Agent skill

Validate Market

by tamdogood in tamdogood/builder-essential-skills

Run an honest market-fit and viability audit of any project or idea and produce a decision doc, not code.

MITAuto-check: notes

Install Validate Market

skills CLI
$ npx skills add tamdogood/builder-essential-skills --skill validate-market -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install tamdogood/builder-essential-skills validate-market --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/tamdogood/builder-essential-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/validate-market .claude/skills/validate-market && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
validate-market
GitHub stars
221
Token cost
~2.8k tokens
SKILL.md length
1,556 words
Files
2
Skills in repo
18
Repo updated
First seen
Licence
MIT

At a glance

Run an honest market-fit and viability audit of any project or idea and produce a decision doc, not code.

  • Works in 7 steps: Ground truth before opinion → Problem and wedge → Landscape research → …
  • Someone asks is this viable as a business
  • SKILL.md covers Posture (non-negotiable), Phase 0: Ground truth before…, Phase 1: Problem and wedge and Phase 2: Landscape research, plus 5 more sections
  • Calls gh and codex

What it does

Validate Market is an agent skill from tamdogood/builder-essential-skills. 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 criteria and a…

Its SKILL.md is about 2.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `README.md`). Compatibility notes: claude-code

The repository describes itself as: A repository for skills that are essential to my daily work. The licence is MIT.

When your agent uses it

  • Someone asks is this viable as a business
  • Audit the market fit
  • Make the case and compare to competitors
  • Should I apply to YC

Example prompts

  • “is this viable as a business”
  • “audit the market fit”
  • “make the case and compare to competitors”
  • “/validate-market”

Requirements

  • Compatibility (from SKILL.md): claude-code
  • Pre-approved tools (allowed-tools): Read, Write, Edit, Grep, Glob, Bash, WebSearch, WebFetch, Agent, AskUserQuestion

Workflow steps

7 steps, taken from the step headings in SKILL.md.

  1. Ground truth before opinion
  2. Problem and wedge
  3. Landscape research
  4. Premises
  5. Independent cold read
  6. Write the doc
  7. Adversarial review loop

What it can do on your machine

Read from SKILL.md and the folder at commit 1be9984. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Write
    • Edit
    • Grep
    • Glob
    • Bash
    • WebSearch
    • WebFetch
    • Agent
    • AskUserQuestion

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • gh
    • codex

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use gh, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    claude-code

    From compatibility in the SKILL.md frontmatter.

Context cost

Validate Market loads about 2.8k tokens when it runs. Until then it costs about 151 tokens; SKILL.md has 1,556 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~151
When it runs · the whole SKILL.md, loaded when a task matches
~2.8k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Write, Edit, Grep, Glob, Bash, WebSearch, WebFetch, Agent, AskUserQuestion

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from tamdogood/builder-essential-skills at commit 1be9984, republished under its MIT licence (© tamdogood). 1,556 words, ~2,792 tokens.

Download SKILL.mdSave it as .claude/skills/validate-market/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
validate-market
description
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 criteria and a concrete week-1 assignment, then hardens it with an adversarial review loop.
allowed-tools
Read, Write, Edit, Grep, Glob, Bash, WebSearch, WebFetch, Agent, AskUserQuestion
compatibility
claude-code

Validate a project / market

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.

Posture (non-negotiable)

  • Interest is not demand. Stars, waitlists, compliments, and "that's interesting" count for nothing. Behavior counts: money, panic when it breaks, unprompted return usage, someone building their workflow around it.
  • The status quo is competitor #1. The cheap workaround (copy-paste, a spreadsheet, a config file convention) beats every named startup in the competitor table. Always list it first and price what it costs the user today.
  • Take a position on everything. Never write "there are many ways to think about this" or "that could work". Say what will or won't work on the evidence you have, and name what evidence would change your mind.
  • Papercut vs bleeding wound. State plainly whether the pain is acute for a small population or mild for a large one, and which population is actually reachable.
  • Lead with the disconfirming evidence. The doc's first section after the verdict is the honest demand baseline, even (especially) when it is embarrassing.

Phase 0: Ground truth before opinion

Collect verifiable numbers before writing a single judgment. Do not skip this; it is what separates an audit from a vibe.

  • Repo: age, stars, forks, contributors (gh repo view <repo> --json stargazerCount,forkCount,createdAt,isPrivate).
  • Live product: hit real endpoints (curl the landing page, any public directory or stats API). Distinguish "deployed" from "used".
  • Any analytics, revenue, waitlist, install counts the user can show. Ask if not obvious.
  • Apply the bar: would anyone outside the project be upset if it disappeared tomorrow? Write the answer down. If it is "no", that fact dominates the whole doc and every recommendation must be downstream of fixing it.

