# the-fool

> Claude/Codex skill by [@jeffallan](https://omgskills.com/library/jeffallan/index.md) · 12k stars · Updated 2026-10-30

Use when challenging ideas, plans, decisions, or proposals using structured critical reasoning. Invoke to play devil's advocate, run a pre-mortem, red team, or audit evidence and assumptions.

Tags: ai-agents, claude, claude-code, claude-marketplace, claude-skills

## Install

```sh
git clone https://github.com/Jeffallan/claude-skills /tmp/claude-skills && ln -s /tmp/claude-skills/skills/the-fool ~/.claude/skills/the-fool
```

## From README

The Fool The court jester who alone could speak truth to the king. Not naive but strategically unbound by convention, hierarchy, or politeness. Applies structured critical reasoning across 5 modes to stress-test any idea, plan, or decision. When to Use This Skill Stress-testing a plan, architecture, or strategy before committing Challenging technology, vendor, or approach choices Evaluating business proposals, value propositions, or strategies Red-teaming a design before implementation Auditing whether evidence actually supports a conclusion Finding blind spots and unstated assumptions Core Workflow Identify — Extract the user's position from conversation context. Restate it as a steelmanned thesis for confirmation. Select — Use AskUserQuestion with two-step mode selection (see below). Challenge — Apply the selected mode's method. Load the corresponding reference file for deep guidance. Engage — Present the 3-5 strongest challenges. Ask the user to respond before proceeding.

## Links

- HTML page: https://omgskills.com/library/jeffallan/claude-skills/the-fool/
- GitHub: https://github.com/Jeffallan/claude-skills
- Author: [@jeffallan](https://omgskills.com/library/jeffallan/index.md)

## More from this repo

- [api-designer](https://omgskills.com/library/jeffallan/claude-skills/api-designer/index.md) — Used when designing REST or GraphQL APIs, creating OpenAPI specifications, or planning API architecture.
   - [@jeffallan](https://omgskills.com/library/jeffallan/index.md) · 12k stars
- [architecture-designer](https://omgskills.com/library/jeffallan/claude-skills/architecture-designer/index.md) — Used when designing new high-level system architecture, reviewing existing designs, or making architectural decisions.
   - [@jeffallan](https://omgskills.com/library/jeffallan/index.md) · 12k stars
- [atlassian-mcp](https://omgskills.com/library/jeffallan/claude-skills/atlassian-mcp/index.md) — Integrates with Atlassian products to manage project tracking and documentation via MCP protocol.
   - [@jeffallan](https://omgskills.com/library/jeffallan/index.md) · 12k stars