Vercel built a feedback loop that treats agent instructions like software
Vercel ran more than 200 agent runs to build design.md, a new public prompt file designed to help agents create The post Vercel built a feedback loop that treats agent instructions like software appeared first on The New Stack .
Vercel, the company behind the popular serverless platform, has developed a new method to improve the reliability of agent-generated web pages. They created a public prompt file called design.md, which provides guidance to agents on how to design pages that match Vercel's brand. By treating agent instructions like software, Vercel was able to reduce the number of failures in six-page tests by 57%, although they acknowledge that this is not a perfect solution.
The company tested different iterations of the design.md file, using a set of seven evaluation prompts to measure the impact of changes on the generated output. The system now includes a public stylesheet, an evaluation loop that turns human feedback into updated guidance, and deterministic checks for mechanical failures. Vercel's approach demonstrates how teams can manage human judgment as reusable agent guidance, following a development lifecycle similar to software development.
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