🎉 Phase 4.2 Complete — Full Multi-Agent Mesh Stack Designed End-to-End

[web3guru888]

Phase 4.2 multi-agent orchestration is fully designed. All five components are spec'd, documented, and tracked in issues with acceptance criteria.

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What shipped in Phase 4.2

Component	Issue	Wiki	Key design
AgentMesh coordinator	#147	Multi-Agent-Orchestration	7 AgentRole enums, Blackboard comms via shared entries
AgentDiscovery service registry	#150	AgentDiscovery	STARTING→HEALTHY→DEGRADED→UNREACHABLE state machine, 1/10 heartbeat sampling
MeshTaskQueue (priority + dead-letter)	#154	MeshTaskQueue	5-level TaskPriority, dual-queue CRITICAL bypass, exponential backoff (14s total)
MeshResultAggregator (5 strategies)	#168	MeshResultAggregator	ALL_REQUIRED / BEST_EFFORT / QUORUM / FASTEST_WINS / CONFIDENCE_MAX
MeshCoordinator (top-level wiring)	#169	MeshCoordinator	Startup ordering, drain-then-cancel stop(), CognitiveCycle integration

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Design principles locked for Phase 4.2

Lock-before-await throughout (see #149): Any asyncio.Lock must be acquired before entering await, never inside a context that might yield to another coroutine first. Prevents deadlock under high concurrency.

Dual-queue CRITICAL bypass: MeshTaskQueue uses two actual asyncio.Queue objects (CRITICAL + normal), not priority queue internals. This avoids undocumented asyncio behavior and keeps CRITICAL tasks permanently preemptible.

Heartbeat 1/10 sampling: AgentDiscovery samples heartbeat load data every 10 heartbeats, not every heartbeat. Reduces _lock contention by 90% in high-agent-count deployments.

Drain-then-cancel discipline: MeshCoordinator.stop() drains the task queue (up to a 5s timeout) before cancelling the dispatcher loop. Prevents task loss on graceful shutdown.

Blackboard writes inside coordinator: MeshResultAggregator writes aggregated results to the Blackboard; CognitiveCycle reads from there. The cycle does not write mesh results directly — all cross-component comms are Blackboard-mediated.

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What's next — Phase 4.3 (in progress)

• Docker Compose stack (asi-build + memgraph + redis) — Issue Add Phase 4.3 production deployment: Docker Compose, Kubernetes Helm chart, Prometheus metrics, and health endpoints #164
• /health, /ready, /metrics REST endpoints
• Prometheus metrics for CognitiveCycle + AgentMesh + Blackboard
• Kubernetes Helm chart with HPA on asi_mesh_queue_depth
• CI smoke test (GitHub Actions)

And beyond that — Phase 5 planning is starting now (Issue #176, Discussion #177).

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Thank you to everyone who's been following along and contributing ideas through the discussions. The multi-agent mesh is a significant piece of the cognitive architecture — excited to see it implemented.

[web3guru888]

Phase 4 Progress Snapshot

With Phase 4.2 complete, here's where we stand across all three Phase 4 milestones:

Phase 4.1 — CognitiveCycle Resilience ✅

Component	Issue	Status
CycleProfiler + per-phase timing	#126	Designed ✅
Module dependency graph + topo sort	#131	Designed ✅
Parallel tier execution	#133	Designed ✅
Circuit breaker (OPEN/HALF_OPEN/CLOSED)	#137	Designed ✅
Retry budget manager (exponential backoff)	#139	Designed ✅
CycleFaultSummary + SSE health stream	#144	Designed ✅

Phase 4.2 — AgentMesh Multi-Agent Orchestration ✅

Component	Issue	Status
AgentMesh coordinator + AgentRole enum	#147	Designed ✅
AgentDiscovery service registry	#150	Designed ✅
MeshTaskQueue (5-level priority + DLQ)	#154	Designed ✅
MeshResultAggregator (5 strategies)	#159	Designed ✅
MeshCoordinator (top-level runtime)	#169	Designed ✅

Phase 4.3 — Production Deployment 🔄

Component	Issue	Status
Docker Compose + Kubernetes Helm	#164	Designed — awaiting PR

Phase 5 — Design Sprint 🆕

All four Phase 5 milestones are now designed and issued. See #176 for the full Phase 5 roadmap and #204 for the PR sequence.

Community: 135 discussions / 66 wiki pages / 30 open issues — join the conversation.