Phase 1: Problem and wedge

  • State the problem in the founder's own words; quote them. The founder's phrasing usually reveals the wedge better than the pitch does.
  • Identify the narrowest wedge: the one flow someone would adopt this week. One sentence, verb first ("move X from A to B in 10 seconds"). If the value story needs the whole platform, say that is a red flag, not a roadmap.
  • Name the target user as a findable human: role, where they hang out, what they already pay for. "Developers" or "enterprises" is a filter, not a person.

Phase 2: Landscape research

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:

  1. Standards and platform state of the category ("<category> protocol landscape <year>").
  2. Funding and startups in the category ("<category> startups <year> funding").
  3. Direct adjacent products solving the same wedge ("<the wedge, described generically> tool").
  4. What incumbents absorbed recently ("<big platform> <category> features <year>").

Synthesize three things explicitly:

  • Who owns the lane the wedge sits in, and whether it is genuinely open.
  • Feature or company? Could a platform above (the IDE, the OS, the incumbent chat tool, the lab) absorb this in one release? Name the absorption clock honestly.
  • Is the timing argument already won? If the market no longer needs educating, that cuts both ways: no education cost, but the obvious framing is taken.

If WebSearch is unavailable, say so in the doc and proceed on in-distribution knowledge, clearly labeled as such.

Phase 3: Premises

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.

Phase 4: Independent cold read

Get a second opinion that has not seen your reasoning:

  • If 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.
  • Otherwise: dispatch a fresh subagent (Agent tool) with the same prompt. Fresh context is the point; do not paste your own conclusions.

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.

Show full SKILL.md (734 more words)Show less

Phase 5: Write the doc

Structure (adapt names, keep the order; verdict first, evidence before judgment):

  1. Header + verdict up front. One paragraph: is there a business here, what is the binding constraint, what to do next. No hedging.
  2. Problem statement.
  3. Demand evidence (the honest part). External evidence first, internal second, clearly separated. Include the "would anyone be upset?" answer.
  4. Status quo. The workarounds and what they cost. Papercut-or-wound verdict.
  5. Target user and narrowest wedge.
  6. Market and timing. The 2-4 numbers that matter, sourced.
  7. Competitive field. A table: player, what it is, overlap, real threat (with the status quo as row 1 and a one-line "why" in every threat cell). Then 1-3 structural observations, including the feature-vs-company question.
  8. Strengths. Only real, verifiable ones. "Founder-problem fit" counts; "great tech" only counts if it changes distribution or cost structure.
  9. Weaknesses and risks. Include the ones the founder will not enjoy reading (naming/trademark, platform absorption, solo-founder, undefined pricing). For each, say what to do about it and what it costs.
  10. Premises (from Phase 3, with the cold-read revision applied).
  11. Cross-model perspective (from Phase 4, positions preserved).
  12. Approaches considered. 2-3, always including a minimal validation sprint (weeks, near-zero cost, outreach-first) and usually a lateral repositioning. Effort, risk, pros, cons, what existing assets each reuses.
  13. Recommendation. Pick one. If the honest answer is "sequence, don't choose", give the sequence with dates.
  14. Business model sketch, explicitly deferred until after validation. Name the closest working analogy (e.g. the Tailscale playbook) rather than inventing tiers from nothing.
  15. Open questions, each with where its answer will come from.
  16. Success criteria: three bands, pre-committed (see rigor checklist below).
  17. The assignment. One concrete real-world action for this week. Not "go build"; an outreach or observation action with names and counts.
Rigor checklist for the pre-committed criteria

These are the holes adversarial review reliably finds. Close them before review:

  • Every branch has a consequence, including kill. "Kill (or re-frame)" is not a decision. Pass, middle, and kill each name the next action and its deadline.
  • Band precedence is explicit. Mixed results happen; say which band wins (e.g. "kill conditions are evaluated first").
  • Denominators are fixed. "Up to 100 asks" plus "fewer than 5 replies" is elastic; add a minimum-effort precondition ("kill is valid only if 80+ asks were sent, else the verdict is insufficient effort, extend one week").
  • Terms are defined. "Serious reply", "real conversation", "active user" each get one defining line where they are used as triggers.
  • Calendar math closes. If the recommendation targets an external deadline (a batch application, a launch window), the sprint end date plus writing time must land before it. Do the arithmetic in the doc.
  • Measurement exists. If a criterion needs instrumentation, verifying that instrumentation is a named week-1 task, with a self-report fallback.
  • Week 1 is schedulable. Cold outreach has reply latency; targets for week 1 are "scheduled", not "completed". State the founder-availability assumption (full-time vs nights-and-weekends) and give the part-time variant.
  • Outreach measures the market, not the founder's DM skills. Require 2+ channels and absolute count bars, not conversion rates.

