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Get Started Free →Use this skill when planning a side project, evaluating a product idea, scoping an MVP, thinking through monetization, or deciding what to build. Trigger on keywords: side project, MVP, product idea, monetize, build vs buy, startup idea, indie hacker, what should I build, validate idea.
| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-02 | ✗→✓ | ▲ Improved | 30% | 0% |
| case-16 | ✗→✓ | ▲ Improved | 44% | 0% |
| case-19 | ✗→✓ | ▲ Improved | 34% | 0% |
| case-03 | ✓→✗ | ▼ Worse | 31% | 0% |
| case-04 | ✓→✗ | ▼ Worse | 23% | 0% |
Build the smallest thing that proves the core assumption.
Most side projects fail not because of bad execution but because of unvalidated assumptions. The goal of an MVP is to test the riskiest assumption with the least effort.
Before writing a line of code:
1. PROBLEM: Is this a real problem people have?
- Talk to 5 potential users — do they describe this problem unprompted?
2. SOLUTION FIT: Does your solution actually solve it?
- Can you describe it in one sentence they immediately understand?
3. WILLINGNESS TO PAY: Will people pay for it?
- "Would you pay $X/month for this?" is very different from "Would you use this?"
4. DIFFERENTIATION: Why this, not the existing alternatives?
- What's 10x better than what exists?
5. REACHABILITY: Can you reach the target users?
- Do you know where they are? Reddit, Slack, conferences, Twitter?For each feature, ask:
Before building the full system, manually do what the software would do:
| Model | Best When | Risk | |---|---|---| | Freemium | High volume, viral potential | Need large base for conversion | | Subscription | Recurring value, ongoing use | Churn management | | Usage-based | Variable usage patterns | Revenue unpredictability | | One-time | Simple tools, no ongoing cost | No recurring revenue | | B2B SaaS | Enterprise buyers, high value | Long sales cycles |
Build when:
Buy/use existing when:
Before investing more time in a side project:
For your specific AI side project idea:
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