---
slug: "Event"
name: "Event"
type: "Data Structures"
layer: "Infrastructure"
ref: "Event#3675"
sema_id: "sema:Event#mh:SHA-256:36757bd8344e1fd7161bd2f23d6588180fbaaf9cff5ef8be8a205effbf4438b6"
tags: ["Infrastructure","Data Structures"]
updated: 2026-11-11
mindscape: "bootstrap"
index_url: https://mindscape.pages.dev/bootstrap/index.json
url: https://mindscape.pages.dev/bootstrap/Event/
related: ["State","Stream","Probability","TaskLifecycle"]
---

# Event

Discrete temporal occurrence

Layer: Infrastructure · Category: Data Structures

## Mechanism

A discrete occurrence involving a change in [State](https://mindscape.pages.dev/bootstrap/State.md) at a specific point in time. Events are the atomic units of causality and history, distinct from continuous [Stream](https://mindscape.pages.dev/bootstrap/Stream.md)s.

## Invariants

—

## Failure modes

—

## Data schema

```json
{
  "type": "object",
  "required": [
    "event_id",
    "timestamp",
    "type"
  ],
  "properties": {
    "event_id": {
      "type": "string",
      "description": "Unique identifier"
    },
    "type": {
      "type": "string",
      "description": "Event classification"
    },
    "payload": {
      "type": "object",
      "description": "Data associated with the occurrence"
    },
    "timestamp": {
      "type": "string",
      "format": "date-time"
    }
  }
}
```

## Builds on

- [State](https://mindscape.pages.dev/bootstrap/State.md) (Infrastructure; References)
- [Stream](https://mindscape.pages.dev/bootstrap/Stream.md) (Infrastructure; References)

## Used by

- [Probability](https://mindscape.pages.dev/bootstrap/Probability.md) (Infrastructure; References)
- [TaskLifecycle](https://mindscape.pages.dev/bootstrap/TaskLifecycle.md) (Infrastructure; References)

## Identity

- Sema ID: `sema:Event#mh:SHA-256:36757bd8344e1fd7161bd2f23d6588180fbaaf9cff5ef8be8a205effbf4438b6`
- Ref: `Event#3675`
- Supersedes:
  - `sema:Event#mh:SHA-256:035497ae50cbbc61e245e1116f6e9b4a6e3c73aa41252052e8dd74a4dde35b96`

## Links

- [Pattern page](https://mindscape.pages.dev/bootstrap/Event/)
- [View in the interactive graph](https://mindscape.pages.dev/bootstrap/#Event)
- [JSON](https://mindscape.pages.dev/bootstrap/Event.json)
- [Index of all patterns](https://mindscape.pages.dev/bootstrap/index.json)