Vercel Eve

What it does

When your agent uses it

• Creating an Eve agent
• Durable sessions
• Deploying Eve on Vercel
• The separate Vercel AI SDK Agent APIs such as ToolLoopAgent

Example prompts

• “/vercel-eve”

Requirements

• Node.js
• A credential in AI_GATEWAY_API_KEY
• Compatibility (from SKILL.md): Requires Node.js 24+ for the current Eve package. Deployment requires an LLM provider credential or Vercel AI Gateway access; self-hosted durable execution requires persistent workflow storage.

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Start with the generated project structure. Put agent behavior in agent/instructions.md, runtime choices in agent/agent.ts, and one typed…
2. 2Keep authority outside the model prompt. Use typed tools, connections, sandbox boundaries, and route authentication instead of placing…
3. 3Treat a durable session as a workflow, not an in-memory chat. Define persistence, idempotency, callback reachability, and recovery before…
4. 4On self-hosted deployments, replace every Vercel service deliberately. A Node process that starts is not evidence that workflow callbacks…
5. 5Verify with a health request and a real authenticated session that exercises the workflow path. Never treat an HTTP 200 alone as a…

What it can do on your machine

Read from SKILL.md and the folder at commit 22b4723. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • npx
  • npm
  • vercel

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md. Its commands use npx, npm and vercel, which can reach the network depending on how they are called.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • AI_GATEWAY_API_KEY

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Requires Node.js 24+ for the current Eve package. Deployment requires an LLM provider credential or Vercel AI Gateway access; self-hosted durable execution requires persistent workflow storage.

  From compatibility in the SKILL.md frontmatter.

Context cost

Vercel Eve loads about 1.9k tokens when it runs, and up to ~3.9k if it reads all its reference files. Until then it costs about 105 tokens; SKILL.md has 821 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~105

When it runs · the whole SKILL.md, loaded when a task matches

~1.9k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~3.9k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from magnus919/agent-skills at commit 22b4723, republished under its MIT licence (© magnus919). 821 words, ~1,904 tokens.

name

vercel-eve

description

Build, develop, deploy, self-host, secure, and troubleshoot durable backend AI agents with Vercel Eve. Use when creating an Eve agent, adding tools, skills, subagents, channels, schedules, sandboxing, durable sessions, observability, or deploying Eve on Vercel or a Node host. Do not use for the separate Vercel AI SDK Agent APIs such as ToolLoopAgent or WorkflowAgent; use an AI SDK-specific skill for those.

compatibility

Requires Node.js 24+ for the current Eve package. Deployment requires an LLM provider credential or Vercel AI Gateway access; self-hosted durable execution requires persistent workflow storage.

license

MIT

metadata.source

https://github.com/vercel/eve

metadata.research_checked

2026-07-15

npx eve@latest init my-agent
cd my-agent
npm run dev

import { defineAgent } from "eve";

export default defineAgent({
  model: "anthropic/claude-opus-4.8",
});

import { defineTool } from "eve/tools";
import { z } from "zod";

export default defineTool({
  description: "Look up a city’s current weather.",
  inputSchema: z.object({ city: z.string().min(1) }),
  async execute({ city }) {
    return { city, condition: "Sunny" };
  },
});

eve build
PORT=3000 eve start --host 0.0.0.0

© magnus919, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 5 other files (references) in vercel-eve of magnus919/agent-skills.

• SKILL.md
• README.md
• evals/evals.json
• references/deployment-and-self-hosting.md
• references/development-and-architecture.md
• references/source-index.md

Open the folder on GitHubat commit 22b4723