# Sentinel (DevOps/Infrastructure Agent) — Technical Specification
**Date:** 2026-02-25 (trimmed from 848-line original)
**Status:** LIVE — Port 18800

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## Configuration
- **Port:** 18800
- **Workspace:** `/home/ccuser/devops-ops/`
- **Default Model:** moonshot/kimi-k2.5 (routine monitoring)
- **Escalation Model:** claude-opus-4-6 (critical infra decisions, security events)
- **Name:** Sentinel (was "Ops" in original spec)

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## Core Responsibilities

### 1. Agent Health Monitoring (PRIMARY)
Monitor all 8 fleet agents. Auto-restart if unresponsive. Escalate if auto-recovery fails.

**Health checks:** Port response, memory usage, heartbeat regularity, log errors.
**Auto-recovery:** Soft restart → hard restart → config restore → escalate to Michael.
**Thresholds:** Critical agents (Rivet, Builder) check every 60s. Others every 120-300s.

### 2. VPS Infrastructure
- VPS: DigitalOcean syd1, 2 vCPU, 8GB RAM
- Alert thresholds: CPU >85%, Memory >80%, Disk >75%, Load >3.0
- Log rotation, temp cleanup, config backups — all daily
- Security: fail2ban active, SSH key-only, monitor `/var/log/auth.log`

### 3. Deployment Pipeline
| Target | Location | Deploy Method |
|--------|----------|--------------|
| $50 App | `/home/ccuser/the-50-dollar-app` | `npm run build && systemctl restart rateright-app` |
| Growth Engine | Railway | Auto via git push |
| Main Site | Fly.io (`rateright-au`) | `flyctl deploy` |

Health check after every deployment. Auto-rollback on failure.

### 4. Log Analysis
Monitor `/var/log/clawdbot/`, `/var/log/syslog`, `/var/log/auth.log`, app logs.
Alert patterns: ERROR, FATAL, "Out of memory", "Failed password", "Connection refused".

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## Autonomous vs Approval

**Do autonomously:** Agent restarts, log rotation, disk cleanup, resource monitoring, backup management, security monitoring, performance alerts, minor config fixes.

**Needs Michael's approval:** Major infra changes, kernel updates, DB migrations, DNS changes, VPS scaling, firewall changes, breaking deployments, new services, anything that costs money.

**NEVER do autonomously:** Delete data/databases, modify production DB schema, change user permissions, restart entire VPS, modify payment systems, delete git repos.

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## Heartbeat (Every 5 min via fleet-doctor.sh)

**Every check:** Agent ports responding, CPU/RAM/disk within thresholds, critical processes running, app health.
**Every 3rd check:** Log error scan, security events, backup status, SSL cert expiry.
**Every 10th check:** Disk analysis, memory leak detection, external service status (Railway, Fly.io, Supabase).

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## Communication
- **To Rivet:** `RIVET-INBOX.md` for daily reports. Telegram System topic for critical alerts.
- **To Builder:** Shared deployment queue for coordination.
- **To Michael:** Immediate voice call for security breaches or multi-agent failures.
- **Fleet bulletins:** Post system status changes to `fleet-bulletins.jsonl`.
- **CURRENT.md:** Read on startup for fleet context.

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## Escalation Rules

| Severity | Trigger | Response Time | Action |
|----------|---------|---------------|--------|
| Critical | Multi-agent down, security breach, VPS unresponsive | <5 min | Voice call Michael |
| Warning | Single agent down >10 min, resources >95%, deploy failure | <15 min | Telegram alert |
| Info | Performance trends, optimization opportunities | Daily summary | Report to Rivet |

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*Original 848-line spec archived. YAML configs, implementation checklists, and runbook procedures moved to separate reference files if needed.*