Hypothesis Validator

A no-fluff AI agent skill for validating startup hypotheses with evidence, ICP clarity, money signals, and GTM reality checks.

Note: You can also use this skill directly in ChatGPT Pro / Extended Pro, or with ChatGPT Deep Research in the browser. Open references/, use the source prompt from references/hypothesis-validator-v2.md directly, then add your hypothesis and context underneath it.

How To Use

After installing, ask your agent to use hypothesis-validator and give it:

• the hypothesis you want to validate
• any constraints or context that matter

Example:

Use hypothesis-validator.

Hypothesis:
AI tool for indie makers that validates startup ideas from Reddit, G2, YouTube comments, and competitor pages.

Context and constraints:
Solo founder, no budget, wants a productized service or small SaaS wedge, prefers B2B, needs first revenue fast.

The skill is intentionally strict: it should help decide whether to kill, reshape, or pursue the hypothesis, not produce a generic market overview.

Install

npx skills add evgeniy038/hypothesis-validator

Install without prompts:

npx skills add evgeniy038/hypothesis-validator -y

Install globally instead of only in the current project:

npx skills add evgeniy038/hypothesis-validator -g

You can combine -g with any agent-specific command below.

Install For Specific Agents

Codex:

npx skills add evgeniy038/hypothesis-validator -a codex

Claude Code:

npx skills add evgeniy038/hypothesis-validator -a claude-code

Antigravity:

npx skills add evgeniy038/hypothesis-validator -a antigravity

Gemini CLI:

npx skills add evgeniy038/hypothesis-validator -a gemini-cli

Cursor:

npx skills add evgeniy038/hypothesis-validator -a cursor

Windsurf:

npx skills add evgeniy038/hypothesis-validator -a windsurf

GitHub Copilot:

npx skills add evgeniy038/hypothesis-validator -a github-copilot

OpenCode:

npx skills add evgeniy038/hypothesis-validator -a opencode

All detected/supported agents:

npx skills add evgeniy038/hypothesis-validator -a '*'

What Gets Installed

SKILL.md
references/hypothesis-validator-v2.md

SKILL.md is the agent entrypoint. The full source prompt lives in references/hypothesis-validator-v2.md and is loaded by the agent when the skill runs.

Manual Install

If your agent does not support npx skills, copy this repository's SKILL.md and references/ folder into that agent's skills directory.

Common locations:

Codex global:        ~/.codex/skills/hypothesis-validator/
Claude Code global:  ~/.claude/skills/hypothesis-validator/
Antigravity global:  ~/.gemini/antigravity/skills/hypothesis-validator/
Gemini CLI global:   ~/.gemini/skills/hypothesis-validator/
Generic project:     .agents/skills/hypothesis-validator/