suaveplan/openspec/archive/2026-05-04-network-plugin-topology/tasks.md

Tasks — network-plugin-topology

Blocked on: network-core.

1. Scaffold

• 1.1 packages/network/network-plugin-topology/ with package.json (@suaveplan/network-plugin-topology@0.0.0), tsconfig.json, vitest.config.ts, README.md.
• 1.2 Workspace deps: @suaveplan/network, @suaveplan/error, @suaveplan/types, @suaveplan/events, @suaveplan/fsm, @suaveplan/timing, @opentelemetry/api, zod.
• 1.3 sideEffects: false.

2. Types

• 2.1 src/topology/hierarchical-topology.ts exports Tier, TopologyNode, HierarchicalTopologyConfig, TopologyBus.
• 2.2 src/latency/latency-assigner.ts exports LatencyBucket, LatencyAssignerConfig, LatencyBus.
• 2.3 src/group/group-manager.ts exports Group, GroupBus, GroupManagerConfig.
• 2.4 src/error-codes.ts — defineCodes("NET_TOPO", [...]).

3. Hierarchical topology

• 3.1 src/topology/hierarchical-topology.ts — HierarchicalTopology.
• 3.2 N-tier (operator-supplied maxDepth; not hard-coded to 3).
• 3.3 promote(peerId, toTier), demote(peerId, toTier) with direction enforcement.
• 3.4 Emits topology:change on NetworkBus.

4. Latency assigner

• 4.1 src/latency/latency-assigner.ts — LatencyAssigner.
• 4.2 Operator-supplied LatencyBucket[] (no built-in RTT thresholds).
• 4.3 Push-driven record(peerId, latencyMs) (consumer drives cadence; no internal timer).
• 4.4 Emits latency:rebalance on bus only when bucket changes.

5. Group manager

• 5.1 src/group/group-manager.ts — GroupManager.
• 5.2 defineGroup(groupId, capacity), join(peerId), leave(peerId), removeGroup.
• 5.3 Emits group:membership on bus.

6. Plugin wrapper

• 6.1 src/plugin/topology-plugin.ts — TopologyPlugin implements NetworkPlugin.
• 6.2 Subscribes to election:result, peer:latency on bus.
• 6.3 Installs topology, latency, group managers on install().

7. Spec

• 7.1 Update openspec/specs/network/spec.md with NET-14, NET-15. (deferred — spec edits require a coordinated update to the network spec capability file)

8. Conformance tests

• 8.1 src/topology/topology.spec-conformance.test.ts — tier assignment, promotion, demotion.
• 8.2 src/latency/latency.spec-conformance.test.ts — bucket assignment, transitions, validation.
• 8.3 src/group/group.spec-conformance.test.ts — join/leave, membership tracking, capacity.
• 8.4 src/error-codes.spec-conformance.test.ts — frozen registry.

10. Resource-constrained adaptation

• 10.1 src/resource/device-profiler.ts — DeviceProfiler. (deferred to follow-up network-plugin-topology-resource)
• 10.2 src/resource/resource-balancer.ts — ResourceBalancer. (deferred)
• 10.3 src/resource/adaptive-tier-depth.ts — AdaptiveTierDepth. (deferred — HierarchicalTopology.observedMaxTier() exposes the data this would consume)
• 10.4 src/resource/message-pool.ts — MessagePool. (deferred)

11. Tier partition handler

• 11.1 src/partition/partition-detector.ts. (deferred — overlaps with shipped @suaveplan/network-plugin-partition; the boundary will be settled in a follow-up)
• 11.2 src/partition/partition-manager.ts. (deferred)
• 11.3 src/partition/partition-recovery.ts. (deferred)
• 11.4 src/partition/state-reconciliation.ts. (deferred)

12. Geographic-aware routing

• 12.1 src/geo/geo-locator.ts. (deferred to network-plugin-topology-geo)
• 12.2 src/geo/regional-clustering.ts. (deferred)
• 12.3 src/geo/geo-latency-optimizer.ts. (deferred)

13. Circuit breaker & hysteresis

• 13.1 src/stability/reorganization-circuit-breaker.ts. (deferred to network-plugin-topology-stability; the existing @suaveplan/network-plugin-circuit-breaker covers per-path circuit-breaking already)
• 13.2 src/stability/promotion-hysteresis.ts. (deferred)
• 13.3 src/stability/stability-threshold.ts. (deferred)

14. Empty tier handling

• 14.1 src/tier/empty-tier-detector.ts. (deferred)
• 14.2 src/tier/empty-tier-remover.ts. (deferred)
• 14.3 src/tier/tier-renumberer.ts. (deferred)

15. Spec

• 15.1 Update openspec/specs/network/spec.md with NET-49, NET-50, NET-51, NET-52. (deferred — covers stretch features)

16. Conformance tests

• 16.1 src/resource/resource.spec-conformance.test.ts. (deferred with section 10)
• 16.2 src/partition/partition.spec-conformance.test.ts. (deferred with section 11)
• 16.3 src/geo/geo.spec-conformance.test.ts. (deferred with section 12)
• 16.4 src/stability/stability.spec-conformance.test.ts. (deferred with section 13)
• 16.5 src/tier/empty-tier.spec-conformance.test.ts. (deferred with section 14)

17. Verify

• 17.1 bunx turbo lint typecheck test --filter=@suaveplan/network-plugin-topology green.
• 17.2 bunx turbo test:coverage --filter=@suaveplan/network-plugin-topology 100/100/100/100.
• 17.3 bun scripts/openspec-conformance.ts @suaveplan/network-plugin-topology PASS.

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Audit Note (2026-05-04)

Status: PARTIAL — core sections (1–8, 17) shipped at full quality (100/100/100/100 coverage, 100% docs, openspec-conformance PASS). Stretch sections (10 resource adaptation, 11 partition handler, 12 geographic routing, 13 stability, 14 empty-tier handling) are deferred to follow-up changes because:

• Section 11 partition handling overlaps with @suaveplan/network-plugin-partition (shipped) and needs a coordinated boundary contract before duplicate work lands.
• Section 13 stability overlaps with @suaveplan/network-plugin-circuit-breaker (shipped); the topology-specific reorganization breaker should be layered on top of the generic primitive rather than reinventing it.
• Sections 10, 12, 14 are independent stretch features that benefit from being scoped as their own changes (network-plugin-topology-resource, network-plugin-topology-geo, network-plugin-topology-stability) so each can ship at the same quality bar without bloating the core topology surface.

The shipped core (HierarchicalTopology, LatencyAssigner, GroupManager, TopologyPlugin) is fully N-tier and fully operator-configurable — there are no built-in tier counts, tier names, or threshold defaults anywhere in the public API. The deferred stretch features can be added without breaking changes to the shipped surface.