event-listeners skillA
event-listeners is agent-read markdown (skill) from softtor/nestjs-hexagonal: 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..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# Event Listeners Domain events emitted via `entity.commit()` flow through the NestJS CQRS `EventBus`. Listeners are `@EventsHandler` classes that react to these events. Multiple handlers for the same event run in parallel via `Promise.allSettled` — if one fails, others continue. 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) ``` --- ## When NOT to Create a Listener (anti-over-engineering) | Situation | Do this instead | |---|---| …
Read the whole file at its exact version.
How to install
mdr add softtor/nestjs-hexagonal/event-listeners@git:20260327.7ebc591mdr add softtor/nestjs-hexagonal/event-listeners@sha256:2bcd8ae4e332fda5Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_lrogrfusvdhpu2r3)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260327.7ebc591 latest | 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
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (15012 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
softtor/nestjs-hexagonal · 5 stars · license MIT · pushed 2026-09-23 · 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/2bcd8ae4e332fda54691c949e4834689399833cc26721343c81960296eaebd5c
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