> For the complete documentation index, see [llms.txt](https://k4k3ru.gitbook.io/k4k3ru-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://k4k3ru.gitbook.io/k4k3ru-docs/agent/configuration.md).

# Configuration and Local State

K4K3RU Agent stores its configuration, account context, credentials, and update-check cache in `~/.k4k3ru`.

## Local Files

| File          | Purpose                                             | Sensitivity            |
| ------------- | --------------------------------------------------- | ---------------------- |
| `config.toml` | Optional Agent configuration                        | Normally non-sensitive |
| `state.json`  | Account ID and email used for local account context | Personal data          |
| `auth.json`   | API credentials and signing material                | Sensitive              |
| `update.json` | Cached npm update-check result                      | Non-sensitive          |

Agent creates the directory when it is required. Credential files are written with owner-only permissions.

## Credential Selection

`auth.json` can contain multiple unexpired credentials. A newly created credential becomes the default for signed requests. Agent migrates the older single-credential file format when it loads one.

The local credential list omits secrets:

```
/account api-key list
```

## Configuration Precedence

Agent resolves settings in this order:

1. Command-line options
2. `~/.k4k3ru/config.toml`
3. Built-in defaults

The production Gateway URL is built in. The `gateway.url` setting can override it for local development. Plain HTTP is accepted only for localhost and loopback IP addresses.

The `updates.check_on_startup` setting controls startup update checks.

## Update Checks

Interactive npm-managed installations check the npm `latest` version at startup. A successful result is cached for 24 hours. If the npm registry is unavailable, Agent still starts.

Update Agent with:

```bash
npm install --global k4k3ru-agent@latest
```

## Protect Local State

* Never commit the `.k4k3ru` directory or its files.
* Do not print or log `auth.json`.
* Do not attach credential files to support requests.
* Protect backups that contain `state.json` or `auth.json`.
* Do not weaken file permissions on `auth.json`.

Agent does not expose a local API. Other applications should use the public K4K3RU API and their own securely managed credentials.


---

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