# Milestone 0 · Phase 2 — Tooling & Diagnostics

**Objective:** give developers minimal introspection tooling that works even when tidalDB is embedded. This phase adds `tidalctl` plus a metrics endpoint so later milestones can reuse the same plumbing.

**Success criteria**
- `tidalctl status --path <dir>` prints build info, WAL seq, open segments, and builder config snapshot.
- Metrics exporter (text or JSON) exposes uptime, WAL queue depth, and build hash; tag everything with `partition_id=0` to future-proof multi-node rollouts.
- Tooling uses the same `Paths` helper from Phase 1 — no duplicated layout logic.

**Dependencies:** Phase 1 (stable directories + config serialization).

**Unblocks:** future performance debugging + automated tests that assert health via CLI before/after workloads.
