# Multi-agent SOLUTION_ERP — Master Coordination Guide (7-agent)

> **Architecture:** 7 sub-agents Opus 4.8 1M Max + em main coordinator.
> Pattern: Anthropic Building Effective Agents orchestrator-workers + Cognition "writes single-threaded" hybrid + post-deploy automated watchdog.
> **Upgrade S39 (2026-05-29):** 4→7 agent (split investigator + implementer, +test-specialist) + budget +50% + 5 RAG MCP per agent. Reference BVAAU 7-agent config (adapted, NOT copied — SOLUTION_ERP 2-FE-app fit + 6 skill proven battle-test 38 session). Prior: S20t12 initial 3 + S21t1 +cicd-monitor.

---

## 🎯 Architecture (7 agent)

```
┌──────────────────────────────────────────────────────────────┐
│ EM (Main) — Opus 4.8 1M Max                                   │
│ • Reasoning + write code (single-threaded principle)          │
│ • Schema/UX/architecture decision + cross-stack tight coupling│
│ • Coordinate 7 sub-agents via spawn + SendMessage             │
│ • Synthesize cross-agent findings + commit/push (em main only)│
│ • Fallback solo nếu spawn fail (gotcha #53 truncate / 529)    │
└──────────────────────────────────────────────────────────────┘
        ↓ spawn + keep-alive (Opus 4.8 1M Max inherit each)
  ── RESEARCH (READ) ──────────  ── IMPLEMENT (WRITE) ────────────  ── QUALITY ──────────
  ┌──────────────────┐ ┌───────┐ ┌─────────────────┐ ┌──────────┐ ┌────────┐ ┌─────────┐ ┌────────┐
  │investigator-     │ │invest-│ │implementer-     │ │implement-│ │test-   │ │reviewer │ │cicd-   │
  │codebase          │ │igator-│ │backend          │ │er-       │ │special-│ │         │ │monitor │
  │                  │ │api    │ │                 │ │frontend  │ │ist     │ │         │ │        │
  │ INTERNAL audit   │ │EXTERN-│ │ .NET Domain+App │ │ FE 2 app │ │ tests/ │ │adversa- │ │post-   │
  │ SQL/EF/grep/     │ │AL docs│ │ +Infra+Api      │ │cookie-   │ │dedica- │ │rial pre-│ │deploy  │
  │ reference mirror │ │CVE/lib│ │ entity/CQRS/Mig │ │cutter    │ │ted     │ │commit + │ │Gitea + │
  │                  │ │/cross-│ │ /Controller     │ │mirror    │ │xUnit   │ │live curl│ │bundle  │
  │                  │ │project│ │                 │ │SHA256    │ │        │ │         │ │+ smoke │
  └──────────────────┘ └───────┘ └─────────────────┘ └──────────┘ └────────┘ └─────────┘ └────────┘
       cyan              blue       yellow              orange       purple      red         green
```

---

## 🚨 RULE BẮT BUỘC (S39 updated)

**Em main BẮT BUỘC phân việc cho sub-agent đúng vai trò khi ACCEPT criteria match. Budget +50% → lean toward delegate + parallel, ít em main solo fallback.**

**Workflow forward S39+:**
- Trước mọi task → classify qua decision tree dưới
- Read-only research → **split**: internal codebase audit → `investigator-codebase` · external docs/CVE/lib → `investigator-api` (có thể spawn parallel cả 2)
- WRITE scaffold → **split**: .NET backend → `implementer-backend` · FE 2 app → `implementer-frontend` (parallel khi independent — vd BE entity + FE types cùng lúc)
- Test → **`test-specialist`** dedicated (KHÔNG để implementer kiêm)
- Deploy claim → `cicd-monitor` sau push (skip docs-only gotcha #41)
- Heavy diff / security / wire BE claim → `reviewer` pre-commit

**Em main solo CHỈ khi:** schema/UX/architecture decision · cross-stack tight coupling · bug fix reasoning chain · gotcha #53 fallback (spawn truncate/529 → em main solo reliable, proven S37 BE 700 LOC + FE 4 file).

