Index: tools/tools/git/arc-patch
===================================================================
--- /dev/null
+++ tools/tools/git/arc-patch
@@ -0,0 +1,9 @@
+#!/bin/sh
+# Run arc patch and update the commit message afterwards to filter out
+# unneccessary phabricator tags.
+# Since the message probably still needs some editing afterwards, it also
+# runs git commit --amend to allow finalizing the message.
+scriptdir=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd -P)
+arc patch --nobranch --skip-dependencies "$@" && "$scriptdir"/arcfilter.sh
+git commit --amend
+
Index: tools/tools/git/arcfilter.sh
===================================================================
--- /dev/null
+++ tools/tools/git/arcfilter.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# Remove unnecessary phabricator tags from the commit at HEAD.
+# Based on the arcfilter.sh script from LLVM.
+git log -1 --pretty=%B | \
+  sed 's/^Summary://' | \
+  awk '/Reviewers:|Subscribers:/{p=1} /Reviewed By:|Differential Revision:/{p=0} !p && !/^Summary:$/ {sub(/^Summary: /,"");print}' | \
+  sed -e 's/^Reviewers: /Reviewers:\t/' \
+      -e 's/^Reviewed By: /Reviewed By:\t/' \
+      -e 's/^Reviewed by: /Reviewed by:\t/' | \
+  git commit --amend --date=now -F -