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Deterministic Evaluator Prep — PREP-POLICY-ENGINE-20-002-BUILD-DETERMINISTIC

Status: Draft (2025-11-20) Owners: Policy Guild Scope: Capture contract and constraints for deterministic policy evaluator before implementation.

Requirements

  • Deterministic execution: no wall-clock, no RNG, no network; inputs must be content-addressed.
  • Ordering: lexical rule ordering; first-match semantics; stable reduction order over inputs.
  • Safe value types: disallow floats where not needed; prefer decimal with fixed scale.
  • Timestamps: if required, use supplied context.now injected value, not system clock.

Deliverables

  • Document evaluator contract and constraints in docs/modules/policy/design/deterministic-evaluator.md.
  • Provide sample config and test vectors under docs/modules/policy/samples/deterministic-evaluator/ (hashes recorded in the design doc).

Handoff

Use this doc as the prep artefact for PREP-POLICY-ENGINE-20-002-BUILD-DETERMINISTIC. Once constraints and samples are frozen, mark the sprint task DONE and unblock POLICY-ENGINE-20-002.