Getting last test names + duration on the agent

I would like to write my agent to access the tests of the last build.
The thing I would like to do is proving the agent a list with test names and duration. Can I use this:

I thought about using a ParametersPreprocessor and do it that way:

public void fixRunBuildParameters(@NotNull SRunningBuild runningBuild, @NotNull Map<String, String> runParameters, @NotNull Map<String, String> buildParameters) {
          SBuildType buildType = runningBuild.getBuildType();
          List<SFinishedBuild> lastBuilds = buildType.getHistory(null, true, false);

          ...

          _WriteListToFile(...);
          buildParameters.put(TEST_LIST_FILE, filePath);
}

Where will this extension be execeted, on the server or agent side?

Could I do the same in the agent plugin itself? Can the agent access the Build- Server that way?

Best Regards,

Oliver Klemencic