Call posts.create_pieces

Create every post a brief calls for, in one call — 'make this week's posts from Tuesday's episode', 'create three posts for the launch'. Each piece is created with whatever the request already settles — what it is built from, where it goes, its own copy, its time — and gets its board, so a complete request needs no further calls beyond each destination's version. Read posts.plan_context first so slot ids, library ids and destination names are real. It creates drafts only: nothing is published or sent for approval. Not for reading where one piece stands afterwards — that is posts.api_read_piece.

Every result names the workspace it ran in. Say which workspace the answer is about. When the account has more than one workspace and none is selected, this tool refuses with workspace_ambiguous and lists the choices — offer them, never pick one.