Architectural considerations from building our programming language, Witness: Witness was originally architected to be a programming language for agents to communicate with each other without leaking information or being susceptible to prompt injection. It was designed for social contracts, where parties use agents to reveal private information to other agents without leaking it back to the human layer—preventing any form of front-running or malicious context extraction. This was part of our broader work to imagine newer protocols which increase the fluidity of information without detriment to social concerns of privacy. It has since evolved into a foundation for more sophisticated strategies and systems of information revelation, including a functional decision framework for asymmetric coordination in markets with humans and agents. Witness unlocks a new paradigm with fractional information sharing, which informs new foundations and a more complete aperture to contemporary market structures. This prompts possible solutions to questions like "what does it mean to have a financial market with hidden prices?"