Thinking Partner
mattnowdev/thinking-partner
A deterministic thinking partner that challenges assumptions and applies mental models to sharpen decisions, solve problems, and think more clearly.
Pressure-test a startup idea the way a sharp investor or co-founder would — problem, market, wedge, moat, why-now, and the fastest cheap way to test it.
Install Startup Idea Validator
$ npx skills add mohitagw15856/pm-claude-skills --skill startup-idea-validator -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install mohitagw15856/pm-claude-skills startup-idea-validator --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/startup-idea-validator .claude/skills/startup-idea-validator && rm -rf skills-srcUse ~/.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/
Install the "startup-idea-validator" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/startup-idea-validator into .claude/skills/startup-idea-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "startup-idea-validator", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/startup-idea-validatorType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add mohitagw15856/pm-claude-skills --skill startup-idea-validator -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install mohitagw15856/pm-claude-skills startup-idea-validator --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/startup-idea-validator .agents/skills/startup-idea-validator && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "startup-idea-validator" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/startup-idea-validator into .agents/skills/startup-idea-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "startup-idea-validator", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mohitagw15856/pm-claude-skills --skill startup-idea-validator -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install mohitagw15856/pm-claude-skills startup-idea-validator --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/startup-idea-validator .cursor/skills/startup-idea-validator && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "startup-idea-validator" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/startup-idea-validator into .cursor/skills/startup-idea-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "startup-idea-validator", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/mohitagw15856/pm-claude-skills.git --path skills/startup-idea-validator--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add mohitagw15856/pm-claude-skills --skill startup-idea-validator -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install mohitagw15856/pm-claude-skills startup-idea-validator --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/startup-idea-validator .gemini/skills/startup-idea-validator && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "startup-idea-validator" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/startup-idea-validator into .gemini/skills/startup-idea-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "startup-idea-validator", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install mohitagw15856/pm-claude-skills startup-idea-validatorInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add mohitagw15856/pm-claude-skills --skill startup-idea-validator -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/startup-idea-validator .github/skills/startup-idea-validator && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "startup-idea-validator" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/startup-idea-validator into .github/skills/startup-idea-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "startup-idea-validator", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mohitagw15856/pm-claude-skills --skill startup-idea-validator -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install mohitagw15856/pm-claude-skills startup-idea-validator --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/startup-idea-validator .opencode/skills/startup-idea-validator && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "startup-idea-validator" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/startup-idea-validator into .opencode/skills/startup-idea-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "startup-idea-validator", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
startup-idea-validator- GitHub stars
- 1.4k
- Token cost
- ~732 tokens
- SKILL.md length
- 349 words
- Files
- 1
- Skills in repo
- 1,348
- Repo updated
- First seen
- Licence
- MIT
At a glance
Pressure-test a startup idea the way a sharp investor or co-founder would — problem, market, wedge, moat, why-now, and the fastest cheap way to test it.
- Works in 6 steps: Steel-man — the strongest case for → Scorecard → The killer risks → …
- Asked to validate a startup idea
- SKILL.md covers Working from a brief, Required Inputs, Output Format and Quality Checks, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Startup Idea Validator is an agent skill from mohitagw15856/pm-claude-skills. Pressure-test a startup idea the way a sharp investor or co-founder would — problem, market, wedge, moat, why-now, and the fastest cheap way to test it. Use when asked to validate a startup idea, evaluate a business idea, stress-test a concept, or decide whether something is worth building. Produces an honest assessment with the strongest case, the killer risks, and the next experiment to run — not cheerleading.
Its SKILL.md is about 730 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Testing & QA, covering Load testing. The repository describes itself as: 1255 professional Agent Skills for Claude, ChatGPT, Gemini, Cursor & Codex — PRDs, postmortems, leases, medical bills, layoffs, go-bags, new countries. Plain markdown, MIT, in… The licence is MIT.
When your agent uses it
- Asked to validate a startup idea
- Evaluate a business idea
- Stress-test a concept
- Decide whether something is worth building
Example prompts
- “/startup-idea-validator”
Workflow steps
6 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 1cbf1f0. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
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.
Context cost
Startup Idea Validator loads about 732 tokens when it runs. Until then it costs about 110 tokens; SKILL.md has 349 words of instructions outside code blocks.
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 passed
The automated check found no risky patterns in SKILL.md.
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 mohitagw15856/pm-claude-skills at commit 1cbf1f0, republished under its MIT licence (© mohitagw15856). 349 words, ~732 tokens.
Download SKILL.mdSave it as
.claude/skills/startup-idea-validator/SKILL.md (or your agent's skills folder).- name
- startup-idea-validator
- description
- Pressure-test a startup idea the way a sharp investor or co-founder would — problem, market, wedge, moat, why-now, and the fastest cheap way to test it. Use when asked to validate a startup idea, evaluate a business idea, stress-test a concept, or decide whether something is worth building. Produces an honest assessment with the strongest case, the killer risks, and the next experiment to run — not cheerleading.
Startup Idea Validator Skill
Most ideas die from one fatal flaw the founder won't see. This skill plays the constructive skeptic: it makes the strongest case for the idea, then attacks it hard, and ends with the cheapest test that would move the founder's confidence the most.
Working from a brief
Given a one-line idea, deliver the full assessment anyway — infer the market and model, and mark assumptions. Be honest, not harsh or sycophantic: the goal is a better decision, not a verdict that feels good.
