Let Fate Decide

A Claude Code skill that draws Tarot cards using secrets to inject entropy into vague or underspecified planning decisions.

What It Does

When a prompt is sufficiently ambiguous, or the user explicitly invokes fate, this skill shuffles a 22-card Major Arcana deck and a 56-card Minor Arcana deck independently using cryptographic randomness, then deals the 12 Houses of the Zodiac spread. Each house receives one Major Arcana card followed by two Minor Arcana cards, and all 36 cards may appear reversed. Claude then interprets the spread and uses the reading to inform its approach.

Triggers

• Vague or ambiguous prompts where multiple reasonable approaches exist
• "I'm feeling lucky", "let fate decide", "dealer's choice", "surprise me", "whatever you think", "YOLO"
• Casual delegation ("whatever", "up to you", "your call", "idk", "just do something", "wing it", "I trust you", "doesn't matter", "do what you want", "I don't care", "any approach works", "you pick")
• Yu-Gi-Oh references ("heart of the cards", "I believe in the heart of the cards", "you've activated my trap card", "it's time to duel")
• Shrug-like brevity -- very short prompts that fully delegate the decision
• About to arbitrarily pick between 2+ valid approaches (draw cards instead)
• "Try again" on a system with no actual changes (redraw)

How It Works

The spread is drawn by the draw agent (agents/draw.md), dispatched as let-fate-decide:draw.

1. A Python script uses secrets.randbelow() to perform Fisher-Yates shuffles
2. A Major Arcana deck and Minor Arcana deck are shuffled separately
3. 12 houses are dealt, each with 1 Major Arcana and 2 Minor Arcana cards
4. Each card has an independent 50% chance of being reversed
5. Claude reads the house reference files and drawn cards' meaning files
6. Claude interprets the spread
7. The interpretation informs the planning direction

The default spread records a conservative unordered-card entropy budget exceeding 100 bits: roughly log2(C(22,12)) bits from Major Arcana selection, log2(C(56,24)) bits from Minor Arcana selection (assuming secrets.randbelow() is cryptographically secure), and 36 bits from independent card reversal choices. Exact values are computed at draw time and reported in the JSON output under entropy_bits. The actual ordered assignment of cards to houses contains more entropy.

In security, audit, and correctness workflows, this skill is only a discovery and hypothesis-generation aid. It can suggest where to look next, but evidence from review, testing, reproduction, or formal reasoning must decide whether a risk is real or resolved.

Reference Organization

Each zodiac house has its own markdown file under houses/. These files explain the house's technical meaning for building new projects, vulnerability discovery, correctness verification, and recurring workflows from the local security and engineering workflows this skill supports.

references/TECHNICAL_CONTEXT_LENSES.md distills those workflow themes into audit-stage, evidence-mode, domain, failure-class, and human/organizational lenses.

Each of the 78 Tarot cards has its own markdown file:

• cards/major/ - 22 Major Arcana (The Fool through The World)
• cards/wands/ - 14 Wands (Ace through King)
• cards/cups/ - 14 Cups (Ace through King)
• cards/swords/ - 14 Swords (Ace through King)
• cards/pentacles/ - 14 Pentacles (Ace through King)