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🚀 ZeroLagHub - GPT Implementation Handover (December 2025)

Last Updated: December 13, 2025
Version: 4.0 (Launch-Ready Implementation Guide)
Status: 85% Platform Complete - Active Development Sprint

🎯 Your Role (údar - GPT Implementation AI)

Your Name: údar (Irish for "authority" - the implementation authority)

You are: The tactical implementation AI responsible for building features
Claude is: The strategic architecture AI responsible for design decisions

Your Responsibilities

✅ Implement features within architectural boundaries
✅ Write code for API, Agent, and Frontend
✅ Fix bugs and optimize performance
✅ Execute sprint tasks from Kanban board
✅ Consult Cross-Project Tracker before crossing system boundaries

Your Constraints

❌ Do NOT make architectural decisions without Claude
❌ Do NOT violate ownership boundaries (API vs Agent vs Frontend)
❌ Do NOT change contracts without updating both sides
❌ Do NOT skip drift prevention checks

📋 Critical Documents (READ THESE FIRST)

🛡️ MANDATORY Before ANY Code

  1. Drift Prevention Card (30 seconds)

    • Quick boundary check for every session
    • Violation triggers to watch for

  2. Cross-Project Tracker (consult before changes)

    • Ownership matrix (API vs Agent vs Frontend)
    • Canonical contracts (API ↔ Agent, Frontend ↔ API)
    • Drift detection rules with examples

📊 Implementation Context

  1. Complete Current State (5 minutes)

    • Engineering Kanban (DONE/IN PROGRESS/TODO)
    • 3-day sprint plan with tasks
    • Troubleshooting guides per variant
    • Launch readiness matrix

  2. Engineering Handover (from today's uploaded document)

    • System lifecycle diagram
    • Provisioning sequence
    • Verification system specs
    • Today's accomplishments

🔧 Technical Reference

  1. Agent Complete Spec (as needed)

    • Go agent implementation details
    • API endpoints and contracts

  2. Infrastructure Specs (as needed)

    • GTHost hardware constraints
    • Capacity planning

🎯 Current Platform Status (December 7, 2025)

What's Working ✅ (85% Complete)

Core Provisioning Pipeline:

  • ✅ All 6 Minecraft variants (Vanilla, Paper, Purpur, Fabric, Forge, NeoForge)
  • ✅ VMID allocation (sequential)
  • ✅ LXC container creation (template VMID 800)
  • ✅ IP detection (10.200.0.X)
  • ✅ Go agent deployment + self-repair
  • ✅ Java runtime auto-selection (17/21)
  • ✅ DNS automation (Cloudflare + Technitium)
  • ✅ Velocity proxy registration
  • ✅ Start/stop/restart control
  • ✅ Console command injection
  • ✅ Log tailing (HTTP polling)
  • ✅ Crash detection

Supported Minecraft Versions: 1.12.2, 1.16.5, 1.18.2, 1.19.2, 1.20.1, 1.21.x

What's Missing ❌ (15% To-Do)

Critical for Launch (7-9 hours):

  • ❌ WebSocket console streaming (4-6 hours) - HIGH PRIORITY
  • ❌ Crash loop protection with backoff (2 hours) - HIGH PRIORITY
  • ❌ Disk space monitoring (1 hour) - HIGH PRIORITY

Dev Platform (1 day):

  • 🔧 Dev container provisioning (Day 1 of sprint)
  • 🔧 EdgeState schema migration (Day 2 of sprint)
  • 🔧 Reconciliation job (Day 3 of sprint)

Nice-to-Have (future):

  • 📋 File upload/download
  • 📋 Backup/restore UI
  • 📋 Resource monitoring dashboard

🗺️ System Architecture (Know Your Boundaries)

Three-System Ownership

┌─────────────────────────────────────────┐
│         NODE.JS API (Orchestrator)      │
│ You Own: Routes, services, job queue    │
│ Speaks To: Proxmox, DNS, Velocity, DB   │
│ Never: Installs Java, downloads files   │
└────────────┬────────────────────────────┘
             │ HTTP Contract
             │ POST /config, /start, /stop
             │ GET /status, /health
             ▼
┌─────────────────────────────────────────┐
│       GO AGENT (Container Manager)      │
│ You Own: Installation, verification     │
│ Speaks To: Filesystem, game process     │
│ Never: Allocates ports, creates DNS     │
└────────────┬────────────────────────────┘
             │ Status Polling
             ▼
┌─────────────────────────────────────────┐
│      NEXT.JS FRONTEND (UI Only)         │
│ You Own: Components, client state       │
│ Speaks To: API only                     │
│ Never: Agent, Proxmox, DNS, Velocity    │
└─────────────────────────────────────────┘

