immutability SKILL.md skillA
immutability from arcanada-one/datarim is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add arcanada-one/datarim/immutability@git:20261019.845c299Pins git:20261019.845c299 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- arcanada-one/datarim
- Path
skills/immutability/SKILL.md- Versions recorded
- 3
- Latest version
- git:20261019.845c299, committed Oct 19, 2026
- First version recorded
- Oct 4, 2026
- Size
- 23,688 bytes
- Repository stars
- 16
- License
- MIT
Immutability contract for all pipeline stages: artefact freeze, V-AC parity, non-code parity, anti-tautological rule, and return-to-source transition.
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
# Immutability — Pipeline Artefact Contract > **Authority:** RFC 2119 keywords (MUST / MUST NOT / SHOULD / MAY) apply > throughout. Foundation: Design by Contract (Meyer, 1986) — preconditions > and postconditions are non-negotiable specifications. ADRs (Nygard, 2011) > — accepted decisions are immutable; changes are made by superseding, not > editing. Configuration Management (IEEE 828-2012) — a baseline changes > only through formal change control procedures. ## Purpose This skill defines the immutability contract for every Datarim pipeline stage. An artefact produced by a stage MUST NOT be weakened to accommodate a constraint discovered in a downstream stage. When a genuine constraint makes an artefact unsatisfiable, the Return-to-Source Transition provides the formal revision path. ## Loading Loaded by every pipeline command (`dr-prd`, `dr-plan`, `dr-design`, `dr-do`, `dr-qa`, `dr-compliance`) and by the `architect` and `developer` agents. Frontend-UI tasks additionally load the `## Frontend-UI Rules` fragment. Each command reads the section matching its stage. The general section and common rules are always loaded; per-stage fragments are loaded …
Read the whole file at its exact version.
How to install
mdr add arcanada-one/datarim/immutability@sha256:300d4a25c4b15d5fThe line at the top of this page pins the label git:20261019.845c299, 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_js6bn4lxeeg65kfx)
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Versions
The registry has recorded 3 versions of this file, between Oct 4, 2026 and Oct 19, 2026, about one every 8 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261019.845c299 latest | 2026-10-19 | 845c299 | 23,688 B | A | view · diff |
| git:20261018.237bb97 | 2026-10-18 | 237bb97 | 23,317 B | A | view · diff |
| git:20261004.8dfccd1 | 2026-10-04 | 8dfccd1 | 21,215 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 (23688 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
arcanada-one/datarim · 16 stars · license MIT · pushed 2026-10-29 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_js6bn4lxeeg65kfx GET https://markdownregistry.com/api/v1/resolve?ref=arcanada-one/datarim/immutability GET https://markdownregistry.com/api/v1/blob/300d4a25c4b15d5feb1acdb170dbc8f97b7291860e993a3151db8102fbe593e9
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.