EVE

Run Fable 5 agents on Vercel eve: wire durable sessions, Sandbox code execution, approvals and subagents to a long-horizon model, with honest costs and fit.

Build your first AI agent with Vercel eve: scaffold a project, add a typed tool with defineTool, run it locally, call the session API and deploy to Vercel.

Everything Vercel shipped at Ship 26: the open-source eve agent framework, Vercel Drop, AI Gateway spend caps per API key and the AI SDK 7 HarnessAgent API.

Vercel eve is an open-source agent framework billed as Next.js for agents. Define an agent as files and get durable execution, sandboxes and evals built in.

Run Bash commands with Ctrl+B and retrieve output by task ID.

Per-directory prompt history with Ctrl+R reverse search.

Persistent project instructions loaded every session; supports nested dirs.

Low, medium, high, xhigh, and max for adaptive reasoning control.

Create reusable subagent definitions at project or user level.

Prevent bloating the main conversation with research or exploration.

Event-driven automation with 20+ lifecycle events.

Fire on task lifecycle events.

Fires when Claude finishes responding. Can prevent the stop.

Run shell scripts on events with environment variable passing.

Local, project, user, and plugin-level MCP configurations.