eve, Vercel's open-source framework for building and operating agents

Vercel open-sources eve, a framework for building and operating AI agents with durable execution, isolated sandboxes, and MCP support in a public preview.

Vercel, the creator of the Next.js web framework, is open-sourcing eve, its in-house framework for designing, executing, and operationalizing agents. The premise: to describe what an agent does without rebuilding the production plumbing every time. This comes out of the box, including durable execution, isolated sandbox, human approvals, sub-agents, and evaluations. Vercel draws a parallel with its own Next.js, which had standardized web development.

The core idea is encapsulated in one formula: an agent is a folder. Each file describes a component, the model, the instructions that serve as a system prompt, the tools in TypeScript, the skills in Markdown, the sub-agents, the channels through which it communicates, and the schedules when it acts autonomously. eve connects everything at build time, without any boilerplate code to maintain.

On the production side, each conversation becomes a durable workflow with resume points, capable of surviving a crash and resuming where it left off. The generated code runs in an isolated sandbox, any sensitive action can require approval, and connections to third-party tools go through an MCP server or an API. A single agent serves multiple channels, from Slack to Discord, with each run leaving an actionable OpenTelemetry trace. Vercel states it operates over a hundred agents internally this way. The public preview is available and the repository lives on GitHub.