Flintchart: A "chart intermediate language" for AI Agents. What real problems does it solve?

You ask the AI ​​Agent to draw a picture for you. It started to output, Vega-Lite JSON, 200 lines. The syntax is fine, but the starting point of the coordinate axis is negative, the color scheme is eye-catching, and the legend is placed on the data points. You ask it to be modified, and after three revisions, it finally stops reporting errors, but it still looks unreadable. This is not a poorly written prompt. It's the chart library itself that's too verbose. For a decent heat map, ECharts needs to write 50 lines of configuration, and Vega-Lite needs to declare the time unit, axis format, color range, and cell size. If any parameter is filled in incorrectly, the graph will collapse. Asking LLM to remember these details is similar to asking a translator to memorize a dictionary. Microsoft Research open sourced Flint in July 2026, a visual tool designed specifically for AI Agents.