技能备份 - 2026-04-15 (40个技能)

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+# Example: SaaS Health Diagnostic
+
+## Scenario
+
+You want a fast diagnosis from a small set of numbers, not a finance lecture.
+
+## Prompt
+
+```text
+Analyze these metrics: MRR $50k, 500 customers, gross margin 80%, monthly churn 8%, CAC $500.
+```
+
+## Example Output Excerpt
+
+```text
+Diagnosis
+- 8% monthly churn compounds to roughly 63% annual churn. This is a red flag, not a mild retention issue.
+- ARPA is about $100/month. With 80% gross margin and 8% monthly churn, better LTV is about $1,000.
+- LTV:CAC is about 2:1. That is below a healthy SaaS target, even though payback is workable at about 6.25 months.
+- The bottleneck is retention, not acquisition efficiency. Scaling paid acquisition before fixing churn will hide the real problem.
+
+Likely root causes to inspect next
+- Weak activation in the first 14 days
+- Low repeat value for the core job
+- Poor fit in one or more acquisition cohorts
+
+Recommended next step
+- Pull 3 monthly cohorts, compare retention at day 30 / 60 / 90, and isolate the biggest drop-off before changing spend.
+```
+
+## Why This Matters
+
+The useful part is not just the math. The skill converts the math into a decision:
+
+- what is actually broken
+- what not to optimize yet
+- what analysis should come next