diff --git a/pkg/base-dev/lib/sink.hoon b/pkg/base-dev/lib/sink.hoon
new file mode 100644
index 0000000000..fe08349752
--- /dev/null
+++ b/pkg/base-dev/lib/sink.hoon
@@ -0,0 +1,26 @@
+/+  noun-diff
+|%
+++  clog
+  |$  [stut]
+  $%
+    [%flush stut]
+    [%drain patch:noun-diff]
+  ==
+++  sink
+  |*  pats=(list path)
+  |*  stat=*  
+  |@    
+  ++  sync 
+    |=  [stat=_stat]
+    ^-  [card:agent:gall _..sync]
+    =/  dif
+      %+  diff:noun-diff  ^stat  stat
+    :-
+    [%give %fact pats %noun !>(^-((clog) [%drain dif]))] 
+    ..sync(stat stat)
+  ++  paths  pats
+  ++  flush
+    ^-  card:agent:gall
+    [%give %fact pats %noun !>(^-((clog) [%flush (extract stat)]))]
+  --
+--
\ No newline at end of file