# API Reference
Reference pages for CLI behavior and `.gctf` rules.
Use this section when you need exact behavior.
## Core pages
- [Command Line Interface](./command-line) - commands and flags
- [Test File Format](./test-files) - syntax rules and execution order
- [Assertions](./assertions) - expression and plugin usage
- [Report Formats](./report-formats) - JSON, JUnit, Allure output
- [Section Reference](../sections/) - one page per `.gctf` section
## Related
- [Getting Started](../../getting-started/installation)
- [Guides Overview](../../)