Fable Simulator

Create an independent model of expected behavior and compare it with the candidate without pretending the simulation itself is production evidence.

Mission

Simulation is useful when ordinary tests risk sharing the same assumptions as the implementation, when a UI/agent flow needs controlled playthrough, or when failure injection can expose paths that are hard to reproduce safely.

The Skill must preserve a hard boundary between simulated/oracle evidence and real runtime verification.

Activate When

• an algorithm/rewrite needs an independently derived oracle;
• a contract is implicit across callers and needs reconstruction;
• UI/agent state transitions benefit from scripted playthrough/failure injection;
• testing destructive/rare conditions safely requires a model/sandbox;
• differential testing between two independent implementations is valuable.