diff -r f3aafd785e65 -r 9dfbea54b680 mercurial/configitems.py
--- a/mercurial/configitems.py	Tue Jan 18 13:05:21 2022 -0800
+++ b/mercurial/configitems.py	Thu Mar 17 11:19:06 2022 -0700
@@ -1601,6 +1601,14 @@
     experimental=True,
 )
 coreconfigitem(
+    b'partial-merge-tools',
+    br'.*\.args',
+    default=b"$local $base $other",
+    generic=True,
+    priority=-1,
+    experimental=True,
+)
+coreconfigitem(
     b'merge-tools',
     b'.*',
     default=None,