diff --git a/amanuensis/lexicon/__init__.py b/amanuensis/lexicon/__init__.py
index 3eeefb2..909e71b 100644
--- a/amanuensis/lexicon/__init__.py
+++ b/amanuensis/lexicon/__init__.py
@@ -1,6 +1,11 @@
 from amanuensis.lexicon.admin import valid_name, create_lexicon
+from amanuensis.lexicon.setup import (
+	player_can_join_lexicon,
+	add_player_to_lexicon)
 
 __all__ = [member.__name__ for member in [
 	valid_name,
 	create_lexicon,
+	player_can_join_lexicon,
+	add_player_to_lexicon,
 ]]
diff --git a/amanuensis/lexicon/manage.py b/amanuensis/lexicon/manage.py
index b6144c9..65bbe46 100644
--- a/amanuensis/lexicon/manage.py
+++ b/amanuensis/lexicon/manage.py
@@ -68,53 +68,6 @@ def get_user_lexicons(user):
 		if user.in_lexicon(lexicon)]
 
 
-def valid_add(lex, player, password=None):
-	"""
-	Checks whether the given player can join a lexicon
-	"""
-	# Trivial failures
-	if lex is None:
-		return False
-	if player is None:
-		return False
-	# Can't join if already in the game
-	if player.id in lex.join.joined:
-		return False
-	# Can't join if the game is closed
-	if not lex.join.open:
-		return False
-	# Can't join if the player max is reached
-	if len(lex.join.joined) >= lex.join.max_players:
-		return False
-	# Can't join if the password doesn't check out
-	if lex.join.password is not None and lex.join.password != password:
-		return False
-
-	return True
-
-
-def add_player(lex, player):
-	"""
-	Unconditionally adds a player to a lexicon
-	"""
-	# Verify arguments
-	if lex is None:
-		raise ArgumentError("Invalid lexicon: '{}'".format(lex))
-	if player is None:
-		raise ArgumentError("Invalid player: '{}'".format(player))
-
-	# Idempotently add player
-	added = False
-	with json_rw(lex.config_path) as cfg:
-		if player.id not in cfg.join.joined:
-			cfg.join.joined.append(player.id)
-			added = True
-
-	# Log to the lexicon's log
-	if added:
-		lex.add_log("Player '{0.username}' joined ({0.id})".format(player))
-
-
 def remove_player(lex, player):
 	"""
 	Remove a player from a lexicon
diff --git a/amanuensis/lexicon/setup.py b/amanuensis/lexicon/setup.py
index 25bb13e..f7e4174 100644
--- a/amanuensis/lexicon/setup.py
+++ b/amanuensis/lexicon/setup.py
@@ -2,3 +2,57 @@
 Submodule of functions for managing lexicon games during the setup and
 joining part of the game lifecycle.
 """
+from amanuensis.errors import ArgumentError
+from amanuensis.models import LexiconModel, UserModel
+
+
+def player_can_join_lexicon(
+	player: UserModel,
+	lexicon: LexiconModel,
+	password: str = None):
+	"""
+	Checks whether the given player can join a lexicon
+	"""
+	# Trivial failures
+	if lexicon is None:
+		return False
+	if player is None:
+		return False
+	# Can't join if already in the game
+	if player.uid in lexicon.cfg.join.joined:
+		return False
+	# Can't join if the game is closed
+	if not lexicon.cfg.join.open:
+		return False
+	# Can't join if there's no room left
+	if len(lexicon.cfg.join.joined) >= lexicon.cfg.join.max_players:
+		return False
+	# Can't join if the password doesn't check out
+	if (lexicon.cfg.join.password is not None
+		and lexicon.cfg.join.password != password):
+		return False
+	return True
+
+
+def add_player_to_lexicon(
+	player: UserModel,
+	lexicon: LexiconModel):
+	"""
+	Unconditionally adds a player to a lexicon
+	"""
+	# Verify arguments
+	if lexicon is None:
+		raise ArgumentError(f'Invalid lexicon: {lexicon}')
+	if player is None:
+		raise ArgumentError(f'Invalid player: {player}')
+
+	# Idempotently add player
+	added = False
+	with lexicon.ctx.edit_config() as cfg:
+		if player.uid not in cfg.join.joined:
+			cfg.join.joined.append(player.uid)
+			added = True
+
+	# Log to the lexicon's log
+	if added:
+		lexicon.log('Player "{0.cfg.username}" joined ({0.uid})'.format(player))