Build a multi-agent system that works with real files in Box — powered by the Claude Agent SDK. This video walks through a custom client where a team of Claude agents uses the Box CLI to explore, extract, create, and share documents stored in Box. Starting from a folder of W-2s, 1099s, and receipts, the agents produce a structured tax summary spreadsheet, upload it back to Box, and share it — all from a single high-level prompt. Each agent is simple: a system prompt, a set of tools, and access to Box through the CLI. The Plan Agent handles orchestration by turning a goal into a task board, while the user stays in control of what runs and when. What's covered: - How the Plan Agent breaks a goal into a task board with dependencies - How specialized agents (Explore, Extract, Excel) each handle a step - The architecture: skill-based prompts, streaming chat, and task cards in the UI - A full live run from prompt to shared spreadsheet Tech stack: - Anthropic Claude Agent SDK - Box CLI (@box/cli) - TanStack Start + React - Tailwind CSS + Radix UI - Python (openpyxl, pandas) for document creation Links: - GitHub: https://github.com/box-community/tax-with-box - Box Developer Account (free): https://account.box.com/signup/developer - Box CLI docs: https://developer.box.com/guides/cli

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