Oxenstierna

/** * Utility functions for the Document Viewer */ import type { CallToolResult } from "@modelcontextprotocol/sdk/types.js"; import type { PageData, ThumbnailData } from "./types"; /** * Extract structuredContent from a CallToolResult. * callServerTool responses should include it, but guard with a fallback * that tries to parse the first text content block as JSON. */ function getStructured(result: CallToolResult): Record<string, unknown> | null { const sc = (result as any).structuredContent; if (sc && typeof sc === "object") return sc; // Fallback: try parsing first text block as JSON const text = result.content?.find((c) => c.type === "text"); if (text && "text" in text) { try { const parsed = JSON.parse(text.text); if (parsed && typeof parsed === "object") return parsed; } catch { // not JSON — ignore } } return null; } /** * Parse load_page tool result into a single PageData. */ export function parsePageResult(result: CallToolResult): PageData | null { const sc = getStructured(result); if (sc && "page" in sc) { return sc.page as PageData; } return null; } /** * Parse load_thumbnails tool result into ThumbnailData array. */ export function parseThumbnailResult(result: CallToolResult): ThumbnailData[] { const sc = getStructured(result); if (sc && "thumbnails" in sc) { return sc.thumbnails as ThumbnailData[]; } return []; }