The pipelines.lsst.io build tool will coordinate builds of the pipelines.lsst.io Sphinx site. Its main functionality is:

• Symlink doc/ directories of packages into a pipelines.lsst.io clone
• Add configuration information (like the current tag, or if working on master, the branches and most recent tag)
• Run the Sphinx build

Some of this functionality is already coded in LTD Mason, however, it should be moved to https://github.com/lsst-sqre/documenteer, our core package for DM Sphinx projects. (I'm slowly breaking LTD Mason apart; I think having a single package that was both an LTD upload tool and a build tool was a wrong fit).