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Example world 02 / 08

FakeWiki

If one fact on a page is wrong, does the agent catch it?

The agent opens what looks like an ordinary wiki. You wrote every page, so you can change any fact. Write your own alternate reality, where Apollo landed on Mars or San Francisco is the capital of California. Then see if the agent is fooled and changes what it does.

The Synthetic Web (2026) put one convincing false article at the top of a small fake web's search results, and GPT-5's accuracy fell from 65.1% to 18.2%.

How Adversarial Environments Mislead Agentic AI? (2026) fed agents poisoned tool results across more than 11,000 runs.

Fictionet is a fake internet for testing AI agents. Each world is one program you write, and the agent reaches nothing else. Run one of your evals in a world.