzer.lib.base.helpers import get_mtime
 from hippolyzer.lib.base.message.message import Message
 from hippolyzer.lib.base.network.transport import UDPPacket
+from hippolyzer.lib.client.rlv import RLVParser
 from hippolyzer.lib.proxy import addon_ctx
 from hippolyzer.lib.proxy.task_scheduler import TaskLifeScope, TaskScheduler
 
@@ -348,7 +349,7 @@ class AddonManager:
             cls.SCHEDULER.kill_matching_tasks(lifetime_mask=TaskLifeScope.ADDON, creator=addon)
 
     @classmethod
-    def _call_all_addon_hooks(cls, hook_name, *args, call_async=False, **kwargs):
+    def _call_all_addon_hooks(cls, hook_name, *args, call_async=False, **kwargs) -> Optional[bool]:
         for module in cls.FRESH_ADDON_MODULES.values():
             if not module:
                 continue
@@ -391,7 +392,7 @@ class AddonManager:
         return cls._try_call_hook(module, hook_name, *args, call_async=call_async, **kwargs)
 
     @classmethod
-    def _try_call_hook(cls, addon, hook_name, *args, call_async=False, **kwargs):
+    def _try_call_hook(cls, addon, hook_name, *args, call_async=False, **kwargs) -> Optional[bool]:
         if cls._SUBPROCESS:
             return
 
@@ -452,32 +453,30 @@ class AddonManager:
                             raise
                     return True
         if message.name == "ChatFromSimulator" and "ChatData" in message:
-            chat: str = message["ChatData"]["Message"]
-            chat_type: int = message["ChatData"]["ChatType"]
             # RLV-style OwnerSay?
-            if chat and chat.startswith("@") and chat_type == 8:
+            if RLVParser.is_rlv_message(message):
                 # RLV allows putting multiple commands into one message, blindly splitting on ",".
-                chat = chat.lstrip("@")
                 all_cmds_handled = True
-                for command_str in chat.split(","):
-                    if not command_str:
-                        continue
-                    # RLV-style command, `@<cmd>(:<option1>;<option2>)?(=<param>)?`
-                    options, _, param = command_str.partition("=")
-                    cmd, _, options = options.partition(":")
-                    # TODO: Not always correct, commands can specify their own parsing for the option field
-                    options = options.split(";") if options else []
-                    source = message["ChatData"]["SourceID"]
+                chat: str = message["ChatData"]["Message"]
+                source = message["ChatData"]["SourceID"]
+                for command in RLVParser.parse_chat(chat):
                     try:
                         with addon_ctx.push(session, region):
-                            handled = cls._call_all_addon_hooks("handle_rlv_command",
-                                                                session, region, source, cmd, options, param)
+                            handled = cls._call_all_addon_hooks(
+                                "handle_rlv_command",
+                                session,
+                                region,
+                                source,
+                                command.behaviour,
+                                command.options,
+                                command.param,
+                            )
                         if handled:
                             region.circuit.drop_message(message)
                         else:
                             all_cmds_handled = False
                     except:
-                        LOG.exception(f"Failed while handling command {command_str!r}")
+                        LOG.exception(f"Failed while handling command {command!r}")
                         all_cmds_handled = False
                         if not cls._SWALLOW_ADDON_EXCEPTIONS:
                             raise
diff --git a/tests/client/test_rlv.py b/tests/client/test_rlv.py
new file mode 100644
index 0000000..181b1fd
--- /dev/null
+++ b/tests/client/test_rlv.py
@@ -0,0 +1,36 @@
+import unittest
+
+from hippolyzer.lib.base.message.message import Message, Block
+from hippolyzer.lib.base.templates import ChatType
+from hippolyzer.lib.client.rlv import RLVParser, RLVCommand
+
+
+class TestRLV(unittest.TestCase):
+    def test_is_rlv_command(self):
+        msg = Message(
+            "ChatFromSimulator",
+            Block("ChatData", Message="@foobar", ChatType=ChatType.OWNER)
+        )
+        self.assertTrue(RLVParser.is_rlv_message(msg))
+        msg["ChatData"]["ChatType"] = ChatType.NORMAL
+        self.assertFalse(RLVParser.is_rlv_message(msg))
+
+    def test_rlv_parse_single_command(self):
+        cmd = RLVParser.parse_chat("@foo:bar;baz=quux")[0]
+        self.assertEqual("foo", cmd.behaviour)
+        self.assertListEqual(["bar", "baz"], cmd.options)
+        self.assertEqual("quux", cmd.param)
+
+    def test_rlv_parse_multiple_commands(self):
+        cmds = RLVParser.parse_chat("@foo:bar;baz=quux,bazzy")
+        self.assertEqual("foo", cmds[0].behaviour)
+        self.assertListEqual(["bar", "baz"], cmds[0].options)
+        self.assertEqual("quux", cmds[0].param)
+        self.assertEqual("bazzy", cmds[1].behaviour)
+
+    def test_rlv_format_commands(self):
+        chat = RLVParser.format_chat([
+            RLVCommand("foo", "quux", ["bar", "baz"]),
+            RLVCommand("bazzy", "", [])
+        ])
+        self.assertEqual("@foo:bar;baz=quux,bazzy", chat)