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metamorphic-testing SKILL.md skillA

metamorphic-testing from andreibesleaga/gabbe is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add andreibesleaga/gabbe/metamorphic-testing@git:20261014.de0823c

Pins git:20261014.de0823c in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: andreibesleaga/gabbe
Path: plugins/gabbe-coding/skills/metamorphic-testing/SKILL.md
Versions recorded: 1
Latest version: git:20261014.de0823c, committed Oct 14, 2026
Size: 8,072 bytes
Repository stars: 23
License: a license file GitHub does not identify

Test systems with no reliable oracle using metamorphic relations — equivalence-preserving input transforms whose outputs must agree, with concrete relations for LLM/NLP stability. Use when: test without a correct answer oracle, write metamorphic relations, check paraphrase invariance, test llm output stability, build a metamorphic relation suite, bypass the oracle problem.

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

# Metamorphic Testing

## Goal
Test systems where you cannot say what the *single correct output* is — the oracle problem.
You often can't assert "the model's answer to this question is X", but you *can* assert that
two related inputs must produce related outputs. A *metamorphic relation* (MR) is exactly that:
a transformation of the input paired with the expected relationship between the outputs. If you
reword a question without changing its meaning, a robust system should give an equivalent
answer; if it doesn't, you found a bug without ever knowing the "right" answer. This skill
produces a **metamorphic relation suite** — a set of MRs, especially for LLM/NLP stability,
where exact-match oracles are impossible. Like property-based testing, MT samples and raises
confidence; it does not prove.

## Steps
1. **Identify the oracle gap.** Confirm there is no cheap, reliable way to know the exact
   correct output (typical for ML/LLM/NLP, scientific computation, rendering, search ranking).
   If a real oracle exists, use a direct assertion or `pbt-strategy.skill` instead — MT is for
   when it does not.
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add andreibesleaga/gabbe/metamorphic-testing@sha256:624fd8cffd0ee433

The line at the top of this page pins the label git:20261014.de0823c, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_us2ipnki6wsnw3va.svg)](https://markdownregistry.com/a/art_us2ipnki6wsnw3va)

0 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Oct 14, 2026.

version	committed	commit	size	audit
git:20261014.de0823c latest	2026-10-14	de0823c	8,072 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (8072 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

GitHub

andreibesleaga/gabbe · 23 stars · license a license file GitHub does not identify · pushed 2026-11-02 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_us2ipnki6wsnw3va
GET https://markdownregistry.com/api/v1/resolve?ref=andreibesleaga/gabbe/metamorphic-testing
GET https://markdownregistry.com/api/v1/blob/624fd8cffd0ee433a6b86418439d00c794207593432419815d411fff4e0a9229

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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