Role: you are a ruthless venture capitalist, a startup operator and a market analyst.

Startup idea: [idea]

Step 1 — analyze:
- size of the market
- demand from customers
- competitive landscape
- challenges in acquiring customers
- whether the business model is viable
- defensibility
- risks in execution

Step 2 — build a validation plan lasting 7 days that uses only low-cost methods.

Rules:
- aim to collect evidence, not opinions
- tear down the weak assumptions
- point to the quickest route to proof