Define Hypothesis
product-on-purpose/pm-skills
Defines a testable hypothesis with clear success metrics and a validation approach.
Write a hypothesis, define success metrics, and plan a holdout strategy.
Install Craft Experiment Design
$ npx skills add amplitude/builder-skills --skill craft-experiment-design -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install amplitude/builder-skills craft-experiment-design --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/amplitude/builder-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/product-skills/skills/craft-experiment-design .claude/skills/craft-experiment-design && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "craft-experiment-design" agent skill from https://github.com/amplitude/builder-skills/tree/main/product-skills/skills/craft-experiment-design into .claude/skills/craft-experiment-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "craft-experiment-design", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/amplitude/builder-skills/tree/main/product-skills/skills/craft-experiment-designType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add amplitude/builder-skills --skill craft-experiment-design -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install amplitude/builder-skills craft-experiment-design --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/amplitude/builder-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/product-skills/skills/craft-experiment-design .agents/skills/craft-experiment-design && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "craft-experiment-design" agent skill from https://github.com/amplitude/builder-skills/tree/main/product-skills/skills/craft-experiment-design into .agents/skills/craft-experiment-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "craft-experiment-design", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add amplitude/builder-skills --skill craft-experiment-design -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install amplitude/builder-skills craft-experiment-design --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/amplitude/builder-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/product-skills/skills/craft-experiment-design .cursor/skills/craft-experiment-design && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "craft-experiment-design" agent skill from https://github.com/amplitude/builder-skills/tree/main/product-skills/skills/craft-experiment-design into .cursor/skills/craft-experiment-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "craft-experiment-design", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/amplitude/builder-skills.git --path product-skills/skills/craft-experiment-design--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add amplitude/builder-skills --skill craft-experiment-design -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install amplitude/builder-skills craft-experiment-design --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/amplitude/builder-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/product-skills/skills/craft-experiment-design .gemini/skills/craft-experiment-design && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "craft-experiment-design" agent skill from https://github.com/amplitude/builder-skills/tree/main/product-skills/skills/craft-experiment-design into .gemini/skills/craft-experiment-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "craft-experiment-design", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install amplitude/builder-skills craft-experiment-designInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add amplitude/builder-skills --skill craft-experiment-design -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/amplitude/builder-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/product-skills/skills/craft-experiment-design .github/skills/craft-experiment-design && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "craft-experiment-design" agent skill from https://github.com/amplitude/builder-skills/tree/main/product-skills/skills/craft-experiment-design into .github/skills/craft-experiment-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "craft-experiment-design", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add amplitude/builder-skills --skill craft-experiment-design -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install amplitude/builder-skills craft-experiment-design --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/amplitude/builder-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/product-skills/skills/craft-experiment-design .opencode/skills/craft-experiment-design && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "craft-experiment-design" agent skill from https://github.com/amplitude/builder-skills/tree/main/product-skills/skills/craft-experiment-design into .opencode/skills/craft-experiment-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "craft-experiment-design", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
craft-experiment-design- GitHub stars
- 160
- Token cost
- ~522 tokens
- SKILL.md length
- 94 words
- Files
- 1
- Skills in repo
- 61
- Repo updated
- First seen
- Licence
- None found
At a glance
Write a hypothesis, define success metrics, and plan a holdout strategy.
- Designing A/B tests
- SKILL.md covers Prompt Template and Tips
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Experiment plans
What it does
Craft Experiment Design is an agent skill from amplitude/builder-skills. Write a hypothesis, define success metrics, and plan a holdout strategy. Use when designing A/B tests or experiment plans.
Its SKILL.md is about 520 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Research & Science, covering Experimental design, A/B testing and Product metrics. The repository describes itself as: Open-source AI skills for product managers — battle-tested by PMs at Amplitude.
When your agent uses it
- Designing A/B tests
- Experiment plans
Example prompts
- “/craft-experiment-design”
What it can do on your machine
Read from SKILL.md and the folder at commit 51838c2. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Craft Experiment Design loads about 522 tokens when it runs. Until then it costs about 37 tokens; SKILL.md has 94 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 94 words (~522 tokens).
“Write a hypothesis, define success metrics, and plan a holdout strategy.”
