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worldbuilding · jwynia — Claude Code skill: what it does, how to install

Diagnoses fictional setting flaws when institutions, economies, or species feel artificial. Pinpoints missing logic in speculative fiction.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓
npx skills add jwynia/agent-skills --skill worldbuilding -a claude-code
Open on GitHub

What worldbuilding does

This skill evaluates fictional settings against the core principle that believable worlds evolve rather than appear fully formed. It checks stories for specific failure states, focusing on consequence-free magic and non-human species acting like humans in costume. The diagnostic traces a three-order consequence cascade to map how speculative elements alter practical reality, power structures, and cultural norms.

The instructions focus entirely on auditing narrative setups. They offer targeted questions about economic scarcity, organizational crises, and religious schisms. If you need to generate a universe from scratch or fix character arcs, this tool will not do that. It is an evaluation framework, not a creative generator.

What it helps with

  • identify weak trade logistics and missing resource scarcity in story settings
  • trace secondary and tertiary social effects of speculative technologies
  • deepen flat non-human species beyond cosmetic physical traits
  • uncover artificial institutions that lack historical crises and contradictions

Example prompts for the agent

  • Run a worldbuilding diagnosis on the trade economy of the desert faction
  • Apply the consequence cascade to our story's memory-erasing tech
  • Evaluate whether this alien species feels like humans in costume

How to install worldbuilding

1Skills CLI (Vercel)

npx skills add jwynia/agent-skills --skill worldbuilding -a claude-code

2Manually: put the files in place

~/.claude/skills/worldbuilding/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/worldbuilding/

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about worldbuilding

How to install worldbuilding in Claude Code?

Run npx skills add jwynia/agent-skills --skill worldbuilding -a claude-code. You can also save the file directly to ~/.claude/skills/worldbuilding/SKILL.md.

What does the worldbuilding skill do?

It diagnoses world-level design flaws across fiction genres. The skill identifies backdrop settings, surface-level cultures, and technologies that fail to transform society.

Can worldbuilding generate a fictional universe from scratch?

No, it operates strictly as a diagnostic tool for existing material. For generating a world from an initial divergence point, the author directs users to systemic-worldbuilding.

Source text

SKILL.md · MIT
---
name: worldbuilding
description: "Diagnose world-level story problems. This skill should be used when settings feel thin, institutions feel designed rather than evolved, economies don't make sense, or non-human species feel like humans in costume. Keywords: worldbuilding, setting, world, institutions, economy, culture, species, consequences."
license: MIT
compatibility: Works with any fiction genre. Pairs with story-sense for routing.
metadata:
  author: jwynia
  version: "1.0"
  type: diagnostic
  mode: diagnostic
  domain: worldbuilding
---

# Worldbuilding: Diagnostic Skill

Diagnose world-level problems in fictional settings. Identify what's missing or unconvincing and recommend specific interventions.

## When to Use This Skill

Use this skill when:
- Setting feels like a painted backdrop
- Technology/magic hasn't transformed society
- Institutions feel designed rather than evolved
- Economy doesn't make sense
- Cultures lack depth

Do NOT use this skill when:
- Story problems are character-focused (use character-arc)
- Plot structure issues (use scene-sequencing)
- Need to generate worlds from scratch (use systemic-worldbuilding)

## Core Principle

**Worlds fail when they feel designed rather than evolved.**

Good worldbuilding creates the perception that the setting has history, internal logic, and processes that operate independently of the plot.

## The World States

### W1: Backdrop World
**Symptoms:** Setting exists but has no independent logic
**Interventions:** systemic-worldbuilding (trace consequences)

### W2: World Without Consequences
**Symptoms:** Technology/magic exists but hasn't transformed society
**Interventions:** Consequence Cascade Analysis

### W3: Institutions Without History
**Symptoms:** Organizations feel designed last week
**Interventions:** Organic Institutional Design

### W4: Economy Doesn't Make Sense
**Symptoms:** Trade exists without supply chains; prices arbitrary
**Interventions:** economic-systems

### W5: Belief Systems Are Shallow
**Symptoms:** Religion is flavor without theological depth
**Interventions:** belief-systems

### W6: Culture Without Depth
**Symptoms:** Traditions feel random; surface-level aesthetic
**Interventions:** memetic-depth

### W7: Flat Non-Humans
**Symptoms:** Aliens/species are humans in costume
**Interventions:** conlang, alien-sensory frameworks

### W7.5: Language Feels Generic
**Symptoms:** Names sound like English; no linguistic texture
**Interventions:** conlang, language-evolution

## Consequence Cascade

Apply to any major speculative element:

```
Initial Element
├── 1st Order: Direct practical effects
│   ├── Who gains immediate advantage?
│   ├── What becomes obsolete?
│   └── Technical limitations?
├── 2nd Order: Systemic adaptations
│   ├── How do economic structures adapt?
│   ├── How do power structures respond?
│   └── What resistance movements arise?
└── 3rd Order: Cultural evolution
    ├── What new language emerges?
    ├── What ethical questions arise?
    └── What becomes normalized?
```

## Key Diagnostic Questions

### For Technology/Magic
- What's your initial divergence from our world?
- Who gains power? What becomes obsolete?
- How would the powerful try to control this?

### For Institutions
- When was this organization founded?
- What crises has it survived?
- What are its internal contradictions?

### For Economics
- What's the fundamental scarcity?
- How is value determined?
- What's the underground economy?

### For Belief Systems
- What explains existence?
- How do beliefs affect daily decisions?
- What are the schisms and debates?

## Common Anti-Patterns

### The Monoculture
One unified culture for entire planets/species.
**Fix:** Add regional variation, class differences, schisms.

### The Convenient Technology
Technology exists when plot needs it.
**Fix:** Trace consequence cascade.

### The Static History
World unchanged for centuries.
**Fix:** Add recent disruptions, reforms in progress.

### The Evil Empire
Antagonist nation uniformly evil.
**Fix:** Add internal debates, ordinary people.

### The Rubber Forehead Alien
Non-humans with minor cosmetic differences.
**Fix:** Start with biology, trace to cognition, trace to culture.

## Depth vs Breadth

**Go Deep When:**
- Element is central to plot
- Element will be examined closely
- Element creates ongoing conflict

**Stay Shallow When:**
- Element is background detail
- POV character wouldn't know depth
- Mystery is more interesting

## Related Skills

- **systemic-worldbuilding** - Build worlds from initial divergence
- **belief-systems** - Deep theological design
- **economic-systems** - Economic logic
- **governance-systems** - Political structures
- **conlang** - Language design
- **settlement-design** - Cities and geography

© jwynia · MIT · jwynia/agent-skills

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