feat(agent-tars): make greeter response shorter

[ulivz]

Before

After

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 4.69%. Comparing base (ec61134) to head (d25622c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #210   +/-   ##
=====================================
  Coverage   4.69%   4.69%           
=====================================
  Files        253     253           
  Lines       7769    7769           
  Branches    1450    1450           
=====================================
  Hits         365     365           
  Misses      7364    7364           
  Partials      40      40           

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[WillemJiang]

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