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

# Overview

> Build worlds, evaluate agents, and read their scores from code.

Use the Chronicle API to build simulated systems, test your agents, and
compare their scores.

SDKs are available for **Python, TypeScript, JavaScript, Go, and Rust**.
Choose a language in any code example to switch examples across the docs.

## Get started

Create an API key in **Settings → API keys**, then follow the
[SDK setup](/api-reference/languages/overview). See
[Authentication](/api-reference/authentication) for key settings and scopes.

## API guides

| Guide                                     | What you can do                                           |
| ----------------------------------------- | --------------------------------------------------------- |
| [Worlds](/api-reference/worldsmith)       | Build and launch simulated systems.                       |
| [Twins](/api-reference/twins)             | Connect to simulated services and inspect their activity. |
| [Agents](/api-reference/agents)           | Register and manage agent versions.                       |
| [Tasks and scorers](/api-reference/tasks) | Define the work and how it is graded.                     |
| [Evaluations](/api-reference/evaluations) | Run tests and compare scores.                             |
| [Events](/api-reference/telemetry)        | Send and query events and traces.                         |

<Card title="Run an evaluation" icon="play" href="/api-reference/evaluations#start-a-run">
  Run your agent against a task suite and inspect its scores.
</Card>