juliaz-debug — Cross-System Diagnostics

When something breaks in a multi-agent system, the problem is almost never where you first look. This skill provides systematic diagnostic procedures for the juliaz_agents ecosystem.

First Response: Quick Health Scan

Before diving into any specific issue, always run this first:

bash

# 1. What's running?
pm2 list 2>&1

# 2. Docker containers
docker ps --format "table {{.Names}}\t{{.Status}}\t{{.Ports}}"

# 3. Who's on which port?
lsof -i :3000 -i :3001 -i :3002 -i :3003 -P -n 2>&1

# 4. Bridge health (the most common failure point)
curl -s http://localhost:3001/health 2>&1

# 5. Backend health
curl -s http://localhost:3000/health 2>&1

# 6. Cowork MCP health
curl -s http://localhost:3003/health 2>&1

This gives you the system state in 10 seconds. Read all results before forming a hypothesis.

Diagnostic Decision Tree

code

"Julia isn't responding to Telegram messages"
├── Is bridge running? (pm2 list → check bridge status)
│   ├── NO → pm2 restart bridge → test again
│   └── YES → Are there pending messages?
│       ├── Check: curl http://localhost:3001/health (look at queue counts)
│       └── Messages stuck in "pending"?
│           ├── YES → Orchestrator not polling
│           │   ├── Is orchestrator running? (pm2 list)
│           │   │   ├── NO → pm2 restart orchestrator
│           │   │   └── YES → Check orchestrator logs: pm2 logs orchestrator --lines 50
│           │   │       ├── API key error → Check .env.secrets
│           │   │       ├── Rate limit (429) → Wait; check POLL_INTERVAL_MS
│           │   │       └── Connection error → Check bridge endpoint in orchestrator config
│           └── Messages stuck in "processing"?
│               └── Orchestrator picked up but didn't reply
│                   ├── Claude API timeout → Check pm2 logs orchestrator for timeout errors
│                   ├── Tool execution error → Check for failed tool calls in logs
│                   └── GPT-4o fallback also failed → Both APIs are down or keys expired

"Messages arrive but Julia's replies don't reach Telegram"
├── Is OpenClaw running? → openclaw health
│   ├── NO → openclaw gateway start --force
│   └── YES → Is it polling for replies?
│       ├── Check bridge: curl http://localhost:3001/health (look at openclaw heartbeat)
│       └── If stale heartbeat → OpenClaw relay skill may be broken
│           └── Check: openclaw/skills/julia-relay/ for issues

"Frontend chat not working"
├── Is frontend running? → curl http://localhost:3002
├── Is frontend chat endpoint OK? → curl -X POST http://localhost:3002/api/chat
├── Check: OPENAI_API_KEY in environment (frontend uses GPT-4o)
└── Check: frontend/app/api/chat/route.ts for errors

"Cowork MCP returning errors"
├── Is it running? → curl http://localhost:3003/health
├── Check API key: ANTHROPIC_API_KEY in .env.secrets
├── Check logs: pm2 logs cowork-mcp --lines 50
└── Common: 401 = bad key, 429 = rate limit, 500 = bug in tool handler

Reading Logs Effectively

PM2 Logs

bash

# Last 50 lines for a service
pm2 logs orchestrator --lines 50
pm2 logs bridge --lines 50

# All logs, live tail
pm2 logs

# Error logs only (separate file)
# Located at: ~/.pm2/logs/<service>-error.log

What to look for in orchestrator logs:

•Polling bridge... — confirms it's alive and checking
•Processing message from chatId: ... — message was picked up
•Claude response: — successful reply generated
•Falling back to GPT-4o — Claude API failed, trying backup
•Error: — any error with stack trace
•Rate limited or 429 — too many API calls
•Timeout — API call took >30s

What to look for in bridge logs:

•POST /incoming — message received from OpenClaw
•GET /pending-reply/:chatId — OpenClaw polling for replies
•MCP tool call: — orchestrator calling bridge tools
•Queue size: — how many messages are buffered

What to look for in cowork-mcp logs:

•Tool call: — which tool was invoked
•Anthropic API error: — what went wrong with Claude
•Truncated response — output was over 25K chars (content lost!)

Common Failure Patterns

1. The Silent Death

Symptom: PM2 shows service as "online" but it's not actually working. Diagnosis: Check restart count in pm2 list. If it's high (>5), the service is crash-looping. Fix: pm2 logs <service> --lines 100 to find the crash cause. Often: missing env var, port conflict, or syntax error after a code change.

2. The Rate Limit Spiral

Symptom: Orchestrator logs show repeated 429 errors, Julia stops responding. Diagnosis: Orchestrator has exponential backoff (up to 55s), but if POLL_INTERVAL_MS is too low, it can hammer the API. Fix: Increase POLL_INTERVAL_MS in ecosystem config. Wait for rate limit to clear (usually 60s). The orchestrator honors Retry-After headers.

