# Policy Path/Scope Schema Prep — PREP-POLICY-ENGINE-29-002

Status: Draft (2025-11-21)
Owners: Policy Guild · SBOM Service Guild
Scope: Define path/scope-aware evaluation schema (inputs/outputs) for POLICY-ENGINE-29-002 so downstream metrics, overlays, and simulations can bind to stable shapes.

Needs / open points
- Enumerate canonical path selectors (SBOM node types, package coords, file paths) and disambiguation rules.
- Decide scope precedence and evaluation order (lexical vs explicit priority).
- Provide JSON Schema for evaluation request/response, including error surfaces and determinism requirements (ordering, nullability, defaults).
- Align with SBOM Service envelopes and Graph coordinates to avoid divergent node IDs.
- Sample payloads for common cases: single package, path tree, mixed ecosystem nodes.

Next actions
- Draft initial JSON Schema and sample payloads once SBOM Service shares coordinate mapping rules.
- Review with Observability Guild to ensure fields required by metrics/logging (29-004) are present.
- Publish finalized schema to unblock 29-003 and downstream tasks.