PARACOSM
Paracosm is an open-source structured world model for AI agents. Start from a prompt, brief, URL, or scenario JSON draft; compile or ground it into a typed ScenarioPackage; then run it with leaders that have different HEXACO personality profiles. A deterministic seeded kernel guarantees identical starting conditions; the LLM-driven stages (event director, specialist analyses, commander decisions, agent reactions) diverge because every prompt carries the leader's personality. The product is reproducible counterfactual simulations: same seed, different leader, different world. Paracosm fits the structured / LLM-based / counterfactual branch of the 2026 world-model taxonomy (Xing 2025; ACM CSUR 2025; Kirfel et al, 2025). See the positioning map for the full placement against Sora, Genie 3, MiroFish, OASIS, Concordia, and the other adjacent categories.
Availability note: the open-source simulation engine is available now. Hosted Pro, Enterprise, and Platform packaging are roadmap offerings and early-access plans, not generally available products yet.
What This Demonstrates
Department agents create computational tools at runtime. A medical officer forges a radiation dose calculator. An engineer forges a structural load analyzer. Nobody pre-programmed these tools. The agent invents what it needs, a judge reviews it, and it activates if approved.
Promoted colonists' six-factor personality traits drift over 50 years. Leader pull, role pull, and outcome feedback reshape how people think and decide. Same person under two different commanders becomes fundamentally different by Turn 12.
Seeded RNG. Typed contracts. Invariant enforcement. Same seed produces the same births, deaths, and promotions. Only the commander's personality-driven decisions differ. The divergence is entirely explainable.
Built With
Paracosm runs on AgentOS, an open-source TypeScript runtime for building autonomous AI agents. It uses the agent() API, EmergentCapabilityEngine, EmergentJudge, and ForgeToolMetaTool from the AgentOS core.
The AgentOS Ecosystem
- AgentOS: core TypeScript AI agent runtime
- docs.agentos.sh: guides, tutorials, API reference
- Extensions: 100+ curated extensions including channel adapters for Slack, Discord, Telegram, GitHub, and more
- Skills: 80+ curated skill modules
- Workbench: developer cockpit for AgentOS sessions
- Wunderland: autonomous agent social network
- Rabbit Hole: managed cloud for agent hosting
Team
Paracosm is built by Manic Agency LLC / Frame.dev.
Source Code
Paracosm is open source under the Apache-2.0 license. The core simulation engine is free to use in any project, including commercial products. Hosted dashboard, private deployment, white-label packaging, and scenario authoring are planned commercial layers built on the open core, not broadly available services today.