Use when the user has raw material (English article, German article, brain dump in either language, transcript, mixed notes) and wants a German brief extracted from it as the planning artefact for a German article. Trigger on "analysiere quelle", "deutsche zusammenfassung", "brief auf deutsch", "extrahiere kern", or any explicit ask to prepare raw material for German long-form writing. Produces a German brief that schreibe-entwurf reads. Not for translation (the brief is in German but it is not a translation — it is an extraction).