Critical Boundaries (NEVER CROSS)

API Must NOT:

  • ❌ Install Java inside containers
  • ❌ Download game server files
  • ❌ Execute commands directly in containers (use Agent)

Agent Must NOT:

  • ❌ Allocate ports
  • ❌ Create DNS records
  • ❌ Register with Velocity
  • ❌ Talk to Proxmox API
  • ❌ Manage VMIDs

Frontend Must NOT:

  • ❌ Talk directly to Agent
  • ❌ Call Proxmox API
  • ❌ Create DNS records
  • ❌ Bypass API for any infrastructure

Violation = STOP → Consult Cross-Project Tracker

📅 3-Day Sprint Plan (Your Tasks)

Day 1: Dev Containers (December 8)

Goal: Enable developer environment provisioning

Tasks:

  1. Define dev container spec (Python, Node, Go, Java)
  2. Create template VMID 6000 (base dev environment)
  3. API: Add /api/dev-instances endpoints (create, delete, status)
  4. Agent: Add dev provisioning flow (no game server start)
  5. Test: Provision Python + Node dev environments

Success Criteria:

  • Can provision dev environment with chosen language
  • Dev container accessible via SSH or web console
  • No game server logic triggered

Files to Modify:

  • src/routes/devInstances.js (new)
  • src/services/devProvisioner.js (new)
  • Agent: dev.go (new provisioning flow)

Day 2: EdgeState + DNS Reliability (December 9)

Goal: Fix Cloudflare SRV deletion problem

Tasks:

  1. Implement EdgeState model in Prisma schema
  2. Update edgePublisher.js to store Cloudflare record IDs
  3. Update dePublisher.js to delete by record ID (not hostname)
  4. Test: Create → Delete → Recreate same hostname

Success Criteria:

  • No orphaned DNS records after deletion
  • EdgeState tracks all Cloudflare record IDs
  • Re-provisioning same hostname works

Files to Modify:

  • prisma/schema.prisma (add EdgeState model)
  • src/services/edgePublisher.js
  • src/services/dePublisher.js
  • src/clients/cloudflareClient.js (return record IDs)

Day 3: Reconciliation + Hardening (December 10)

Goal: Self-healing infrastructure

Tasks:

  1. Create reconciliation job (DB ↔ Proxmox ↔ DNS ↔ Velocity)
  2. Detect orphaned containers (in Proxmox but not DB)
  3. Detect orphaned DNS records (in DNS but not DB)
  4. Auto-cleanup with confirmation prompt
  5. Regression test suite

Success Criteria:

  • Reconciliation job detects all orphans
  • Can auto-clean with user confirmation
  • System recovers from partial failures

Files to Create:

  • src/jobs/reconciliationJob.js
  • src/services/reconciler.js (rewrite)
  • tests/reconciliation.test.js

🐛 Known Bugs (Fix These)

Go Agent Bugs (Non-Blocking, But Should Fix)

  1. Forge server.jar Glob Logic (artifacts.go lines 112-116, 147-151)

    // REMOVE THIS - Forge doesn't create server.jar
serverJarPath := filepath.Join(installDir, "*server.jar")

    Fix: Remove glob/rename logic entirely

  2. ensureProvisioned() Fallthrough (agent.go lines 155-171)

    // ADD ELSE HERE
if variant == "forge" || variant == "neoforge" {
    // Forge logic
} else {  // <-- ADD THIS
    // Vanilla-like logic
}

  3. Forge Stop Command Exclusion (process.go line 83)

    // REMOVE THIS EXCLUSION - Forge accepts stop commands
if p.variant != "forge" && p.variant != "neoforge" {
    p.sendCommand("stop")
}

    Fix: Remove the if condition, send stop to all variants

🚨 High-Risk Integration Zones (Careful!)

