> For the complete documentation index, see [llms.txt](https://he-said.tdreyno.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://he-said.tdreyno.com/etc/faq.md).

# F.A.Q.

## Is this policy engine RBAC-only?

It is rule-algebra based. You can express RBAC, ABAC (ability-based access control), ReBAC-style checks, and mixed constraints.

## Why are terms symbols instead of strings?

Symbols avoid collisions and preserve strong typing in TypeScript.

## Do I have to use the in-memory adapter?

No. evaluator(...) accepts any adapter that implements EvaluatorAdapter.

## Can predicates be async?

Yes. Unary predicates can return boolean or Promise.

## What does evaluateWithProof provide?

It returns ok, the evaluated rule, and optional adapter-specific details.

## How do I validate recursive rule references?

Use validateStratifiedNegation(rule) before evaluation if you want explicit validation.


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