What is ontoguard-extension?

OntoGuard is a small VS Code and Cursor extension that checks written business rules for contradictions or gaps before an AI agent or a person acts on them. It runs entirely on your own machine, with no account, cloud service, or API key needed. The problem it solves is simple to describe but easy to miss by hand. Two rules might both look reasonable on their own, such as one saying a claim must be paid once coverage is confirmed, and another saying the same claim must not be paid while there is an open investigation. A person reading both might catch the conflict, but an automated system often will not, and could end up paying a claim it should have blocked. Similarly, a rule might say a duty continues until some condition is met, but if nothing in the rule set actually checks for that condition, the duty never really ends. You give OntoGuard your rules in one of two formats: a simple JSON file listing each rule's subject, required action, trigger condition, and optional end condition, or a Turtle file using SHACL, a standard way of describing data constraints. Running a command checks the rules and reports contradictions, unmatched end conditions, or SHACL violations in VS Code's Problems and Output panels, in plain language rather than technical jargon. The author is clear about its limits: this is a structural checker, not a full mathematical proof system, so it catches common and costly mistakes early rather than guaranteeing complete correctness. It also does not replace legal review, and it does not send any of your files off your machine. The project ships with sample rule files and a one-click demo scenario so a new user can see the tool work before writing their own rules.