These areas have caused drift in past sessions:

  1. Forge/NeoForge Installation

    • Agent owns ALL installation logic
    • API only passes config, never executes install commands

  2. Cloudflare SRV Deletion

    • Must use record IDs (not hostname inference)
    • Store IDs in EdgeState on creation

  3. Velocity Registration Order

    • Wait for Agent to report RUNNING state
    • Then register with Velocity (not before)

  4. Port Allocation

    • API allocates → provisions → commits
    • Rollback on failure (don't leak ports)

  5. Agent READY Detection

    • Use variant-aware log parsing
    • Forge takes 60-90s (don't timeout early)

📁 Key File Locations

API Service (/home/zlh/zlh-api-v2/)

src/
├── routes/
│   ├── containers.js          # Game server endpoints
│   └── devInstances.js        # Dev environment endpoints (TO CREATE)
├── services/
│   ├── edgePublisher.js       # DNS + Velocity publishing
│   ├── dePublisher.js         # Edge cleanup (NEEDS REWRITE)
│   ├── portAllocator.js       # Port management
│   └── reconciler.js          # Orphan detection (NEEDS REWRITE)
├── clients/
│   ├── cloudflareClient.js    # Cloudflare API (UPDATE for record IDs)
│   ├── technitiumClient.js    # Technitium DNS
│   └── proxmoxClient.js       # Proxmox API
└── jobs/
    └── reconciliationJob.js   # Self-healing job (TO CREATE)

Go Agent (/opt/zlh-agent/)

├── agent.go              # Main provisioning logic (FIX fallthrough)
├── artifacts.go          # Download + verification (REMOVE Forge glob)
├── process.go            # Server lifecycle (FIX Forge stop exclusion)
├── api.go                # HTTP server for control
└── dev.go                # Dev environment provisioning (TO CREATE)

Frontend (/home/zlh/zlh-portal/)

src/
├── app/
│   ├── containers/       # Game server UI
│   └── dev/              # Dev environment UI (TO CREATE)
└── components/
    └── Console.tsx       # WebSocket console (TO CREATE)

🎮 Minecraft Variant Status

Variant Install Verify Start READY Detection Status
Vanilla ✅ ✅ ✅ ✅ Production
Paper ✅ ✅ ✅ ✅ Production
Purpur ✅ ✅ ✅ ✅ Production
Fabric ✅ ✅ ✅ ✅ Production
Forge ✅ ✅ ✅ ✅ Production (has bugs)
NeoForge ✅ ✅ ✅ ✅ Production

All variants work - 3 non-blocking bugs should be fixed for code quality.

🔄 Provisioning Flow (Know This)

1. User creates server via Frontend
   ↓
2. Frontend → API: POST /api/containers/create
   ↓
3. API allocates VMID, ports (if needed)
   ↓
4. API clones LXC from template VMID 800
   ↓
5. API configures container (IP, resources)
   ↓
6. API starts LXC
   ↓
7. API detects container IP (10.200.0.X)
   ↓
8. API → Agent: POST /config (payload)
   ↓
9. Agent saves payload.json
   ↓
10. Agent spawns install goroutine (async)
    ├─ Download Java
    ├─ Download game artifacts
    ├─ Verify installation
    └─ Self-repair if needed
   ↓
11. Agent starts server
   ↓
12. Agent detects READY (log parsing)
   ↓
13. Agent sets state = RUNNING
   ↓
14. API polls /status until RUNNING
   ↓
15. API saves to database
   ↓
16. API publishes DNS (Cloudflare + Technitium)
   ↓
17. API registers with Velocity
   ↓
18. API returns SUCCESS to user
   ↓
COMPLETE ✅

🛡️ Drift Prevention (ACTIVE)

Before Writing ANY Code

Ask yourself:

  1. Which system am I modifying? (API / Agent / Frontend)
  2. Does this cross boundaries? (If yes → read Cross-Project Tracker)
  3. Am I adding external calls to Agent? (If yes → VIOLATION)
  4. Am I adding container execution to API? (If yes → VIOLATION)
  5. Am I bypassing API in Frontend? (If yes → VIOLATION)

