# Architecture: hyper-p2p-cron-gossip

**Protocol:** `cron-gossip/v1`

```mermaid
flowchart TB
  App --> CG[HyperP2PCronGossip]
  CG --> Jobs["_jobs Map"]
  CG --> Tick[tick dueCron]
  Tick --> Fire[cron-fire gossip]
```

## Wire messages

| type | fields | direction | behavior |
|------|--------|-----------|----------|
| `cron-fire` | `jobId`, `expr`, `peer`, `at` | bidirectional | Sync `lastRun`, learn unknown jobs |

## State model

Job: `{ jobId, expr, lastRun, at }`.

## Composition

Pair with `hyper-p2p-leader-lease` so only the leader schedules cluster-wide jobs; use `hyper-p2p-deadline-queue` for per-task deadlines after fire.