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

# Overview

> Validate, simulate, and harden your agent systems with ArkSim.

## What is ArkSim?

ArkSim is an open-source agent testing tool designed to help developers validate, simulate, and harden their agent systems. It focuses on reproducible interaction simulations to identify reliability and idempotency gaps before production deployment.

<Frame>
  <img className="hidden dark:block" src="https://mintcdn.com/arklex-ca4e8217/fzSC6u7V-KKJVmxu/images/arksim-workflow.svg?fit=max&auto=format&n=fzSC6u7V-KKJVmxu&q=85&s=65d2a48ed5fe87f12ca2071102107d94" alt="ArkSim Workflow" width="2064" height="1104" data-path="images/arksim-workflow.svg" />

  <img className="dark:hidden" src="https://mintcdn.com/arklex-ca4e8217/fzSC6u7V-KKJVmxu/images/arksim-overview.svg?fit=max&auto=format&n=fzSC6u7V-KKJVmxu&q=85&s=ec655d3c8f8f1d1c1d745c6b68e75313" alt="ArkSim Workflow" width="2064" height="1104" data-path="images/arksim-overview.svg" />
</Frame>

## Who is it for?

Developers looking to ensure their agents are robust, reliable, and ready for real-world interactions, without relying on manual testing.

## What makes it different?

<CardGroup cols={2}>
  <Card icon="code" title="Open-source">
    Fully transparent and customizable, letting you extend or adapt the tool as needed.
  </Card>

  <Card icon="flask" title="End-to-end testing">
    Test your agent in realistic scenarios to uncover gaps in behavior or reliability before production.
  </Card>

  <Card icon="bolt" title="Pre-built scenarios">
    Use predefined scenarios to quickly validate your agent and jump-start testing effectively.
  </Card>

  <Card icon="puzzle-piece" title="Easily extensible">
    Integrate with existing systems and tailor the testing environment to your specific needs.
  </Card>
</CardGroup>

## Core Capabilities

### Scenarios

A scenario is a test case that defines a simulated user’s attributes, goals, and prior knowledge. It allows you to test different versions of your agent against the same set of scenarios to compare behavior and catch regressions.

### Simulation

Simulation turns scenarios into live, multi-turn conversations with your agent. You get full transcripts (and optional metadata) that you can critically inspect or pass to evaluation.

### Evaluation

Evaluation scores your agent on those conversations. You get quantitative and qualitative metrics (e.g. helpfulness, faithfulness) and agent behavior failures that you can prioritize and fix.

## Ready to start?

Test your AI agent with ArkSim. Follow the quick start or explore the source on GitHub.

<CardGroup cols={2}>
  <Card icon="rocket" href="./quickstart" title="Quick Start">
    Set up your first simulation in minutes.
  </Card>

  <Card icon="github" href="https://github.com/arklexai/arksim" title="Source Code">
    Explore full implementation on GitHub.
  </Card>
</CardGroup>