# Content Studio design agent

LangChain has published how it built Content Studio, its in-house design agent: the model could already write HTML, CSS and animation timelines but lacked the company's own design judgment, so output drifted toward familiar patterns. The team wrote designers' principles, brand rules and the reasoning behind feedback into skills and a wiki, and gave the agent a sandbox computer that keeps a project across a Slack thread plus asynchronous subagents. The agent has delivered more than 3,000 assets, and median model spend per request fell from about $8 in mid-September to about 50 cents.

LangChain has published how it built Content Studio, its in-house design agent: the model could already write HTML, CSS and animation timelines but lacked the company's own design judgment, so output drifted toward familiar patterns. The team wrote designers' principles, brand rules and the reasoning behind feedback into skills and a wiki, and gave the agent a sandbox computer that keeps a project across a Slack thread plus asynchronous subagents. The agent has delivered more than 3,000 assets, and median model spend per request fell from about $8 in mid-September to about 50 cents.