Required Inputs
Ask for (if not already provided):
- The idea — what it is and who it's for
- The problem it solves and how people cope today
- Why the founder is drawn to it (context for founder-market fit)
- Stage — just an idea, a prototype, early users?
Output Format
1. Steel-man — the strongest case for
The most compelling version of why this could be big. Take it seriously.
2. Scorecard
| Dimension | Read | Notes |
|---|---|---|
| Problem (real & painful?) | 🟢/🟡/🔴 | |
| Market (big & reachable?) | 🟢/🟡/🔴 | |
| Wedge (sharp entry point?) | 🟢/🟡/🔴 | |
| Why-now (what changed?) | 🟢/🟡/🔴 | |
| Moat (defensible over time?) | 🟢/🟡/🔴 | |
| Distribution (can you reach buyers cheaply?) | 🟢/🟡/🔴 |
3. The killer risks
The 2–3 things most likely to kill this. Be specific — name the assumption that, if false, ends it.
4. Closest competitors / why-not-already
Who's near this, and the honest answer to "if this is a good idea, why doesn't it exist / why hasn't [incumbent] done it?"
5. The next experiment
The single cheapest, fastest test that would most change your confidence — what to do this week, and what result would be a green vs red light.
6. Verdict
Promising / Promising-with-conditions / Reconsider — with the one sentence that decides it.
Quality Checks
- Steel-mans the idea before critiquing it
- Names specific killer assumptions, not generic "execution risk"
- Answers "why doesn't this already exist?"
- Ends with a concrete, cheap, this-week experiment
Anti-Patterns
- Cheerleading (validating because the founder wants a yes)
- Generic critique that applies to any startup
- Recommending a 6-month build as the "test"
- A verdict with no path forward
Example Trigger Phrases
- "Validate a startup idea."
- "Evaluate a business idea."
- "Stress-test a concept."
- "Decide whether something is worth building."
© mohitagw15856, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in skills/startup-idea-validator of mohitagw15856/pm-claude-skills.
Open the folder on GitHubat commit 1cbf1f0
Compare with similar skills
Startup Idea Validator 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Startup Idea Validator this skillmohitagw15856/pm-claude-skills | 1.4k | — | ~732 | Automated safety check: Pass | MIT | |
| Thinking Partnermattnowdev/thinking-partner | 206 | — | ~4.4k | Automated safety check: Pass | MIT | |
| High Token ModeLomnus-ai/TokenBurner | 173 | — | ~9.1k | Automated safety check: Pass | MIT | |
| Idea ValidatorBuildGreatProducts/builder-os | 228 | — | ~3.8k | Automated safety check: Pass | MIT | |
| Risk AnalyzerCoWork-OS/CoWork-OS | 474 | — | ~779 | Automated safety check: Pass | MIT | |
| Microbenchmarkingdotnet/skills | 5.6k | 3 repos | ~3.3k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Startup Idea Validator
What does Startup Idea Validator do?
Pressure-test a startup idea the way a sharp investor or co-founder would — problem, market, wedge, moat, why-now, and the fastest cheap way to test it. Startup Idea Validator is an agent skill from mohitagw15856/pm-claude-skills. Pressure-test a startup idea the way a sharp investor or co-founder would — problem, market, wedge, moat, why-now, and the fastest cheap way to test it.
When should I use Startup Idea Validator?
Startup Idea Validator fits situations like: asked to validate a startup idea; evaluate a business idea; stress-test a concept; decide whether something is worth building.
How do I install Startup Idea Validator in Claude Code?
Run `npx skills add mohitagw15856/pm-claude-skills --skill startup-idea-validator -a claude-code`. Or copy the skill folder (skills/startup-idea-validator in mohitagw15856/pm-claude-skills) into .claude/skills/startup-idea-validator in your project. Claude Code loads it when a task matches its description.
How do I install Startup Idea Validator in Codex?
Run `npx skills add mohitagw15856/pm-claude-skills --skill startup-idea-validator -a codex`. Or copy the skill folder (skills/startup-idea-validator in mohitagw15856/pm-claude-skills) into .agents/skills/startup-idea-validator in your project. Codex loads it when a task matches its description.
Can I use Startup Idea Validator 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 mohitagw15856/pm-claude-skills --skill startup-idea-validator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/startup-idea-validator, .gemini/skills/startup-idea-validator, .github/skills/startup-idea-validator and .opencode/skills/startup-idea-validator in your project.
What does Startup Idea Validator need to run?
SKILL.md names no scripts, command-line tools or credentials: Startup Idea Validator is instructions for the agent only.
Does Startup Idea Validator access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Startup Idea Validator safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Startup Idea Validator use?
Startup Idea Validator 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 Startup Idea Validator use?
About 732 tokens (SKILL.md is roughly 2.9k 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 Startup Idea Validator?
Skills that share tags, products or a category with Startup Idea Validator: Thinking Partner (mattnowdev/thinking-partner, 206 stars), High Token Mode (Lomnus-ai/TokenBurner, 173 stars), Idea Validator (BuildGreatProducts/builder-os, 228 stars) and Risk Analyzer (CoWork-OS/CoWork-OS, 474 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Startup Idea Validator?
mohitagw15856 (a GitHub user) maintains it in mohitagw15856/pm-claude-skills, which has 1,433 GitHub stars. The repository holds 1,348 skills in this directory. The repository was last updated on October 8, 2026.
Source: mohitagw15856/pm-claude-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.