eve
A filesystem-first framework for building durable AI agents, keeping an agent's instructions, tools and configuration in conventional project files so it is easy to inspect, extend and operate.
eve scaffolds a new agent with npx eve@latest init my-agent, which installs dependencies, initializes Git, and starts an interactive terminal UI; passing a path instead adds eve to an existing project.
An agent's instructions live in a plain agent/instructions.md file, custom tools are defined in files under agent/tools/ with a defineTool helper and a Zod input schema, and the model is chosen in agent/agent.ts with defineAgent. It supports human-in-the-loop prompts, subagents and schedules.
It is written in TypeScript, ships its own documentation inside the installed package so a coding agent can read it locally, is currently in beta under Vercel's beta terms, and is licensed under Apache-2.0.