EVE

A hands-on, beginner-friendly walkthrough of building an AI agent with Vercel eve: scaffold the project, define an agent and a typed tool with defineTool, run it locally, call it through the durable session and stream API, and deploy to Vercel Functions.

At Vercel Ship 26 in London on June 17, 2026, Vercel shipped a wave of agent-era tooling: the open-source eve agent framework, Vercel Drop for drag-and-drop deploys with no Git or CLI, spend caps for AI Gateway API keys, and the HarnessAgent API in AI SDK 7 that unifies Claude Code, Codex, and Pi behind one interface.

Vercel launched eve at Ship 26, an open-source agent framework it calls Next.js for agents. You define each agent as files under an agent/ directory, and eve compiles it into a production app on Vercel Functions with durable execution, sandboxes, approvals, subagents, 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.

A concrete step-by-step guide to moving your development workflow from Cursor to Claude Code - settings, rules, keybindings, and the habits that transfer.

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.