Phase 6: Adversarial review loop

  1. Dispatch a fresh subagent (Agent tool) that reads only the doc, not this conversation. Have it review 5 dimensions: completeness (are all promised questions answered), consistency (do sections contradict, does the timeline survive its own calendar), clarity (could the founder act without asking anything), scope (audit only, no padding), feasibility (executable by this founder in the stated time). Ask for a numbered issue list and a 1-10 score. Tell it not to fact-check external market claims, only internal logic.
  2. Fix every real issue in the doc. Push back in the doc itself where the reviewer is wrong, do not silently drop findings.
  3. Re-dispatch once. Stop after two re-reviews or when new findings are cosmetic; record any surviving disagreements in the doc under "Reviewer concerns".
  4. Report to the user: rounds run, issues found and fixed, final score.

Closing

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.

© tamdogood, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in skills/validate-market of tamdogood/builder-essential-skills.

  • SKILL.md
  • README.md

Open the folder on GitHubat commit 1be9984

Compare with similar skills

Validate Market next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Validate Market compared with similar skills
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Validate Market this skilltamdogood/builder-essential-skills221—~2.8kAutomated safety check: NotesMIT
Table Fitasgeirtj/system_prompts_leaks69k—~772Automated safety check: PassCC0-1.0
Furniture Fit Checkpascalorg/editor25k—~5.1kAutomated safety check: PassMIT
Fitness Programrevfactory/harness-1001.3k—~1.8kAutomated safety check: PassApache-2.0
Fit Scoreraaron-he-zhu/aaron-marketing-skills2.9k—~4.2kAutomated safety check: PassApache-2.0
Business Name Fitalirezarezvani/claude-skills28k—~2.8kAutomated safety check: PassMIT

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Questions about Validate Market

What does Validate Market do?

Run an honest market-fit and viability audit of any project or idea and produce a decision doc, not code. Validate Market is an agent skill from tamdogood/builder-essential-skills. Run an honest market-fit and viability audit of any project or idea and produce a decision doc, not code.

When should I use Validate Market?

Validate Market fits situations like: someone asks is this viable as a business; audit the market fit; make the case and compare to competitors; should I apply to YC.

How do I install Validate Market in Claude Code?

Run `npx skills add tamdogood/builder-essential-skills --skill validate-market -a claude-code`. Or copy the skill folder (skills/validate-market in tamdogood/builder-essential-skills) into .claude/skills/validate-market in your project. Claude Code loads it when a task matches its description.

How do I install Validate Market in Codex?

Run `npx skills add tamdogood/builder-essential-skills --skill validate-market -a codex`. Or copy the skill folder (skills/validate-market in tamdogood/builder-essential-skills) into .agents/skills/validate-market in your project. Codex loads it when a task matches its description.

Can I use Validate Market in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add tamdogood/builder-essential-skills --skill validate-market -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/validate-market, .gemini/skills/validate-market, .github/skills/validate-market and .opencode/skills/validate-market in your project.

What does Validate Market need to run?

Going by SKILL.md and its folder, Validate Market needs the command-line tools its instructions call (gh and codex). Its frontmatter pre-approves these tools: Read, Write, Edit, Grep, Glob, Bash, WebSearch, WebFetch, Agent, AskUserQuestion. Compatibility (from SKILL.md): claude-code.

Does Validate Market access the network?

SKILL.md contains no URLs. Its commands use gh, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Validate Market safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Validate Market use?

Validate Market is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Validate Market use?

About 2.8k tokens (SKILL.md is roughly 11k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Validate Market?

Skills that share tags, products or a category with Validate Market: Table Fit (asgeirtj/system_prompts_leaks, 69k stars), Furniture Fit Check (pascalorg/editor, 25k stars), Fitness Program (revfactory/harness-100, 1.3k stars) and Fit Scorer (aaron-he-zhu/aaron-marketing-skills, 2.9k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Validate Market?

tamdogood (a GitHub user) maintains it in tamdogood/builder-essential-skills, which has 221 GitHub stars. The repository holds 18 skills in this directory. The repository was last updated on August 16, 2026.

Source: tamdogood/builder-essential-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.