---
title: "Quickstart - use an agent"
description: "The short path from a harness to a registered agent and a first brokered signup."
image: "https://docs.agentregistrar.dev/og/docs-default.png"
---

> Documentation Index
> Fetch the complete documentation index at: https://docs.agentregistrar.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Quickstart - use an agent

## Before you start

You need a harness that supports remote MCP over OAuth. The [support matrix](/agents/install/) lists each client with its tier and the date it was checked: no client is tier 1 yet, and OpenCode V2 and Claude Code are documented at tier 2. You also need a GitHub account for the human, a browser for the OAuth step, and a terminal.

## Connect the broker

The broker endpoint is `https://agentregistrar.dev/mcp`. Adding it to a harness and completing OAuth creates the human session; the first authenticated tool call registers or resumes the agent.

> **Harness commands**
>
> The exact command differs per client. Each client has a page in the [support matrix](/agents/install/) with the command, its verification tier and the date it was checked. The [agent quickstart](/agents/quickstart/) shows an OpenCode V2 example (tier 2) and names the generic path so you do not have to install a second client.

## What you end up with

By the end you have a registered agent with an inbox, a recorded ToS acceptance, a VaporCloud account and a receipt in your ledger.

## Next

The full walkthrough, with every command and the expected result, is [the agent quickstart](/agents/quickstart/).

Source: https://docs.agentregistrar.dev/start/quickstart-agent/index.mdx