eve

Eve is Vercel's framework for building durable AI agents where the agent's definition lives as plain files, not buried in code. Its instructions, tools, skills, message channels, and scheduled jobs sit in a conventional folder layout you can read, diff, and reason about. Apache-2.0, free, and currently in public beta.

The filesystem-as-source-of-truth idea is the interesting part: an agent's behavior is inspectable and version-controlled instead of tangled in application logic. It is a TypeScript/Node framework you run yourself, so the ops are moderate and familiar. Being a Vercel project, it is oriented toward their deployment and model ecosystem, and being public beta, the APIs can still move under you.

This is for TypeScript developers who want maintainable, inspectable agents and like the idea of the agent's whole definition being files on disk. Solo and small teams: free to build and run. Larger teams: free framework, but factor in beta churn and the Vercel-shaped defaults. If you want a managed agent platform with a stable API and a support contract, LangGraph Platform or OpenAI's Assistants API are the paid alternatives.

The catch is beta. The design is clean and the file-based approach is a readable way to keep agents legible, but public beta means expect breaking changes and thin edges. Build with it if you are comfortable tracking a moving target; wait if you need stability today.