diff --git a/client/tests/unit/test_dev_harness_seed_logs.gd b/client/tests/unit/test_dev_harness_seed_logs.gd
new file mode 100644
index 0000000..d8fb985
--- /dev/null
+++ b/client/tests/unit/test_dev_harness_seed_logs.gd
@@ -0,0 +1,25 @@
+extends "res://addons/gut/test.gd"
+## Guards the two dev-only proving-scene seed logs (narrate_harness,
+## npc_harness) against the same LogPlayer arg-slot regression the shell test
+## guards (see test_main_window_shell.gd). Both scenes build their seed log's
+## LogPlayer in _ready() with no network call until a button is pressed, so
+## instantiate + add_child_autofree is cheap and touches no network.
+
+const NARRATE_SCENE := "res://scenes/narrate_harness.tscn"
+const NPC_SCENE := "res://scenes/npc_harness.tscn"
+
+
+func test_narrate_harness_seed_log_has_real_race_and_calling():
+	var node = load(NARRATE_SCENE).instantiate()
+	add_child_autofree(node)
+	assert_true(Races.exists(node._log.player.race_id), "seed race must be a real race")
+	assert_true(Callings.exists(node._log.player.calling_id), "seed calling must be a real calling")
+	assert_ne(node._log.player.luck_descriptor, "", "the descriptor must not be lost to an arg-slot shift")
+
+
+func test_npc_harness_seed_log_has_real_race_and_calling():
+	var node = load(NPC_SCENE).instantiate()
+	add_child_autofree(node)
+	assert_true(Races.exists(node._canon_log.player.race_id), "seed race must be a real race")
+	assert_true(Callings.exists(node._canon_log.player.calling_id), "seed calling must be a real calling")
+	assert_ne(node._canon_log.player.luck_descriptor, "", "the descriptor must not be lost to an arg-slot shift")
diff --git a/client/tests/unit/test_dev_harness_seed_logs.gd.uid b/client/tests/unit/test_dev_harness_seed_logs.gd.uid
new file mode 100644
index 0000000..3adeb1a
--- /dev/null
+++ b/client/tests/unit/test_dev_harness_seed_logs.gd.uid
@@ -0,0 +1 @@
+uid://bmaooitlx0ox4
diff --git a/client/tests/unit/test_entities.gd b/client/tests/unit/test_entities.gd
index 1f0f643..77e6347 100644
--- a/client/tests/unit/test_entities.gd
+++ b/client/tests/unit/test_entities.gd
@@ -32,19 +32,6 @@ func test_log_player_rejects_a_dead_calling():
 	assert_true(p.set_race_id("dwarf"))
 
 
-func test_log_player_ctor_populates_both_race_and_calling():
-	# Regression: three call sites once passed the OLD 3-arg (name, class_id,
-	# luck_descriptor) shape against the NEW 4-arg (name, race_id, calling_id,
-	# luck_descriptor) constructor. Every param has a default, so GDScript
-	# compiled it silently — the string meant as a calling landed in the
-	# race_id slot, got rejected, and both fields came out "". This asserts
-	# a properly-shaped call yields BOTH fields non-empty.
-	var p := LogPlayer.new("Aldric", "human", "sellsword", "Fortune spits on you")
-	var d := p.to_dict()
-	assert_ne(d["race_id"], "", "race_id must not be empty")
-	assert_ne(d["calling_id"], "", "calling_id must not be empty")
-
-
 func test_log_player_ctor_rejects_calling_passed_as_race():
 	# The exact shape of the bug: calling three broken call sites used to pass —
 	# LogPlayer.new(name, class_id, luck_descriptor) against the NEW ctor
diff --git a/client/tests/unit/test_main_window_shell.gd b/client/tests/unit/test_main_window_shell.gd
index 44413ab..13527d6 100644
--- a/client/tests/unit/test_main_window_shell.gd
+++ b/client/tests/unit/test_main_window_shell.gd
@@ -35,3 +35,15 @@ func test_shell_builds_a_code_owned_seed_log():
 	var node := _shell()
 	assert_not_null(node._log, "a canon log exists to post (§11)")
 	assert_gt(node._log.established_facts.size(), 0, "seed scene facts are code-owned")
+
+
+func test_shell_seed_player_has_a_real_race_and_calling():
+	# Regression: the shell's _build_seed_log() once called LogPlayer.new() with
+	# the OLD 3-arg (name, class_id, luck_descriptor) shape against the NEW
+	# 4-arg ctor. Every param defaults, so it compiled silently and both
+	# race_id/calling_id came out "" — which 422s against the canon-log schema.
+	# Assert against the log the shell actually builds, not a fresh LogPlayer.
+	var node := _shell()
+	assert_true(Races.exists(node._log.player.race_id), "seed race must be a real race")
+	assert_true(Callings.exists(node._log.player.calling_id), "seed calling must be a real calling")
+	assert_ne(node._log.player.luck_descriptor, "", "the descriptor must not be lost to an arg-slot shift")