Defines right metrics using North Star framework, AARRR, and leading vs lagging indicators. Use when choosing metrics, instrumenting products, creating dashboards, or distinguishing vanity metrics from actionable ones.
Claude uses this skill when:
Definition:
The ONE metric that best captures the core value you deliver to customers
Good North Star:
Examples:
Pirate Metrics:
# Metrics Dashboard: [Product/Feature]
## North Star Metric
**Metric:** [name]
**Current:** [value]
**Target:** [goal]
**Why this metric:** [captures core value]
## Supporting Metrics
### Acquisition
- Signups: [X per day]
- Channels: [breakdown]
- Cost per acquisition: [$X]
### Activation
- Activation rate: [X]%
- Time to first value: [X minutes]
### Retention
- Day 1: [X]%
- Day 7: [X]%
- Day 30: [X]%
### Revenue
- ARPU: [$X]
- LTV: [$X]
- Conversion rate: [X]%
### Referral
- K-factor: [X]
- Referral rate: [X]%
## Leading vs Lagging
**Leading (predict future):**
- [Metric that predicts outcome]
**Lagging (measure past):**
- [Metric that measures result]
Choose Metrics:
Implement:
Amplitude:
"The best metrics measure value delivery, not just activity."
Sean Ellis:
"If you can't measure it, you can't improve it."