**Anti-truncation rules (gotcha #53 — 5× occurrence S35-S37):**
- Brief WRITE agent ≤ 8K (heavy spec ~10K → truncate risk). FE tight brief proven 0 truncation S36.
- Curate MEMORY pre-spawn nếu > 25KB (Investigator 32KB S37 → truncate mid-MEMORY).
- Agent keep entry ≤ 1.5K chars (frontmatter rule mỗi agent).
- Em main grep verify manual nếu agent return truncated mid-task.
- 529 Overload transient → em main solo fallback (KHÔNG retry loop).

---

## 🔄 Invocation decision tree (em main apply)

```
├── Read-only INTERNAL audit (codebase/SQL/EF diff/grep > 5 files)?
│     → investigator-codebase (cyan)
│
├── Read-only EXTERNAL (official docs / NuGet-npm CVE / lib eval / cross-project ref)?
│     → investigator-api (blue)
│     → Cả 2 investigator parallel OK khi task cần both (vd "audit current + research best practice")
│
├── WRITE .NET backend (entity/EF Config/Mig/CQRS/Controller/DbInit)?
│     ✓ Spec deterministic · pattern proven >1× · >30min · ≤2 layer
│     → implementer-backend (yellow) [Case 1/2/3/5]
│
├── WRITE FE 2 app (page/types/component cookie-cutter mirror)?
│     ✓ UX flow chốt by em main · spec deterministic
│     → implementer-frontend (orange) [Case 1/2]
│     → BE + FE parallel khi independent (em main chốt DTO shape first)
│
├── WRITE test (xUnit Domain policy / Infra handler / authz regression)?
│     → test-specialist (purple) [test-before bug/critical, test-after feature UAT]
│
├── After push code commit (NOT docs-only)?
│     → cicd-monitor (green) — Gitea poll + bundle hash + Mig prod + smoke
│
├── Adversarial pre-commit / heavy diff / wire BE claim / security?
│     → reviewer (red) — Smart Friend 5-category + live curl
│
├── Quick task < 30 min?  → Em solo direct
│
└── Schema/UX/architecture/cross-stack tight/bug reasoning chain?
      → Em solo (Cognition) + investigator pre-flight optional + reviewer pre-commit
```

---

## 📋 Phân việc matrix — split boundary (CRITICAL)

| Layer / File | Owner |
|---|---|
| `src/Backend/SolutionErp.{Domain,Application,Infrastructure,Api}/**` | **implementer-backend** |
| `fe-admin/src/**` + `fe-user/src/**` | **implementer-frontend** |
| `tests/**` | **test-specialist** |
| Mig design / FK strategy / discriminator / schema | **em main solo** (implementer-backend scaffold sau khi chốt) |
| UX flow (drawer/tab/modal) / page structure | **em main solo** (implementer-frontend scaffold sau khi chốt) |
| Internal SQL/EF/grep audit | **investigator-codebase** |
| External docs/CVE/lib/cross-project | **investigator-api** |
| Pre-commit verify | **reviewer** (NEVER write) |
| Post-deploy verify | **cicd-monitor** (NEVER write) |

**Boundary dứt khoát:** implementer-backend KHÔNG touch FE · implementer-frontend KHÔNG touch BE (chỉ Read DTO shape) · cả 2 implementer KHÔNG viết test (→ test-specialist) · test-specialist reveal prod bug → REPORT em main KHÔNG fix.

---

## 🛠️ Skill assignment (6 skill, re-distributed S39)

| Agent | Skills |
|---|---|
| investigator-codebase | `contract-workflow` + `permission-matrix` + `ef-core-migration` |
| investigator-api | `dependency-audit-erp` |
| implementer-backend | `ef-core-migration` + `permission-matrix` + `contract-workflow` + `form-engine` |
| implementer-frontend | `permission-matrix` |
| test-specialist | `contract-workflow` + `permission-matrix` |
| reviewer | `dependency-audit-erp` + `contract-workflow` + `permission-matrix` |
| cicd-monitor | `iis-deploy-runbook` + `dependency-audit-erp` + `ef-core-migration` |

## 🔧 Tool grant (S39 — +3 RAG MCP per agent)

All 7 agent có 5 RAG MCP: `search_memory` + `search_code` (BM25, prefer over Read full file — tiết kiệm token) + `cross_project_search` + `store_memory` + `list_projects`. Base tools per role (READ: Read/Grep/Glob/Bash [+WebFetch/Search cho api] · WRITE: +Edit/Write/Skill).

