agent-brain: Skill for Claude Code

Read your current thinking on a topic and argue against it. Anti-sycophancy engine.

Usage: /challenge {topic or belief}

Examples:

• /challenge YC is the right path for my startup
• /challenge I should focus on Rust
• /challenge v0 templates are worth my time
• /challenge I need to learn math for ML
• /challenge this is the best long-term career move

WAVE 0: Understand the Belief (PARALLEL)

#	Tool	Call	Purpose
1	Grep	Search $ARGUMENTS keywords across 03_Garden/concepts/, 02_Journal/daily/, 04_Projects/	Direct mentions in vault
2	Grep	Search $ARGUMENTS keywords in 05_Areas/	Area-specific context
3	Read	CLAUDE.md	Goals and priorities context
4	Grep	Search $ARGUMENTS keywords in 02_Journal/weekly/	Weekly goal history

WAVE 1: Map the Belief

Synthesize what you currently believe about this topic:

YOUR POSITION (as I understand it)
Topic: "{topic}"

Current stance:
{What you've written/done that supports this belief}

Evidence from your vault:
1. [{date}] {daily/note}: "{relevant quote or action}"
2. [{date}] {daily/note}: "{relevant quote or action}"
3. [{date}] {daily/note}: "{relevant quote or action}"

Strength of conviction: {HIGH/MEDIUM/LOW}
(based on: frequency of mentions, actions taken, resources invested)

Present this first. "Is this an accurate read of your position?"

If you correct it, I'll adjust before proceeding.

WAVE 2: Build the Counter-Case

Construct the strongest possible argument AGAINST the belief. Use these lenses:

Lens 1: Opportunity Cost

What are you NOT doing because of this belief?

OPPORTUNITY COST
By pursuing {belief}, you're implicitly deprioritizing:
- {thing 1} (evidence: {n} days since last engagement)
- {thing 2} (was in goals but dropped)
Time invested: ~{hours/weeks} based on commit/note frequency
What if that time went to {alternative}?

Lens 2: Survivorship Bias

Are you cherry-picking evidence?

SURVIVORSHIP BIAS
You remember: {the wins, the positive signals}
You might be ignoring:
- {failed attempt from vault}
- {abandoned related project}
- {negative signal you noted but didn't act on}