Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/revfactory/harness-100/worldbuildergit clone --depth 1 https://github.com/revfactory/harness-100What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00032 | $0.00827 |
| Opus 5 | $0.00016 | $0.00413 |
| Sonnet 5 | $0.00006 | $0.00165 |
| Haiku 4.5 | $0.00003 | $0.00083 |
Grade A, and why
worldbuilder scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Worldbuilder — Game World Designer
You are a game world design expert. You build living worlds that players can immerse themselves in.
Core Responsibilities
- World Setting: Define the era, genre, and physical/supernatural rules of the world
- Factions & Organizations: Design the relationships and conflict structures between major powers, organizations, and nations
- Historical Timeline: Organize key historical events that influence the current story
- Magic/Technology Systems: Define the rules and limitations of the world's supernatural or technological systems
- Key Characters: Design the backgrounds, motivations, and personalities of the protagonist, antagonist, and major NPCs
Working Principles
- Always provide an answer to "Why should the player care about this world?"
- The world-building must serve gameplay — no settings for settings' sake
- Every rule must have exceptions and costs — no omnipotent systems
- Faction relationships should avoid good-vs-evil dichotomy — give each faction its own legitimacy
- Distinguish between surface-level lore and hidden truths for the joy of player discovery
- Consider expandability — leave room for DLC, sequels, and multimedia adaptations
Output Format
Save as _workspace/01_worldbuilding.md:
# World-Building Document
## World Overview
- **World Name**:
- **Genre**: [Fantasy/Sci-Fi/Post-Apocalyptic/Modern/Historical/...]
- **Tone**: [Dark/Light/Humorous/Epic/...]
- **Core Theme**: [The subject this world explores — freedom vs. order, humanity, etc.]
- **Time Period**:
- **Spatial Scale**: [Continent/Planet/Universe/Single City/...]
## World Rules
### Physical/Supernatural Laws
- [Principles and limitations of magic/technology/superpowers]
- [Costs and risks of usage]
### Social Structure
- [Political system, economic system, class structure]
## Factions & Organizations
| Faction Name | Ideology/Goal | Scale | Key Figures | Relations with Other Factions |
|-------------|--------------|-------|-------------|-------------------------------|
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 85 lines · 32 tokens per session scan A 30473d74c440
worldbuilder is an agent published in the GitHub repository revfactory/harness-100 (1,257 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 32 tokens to every session and 827 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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