---

## 💾 Memory discipline

Each agent `.claude/agent-memory/<name>/MEMORY.md` persistent diary. Spawn auto-inject 200 lines/25KB. Update BEFORE return (BẮT BUỘC, entry ≤ 1.5K chars). 7 folder: investigator-codebase (history từ investigator) · investigator-api (NEW seed) · implementer-backend (history từ implementer) · implementer-frontend (NEW seed) · test-specialist (NEW seed) · reviewer · cicd-monitor.

**End-of-session:** em main SendMessage mỗi agent flush MEMORY → đọc 7 update → synthesize cross-agent → integrate project memory/session log → commit/push.

---

## 📊 Cost reality (budget +50% S39)

| Component | Effective tokens billed (after caching) |
|---|---|
| 7 sub-agents spawn setup | ~1.1M (7 × ~155K cache WRITE) |
| SendMessages cached | ~500K |
| Em main session | ~250K |
| **Total per heavy session** | **~1.85M (~9× solo)** |
| **Optimized (compact + cache + skip trivial + parallel)** | **~1.05M (~5× solo)** |

**+50% budget** (vs prior ~700K opt / ~1.35M heavy → now ~1.05M opt / ~2M heavy ceiling). Max 20× plan absorbs ~5× comfortable. Trade-off justify: split nhẹ hơn mỗi spawn (giảm gotcha #53 truncate) + parallel BE+FE+test (giảm wall-clock) + test-specialist clear coverage gap backlog (quality).

---

## 🎯 Project tunings (SOLUTION_ERP)

**Stack:** .NET 10 Clean Arch + CQRS MediatR + EF Core 10 + SQL Server + 2 React 19 Vite 8 FE + Gitea CI + Windows IIS.

**State (S38 — 2026-05-28):** 40 mig · 84 tables · ~223 endpoints · 53 FE pages · 130 test PASS · 53 gotchas · 27 memory · 6 skills · **7 sub-agents** · Phase 10 COMPLETE 11/11 Plan G-*.

**Windows MAX_PATH:** project path nested + Dropbox-managed → implementer KHÔNG dùng `isolation: worktree`. Default branch OK.

**UAT live mode (Phase 9):** `feedback_uat_skip_verify` — skip `dotnet test` mỗi chunk, vẫn `npm run build` × 2. test-specialist test-after khi UAT confirm; test-before cho bug/critical algo.

---

## 🔗 References
- [Anthropic Building Effective Agents](https://www.anthropic.com/engineering/building-effective-agents)
- [Cognition "Don't Build Multi-Agents"](https://cognition.ai/blog/dont-build-multi-agents)
- BVAAU 7-agent reference: `D:\Dropbox\CONG_VIEC\BENHVIEN_A_AU\SOURCE_CODDE\.claude\agents\` (adapted S39 — split trục + 5 RAG tool; SOLUTION_ERP giữ 6 skill + backend/frontend split thay domain/infra cho 2-FE-app fit)
- Memory: `feedback_per_chunk_commit` · `feedback_uat_skip_verify` · `feedback_audit_reuse_before_clone` · `feedback_implementer_truncation_mitigation` (gotcha #53)

## ⚠️ CLI restart required
Agent definition change (S39 split 4→7) → **anh main restart Claude Code CLI** để registry hot-reload (per S27 lesson — model:inherit + new agent files). Verify post-restart: spawn smoke test mỗi agent mới (investigator-api / implementer-frontend / test-specialist) confirm load OK.