> For the complete documentation index, see [llms.txt](https://mercure-technologies.gitbook.io/xprem/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mercure-technologies.gitbook.io/xprem/eoas/overview.md).

# Overview

EOAS is an npm CLI for managing application updates.

Use it to:

* Deploy and republish updates.
* Roll back an update.
* Initialize a project and generate certificates.
* Audit an existing configuration.

EOAS works in a developer's local environment and in CI pipelines.

### Authentication

EOAS authenticates with `EOO_TOKEN`, an application-scoped API key.

Generate it from the dashboard, on your application's **API tokens** page. The database stores only the token hash, so the value is shown once at creation and cannot be retrieved later.

Use a separate key for each CI environment or workflow and keep every key in your CI secret store. You can scope what each key may do, branch by branch, with [Token access](/xprem/security/token-access.md).

### Pin the EOAS version in CI

{% hint style="warning" %}
Never run unversioned `npx eoas` in CI. Always use an explicit EOAS version.
{% endhint %}

An unpinned command can fetch a newer CLI release unexpectedly. This can introduce breaking changes into a pipeline.

Use the EOAS version that exactly matches the server version:

`npx eoas@<server-version> <command>`

EOAS releases stay synchronized with the server version during release publishing. Update the CLI version whenever you upgrade the server.


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