Commands C2
The Pivotal Tracker web client requests changes to the data on the server by creating and executing commands, rather than by performing POSTs or PUTs to the RESTy endpoints. And it keeps its local copy of project data up to date by receiving the stream of executed commands from the server. The commands executed by the server against the project's data (whatever the source) are also used as the basis of the activity data that can be retrieved via the different activity endpoints:
As the new Tracker API continues to roll out, each command and it's parameter signature will be documented here.