The documentation for SMJobBless states that "[t]he helper tool must have an embedded launchd plist. The only required key in this plist is the Label key." This implies to us that other keys in the embedded launchd plist (except Program and ProgramArguments) will be respected. However, we find that the executable is copied into place, but only the Label of our embedded launchd plist (and the ProgramArguments generated by the API call) is written out to the /Library/LaunchDaemons/reverse-dns-label.helper.plist. We are further unable to get the SMJobBless API to upgrade the installed helper tool based on "Bundle version" version number in the __info_plist; we instead receive "(kSMErrorDomainFramework error -308 - Unknown error code: -308)" in the CFErrorRef. But if we manually remove the launchd job and delete the helper tool & plist files, SMJobBless succeeds, with the new launchd plist containing the same information as the previous, namely the Label and ProgramArguments, but nothing else from the embedded __launchd_plist section. Can anyone help explain these issues? Should we try a workaround of SMJobCopyDictionary / mutate dictionary / SMJobSubmit to get our other keys/values into the launchd plist? Thanks, RB