---
slug: "EventReact"
name: "EventReact"
type: "Strategy"
layer: "Mind"
ref: "EventReact#4bad"
sema_id: "sema:EventReact#mh:SHA-256:4bad4fe25039564ac25139829244df5133e31cb65e5bd50ddbc953cad0082eb9"
tags: ["Mind","Strategy"]
updated: 2026-11-11
mindscape: "bootstrap"
index_url: https://mindscape.world/scapes/bootstrap.json
url: https://mindscape.world/bootstrap/EventReact/
related: ["Agent","ReAct"]
---

# EventReact

Responding to external triggers rather than polling

Layer: Mind · Category: Strategy

## Mechanism

Event-Driven Response: [Agent](https://mindscape.world/scapes/bootstrap/Agent.md) subscribes to event types. Events queued by priority. Handler invoked per event. Handler execution atomic. Unhandled events logged or escalated. It implements the reactive loop, often triggering a [ReAct](https://mindscape.world/scapes/bootstrap/ReAct.md) cycle upon signal reception.

## Invariants

- Handler matches event type
- Response latency < Max_Latency

## Preconditions

- Event listener active
- Trigger event occurs

## Postconditions

- Handler executed

## Failure modes

- Event Storm: Cascade of events overwhelms handler capacity, causing dropped or delayed responses.

## Builds on

- [Agent](https://mindscape.world/scapes/bootstrap/Agent.md) (Mind; References)
- [ReAct](https://mindscape.world/scapes/bootstrap/ReAct.md) (Mind; References)

## Used by

—

## Identity

- Sema ID: `sema:EventReact#mh:SHA-256:4bad4fe25039564ac25139829244df5133e31cb65e5bd50ddbc953cad0082eb9`
- Ref: `EventReact#4bad`
- Supersedes:
  - `sema:EventReact#mh:SHA-256:7db170eab2eaf5a1764ee61af391ab290db9e83835f6ca3107305d2a709554fe`
  - `sema:EventReact#mh:SHA-256:a0ef747d97aabc453629d237c4d625d02c26d22515a3f958c1ab261c156a3b56`
  - `sema:EventReact#mh:SHA-256:d2e17a1a86ecdfab6743565083d7b92c41df3bc9515560ee73dba34b2a62bedd`
  - `sema:EventReact#mh:SHA-256:6f43ed9daa820d62cf2701cd394d4853d5a9d0e527270d11edd8748d624e27a5`
  - `sema:EventReact#mh:SHA-256:f71a4aacd1cedf16a425dea52ea0e712de4617c7d527798e5cd1d0aabf678d17`

## Links

- [Pattern page](https://mindscape.world/bootstrap/EventReact/)
- [View in the interactive graph](https://mindscape.world/bootstrap/#EventReact)
- [JSON](https://mindscape.world/scapes/bootstrap/EventReact.json)
- [Index of all patterns](https://mindscape.world/scapes/bootstrap.json)