Best for
- Use when someone asks "is this viable as a business", "audit the market fit", "make the case and compare to competitors", "should I apply to YC or bootstrap", or wants to validate a project, product, or market before in…
tamdogood/builder-essential-skills/skills/validate-market/SKILL.md
Run an honest market-fit and viability audit of any project or idea and produce a decision doc, not code. Use when someone asks "is this viable as a business", "audit the market fit", "make the case and compare to competitors", "should I apply to YC or bootstrap", or wants to validate a project, product, or market before investing more time. Gathers verifiable traction data first, researches the competitive field, gets an independent cold read, writes a doc with pre-committed pass/middle/kill cr
Decision brief
You are running a validation audit. The deliverable is one document that answers: is there a business here, who else is fighting for it, where are the openings, and what is the next concrete action. The audit exists to protect months of the founder's life, so honesty outranks en…
Compatibility matrix
| Platform | Status | Evidence | What to check |
|---|---|---|---|
| Codex | Not declared | No explicit evidence | Portability before use |
| Claude Code | Declared | Source record | Install path and trigger |
| Cursor | Not declared | No explicit evidence | Portability before use |
| Gemini CLI | Not declared | No explicit evidence | Portability before use |
Installation
The source command is displayed only when detected. A safe inspection prompt is always available so your agent can explain every action before execution.
npx skills add https://github.com/tamdogood/builder-essential-skills --skill "skills/validate-market"Inspect the Agent Skill "validate-market" from https://github.com/tamdogood/builder-essential-skills/blob/3bbbfb668959af812f3892537f263c64cedc12c4/skills/validate-market/SKILL.md at commit 3bbbfb668959af812f3892537f263c64cedc12c4. List every install step, command, network request, credential, file read/write, external action, and rollback step. Explain whether it fits my task. Do not install or execute anything until I approve.
Workflow
Collect verifiable numbers before writing a single judgment. Do not skip this; it is what separates an audit from a vibe.
State the problem in the founder's own words; quote them. The founder's phrasing
Use WebSearch with generalized category terms, never the product's name or any stealth details. Run at least these four searches and read the top results:
Write 3 to 5 premises the whole recommendation rests on. Mark each verified (with the evidence) or assumed (with how the founder would check it). Then attack the one you are most attached to yourself; if you cannot break it, say what external event would.
Get a second opinion that has not seen your reasoning:
Permission review
No configured static risk pattern was detected
This is not proof of safety. Runtime behavior, indirect dependencies, and hidden external systems are outside the static scan.
Evidence record
| Signal | Value | Evidence type | Meaning |
|---|---|---|---|
| Quality score | 93/100 | Computed | Documentation, specificity, maintenance, and trust rules |
| Repository stars | 88 | Source | Repository attention, not individual Skill quality |
| Compatibility | 1 platforms | Source | Declared in the catalog source record |
| Usage guide | automated source guide | Editorial | Generated or reviewed according to the visible evidence level |
Pinned source
You are running a validation audit. The deliverable is one document that answers: is there a business here, who else is fighting for it, where are the openings, and what is the next concrete action. The audit exists to protect months of the founder's life, so honesty outranks encouragement everywhere.
Hard gate: no implementation. No code, no scaffolding, no renames, no site changes.
The only output is the doc (plus its adversarial review). If the user asked for a doc in
a specific place, put it there; otherwise default to docs/research/<slug>-market-viability-audit.md
in a repo, or ./<slug>-market-viability-audit.md outside one.
Collect verifiable numbers before writing a single judgment. Do not skip this; it is what separates an audit from a vibe.
gh repo view <repo> --json stargazerCount,forkCount,createdAt,isPrivate).curl the landing page, any public directory or
stats API). Distinguish "deployed" from "used".Use WebSearch with generalized category terms, never the product's name or any stealth details. Run at least these four searches and read the top results:
Synthesize three things explicitly:
If WebSearch is unavailable, say so in the doc and proceed on in-distribution knowledge, clearly labeled as such.
Write 3 to 5 premises the whole recommendation rests on. Mark each verified (with the evidence) or assumed (with how the founder would check it). Then attack the one you are most attached to yourself; if you cannot break it, say what external event would.
Get a second opinion that has not seen your reasoning:
codex is on PATH: assemble a structured context block (product, stage and demand
evidence, founder's stated problem, landscape summary, premises) into a temp file and
run codex exec read-only against it with these asks: (1) steelman the strongest
version, (2) quote the one detail that reveals what to actually build, (3) name one
premise that is wrong and the evidence that would prove it, (4) a 48-hour plan with
channels, metrics, and kill criteria.In the doc, quote the cold read's sharpest challenge and state explicitly whether you adopt it (revise the premise) or contest it (and why). Silently agreeing with yourself is the failure mode this phase exists to prevent.
Structure (adapt names, keep the order; verdict first, evidence before judgment):
These are the holes adversarial review reliably finds. Close them before review:
End with, in the final message: the verdict in two sentences, the doc's location, the three-band decision rule, and the week-1 assignment. If the founder profile fits (real problem, domain expertise, agency), say so plainly and point at the relevant next step (accelerator application, design-partner outreach), but only when the evidence in the doc supports it. No congratulations for work the market has not yet validated.
Alternatives
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