Engineering on blog.yfzhouhttps://blog.yfzhou.fyi/tags/engineering/Recent content in Engineering on blog.yfzhouHugo -- 0.140.2en-usMon, 18 May 2026 11:00:00 +0800What we learned building sandbox for document agenthttps://blog.yfzhou.fyi/posts/doc-sandbox/Mon, 18 May 2026 11:00:00 +0800https://blog.yfzhou.fyi/posts/doc-sandbox/<p><em>Cross-posted from the <a href="https://raycaster.ai/blog/sandbox-for-document-agent">Raycaster blog</a>; I&rsquo;ve spent the last several months building this, and here is my take.</em></p> <p>2025 brought us the new idiom for building AI (beginning with Manus and Claude Code): give it tools to operate a computer. This is a break from the past default approach represented by ChatGPT, which is LLM + a menu of bespoke API connections to plug in to various systems of record.</p> <p>Our first attempt at a document agent was to ingest documents, parse them into plaintext pages, expose search/read/write tools, and let the LLM operate over virtual directories of artifacts and pages backed by a SQL database.</p>