Brainstorm Experiments Existing

Design experiments to test assumptions for an existing product — prototypes, A/B tests, spikes, and other low-effort validation methods. Use when validating assumptions, testing feature ideas cheaply, or planning product experiments.

27,559 stars 2,851 forksTesting & QA

Install

skills CLI (Claude Code, Cursor, Codex and more)
npx skills add phuryn/pm-skills --skill brainstorm-experiments-existing
Manual install
git clone --depth 1 https://github.com/phuryn/pm-skills.git /tmp/pm-skills
mkdir -p ~/.claude/skills
cp -r /tmp/pm-skills/pm-product-discovery/skills/brainstorm-experiments-existing ~/.claude/skills/brainstorm-experiments-existing

Personal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.

From the SKILL.md

## Design Experiments (Existing Product)

Design low-effort experiments to test product assumptions before committing to full implementation.

### Context

You are helping a product team design experiments for **$ARGUMENTS**. The team has a feature idea and assumptions that need validation.

If the user provides files (PRDs, assumption lists, designs), read them first.

### Instructions

The user will describe their idea and assumptions. Work through these steps:

1. **Clarify the idea and assumptions**: Confirm what the team wants to build and what they need to validate.

2. **Suggest experiments** for each assumption. Consider methods like:
   - First-click testing or task completion with a prototype
   - Feature stubs or fake door tests
   - Technical spikes
   - A/B tests on production (with risk mitigation)
   - Wizard of Oz approaches
   - Survey-based validation (behavioral, not opinion-based)

3. **Key principles to follow**:
   - Measure actual behavior, not users' opinions
   - Test responsibly — don't put users or the business at risk
   - For production tests (e.g., A/B tests), explain risk mitigation strategies
   - Aim for maximum validated learning with minimal effort

4. **For each experiment**, specify:
   - **Assumption**: What do we believe?
   - **Experiment**: What exactly will we do to validate it?
   - **Metric**: What will be measured?
   - **Success threshold**: The expected value if we are right
Read the full skill on GitHub

Details

Skill name
brainstorm-experiments-existing
Repository
phuryn/pm-skills
Path
pm-product-discovery/skills/brainstorm-experiments-existing/SKILL.md
License
MIT
Repo updated
29 October 2026
Listed in
heilcheng/awesome-agent-skills, skillmatic-ai/awesome-agent-skills, VoltAgent/awesome-agent-skills

FAQ

What does the Brainstorm Experiments Existing skill do?

Design experiments to test assumptions for an existing product — prototypes, A/B tests, spikes, and other low-effort validation methods. Use when validating assumptions, testing feature ideas cheaply, or planning product experiments.

How do I install the Brainstorm Experiments Existing skill?

skills CLI (Claude Code, Cursor, Codex and more): npx skills add phuryn/pm-skills --skill brainstorm-experiments-existing. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.

Is Brainstorm Experiments Existing popular?

It lives in phuryn/pm-skills, which has 27,559 GitHub stars and 2,851 forks, and is included in 3 curated skill lists.

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