This directory contains a number of small starlark files that can be used in bazel cquery invocations to extract information about the Bazel build graph. For example:
fx bazel cquery <config-options>
--output=starlark --starlark:file=/path/to/this/file \
//path/to:target
They are mostly an implementation detail of the bazel_gn_target_action.py and bazel_action_impl.py scripts. Their content may change arbitrarily to keep track of internal changes within the Bazel SDK rules.