- name
- craft-experiment-design
- suggest_when
- User wants to test something, says "A/B test", "experiment", "should we test this", "hypothesis", or is planning a holdout strategy for a feature launch.
Files
Just SKILL.md in product-skills/skills/craft-experiment-design of amplitude/builder-skills.
Open the folder on GitHubat commit 51838c2
Compare with similar skills
Craft Experiment Design next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Craft Experiment Design this skillamplitude/builder-skills | 160 | — | ~522 | Automated safety check: Pass | None | |
| Define Hypothesisproduct-on-purpose/pm-skills | 715 | — | ~966 | Automated safety check: Pass | Apache-2.0 | |
| Measure Experiment Designproduct-on-purpose/pm-skills | 715 | — | ~1.1k | Automated safety check: Pass | Apache-2.0 | |
| Ab Testingericrisco/rsc-harness | 174 | — | ~2.4k | Automated safety check: Pass | MIT | |
| Hypothesis Testerjeremylongshore/tons-of-skills-marketplace | 2.8k | — | ~2.6k | Automated safety check: Pass | MIT | |
| Experiment Designermohitagw15856/pm-claude-skills | 1.4k | — | ~1.1k | Automated safety check: Pass | MIT |
Similar skills
Measure Experiment Design
product-on-purpose/pm-skills
Designs an A/B test or experiment with variants, success metrics, sample size, and duration for an existing hypothesis.
Ab Testing
ericrisco/rsc-harness
A skill your agent uses when designing or analyzing a controlled experiment — falsifiable hypothesis, sample size from an MDE, reading significance/CI/power, CUPED, or rescuing tests that won't go…
Hypothesis Tester
jeremylongshore/tons-of-skills-marketplace
Structured hypothesis formulation, experiment design, and results interpretation for Product Managers.
Experiment Designer
mohitagw15856/pm-claude-skills
Design statistically rigorous A/B tests and interpret experiment results.
Data Scientist
magnus919/hermes-profiles
PhD-level expertise in data science, statistics, and machine learning.
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Related
Questions about Craft Experiment Design
What does Craft Experiment Design do?
Write a hypothesis, define success metrics, and plan a holdout strategy. Craft Experiment Design is an agent skill from amplitude/builder-skills. Write a hypothesis, define success metrics, and plan a holdout strategy.
When should I use Craft Experiment Design?
Craft Experiment Design fits situations like: designing A/B tests; experiment plans.
How do I install Craft Experiment Design in Claude Code?
Run `npx skills add amplitude/builder-skills --skill craft-experiment-design -a claude-code`. Or copy the skill folder (product-skills/skills/craft-experiment-design in amplitude/builder-skills) into .claude/skills/craft-experiment-design in your project. Claude Code loads it when a task matches its description.
How do I install Craft Experiment Design in Codex?
Run `npx skills add amplitude/builder-skills --skill craft-experiment-design -a codex`. Or copy the skill folder (product-skills/skills/craft-experiment-design in amplitude/builder-skills) into .agents/skills/craft-experiment-design in your project. Codex loads it when a task matches its description.
Can I use Craft Experiment Design in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add amplitude/builder-skills --skill craft-experiment-design -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/craft-experiment-design, .gemini/skills/craft-experiment-design, .github/skills/craft-experiment-design and .opencode/skills/craft-experiment-design in your project.
What does Craft Experiment Design need to run?
SKILL.md names no scripts, command-line tools or credentials: Craft Experiment Design is instructions for the agent only.
Does Craft Experiment Design access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Craft Experiment Design safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Craft Experiment Design use?
No licence was found for Craft Experiment Design or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Craft Experiment Design use?
About 522 tokens (SKILL.md is roughly 2.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Craft Experiment Design?
Skills that share tags, products or a category with Craft Experiment Design: Define Hypothesis (product-on-purpose/pm-skills, 715 stars), Measure Experiment Design (product-on-purpose/pm-skills, 715 stars), Ab Testing (ericrisco/rsc-harness, 174 stars) and Hypothesis Tester (jeremylongshore/tons-of-skills-marketplace, 2.8k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Craft Experiment Design?
amplitude (a GitHub organization) maintains it in amplitude/builder-skills, which has 160 GitHub stars. The repository holds 61 skills in this directory. The repository was last updated on July 24, 2026.
Source: amplitude/builder-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.