# 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

- [Composing recipes](composing-recipes.html.md): This notebooks shows how to fill the datasets section in a recipe.
- [Discovering data](discovering-data.html.md): This notebook shows how to find out what data is available locally as well as on ESGF. It also shows...
- [Loading, processing, and visualizing data](loading-and-processing-data.html.md): This notebook shows how to load a dataset, use the preprocessor functions, and visualize the result....

## Optional

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