fix: raise on placeholder prompt

[mtth]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.94%. Comparing base (0a42eb7) to head (eeb772d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #65   +/-   ##
=======================================
  Coverage   91.94%   91.94%           
=======================================
  Files           9        9           
  Lines         608      608           
  Branches       43       43           
=======================================
  Hits          559      559           
  Misses         32       32           
  Partials       17       17           

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