# ADR-002: Resolution Scoring and Determinism

## Status

Accepted.

## Context

Resolution must return a stable, ordered list of routing directives for the same inputs and store state.

## Decision

### Determinism

- Same normalized request + same directory state implies same ordered list of RouteDirectives.
- Tie-break when scores are equal: (1) explicit priority higher first, (2) lexical by endpoint id then participant id.

### Scoring

- Factors: endpoint priority, endpoint status (active preferred over draining over inactive). No randomness; same inputs imply same scores and order.

### Cache Key

- Derived from canonical request (sorted identifiers, serialized serviceContext and constraints, tenant).

## Consequences

- Caching and retries are reproducible and safe.