3. The Queue Jam

Symptom: Messages pile up in bridge, none get processed. Diagnosis: curl http://localhost:3001/health — check pending count. If messages are in "processing" state, the orchestrator grabbed them but never replied. Fix: Check orchestrator logs. If it crashed mid-processing, messages stay in "processing" forever. Manual fix: edit bridge/data/queue.json and reset status to "pending".

4. The Memory Leak

Symptom: Service gradually slows down, then crashes after hours/days. Diagnosis: Check PM2 memory usage: pm2 monit. If a service exceeds ~500MB, it's likely leaking. Fix: PM2 has max_memory_restart — add to ecosystem config if not present. For bridge specifically, the queue.json file grows unbounded (no pruning of old replied messages).

5. The Docker Ghost

Symptom: Backend returns connection errors even though pm2 list shows everything "online". Diagnosis: Docker containers may have stopped (Docker Desktop restart, system reboot). Fix: docker ps to check. If containers are gone: cd backend && docker compose up -d.

6. The Fallback Loop

Symptom: Julia responds but much slower than usual, and responses feel different. Diagnosis: Claude API is failing and orchestrator is falling back to GPT-4o every time. Fix: Check orchestrator logs for the specific Claude error. Common: expired API key, billing issue, or Anthropic outage. Check https://status.anthropic.com.

7. The Hardcoded Path Break

Symptom: Email sending fails, or tools that call external scripts fail. Diagnosis: The orchestrator has hardcoded paths like /Users/raphael/Documents/Devs/juliaz_agents/openclaw/skills/email-aberer. Fix: If running on a different machine or path, update the paths in orchestrator/src/tools.ts.

Queue Inspection

The bridge queue is a JSON file. Direct inspection when the API is misbehaving:

bash

# View queue contents
cat bridge/data/queue.json | python3 -m json.tool

# Count messages by status
cat bridge/data/queue.json | python3 -c "
import json, sys
q = json.load(sys.stdin)
msgs = q.get('messages', [])
from collections import Counter
c = Counter(m.get('status') for m in msgs)
for status, count in c.items():
    print(f'{status}: {count}')
print(f'Total: {len(msgs)}')
"

Manually unstick messages

If messages are stuck in "processing":

bash

# Read, modify status, write back
python3 -c "
import json
with open('bridge/data/queue.json', 'r') as f:
    q = json.load(f)
for m in q.get('messages', []):
    if m.get('status') == 'processing':
        m['status'] = 'pending'
with open('bridge/data/queue.json', 'w') as f:
    json.dump(q, f, indent=2)
print('Done — stuck messages reset to pending')
"

Database Diagnostics

bash

# Check memory count
curl -s http://localhost:3000/memories | python3 -c "import sys,json; m=json.load(sys.stdin); print(f'{len(m)} memories')"

# Check task count
curl -s http://localhost:3000/tasks | python3 -c "import sys,json; t=json.load(sys.stdin); print(f'{len(t)} tasks')"

# Check usage/token consumption
curl -s http://localhost:3000/usage | python3 -c "
import sys, json
u = json.load(sys.stdin)
total = sum(r.get('totalTokens', 0) for r in u)
print(f'{len(u)} usage records, {total:,} total tokens')
"

# Check recent logs
curl -s http://localhost:3000/logs | python3 -c "
import sys, json
logs = json.load(sys.stdin)
for l in logs[-10:]:
    print(f'[{l.get(\"level\",\"?\")}] {l.get(\"source\",\"?\")} — {l.get(\"message\",\"?\")[:80]}')
"

Network Connectivity Check

When services can't talk to each other:

bash

# Test bridge from orchestrator's perspective
curl -s http://localhost:3001/health

# Test backend from bridge's perspective
curl -s http://localhost:3000/health

# Test cowork-mcp from orchestrator's perspective
curl -s http://localhost:3003/health

# Test MCP endpoint specifically
curl -s -X POST http://localhost:3001/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"tools/list","id":1}'

Escalation Path

If you can't fix it with these tools:

•Check recent git changes: git log --oneline -10 — was something deployed recently?
•Diff against working state: git diff HEAD~5 — what changed?

•Nuclear option: Stop everything, rebuild, restart fresh:

bash

pm2 delete all
cd backend && docker compose down
cd backend && npm run build
cd bridge && npm run build
cd orchestrator && npm run build
cd cowork-mcp && npm run build
cd frontend && npx next build
cd backend && docker compose up -d
pm2 start ecosystem.dev.config.js
openclaw gateway start --force