> ## Documentation Index
> Fetch the complete documentation index at: https://instro.nominal.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Concepts

> Core building blocks behind instro's instruments and drivers

* **[Library](/library/library)**: the `Instrument`, `Measurement`, and `Command`.
* **[Publishers](/library/publishers)**: how to get your measurements.
* **[Exceptions](/library/exceptions)**: the `instro`-specific error types and how to handle them.
* **[Custom instruments](/library/custom-instruments)**: build a new instrument type by subclassing `Instrument`.
* **[Contrib drivers](/library/contrib)**: community drivers Nominal accepts on contributor verification.