Description
Antaeus is an open-source project focused on building semantic policy infrastructure. It transforms human-written policies into versioned artifacts, named tests, explicit outcomes, and evidence that applications can inspect. This approach allows for the creation of semantic policy decisions that are inspectable and testable. Antaeus is designed to handle meaning-heavy decisions that require interpretation of language, intent, context, or exceptions, while deterministic requirements remain in deterministic code.
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The platform offers a semantic decision engine that separates policy evaluation from system authority and accountability. It allows users to author and validate policies locally using constrained YAML or JSON against a versioned schema. Users can test named cases, choose evaluator routes, and evaluate policies explicitly, returning outcomes such as allow, review, deny, or failure.
Antaeus is available as an open-source core, with a hosted beta offering API keys, managed policies, and prepaid usage. The project is maintainer-led, with a focus on narrow boundaries, explicit evidence, and honest maturity. It supports good-faith security research and emphasizes data minimization and tenant boundaries.
The platform is suitable for industries and roles that require semantic policy enforcement, such as marketplace moderation, user-generated content review, support and AI replies, and vendor onboarding. It is particularly useful for applications where policy meaning must be interpreted and decisions need to be attributable and testable.
- CategoryCompliance & Risk Management
- Pricing ModelFreemium
- DeploymentLocal, Cloud
- PlatformsWeb
Antaeus's Core Features
Open-source semantic policy infrastructure
Versioned policy artifacts
Named tests and explicit outcomes
Traceable evidence for policy decisions
Local policy authoring and validation
Experimental OpenAI evaluator
Hosted beta with API keys
Maintainer-led project governance
How to use Antaeus?
Author: Write policies using YAML or JSON
Validate: Test policies against a versioned schema
Evaluate: Choose evaluator routes and return outcomes
Inspect: Trace policy decisions and compare versions
Antaeus's Use Cases
- Marketplace Moderation
- User-Generated Content Review
- Support and AI Replies
- Vendor Onboarding
- Internal Compliance Checks
