zeph 0.19.0

Lightweight AI agent with hybrid inference, skills-first architecture, and multi-channel I/O
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# Daemon and Scheduler

Run Zeph as a long-running process with component supervision and cron-based periodic tasks.

## Headless Daemon Mode

The `--daemon` flag starts Zeph as a headless background agent with full capabilities (LLM, tools, memory, MCP) exposed via an A2A JSON-RPC endpoint. Requires the `a2a` feature.

```bash
cargo build --release --features a2a
zeph --daemon
```

The daemon bootstraps a complete agent using a `LoopbackChannel` for internal I/O, starts the A2A server, and runs under `DaemonSupervisor` with PID file lifecycle and graceful Ctrl-C shutdown. Connect a TUI client with `--connect` for real-time streaming interaction.

See the [Daemon Mode guide](../guides/daemon-mode.md) for configuration, usage, and architecture details.

## Daemon Supervisor

The daemon manages component lifecycles (gateway, scheduler, A2A server), monitors for unexpected exits, and tracks restart counts.

### Configuration

```toml
[daemon]
enabled = true
pid_file = "~/.zeph/zeph.pid"
health_interval_secs = 30
max_restart_backoff_secs = 60
```

### Component Lifecycle

Each registered component is tracked with a status (`Running`, `Failed(reason)`, or `Stopped`) and a restart counter. The supervisor polls all components at `health_interval_secs` intervals.

### PID File

Written on startup for instance detection and stop signals. Tilde (`~`) expands to `$HOME`. Parent directory is created automatically.

## Cron Scheduler

Run periodic tasks on cron schedules with SQLite-backed persistence.

### Feature Flag

```bash
cargo build --release --features scheduler
```

### Configuration

```toml
[scheduler]
enabled = true

[[scheduler.tasks]]
name = "memory_cleanup"
cron = "0 0 0 * * *"          # daily at midnight
kind = "memory_cleanup"
config = { max_age_days = 90 }

[[scheduler.tasks]]
name = "health_check"
cron = "0 */5 * * * *"        # every 5 minutes
kind = "health_check"
```

Cron expressions use 6 fields: `sec min hour day month weekday`. Standard features supported: ranges (`1-5`), lists (`1,3,5`), steps (`*/5`), wildcards (`*`).

### Task Kind Values

The `kind` field in `[[scheduler.tasks]]` accepts a fixed set of values. Invalid values are rejected at config parse time — the process will not start if an unknown kind is specified.

| Kind | Description |
|------|-------------|
| `memory_cleanup` | Remove old conversation history entries |
| `skill_refresh` | Re-scan skill directories for changes |
| `health_check` | Internal health verification |
| `update_check` | Query GitHub Releases API for newer versions |
| `experiment` | Run an automatic experiment session (requires `experiments` feature; see [Experiments](../concepts/experiments.md#scheduler-integration)) |
| `custom:<name>` | User-defined task registered via the `TaskHandler` trait |

For `custom` tasks, specify the kind as `custom:my_task_name` and register the handler in code before starting the scheduler.

### Update Check

Controlled by `auto_update_check` in `[agent]` (default: true):

- **With scheduler**: runs daily at 09:00 UTC via cron task
- **Without scheduler**: single one-shot check at startup

### Custom Tasks

Implement the `TaskHandler` trait:

```rust
pub trait TaskHandler: Send + Sync {
    fn execute(
        &self,
        config: &serde_json::Value,
    ) -> Pin<Box<dyn Future<Output = Result<(), SchedulerError>> + Send + '_>>;
}
```

### Deferred (one-shot) tasks

One-shot tasks fire once at a specified time and are removed automatically after execution. The `run_at` field accepts flexible time formats:

| Format | Example |
|--------|---------|
| ISO 8601 UTC | `2026-03-10T18:00:00Z` |
| Relative shorthand | `+2m`, `+1h30m`, `+3d` |
| Natural language | `in 5 minutes`, `today 14:00`, `tomorrow 09:30` |

For `custom` kind deferred tasks, the `task` field content is injected as `Execute the following scheduled task now: <task>` into the agent loop at fire time. Use `"Remind the user to X"` for user notifications, or a direct instruction for agent-executed actions.

### Persistence

Job metadata is stored in a `scheduled_jobs` SQLite table. The scheduler ticks every 60 seconds by default (`tick_interval_secs`) and checks whether each task is due based on `last_run` and the cron expression.

## Shutdown

Both daemon and scheduler listen on the global shutdown signal and exit gracefully.