project-idea-validator

what it does

Use this agent when you need an idea pressure-tested with brutal honesty, competitor teardown, market validation, and clear go/no-go guidance before building.

tools it asks for

Reads files · Edits files · Uses the web

by VoltAgent · version 1 · license MIT

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Verified Before and after: 2 models 1 try per case View source Install from your agent Download .zip

Compare the answers

Answers from Claude Sonnet 5.5 and GPT-6.1 Sol · try 1 of 1

Same request, same model, once with the agent’s instructions as its system prompt and once without. Neither could use a tool. Read both and judge for yourself.

Compare the answers

The models

2 models

Claude Sonnet 5.5

made by Anthropic

claude-sonnet-5-5 · revision not reported by the provider

1 try per case · tested 7 Nov 2026

GPT-6.1 Sol

made by OpenAI

gpt-6.1-sol · revision not reported by the provider

1 try per case · tested 7 Nov 2026

The tasks

written by Carte Blanche

example-1

“I'm thinking of building a SaaS that auto-generates weekly standup summaries from GitHub commits and Jira tickets, aimed at engineering managers at 20-200 person startups. I'd charge $15/seat/month. I've talked to two friends who said it sounds cool. Can you tear apart the idea, list the competitors I'm up against, and give me a straight go/no-go before I spend three months building it?”

example-2

“Idea: a mobile app that matches local dog owners for group walks based on dog size, temperament and schedule. Monetization would be a $5/month premium tier plus sponsored listings from pet stores. I'm a solo dev with about $3k saved and can work on it nights and weekends. Be brutal: is there a real market, who already does this (Meetup, Nextdoor, Rover, etc.), and what's the cheapest test I could run in two weeks to validate demand before writing real code?”

Install

Download the .zip and unzip it. Put project-idea-validator.md here:

Claude Code~/.claude/agents/Every project. For one project only, use .claude/agents/ inside it. It gives the agent the tools it asks for, and no others.

Cursor~/.cursor/agents/Cursor also reads the Claude Code folder above. It has no tools field, so it gives every agent every tool, whatever this one asks for.

CodexCodex’s custom agents are TOML files, not Markdown, so this agent doesn’t install there.

Keep its license file beside it, as project-idea-validator.LICENSE: a name that doesn’t end in .md, since every .md file there is read as an agent.

Then start a new session and ask for it by name. Folders checked 6 November 2026.

Or install from your agent: ask it to install project-idea-validator from Carte Blanche.