principle-model-the-domain SKILL.md skillA

This file is byte-identical to the first copy the registry indexed, one of 4 indexed copies. Same content hash, so the same checks give both the same grade.

principle-model-the-domain from nightly-labs/openbot is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

mdr add nightly-labs/openbot/principle-model-the-domain@git:20261013.9e6954c

Pins git:20261013.9e6954c in mdr.lock. Pin the fingerprint instead.

Audit grade

A, 17 of 17 checks passed

Kind

SKILL.md skill

Repository

nightly-labs/openbot

Path

marketplace/production-catalog/bundles/pstack/skills/principle-model-the-domain/SKILL.md

Versions recorded

1

Latest version

git:20261013.9e6954c, committed Oct 13, 2026

Size

1,858 bytes

Repository stars

5,267

License

a license file GitHub does not identify

Apply when writing stateful logic, or when code branches a lot or repeats a shape assumption across files.

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

# Model the Domain

Encode the real domain in a data structure instead of scattering it across conditionals. A structure that matches the domain makes invalid states unrepresentable and deletes branches. Choosing it at write time is cheap. Recovering it later reads as a refactor and gets deferred.

Reach for:

- A state machine instead of scattered booleans, phases, or lifecycle checks.
- A typed model instead of loose parameters or repeated shape assumptions.
- A map, registry, lookup table, or discriminated union instead of branching spread across files.
- A reducer or command/event model instead of ad hoc state mutations.
- A module organized around one body of domain knowledge instead of a sequence such as load, validate, transform, and save. Execution order is not ownership.
- A small module boundary that gathers repeated behavior, ownership, or invariants.
- A queue, cache, index, graph, tree, or normalized collection where the access pattern calls for it.
- Any other structure that fits. When none fits, work out what the code must never allow and how the data gets read, then find the structure that encodes exactly that.
…

Read the whole file at its exact version.

How to install

mdr add nightly-labs/openbot/principle-model-the-domain@sha256:52c0d85e0c3827c4

[![mdr](https://markdownregistry.com/badge/art_imavfomluuazm3ly.svg)](https://markdownregistry.com/a/art_imavfomluuazm3ly)

Versions

The registry has recorded 1 version of this file, committed on Oct 13, 2026.

Audit of the latest version

Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_imavfomluuazm3ly
GET https://markdownregistry.com/api/v1/resolve?ref=nightly-labs/openbot/principle-model-the-domain
GET https://markdownregistry.com/api/v1/blob/52c0d85e0c3827c41c18299b642657d7b47eaf77b7b31609e42e0df42b84c75f

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.

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