Server provides 7 tools with complete Zod schemas and descriptions in Indonesian. All tools are read-only and well-scoped to Accurate Online accounting data. Strengths: consistent naming (verb_noun pattern), all parameters typed with descriptions, error handling via errorResult() helper. Weaknesses: descriptions are functional but lack LLM-optimized guidance on WHEN to use each tool vs alternatives; no output schema documentation; parameter descriptions are minimal (avg ~40 chars, below 72-char baseline); no pagination guidance despite list_items and list_sales_invoices accepting page params; no error recovery hints (e.g., 'if token expired, re-run login').

• Document output schemas for all tools. E.g., list_items returns [{id: number, no: string, name: string, itemType: string, stock?: number}, ...]. Specify which fields are always present vs optional.
• Add format constraints to date parameters. Change 'Tanggal awal periode' to 'Start date (YYYY-MM-DD or DD/MM/YYYY format, default: Jan 1 of current year)'. Move format examples from tool description to parameter description.
• Add pagination guidance to list_* tools: 'Results are paginated. Each page contains up to 50 items. Use page parameter to fetch next page. Call this tool first to discover available items before calling get_item_detail.'
• Enhance error messages with recovery hints. In errorResult(), detect common failures (401 Unauthorized, 403 Forbidden) and append 'Hint: If token expired, run `bun run login` to refresh credentials.' or similar.
• Add WHEN-to-use guidance to report tool descriptions. E.g., profit_loss_report: 'Use this to answer questions about revenue, expenses, and net profit over a period. For cash position, use cash_flow_report instead.'