diff --git a/features/steps/tui_permissions_screen_steps.py b/features/steps/tui_permissions_screen_steps.py
index f6e4b9160..a9fa59515 100644
--- a/features/steps/tui_permissions_screen_steps.py
+++ b/features/steps/tui_permissions_screen_steps.py
@@ -65,13 +65,13 @@ def step_inspect_diff_display_mode(context):
     context._diff_display_mode = DiffDisplayMode
 
 
-@then('DiffDisplayMode should have values "unified", "side_by_side", "context"')
+@then('DiffDisplayMode should have values "unified", "split", "auto"')
 def step_diff_display_mode_values(context):
     from cleveragents.tui.permissions.models import DiffDisplayMode
 
     assert DiffDisplayMode.UNIFIED == "unified"
-    assert DiffDisplayMode.SIDE_BY_SIDE == "side_by_side"
-    assert DiffDisplayMode.CONTEXT == "context"
+    assert DiffDisplayMode.SPLIT == "split"
+    assert DiffDisplayMode.AUTO == "auto"
 
 
 # ---------------------------------------------------------------------------
@@ -165,13 +165,13 @@ def step_rendered_diff_empty(context):
     )
 
 
-@when("I call side_by_side_diff on the request")
+@when("I call split_diff on the request")
 def step_call_side_by_side_diff(context):
-    context._sbs_left, context._sbs_right = context._perm_request.side_by_side_diff()
+    context._sbs_left, context._sbs_right = context._perm_request.split_diff()
 
 
 @then("both sides should have the same number of lines")
-def step_sbs_same_length(context):
+def step_split_same_length(context):
     assert len(context._sbs_left) == len(context._sbs_right), (
         f"Left: {len(context._sbs_left)}, Right: {len(context._sbs_right)}"
     )
@@ -578,13 +578,13 @@ def step_create_insert_only_request(context):
 
 @then("the left side should have non-empty lines")
 def step_left_side_non_empty(context):
-    left, _ = context._perm_request.side_by_side_diff()
+    left, _ = context._perm_request.split_diff()
     assert any(line.strip() for line in left), f"Expected non-empty left lines: {left}"
 
 
 @then("the right side should have empty lines for deleted content")
 def step_right_side_empty_for_deleted(context):
-    _, right = context._perm_request.side_by_side_diff()
+    _, right = context._perm_request.split_diff()
     # For delete-only, right side should have empty strings
     assert any(line == "" for line in right), (
         f"Expected empty right lines for deleted content: {right}"
@@ -593,7 +593,7 @@ def step_right_side_empty_for_deleted(context):
 
 @then("the right side should have non-empty lines")
 def step_right_side_non_empty(context):
-    _, right = context._perm_request.side_by_side_diff()
+    _, right = context._perm_request.split_diff()
     assert any(line.strip() for line in right), (
         f"Expected non-empty right lines: {right}"
     )
@@ -601,7 +601,7 @@ def step_right_side_non_empty(context):
 
 @then("the left side should have empty lines for inserted content")
 def step_left_side_empty_for_inserted(context):
-    left, _ = context._perm_request.side_by_side_diff()
+    left, _ = context._perm_request.split_diff()
     # For insert-only, left side should have empty strings
     assert any(line == "" for line in left), (
         f"Expected empty left lines for inserted content: {left}"