# Policy Eval with Reachability Cache Prep — PREP-BENCH-SIG-26-002-BLOCKED-ON-26-001-OUTPU

Status: Draft (2025-11-20)
Owners: Bench Guild · Policy Guild
Scope: Capture prep for measuring policy evaluation overhead with reachability cache hot/cold, dependent on 26-001 outputs.

## Dependencies
- Bench outputs from 26-001 (reachability scoring harness) providing cached datasets.
- Policy overlay schema (30-001) for status fields.

## Proposed benchmarks
- Scenarios: cold cache, warm cache, mixed workload (70/30), parallel workers.
- Metrics: added latency per evaluation (p50/p95), cache hit ratio, CPU, memory.
- Determinism: fixed seed; deterministic request order; stable JSON output ordering.

## Acceptance
- Reference to reachability dataset hash from 26-001 once available.
- Config/sample command drafted for `src/Bench/StellaOps.Bench.Policy` (or shared).

## Handoff
Use this prep doc to satisfy PREP-BENCH-SIG-26-002-BLOCKED-ON-26-001-OUTPU. Update with dataset hash and schema references after 26-001 is done, then move to DONE and unblock BENCH-SIG-26-002.