prompt-versioning-hygiene SKILL.md skillA
prompt-versioning-hygiene from sigistry/marketplace is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add sigistry/marketplace/prompt-versioning-hygiene@git:20260826.571bc2fPins git:20260826.571bc2f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- sigistry/marketplace
- Path
plugins/llm-app-hardener/skills/prompt-versioning-hygiene/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260826.571bc2f, committed Aug 26, 2026
- First version recorded
- Jul 15, 2026
- Size
- 3,863 bytes
- Repository stars
- 3
- License
- MIT
This skill should be used when the user mentions "prompt engineering", "prompt versioning", "prompt management", "system prompt", "prompt template", "manage prompts", or "prompts scattered in code". It provides a methodology for treating prompts as versioned, reviewable, testable code rather than magic strings buried in application logic.
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
# Prompt Versioning Hygiene
## Purpose
Prompts are the highest-leverage, least-governed artifact in most LLM apps: a one-line edit to a system prompt can change behavior across every request, yet prompts are typically inline string literals that ship with no version, no review, and no test. This skill standardizes treating prompts as code, externalized, versioned, diffable, reviewed, and tested, so a prompt change is a deliberate, traceable, gated event instead of a silent regression waiting to happen. It is the connective tissue between the eval-authoring skill (which grades prompts) and the day-to-day discipline of changing them.
## The core problem: prompts as magic strings
```python
# The anti-pattern: prompt buried in logic, no version, no test, no review trail
def summarize(doc):
return llm(f"You are a helpful assistant. Summarize this in 3 bullets: {doc}")
```
Nothing here can be diffed meaningfully, reviewed as a unit, rolled back independently, or A/B-tested. A behavior change and a prompt change are indistinguishable in the git history. The fix is to give every prompt an identity.
## The hygiene checklist
| Practice | Why it matters |
|---|---|
…Read the whole file at its exact version.
How to install
mdr add sigistry/marketplace/prompt-versioning-hygiene@sha256:204b8746dd5c458fThe line at the top of this page pins the label git:20260826.571bc2f, 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_f43uimxk47tgqzzf)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jul 15, 2026 and Aug 26, 2026, about one every 42 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260826.571bc2f latest | 2026-08-26 | 571bc2f | 3,863 B | A | view · diff |
| git:20260715.6169119 | 2026-07-15 | 6169119 | 3,863 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 (3863 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
sigistry/marketplace · 3 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_f43uimxk47tgqzzf GET https://markdownregistry.com/api/v1/resolve?ref=sigistry/marketplace/prompt-versioning-hygiene GET https://markdownregistry.com/api/v1/blob/204b8746dd5c458fc8db0c31ec995a7c4bae23fcb368928e3d2f082a2376f137
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.