ab-test-setup SKILL.md skillA
ab-test-setup from kevinzai/commander is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add kevinzai/commander/ab-test-setup@git:20260323.acfb436Pins git:20260323.acfb436 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- kevinzai/commander
- Path
skills/ab-test-setup/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260323.acfb436, committed Mar 23, 2026
- Size
- 4,944 bytes
- Repository stars
- 6
- 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
mdr add kevinzai/commander/ab-test-setup@sha256:a85bc3a172eafd57The line at the top of this page pins the label git:20260323.acfb436, 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_5zd6mj6nildz7psa)
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Versions
The registry has recorded 1 version of this file, committed on Mar 23, 2026.
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 (4944 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
kevinzai/commander · 6 stars · license MIT · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_5zd6mj6nildz7psa GET https://markdownregistry.com/api/v1/resolve?ref=kevinzai/commander/ab-test-setup GET https://markdownregistry.com/api/v1/blob/a85bc3a172eafd579dfece60ac09d88c25f3ef8ba74b28c9d649276bc6ae2bc2
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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