nw-ddd-eventsourcing SKILL.md skillA
nw-ddd-eventsourcing from nwave-ai/nwave is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add nwave-ai/nwave/nw-ddd-eventsourcing@git:20260406.b65a761Pins git:20260406.b65a761 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- nwave-ai/nwave
- Path
nWave/skills/nw-ddd-eventsourcing/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260406.b65a761, committed Apr 6, 2026
- Size
- 8,057 bytes
- Repository stars
- 633
- License
- MIT
Event Sourcing and CQRS as DDD implementation patterns — when to use, aggregate event streams, projections, snapshots, sagas, upcasting, conflict resolution.
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 Sourcing and CQRS
Implementation patterns for DDD. Event Sourcing stores every state change as an immutable event and derives current state from replay. CQRS separates write and read models. These are tools, not mandatory architecture -- apply selectively to domains where they add value.
## When to Use Event Sourcing
**ES adds value when**:
- Complete audit trail required (financial, regulatory, medical)
- Temporal queries needed ("what was the state on January 15?")
- Multiple views of same data (different read models for different consumers)
- Complex domain with rich business rules (natural fit with DDD aggregates)
- Event-driven integration with other systems
- Debugging requires replay ("what exactly happened?")
**ES is overkill when**:
- Simple CRUD with no audit requirements
- Team unfamiliar and project has no learning budget
- No business value from history
- Domain has no behavior (data in, data out)
**Key question**: "Does knowing the history of how we got here provide business value?" Yes -> consider ES. No -> traditional CRUD is simpler.
## Core Concepts
### Events as Facts
…Read the whole file at its exact version.
How to install
mdr add nwave-ai/nwave/nw-ddd-eventsourcing@sha256:def99ce43e0432beThe line at the top of this page pins the label git:20260406.b65a761, 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.
[](https://markdownregistry.com/a/art_arejndo7fcdzt4i5)
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Versions
The registry has recorded 1 version of this file, committed on Apr 6, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
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- 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
nwave-ai/nwave · 633 stars · license MIT · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_arejndo7fcdzt4i5 GET https://markdownregistry.com/api/v1/resolve?ref=nwave-ai/nwave/nw-ddd-eventsourcing GET https://markdownregistry.com/api/v1/blob/def99ce43e0432befcc7ee704b7e9a18bcdb794f615eec9adb919ed066964f94
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.