# Useful tools

- [Header files](https://42-cursus.gitbook.io/guide/useful-tools/header-files.md): This page will describe some of the concepts used in header files
- [C Structures](https://42-cursus.gitbook.io/guide/useful-tools/c-structures.md): What are C structures
- [Linked Lists (todo)](https://42-cursus.gitbook.io/guide/useful-tools/linked-lists-todo.md)
- [Makefiles](https://42-cursus.gitbook.io/guide/useful-tools/makefiles.md): Since makefiles are some kind of mystic shit, I'll try my best to explain some basics.
- [Switch statement](https://42-cursus.gitbook.io/guide/useful-tools/switch-statement.md): A tool to facilitate complex if ... else if statements.
- [File descriptors (FD)](https://42-cursus.gitbook.io/guide/useful-tools/file-descriptors-fd.md): I'll try to explain what is a file descriptor is since it's used in most projects


---

# Agent Instructions: 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://42-cursus.gitbook.io/guide/useful-tools.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.