---
title: "Daemon"
description: "Background daemon lifecycle and management."
---

The sandbox-agent daemon is a background server process. Commands like `sandbox-agent opencode` and `gigacode` can ensure it is running.

## How it works

1. A daemon-aware command checks for a healthy daemon at host/port.
2. If missing, it starts one in the background and records PID/version files.
3. Subsequent checks can compare build/version and restart when required.

## Auto-upgrade behavior

- `sandbox-agent opencode` and `gigacode` use ensure-running behavior with upgrade checks.
- `sandbox-agent daemon start` uses direct start by default.
- `sandbox-agent daemon start --upgrade` uses ensure-running behavior (including version check/restart).

## Managing the daemon

### Start

```bash
sandbox-agent daemon start [OPTIONS]
```

| Option | Default | Description |
|--------|---------|-------------|
| `-H, --host <HOST>` | `127.0.0.1` | Host |
| `-p, --port <PORT>` | `2468` | Port |
| `--upgrade` | false | Use ensure-running + upgrade behavior |

```bash
sandbox-agent daemon start
sandbox-agent daemon start --upgrade
```

### Stop

```bash
sandbox-agent daemon stop [OPTIONS]
```

| Option | Default | Description |
|--------|---------|-------------|
| `-H, --host <HOST>` | `127.0.0.1` | Host |
| `-p, --port <PORT>` | `2468` | Port |

### Status

```bash
sandbox-agent daemon status [OPTIONS]
```

| Option | Default | Description |
|--------|---------|-------------|
| `-H, --host <HOST>` | `127.0.0.1` | Host |
| `-p, --port <PORT>` | `2468` | Port |

## Files

Daemon state is stored under the sandbox-agent data directory (for example `~/.local/share/sandbox-agent/daemon/`):

| File | Purpose |
|------|---------|
| `daemon-{host}-{port}.pid` | PID of running daemon |
| `daemon-{host}-{port}.version` | Build/version marker |
| `daemon-{host}-{port}.log` | Daemon stdout/stderr log |
