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

# AppSignal for Node.js: Command line tools

The optional [`@appsignal/cli` package][package] includes several command-line tools. These tools make it easier to install AppSignal in an application, send deploy notifications and diagnose any problems with the installation.

## Diagnose

A self-diagnostic tool for the AppSignal for nodejs gem. This tool can be used to debug your AppSignal installation and is one of the first things our support team asks for when there's an issue.

Read more about the [`npx @appsignal/cli diagnose`][cli-diagnose] command line tool.

[package]: https://github.com/appsignal/appsignal-nodejs

[cli-diagnose]: /nodejs/3.x/command-line/diagnose.html

[cli-demo]: /nodejs/3.x/command-line/demo.html