> For the complete documentation index, see [llms.txt](https://docs.codebattles.ru/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.codebattles.ru/en_v3/readme.md).

# About the V3 System

{% hint style="success" %}
This documentation is for version v3, which is actively developed and supported
{% endhint %}

## Who This System Is For

Initially, the system was developed for schools and teachers who want to conduct lessons in a more interesting and interactive format. However, you can also organize your own competitions, for example, among your friends.

## Navigation

For your convenience, all documentation is divided into sections. You can access them from the menu on the left.

## For Developers

If you are a developer and want to write your own tools, the API description can be found in the API section.

[Backend API](/en_v3/api/backend.md) - main API

[Checker API](/en_v3/api/checker-api.md) - API for checkers that verify solutions

{% hint style="info" %}
If you found an answer to your question here, you can write to [Telegram](https://doctorixx.t.me/)
{% endhint %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.codebattles.ru/en_v3/readme.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.