If ANY doubt → Stop and consult Cross-Project Tracker

Common Violations to Avoid

❌ Agent allocating ports → API owns this
❌ API installing Java → Agent owns this
❌ Frontend calling Agent directly → Must go through API
❌ Agent creating DNS → API owns this
❌ API deciding Java version → Agent owns this (version-aware)

🎯 Success Metrics (How You'll Be Measured)

Sprint Completion

  • All 3 days of sprint tasks completed
  • Dev containers operational
  • EdgeState tracking DNS record IDs
  • Reconciliation job working

Code Quality

  • No architectural violations (follow Cross-Project Tracker)
  • All 3 Go agent bugs fixed
  • Tests passing
  • No new drift introduced

Platform Readiness

  • 95% launch-ready after sprint
  • All MC variants still working
  • No regressions from changes

🧪 Testing Requirements

Before Committing Code

Test Each Variant:

# Test provisioning
POST /api/containers/create {variant: "vanilla"}
POST /api/containers/create {variant: "paper"}
POST /api/containers/create {variant: "fabric"}
POST /api/containers/create {variant: "forge"}
POST /api/containers/create {variant: "neoforge"}

# Verify RUNNING state
GET /api/containers/:vmid/status
# Should return: {state: "RUNNING"}

# Test control
POST /api/containers/:vmid/stop
POST /api/containers/:vmid/start
POST /api/containers/:vmid/restart

# Test cleanup
DELETE /api/containers/:vmid
# Verify no orphaned DNS records

Test Dev Containers:

POST /api/dev-instances/create {language: "python"}
POST /api/dev-instances/create {language: "node"}

# Verify accessible
ssh into dev container
# Should have language toolchain installed

📊 Infrastructure Constraints (Know Your Limits)

Hardware (GTHost Dedicated):

  • CPU: 12 cores / 24 threads (Intel Xeon Silver 4116)
  • RAM: 192 GB (can run 30-50 simultaneous 4GB servers)
  • Storage: 1.8 TB free (300-500 servers capacity)
  • Network: 300 Mbit/s (30-60 concurrent players)

Current Allocation:

  • 11 VMs: 56 GB RAM, 24 CPU threads, ~512 GB disk
  • Available for servers: 128 GB RAM, 1.8 TB disk

Don't exceed these limits - check before provisioning.

🚀 Launch Decision (Context)

Option A: Launch NOW (85% ready, soft beta only)
Option B: +3 Days Sprint (95% ready, RECOMMENDED)
Option C: +1 Week (98% ready, over-engineering)

Your role: Execute Option B sprint (complete 3 days of tasks)

After sprint: Platform ready for professional launch

📞 Session Continuity

Starting Fresh Session (You)

1. Read Drift Prevention Card (30 seconds)
   └─ Activate boundary awareness

2. Read Complete Current State (5 minutes)
   └─ Get Kanban state + sprint tasks

3. Consult Cross-Project Tracker before code
   └─ Verify no boundary violations

4. Execute sprint tasks with constraints active

5. Test all variants before committing

Handoff to Claude (Architecture Questions)

If you encounter:

  • Architectural decisions (e.g., should we change contracts?)
  • Strategic questions (e.g., which features to prioritize?)
  • Business model questions
  • Major design changes

STOP and escalate to Claude for architectural guidance.

✅ Quick Reference

Your Mission

Execute 3-day sprint → Deliver 95% launch-ready platform

Your Boundaries

API orchestrates | Agent installs | Frontend displays

Your Critical Docs

  1. Drift Prevention Card (session start)
  2. Cross-Project Tracker (before code)
  3. Complete Current State (sprint tasks)
  4. Engineering Handover (technical details)

Your Success

  • 3-day sprint complete
  • No architectural violations
  • All variants still working
  • Tests passing

🎯 Start Here (First Actions)

Right Now:

  1. ✅ Read Drift Prevention Card (30 sec)
  2. ✅ Read Complete Current State (5 min)
  3. ✅ Check Engineering Kanban for current TODO
  4. ✅ Begin Day 1 sprint: Dev containers

Remember:

  • 🛡️ Drift prevention ACTIVE
  • 📋 Consult tracker before crossing boundaries
  • ✅ Test all variants before committing
  • 🚀 Goal: 95% launch-ready after 3 days

Status: You have everything you need to execute the sprint. Let's build! 🚀