Hi Ananya,

I've accomplished this task of automatically commenting in a work item when a build completes with the build results by using build engine participants written in Java.  https://jazz.net/jazz/web/projects/Jazz%20Collaborative%20ALM#action=com.ibm.team.workitem.viewWorkItem&id=240028 is one of our current track build items, and you can see comments from Mr. Build that were automatically added when a build completed.  I'm in the process of writing a blog post with a full description of how I accomplished this.  In the meantime, I'll give you a few pointers....

Build engine participants are pieces of code that can be run before, during, or after a build.  The code to be executed is installed as a plugin in the JBE, and the participant is applied to the Jazz build definition so the engine knows to execute the code.  The JBE takes care of notifying the participant that it should be run; all you have to do is write the code that should be executed at the given time in the build process.  There are four major steps to complete in order to use build engine participants:  writing the build engine participant, installing the build engine participant in the JBE, installing the build definition configuration element and editor extensions in the RTC Eclipse client, and applying the build engine participant to the build.

https://jazz.net/forum/questions/23182/creating-custom-pre-build-and-post-build-options has some sample code for a build engine participant.  https://jazz.net/wiki/bin/view/Main/ProgrammaticWorkItemCreation explains how to update work items programmatically.  https://jazz.net/wiki/bin/view/Main/BuildJavaProgrammingExamples has examples of how to work with the build api.  https://jazz.net/wiki/bin/view/Main/AutomaticWorkItemCommentingForBuilds has more information on the build engine participant I wrote.