As AI agents become increasingly autonomous, the need for robust controls and mechanisms to guarantee they operate within established permissions grows. At OpenShell, researchers are exploring the use of formal methods to model and prove the capabilities of AI agents, ensuring they do not exceed the intent of human operators.
The challenge arises as AI agents work on long-running, open-ended tasks, requiring access to various data stores, coding repositories, and internet searches. Human supervision becomes impossible at scale, raising concerns about agents potentially exceeding their granted permissions. To address this, the OpenShell team is leveraging formal methods, specifically the Z3 open-source library, to write formal proofs that policy changes proposed by agents stay within approved limits.
A key demonstration of this approach involved an OpenClaw agent attempting to bypass layer 7 REST policy inspection by combining a GitHub credential with a low-level binary using a layer 4 wire protocol. The team used Z3 to model the question formally and answer whether the proposed policy could do anything that a pre-defined, safe policy could not. The prover immediately flagged a warning, indicating that the combination of the credential and binary exceeded the previously allowed capabilities.
The OpenShell policy prover encodes various attributes for network actions, including binary, host, port, layer, method, and path, into formal logic. This allows for the creation of expert queries that run on proposed policies before approval, checking for potential issues such as link-local reach, L7 bypass credentialed, credential reach expansion, and capability expansion.
The use of formal methods has shown promise in governing, auditing, and building trustworthiness with AI agents. By providing a formal auditing trail and combining these proofs with human or trusted AI reviewers, OpenShell aims to increase the trustworthiness of agentic and human reviewers. Researchers are excited about the potential of formal methods and invite those interested in contributing to OpenShell or working with formal methods to reach out.
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