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ab-test-setup SKILL.md skillA

ab-test-setup from ghosteken/agent-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add ghosteken/agent-harness/ab-test-setup@git:20260721.efafd9c

Pins git:20260721.efafd9c in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: ghosteken/agent-harness
Path: archive/skills-community/ab-test-setup/SKILL.md
Versions recorded: 1
Latest version: git:20260721.efafd9c, committed Jul 21, 2026
Size: 6,443 bytes
Repository stars: 4
License: MIT

Structured guide for setting up A/B tests with mandatory gates for hypothesis, metrics, and execution readiness.

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

# A/B Test Setup

## 1️⃣ Purpose & Scope

Ensure every A/B test is **valid, rigorous, and safe** before a single line of code is written.

- Prevents "peeking"
- Enforces statistical power
- Blocks invalid hypotheses

---

## 2️⃣ Pre-Requisites

You must have:

- A clear user problem
- Access to an analytics source
- Roughly estimated traffic volume

### Hypothesis Quality Checklist

A valid hypothesis includes:

- Observation or evidence
- Single, specific change
- Directional expectation
- Defined audience
- Measurable success criteria

---

## 3️⃣ Hypothesis Lock (Hard Gate)

Before designing variants or metrics, you MUST:

- Present the **final hypothesis**
- Specify:
  - Target audience
  - Primary metric
  - Expected direction of effect
  - Minimum Detectable Effect (MDE)

Ask explicitly:

> “Is this the final hypothesis we are committing to for this test?”

**Do NOT proceed until confirmed.**

---

## 4️⃣ Assumptions & Validity Check (Mandatory)

Explicitly list assumptions about:

- Traffic stability
- User independence
- Metric reliability
- Randomization quality
- External factors (seasonality, campaigns, releases)

If assumptions are weak or violated:

- Warn the user
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add ghosteken/agent-harness/ab-test-setup@sha256:2efff4de6ce3fa37

The line at the top of this page pins the label git:20260721.efafd9c, 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_4xd66qao6e2czcvh.svg)](https://markdownregistry.com/a/art_4xd66qao6e2czcvh)

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

Versions

The registry has recorded 1 version of this file, committed on Jul 21, 2026.

version	committed	commit	size	audit
git:20260721.efafd9c latest	2026-07-21	efafd9c	6,443 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 (6443 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

ghosteken/agent-harness · 4 stars · license MIT · pushed 2026-10-13 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_4xd66qao6e2czcvh
GET https://markdownregistry.com/api/v1/resolve?ref=ghosteken/agent-harness/ab-test-setup
GET https://markdownregistry.com/api/v1/blob/2efff4de6ce3fa37bb79f1956b0d6a0e6a7011888279089d7b7ea9cdb5966883

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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