experimentation SKILL.md skillA
experimentation from cbrock84/headcount is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add cbrock84/headcount/experimentation@git:20260916.e72e404Pins git:20260916.e72e404 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- cbrock84/headcount
- Path
plugins/demand-generation/skills/experimentation/SKILL.md- Versions recorded
- 4
- Latest version
- git:20260916.e72e404, committed Sep 16, 2026
- First version recorded
- Aug 28, 2026
- Size
- 3,893 bytes
- Repository stars
- 2,543
- License
- MIT
Designs, runs, and reads A/B tests and growth experiments — hypothesis, sample size, duration, and honest interpretation. Use this to plan a test, judge whether a result is real, build an experimentation program, decide what to test next, or diagnose why tests keep producing inconclusive or non-replicating results.
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
# Experimentation Most A/B testing programs produce confident conclusions from insufficient data. The discipline is almost entirely in what you do before launch. ## Before running - **Hypothesis with a mechanism.** "Moving the pricing table above the fold will raise trial starts, because visitors currently leave before seeing pricing." Not "let's try a green button." - **One primary metric**, chosen in advance. Secondary metrics are context, never the verdict. - **Sample size calculated in advance**, from your baseline rate and the smallest lift that would change a decision. If the required sample is unreachable, do not run the test — decide by judgment and say so. - **Duration set in advance**, covering at least one full weekly cycle, and two if the buying cycle is long. - **Guardrail metrics** that would make you reject a win: refunds, support volume, downstream retention. ## While running Do not look at results and act on them mid-flight. Peeking and stopping at significance is the single most common way to generate false positives, and it is very effective at it. Check only that the test is running correctly — even split, no broken variant, tracking firing. …
Read the whole file at its exact version.
How to install
mdr add cbrock84/headcount/experimentation@sha256:1112191cd4bb33f2The line at the top of this page pins the label git:20260916.e72e404, 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_bjxncyzfowck5nla)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Aug 28, 2026 and Sep 16, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260916.e72e404 latest | 2026-09-16 | e72e404 | 3,893 B | A | view · diff |
| git:20260901.49e89d6 | 2026-09-01 | 49e89d6 | 3,554 B | A | view · diff |
| git:20260901.b973f20 | 2026-09-01 | b973f20 | 2,897 B | A | view · diff |
| git:20260828.f80dcb5 | 2026-08-28 | f80dcb5 | 2,462 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 (3893 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
cbrock84/headcount · 2,543 stars · license MIT · pushed 2026-10-18 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_bjxncyzfowck5nla GET https://markdownregistry.com/api/v1/resolve?ref=cbrock84/headcount/experimentation GET https://markdownregistry.com/api/v1/blob/1112191cd4bb33f284ecd70aa5a76e5eeaae28433b63df6426cabaafa24cd66b
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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