Home / softtor / nestjs-hexagonal · GitHub

event-listeners SKILL.md skillA

event-listeners from softtor/nestjs-hexagonal is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add softtor/nestjs-hexagonal/event-listeners@git:20261008.7b451f7

Pins git:20261008.7b451f7 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: softtor/nestjs-hexagonal
Path: skills/event-listeners/SKILL.md
Versions recorded: 5
Latest version: git:20261008.7b451f7, committed Oct 8, 2026
First version recorded: Mar 26, 2026
Size: 15,342 bytes
Repository stars: 5
License: MIT

Use when creating event listeners that react to domain events — same-BC side effects (projections, audit, cache), cross-BC reactions (another bounded context consuming events), or bridge listeners (WebSocket broadcast, RabbitMQ publish, email). Covers listener taxonomy, placement rules, Strategy+Gateway pattern for fan-out, and anti-over-engineering criteria.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# Event Listeners

Domain events emitted via `await events.from(entity).publish()` flow through the NestJS CQRS `EventBus`. Listeners are `@EventsHandler` classes that react to these events. EventBus publication confirms handoff to the bus; it does not await listener completion. Handle listener failures in their own infrastructure.

This skill covers WHERE listeners live, WHAT they do, and WHEN you actually need one.

---

## Decision Tree

```
Do you need to react to a domain event?
│
├─ Is it a side effect within the SAME bounded context?
│  └─ YES → Same-BC Listener (see Section 1)
│     Examples: update Redis projection, write audit log, invalidate cache
│
├─ Does ANOTHER bounded context need to react?
│  └─ YES → Cross-BC Listener (see Section 2)
│     Examples: Billing creates invoice when Order is created
│
├─ Does the event need to leave the process?
│  └─ YES → Bridge Listener (see Section 3)
│     Examples: WebSocket broadcast, RabbitMQ publish, send email, call webhook
│
└─ Is the side effect simple and only 1 consumer exists?
   └─ YES → Consider putting it in the command handler directly (no listener needed)
```

---
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add softtor/nestjs-hexagonal/event-listeners@sha256:d10039de793a8006

The line at the top of this page pins the label git:20261008.7b451f7, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_lrogrfusvdhpu2r3.svg)](https://markdownregistry.com/a/art_lrogrfusvdhpu2r3)

4 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 5 versions of this file, between Mar 26, 2026 and Oct 8, 2026, about one every 49 days.

version	committed	commit	size	audit
git:20261008.7b451f7 latest	2026-10-08	7b451f7	15,342 B	A	view · diff
git:20260327.7ebc591	2026-03-27	7ebc591	15,012 B	A	view · diff
git:20260327.3ac41d8	2026-03-27	3ac41d8	12,667 B	A	view · diff
git:20260327.2694398	2026-03-27	2694398	12,557 B	A	view · diff
git:20260326.a4e1dae	2026-03-26	a4e1dae	12,231 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (15342 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

softtor/nestjs-hexagonal · 5 stars · license MIT · pushed 2026-10-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_lrogrfusvdhpu2r3
GET https://markdownregistry.com/api/v1/resolve?ref=softtor/nestjs-hexagonal/event-listeners
GET https://markdownregistry.com/api/v1/blob/d10039de793a8006ddb0c447392701162620a72b111c43c125d261153c34f7d1

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.