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A public, read-only collection of The Agent Builder newsletter: technical breakdowns, patterns, and real-world builds for Moveworks developers. New issues are added here. Subscribe to the newsletter to get future issues early. Subscribe to the newsletter to get it direct to your inbox here: aka.mw/newsletter

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Kevin Mok
Kevin MokCommunity Manager
published in Agent Builder Archive
Why File Slots Make Multipart APIs Feel NativeBlog

Welcome to the first issue of The Agent Builder — a lightweight update for the developers building agents. Editions will cover technical breakdowns, common patterns, actionable updates, and real builds. What are File Slots?Slots describe the inputs that your agent collects from a user to proceed with a task. File slots make it possible for your AI agents to collect files like expense receipts or invoice PDFs.File Slots help AI agents escape JSON to become Multipart.The core tension you may have come across: agent frameworks are JSON-first. LangChain, Semantic Kernel, even our old setup, everything flows through structured payloads. Files don't fit that model, so you rely on hacks:Base64-in-JSON: Bloats ~33%, longer transfers, memory spike on decode "Paste a link" strings:

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