designIllustrationInWhiteboard

Create or refine a standalone ILLUSTRATION INSIDE an existing whiteboard by conversing with the AI design agent. This is the illustration sibling of designDeckInWhiteboard: same conversation, same follow-up flow, but it makes ONE on-brand illustration placed on the board (not a slide deck). Send a brief for a NEW illustration, a change to an existing one, or an answer to the agent's question. The agent generates the illustration, places it on the board, and if the brief is ambiguous it asks ONE clarifying question (answer with the same sessionId). Returns immediately; poll getDeckReplyInWhiteboard for the result. Use it when the user wants a picture they can talk about and refine turn by turn (e.g. 'draw a friendly robot onboarding a new team', then 'make it warmer', 'add a second robot'). For a quick one-shot illustration with no follow-up, use generateIllustrationInWhiteboard instead. WHITEBOARD IS REQUIRED: an illustration always lives inside a whiteboard, so documentId (the whiteboard's id) is required. If you do NOT already have a whiteboard id, ASK THE USER which whiteboard they want the illustration designed in — do NOT create a whiteboard automatically. Only call createWhiteboard first if the user explicitly asks for a brand-new board; otherwise use the id of the whiteboard they name. FIRST vs FOLLOW-UP: the first call (from nothing) builds; a follow-up call (an answer, a change, or a new instruction) passes the sessionId (or the deckId) plus the new message. COST + APPROVAL: a build costs 50 credits per 30 slides (1 to 30 slides is 50, 31 to 60 is 100, and so on, with the second and later blocks charged once the deck is built and never charged twice for the same block), an edit costs a flat 50, and a clarifying question is FREE. Call FIRST without confirm: it returns the exact cost, the workspace balance and a single-use quoteToken, and charges nothing. Show the cost to the user, and only if they agree call again with the same arguments plus confirm:true and that quoteToken (it works once, for 10 minutes; a changed request gets a fresh quote and nothing is charged). The fee is auto-refunded if a turn produces no change or fails. Returns sessionId (the conversation), deckId (the illustration's id), status, turnType, started, awaitingUser, needsConfirmation, insufficientCredits, on a quote also quote (cost and balance), quoteToken and howToConfirm, and assistantMessage.