# ESMValCore

> ESMValCore is the core of ESMValTool: it finds, fixes, and preprocesses Earth system model data according to a YAML recipe and runs diagnostic scripts.


2026, ESMValTool Development Team

## Pages in this subsection

- [The recipe format](index.html.md): *  Overview
- [Overview](overview.html.md): The recipe is the main control file of ESMValTool.
- [Preprocessor](preprocessor.html.md): In this section, each of the preprocessor modules is described,

## Optional

- [Top-level llms.txt](../llms.txt): Complete documentation index.