Claude for market sizing, done properly.
The tested prompt, the codes that help, and the setup strategy pros run. Copy, adapt, ship.
Market sizing is required for fundraising and strategy but most estimates are either absurdly inflated ('$50B TAM!') or too vague to be useful for planning.
Three reasons this actually lands.
The prompt, the codes, the fit. Each one on its own is a nice-to-have. Together, they change the workflow.
One tested prompt, copy-paste ready. Rules baked in, placeholders marked, tone locked down. No prompt-engineering trial runs, no back-and-forth.
Prefix with REASON, V=2 for compound effects. Each code is a documented technique, not a magic word.
Tuned for strategy workflows. Not a generic template, and not another "you are a helpful assistant" hack.
Without the pattern vs with it.
What the day looks like when you keep winging the prompt, and what it looks like when you stop.
Generic prompt. Claude writes something that could be about anyone, in any industry, from anywhere. Sounds like a template because it is one.
The CLSkills prompt with placeholders for your context. Claude writes it like a specialist who actually knows the work. Publishable after one edit pass.
You paste, Claude answers, you rewrite, you paste again. Ten minutes of back-and-forth per output. Three hours across a batch of five.
Prompt loaded once. You feed the specifics, Claude returns the finished output. Two minutes per, twenty across five. Same tone, same structure, every time.
Middle-of-the-road copy that reads AI-flavoured. Recipients notice. Response rates stay low. You end up rewriting most of it anyway.
A credible market sizing with transparent assumptions. Both top-down and bottom-up approaches with three scenarios. Investors can actually trust these numbers because you showed your work.
Copy this, replace the placeholders, ship.
Size the market for [PRODUCT/SERVICE]. What it does: [DESCRIPTION] Target customer: [WHO SPECIFICALLY] Geography: [MARKETS YOU'RE TARGETING] Price point: [WHAT YOU CHARGE] Calculate using both approaches: 1. **Top-down**: Start with industry size → narrow to your segment 2. **Bottom-up**: Number of potential customers × what they'd pay × purchase frequency For each approach, show: - The math step by step - Sources or assumptions for each number (be explicit about what's estimated vs. sourced) - Conservative, moderate, and aggressive scenarios Present: - TAM (Total Addressable Market) - SAM (Serviceable Addressable Market) - SOM (Serviceable Obtainable Market — what you can realistically capture in 3 years) Flag where the top-down and bottom-up numbers diverge and what that means.
Replace the [BRACKETED] placeholders with your context.
Stack these prefixes for compound gains.
Prepend one or more of these to the prompt above. Each code is documented on its own page with before and after examples.
Every prompt, once.
The Cheat Sheet is every tested code, with a before and an after.