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

# Sign-in and setup

> nohead login, nohead logout, nohead link, nohead whoami, nohead health, nohead flags.

Every command also takes the [global options](https://docs.nohead.io/cli/commands/global-options.md), such as `--json`.

## `nohead login`

Sign in with the browser and save an API key for the project you choose; a key piped in is checked and saved as it is (echo \$KEY | nohead login)

```bash theme={null}
nohead login [options]
```

## `nohead logout`

Forget the API key saved for the project in use (the key itself stays valid; revoke it in the web app)

```bash theme={null}
nohead logout [options]
```

## `nohead link`

Use a project in this folder and the folders below it: writes nohead.json, which holds no secret, so it can be committed.

```bash theme={null}
nohead link [options] <project>
```

| Argument | |
| - | - |
| `<project>` | Project ID (prj\_...) |

## `nohead whoami`

Show the credentials in use (API key, project and where it came from, scopes)

```bash theme={null}
nohead whoami [options]
```

## `nohead health`

Check that the API is reachable and healthy.

```bash theme={null}
nohead health [options]
```

## `nohead flags`

Show feature flags as evaluated for your API key's project.

```bash theme={null}
nohead flags [options]
```


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