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Agent skill

Idea Validation

by c0x12c in c0x12c/ai-toolkit

Validate a startup idea with competitor analysis, market signals, and risk assessment.

No licenceAuto-check passedMarketing & SEO

Install Idea Validation

skills CLI
$ npx skills add c0x12c/ai-toolkit --skill idea-validation -a claude-code

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

GitHub CLI
$ gh skill install c0x12c/ai-toolkit idea-validation --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/c0x12c/ai-toolkit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.codex/skills/idea-validation .claude/skills/idea-validation && 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
idea-validation
GitHub stars
106
Token cost
~1k tokens
SKILL.md length
591 words
Files
2
Skills in repo
33
Repo updated
First seen
Licence
None found

At a glance

Validate a startup idea with competitor analysis, market signals, and risk assessment.

  • Works in 7 steps: Understand the Idea → Problem Check → Market Check → …
  • The user wants to test if an idea is worth building
  • SKILL.md covers When to Use, Process, Interaction Style and Rules, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Idea Validation is an agent skill from c0x12c/ai-toolkit. Validate a startup idea with competitor analysis, market signals, and risk assessment. Be brutally honest. Use when the user wants to test if an idea is worth building.

Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `example-report.md`).

It sits in Marketing & SEO, covering Competitor analysis.

When your agent uses it

  • The user wants to test if an idea is worth building
  • Tasks that involve Competitor analysis

Example prompts

  • “/idea-validation”

Workflow steps

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

  1. Understand the Idea
  2. Problem Check
  3. Market Check
  4. Competitor Check
  5. Distribution Check
  6. Build Check
  7. Verdict

What it can do on your machine

Read from SKILL.md and the folder at commit 96b2c9d. 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

Idea Validation loads about 1k tokens when it runs. Until then it costs about 46 tokens; SKILL.md has 591 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~46
When it runs · the whole SKILL.md, loaded when a task matches
~1k

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 591 words (~1,008 tokens).

“Kill bad ideas fast. Save time for good ones.”

— opening of SKILL.md by c0x12c
name
idea-validation

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file in .codex/skills/idea-validation of c0x12c/ai-toolkit.

  • SKILL.md
  • example-report.md

Open the folder on GitHubat commit 96b2c9d

Compare with similar skills

Idea Validation 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.

Idea Validation compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Idea Validation this skillc0x12c/ai-toolkit106—~1kAutomated safety check: PassNone
SEO Content Brief GeneratorAgriciDaniel/claude-seo19k2 repos~2.6kAutomated safety check: PassMIT
SEO DataforseoAgriciDaniel/codex-seo7972 repos~4.6kAutomated safety check: PassMIT
Competitor ProfilingNexus-JPF/note-companion8704 repos~3.5kAutomated safety check: PassMIT
Startup Competitorsferdinandobons/startup-skill1.2k—~4.1kAutomated safety check: PassMIT
Amazon Listing Competitor Analysisbrowser-act/skills6.1k1 repos~3.2kAutomated safety check: PassMIT

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Categories

Questions about Idea Validation

What does Idea Validation do?

Validate a startup idea with competitor analysis, market signals, and risk assessment. Idea Validation is an agent skill from c0x12c/ai-toolkit. Validate a startup idea with competitor analysis, market signals, and risk assessment.

When should I use Idea Validation?

Idea Validation fits situations like: the user wants to test if an idea is worth building; tasks that involve Competitor analysis.

How do I install Idea Validation in Claude Code?

Run `npx skills add c0x12c/ai-toolkit --skill idea-validation -a claude-code`. Or copy the skill folder (.codex/skills/idea-validation in c0x12c/ai-toolkit) into .claude/skills/idea-validation in your project. Claude Code loads it when a task matches its description.

How do I install Idea Validation in Codex?

Run `npx skills add c0x12c/ai-toolkit --skill idea-validation -a codex`. Or copy the skill folder (.codex/skills/idea-validation in c0x12c/ai-toolkit) into .agents/skills/idea-validation in your project. Codex loads it when a task matches its description.

Can I use Idea Validation 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 c0x12c/ai-toolkit --skill idea-validation -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/idea-validation, .gemini/skills/idea-validation, .github/skills/idea-validation and .opencode/skills/idea-validation in your project.

What does Idea Validation need to run?

SKILL.md names no scripts, command-line tools or credentials: Idea Validation is instructions for the agent only.

Does Idea Validation 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 Idea Validation 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 Idea Validation use?

No licence was found for Idea Validation or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Idea Validation use?

About 1k tokens (SKILL.md is roughly 4k 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 Idea Validation?

Skills that share tags, products or a category with Idea Validation: SEO Content Brief Generator (AgriciDaniel/claude-seo, 19k stars), SEO Dataforseo (AgriciDaniel/codex-seo, 797 stars), Competitor Profiling (Nexus-JPF/note-companion, 870 stars) and Startup Competitors (ferdinandobons/startup-skill, 1.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Idea Validation?

c0x12c (a GitHub organization) maintains it in c0x12c/ai-toolkit, which has 106 GitHub stars. The repository holds 33 skills in this directory. The repository was last updated on June 18, 2026.

Source: c0x12c/ai-toolkit on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.