R""(

# Description

This command reads from standard input a JSON representation of a
[store derivation] to which an [*installable*](./nix.md#installables) evaluates.

Store derivations are used internally by Nix. They are store paths with
extension `.drv` that represent the build-time dependency graph to which
a Nix expression evaluates.


[store derivation]: @docroot@/glossary.md#gloss-store-derivation

`nix derivation add` takes a single derivation in the following format:

{{#include ../../json/derivation.md}}

)""