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+# Copyright (c) 2022 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+This directory contains tox scripts and other files they need.
+Generally, a tox script is either a checker (suitable for automated verify)
+or a fixer (manually started, risky as uncommitted edits can be lost).
+Each tox script is assumed to be run from tox,
+when working directory is set to ${CSIT_DIR}.
+
+Each checker script should:
++ Return nonzero exit code when it fails.
+++ The tox might ignore the code when the check is not blocking.
++ Write less verbose output to stderr.
++ Write (to stderr) PASSED or FAILED to help with debugging.
++ Direct more verbose output to appropriately named .log file.
++ Only the output suitable for automated processing by an external caller
+  should be written to stdout.
+++ The level of "less verbose" depends on check and state of codebase.
++ TODO: Should we carefully document which files are
+  whitelisted/blacklisted for a particulat check?
+
+Each fixer script should:
++ Perform edits on current filesystem
++ Not assume git is clean (there may be uncommitted edits).
++ Use "git diff HEAD~" to get both comitted and uncomitted edits to analyze.
++ Output whatever it wants (possibly nothing).
+
+TODO: Should checkers be named differently than fixers?
+      E.g. both scripts and tox environments start with fix_?