diff --git a/src/mudlib/commands/things.py b/src/mudlib/commands/things.py
index 6b3dbe8..7f6a2f0 100644
--- a/src/mudlib/commands/things.py
+++ b/src/mudlib/commands/things.py
@@ -49,7 +49,7 @@ async def cmd_get(player: Player, args: str) -> None:
         return
 
     if not player.can_accept(thing):
-        await player.send(f"You can't pick that up.\r\n")
+        await player.send("You can't pick that up.\r\n")
         return
 
     thing.move_to(player)
@@ -76,5 +76,21 @@ async def cmd_drop(player: Player, args: str) -> None:
     await player.send(f"You drop {thing.name}.\r\n")
 
 
+async def cmd_inventory(player: Player, args: str) -> None:
+    """List items in the player's inventory."""
+    things = [obj for obj in player.contents if isinstance(obj, Thing)]
+
+    if not things:
+        await player.send("You aren't carrying anything.\r\n")
+        return
+
+    lines = ["You are carrying:\r\n"]
+    for thing in things:
+        lines.append(f"  {thing.name}\r\n")
+
+    await player.send("".join(lines))
+
+
 register(CommandDefinition("get", cmd_get, aliases=["take", "pick"]))
 register(CommandDefinition("drop", cmd_drop))
+register(CommandDefinition("inventory", cmd_inventory, aliases=["i"]))
diff --git a/tests/test_inventory.py b/tests/test_inventory.py
new file mode 100644
index 0000000..fcce885
--- /dev/null
+++ b/tests/test_inventory.py
@@ -0,0 +1,105 @@
+"""Tests for inventory command."""
+
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+
+from mudlib import commands
+from mudlib.commands import things  # noqa: F401
+from mudlib.player import Player
+from mudlib.thing import Thing
+from mudlib.zone import Zone
+
+
+@pytest.fixture
+def test_zone():
+    """Create a test zone."""
+    return Zone(
+        name="testzone",
+        width=10,
+        height=10,
+        toroidal=True,
+        terrain=[["." for _ in range(10)] for _ in range(10)],
+    )
+
+
+@pytest.fixture
+def mock_writer():
+    """Create a mock writer."""
+    return MagicMock(write=MagicMock(), drain=AsyncMock())
+
+
+@pytest.fixture
+def mock_reader():
+    """Create a mock reader."""
+    return MagicMock()
+
+
+@pytest.fixture
+def player(mock_reader, mock_writer, test_zone):
+    """Create a test player."""
+    return Player(
+        name="TestPlayer",
+        x=5,
+        y=5,
+        reader=mock_reader,
+        writer=mock_writer,
+        location=test_zone,
+    )
+
+
+@pytest.mark.asyncio
+async def test_inventory_empty(player, mock_writer):
+    """Test inventory with no items."""
+    from mudlib.commands.things import cmd_inventory
+
+    await cmd_inventory(player, "")
+
+    output = mock_writer.write.call_args_list[-1][0][0]
+    assert "You aren't carrying anything." in output
+
+
+@pytest.mark.asyncio
+async def test_inventory_one_item(player, mock_writer):
+    """Test inventory with one item."""
+    from mudlib.commands.things import cmd_inventory
+
+    Thing(name="rock", location=player)
+
+    await cmd_inventory(player, "")
+
+    output = mock_writer.write.call_args_list[-1][0][0]
+    assert "You are carrying:" in output
+    assert "rock" in output
+
+
+@pytest.mark.asyncio
+async def test_inventory_multiple_items(player, mock_writer):
+    """Test inventory with multiple items."""
+    from mudlib.commands.things import cmd_inventory
+
+    Thing(name="rock", location=player)
+    Thing(name="sword", location=player)
+    Thing(name="shield", location=player)
+
+    await cmd_inventory(player, "")
+
+    output = mock_writer.write.call_args_list[-1][0][0]
+    assert "You are carrying:" in output
+    assert "rock" in output
+    assert "sword" in output
+    assert "shield" in output
+
+
+def test_inventory_command_registered():
+    """Test that inventory command is registered."""
+    assert "inventory" in commands._registry
+    cmd = commands._registry["inventory"]
+    assert cmd.name == "inventory"
+
+
+def test_inventory_alias_registered():
+    """Test that 'i' alias is registered."""
+    assert "i" in commands._registry
+    cmd = commands._registry["i"]
+    assert cmd.name == "inventory"