Acts as a devil's advocate to challenge assumptions and plans. Provides red-teaming and pre-mortem analysis for projects.

Install

mkdir -p .claude/skills/the-fool && curl -L -o skill.zip "https://agentskills.codes/api/skills/download/5011" && unzip -o skill.zip -d .claude/skills/the-fool && rm skill.zip

Installs to .claude/skills/the-fool

Activation

This is the description your AI agent reads to decide when to run this skill — the better it matches your request, the more reliably it fires.

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.
191 chars✓ has a “when” trigger
Advanced

Key capabilities

  • Expose unstated assumptions using Socratic questioning
  • Build counter-arguments via Hegelian dialectic
  • Identify failure modes through pre-mortem analysis
  • Perform red team adversarial profiling
  • Audit evidence using falsification criteria

How it works

It applies structured critical reasoning modes to stress-test user proposals, requiring the user to engage with challenges before synthesizing a strengthened position.

Inputs & outputs

You give it
Idea, plan, or decision proposal
You get back
Critical reasoning report with synthesis

When to use the-fool

  • Red-teaming a new architecture design
  • Running a project pre-mortem
  • Challenging core assumptions in a business plan
  • Auditing evidence for a technical decision

About this skill

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

  1. Identify — Extract the user's position from conversation context. Restate it as a steelmanned thesis for confirmation.
  2. Select — Use AskUserQuestion with two-step mode selection (see below).
  3. Challenge — Apply the selected mode's method. Load the corresponding reference file for deep guidance.
  4. Engage — Present the 3-5 strongest challenges. Ask the user to respond before proceeding.
  5. Synthesize — Integrate insights into a strengthened position. Offer a second pass with a different mode.

Mode Selection

Use AskUserQuestion to let the user choose how to challenge their idea.

Step 1 — Pick a category (4 options):

OptionDescription
Question assumptionsProbe what's being taken for granted
Build counter-argumentsArgue the strongest opposing position
Find weaknessesAnticipate how this fails or gets exploited
You chooseAuto-recommend based on context

Step 2 — Refine mode (only when the category maps to 2 modes):

  • "Question assumptions" → Ask: "Expose my assumptions" (Socratic) vs "Test the evidence" (Falsification)
  • "Find weaknesses" → Ask: "Find failure modes" (Pre-mortem) vs "Attack this" (Red team)
  • "Build counter-arguments" → Skip step 2, proceed with Dialectic synthesis
  • "You choose" → Skip step 2, load references/mode-selection-guide.md and auto-recommend

5 Reasoning Modes

ModeMethodOutput
Expose My AssumptionsSocratic questioningProbing questions grouped by theme
Argue the Other SideHegelian dialectic + steel manningCounter-argument and synthesis proposal
Find the Failure ModesPre-mortem + second-order thinkingRanked failure narratives with mitigations
Attack ThisRed teamingAdversary profile, attack vectors, defenses
Test the EvidenceFalsificationism + evidence weightingClaims audited with falsification criteria

Reference Guide

TopicReferenceLoad When
Socratic questioningreferences/socratic-questioning.md"Expose my assumptions" selected
Dialectic and synthesisreferences/dialectic-synthesis.md"Argue the other side" selected
Pre-mortem analysisreferences/pre-mortem-analysis.md"Find the failure modes" selected
Red team adversarialreferences/red-team-adversarial.md"Attack this" selected
Evidence auditreferences/evidence-audit.md"Test the evidence" selected
Mode selection guidereferences/mode-selection-guide.md"You choose" selected or auto-recommend needed

Constraints

MUST DO

  • Steelman the thesis before challenging it (restate in strongest form)
  • Use AskUserQuestion for mode selection — never assume which mode
  • Ground challenges in specific, concrete reasoning (not vague "what ifs")
  • Maintain intellectual honesty — concede points that hold up
  • Drive toward synthesis or actionable output (never leave just objections)
  • Limit challenges to 3-5 strongest points (depth over breadth)
  • Ask user to engage with challenges before synthesizing

MUST NOT DO

  • Strawman the user's position
  • Generate challenges for the sake of disagreement
  • Be nihilistic or purely destructive
  • Stack minor objections to create false impression of weakness
  • Skip synthesis (never leave the user with just a pile of problems)
  • Override domain expertise with generic skepticism
  • Output mode selection as plain text when AskUserQuestion can provide structured options

Output Templates

Each mode produces a structured deliverable. See the corresponding reference file for the full template.

ModeDeliverable
Expose My AssumptionsAssumption inventory + probing questions by theme + suggested experiments
Argue the Other SideSteelmanned thesis + antithesis argued + synthesis proposed + confidence rating
Find the Failure ModesRanked failure narratives + early warning signs + mitigations + inversion check
Attack ThisAdversary profiles + ranked attack vectors + perverse incentives + defenses
Test the EvidenceClaims extracted + falsification criteria + evidence grades + competing explanations

After any mode, the final output must include:

  1. Steelmanned thesis — The user's position restated in its strongest form
  2. Challenges — 3-5 strongest points from the selected mode
  3. User response — Space for the user to engage before synthesis
  4. Synthesis — Strengthened position integrating the challenges
  5. Next steps — Offer a second pass with a different mode if warranted

Knowledge Reference

Socratic method, Hegelian dialectic, steel manning, pre-mortem analysis, red teaming, falsificationism, abductive reasoning, second-order thinking, cognitive biases, inversion technique

Documentation

When not to use it

  • When the user requires purely supportive feedback
  • When the proposal is already fully validated and implemented

Limitations

  • Limited to 3-5 strongest challenges per pass
  • Requires user engagement to proceed to synthesis

How it compares

It forces a formal, structured challenge process that prevents strawmanning and ensures the user's position is steelmanned before critique.

Compared to similar skills

the-fool side by side with the closest alternatives in the catalog.

SkillInstallsUpdatedSafetyDifficulty
the-fool (this skill)13moNo flagsAdvanced
openspec-explore46moReviewBeginner
thought-patterns68moNo flagsAdvanced
gathering-requirements38moNo flagsIntermediate

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