Fix package.json/lockfile mismatch for better-sqlite3

package.json pinned 9.6.0 but package-lock.json had 13.0.3,
causing npm ci to fail immediately. Updated to ^13.0.3 to match
what is already resolved in the lockfile.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/docker-publish.yml

@@ -0,0 +1,54 @@
+name: Docker Build and Push
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - main
+
+env:
+  REGISTRY: git.necloud.us
+  IMAGE_NAME: nate/skywatch
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Container Registry
+        if: gitea.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha,prefix={{branch}}-
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: ${{ gitea.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -6,8 +6,8 @@ WORKDIR /app/client
 # Copy client package files
 COPY client/package*.json ./
 
-# Install dependencies
+# Install dependencies (--legacy-peer-deps needed for react-scripts 5 + React 19)
-RUN npm ci
+RUN npm ci --legacy-peer-deps
 
 # Copy client source
 COPY client/src ./src
@@ -16,19 +16,21 @@ COPY client/public ./public
 # Build React app
 RUN npm run build
 
-# Final stage - Node.js server
+# Final stage - Node.js server (slim Debian for glibc native module compatibility)
-FROM node:20-alpine
+FROM node:20-slim
 
 WORKDIR /app
 
-# Install dumb-init for proper signal handling
+# Install dumb-init and build tools needed by better-sqlite3
-RUN apk add --no-cache dumb-init
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    dumb-init python3 make g++ \
+    && rm -rf /var/lib/apt/lists/*
 
 # Copy server package files
 COPY package*.json ./
 
 # Install production dependencies only
-RUN npm ci --only=production
+RUN npm ci --omit=dev
 
 # Copy server code
 COPY server ./server
@@ -36,12 +38,11 @@ COPY server ./server
 # Copy built React client from builder stage
 COPY --from=client-builder /app/client/build ./client/build
 
-# Create data directory and set permissions
+# Create non-root user and data directory
-RUN mkdir -p /app/data && chown -R 1001:1001 /app
+RUN groupadd -g 1001 nodejs && \
-
+    useradd -u 1001 -g nodejs nodejs && \
-# Create non-root user
+    mkdir -p /app/data && \
-RUN addgroup -g 1001 -S nodejs && \
+    chown -R nodejs:nodejs /app
-    adduser -S nodejs -u 1001
 
 USER nodejs
 

agent/install-agent-macos.sh

@@ -0,0 +1,130 @@
+#!/bin/bash
+# SkyWatch macOS Agent Installer v1.0.0
+# Installs the agent as a launchd daemon (runs at boot, requires sudo)
+#
+# Usage:
+#   sudo bash install-agent-macos.sh --server-url https://skywatch.example.com
+#
+# Options:
+#   --server-url <url>        SkyWatch server URL (required)
+#   --interval <secs>         Reporting interval in seconds (default: 60)
+#   --name <label>            Agent display name (default: hostname)
+#   --registration-key <key>  Optional registration key
+#   --uninstall               Remove the agent
+
+set -e
+
+PLIST_LABEL="us.necloud.skywatch-agent"
+PLIST_PATH="/Library/LaunchDaemons/${PLIST_LABEL}.plist"
+AGENT_SCRIPT="/usr/local/bin/skywatch-agent-macos.sh"
+CONFIG_FILE="/etc/skywatch-agent-macos.conf"
+LOG_FILE="/var/log/skywatch-agent.log"
+
+SERVER_URL=""
+INTERVAL=60
+AGENT_NAME="$(hostname -f 2>/dev/null || hostname)"
+REGISTRATION_KEY=""
+UNINSTALL=false
+
+# Parse arguments
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        --server-url)        SERVER_URL="$2"; shift 2 ;;
+        --interval)          INTERVAL="$2";   shift 2 ;;
+        --name)              AGENT_NAME="$2"; shift 2 ;;
+        --registration-key)  REGISTRATION_KEY="$2"; shift 2 ;;
+        --uninstall)         UNINSTALL=true;  shift ;;
+        *) echo "Unknown option: $1"; exit 1 ;;
+    esac
+done
+
+step() { echo "==> $*"; }
+ok()   { echo "    OK: $*"; }
+
+# ── Uninstall ──────────────────────────────────────────────────────────────────
+if [ "$UNINSTALL" = true ]; then
+    step "Stopping and removing SkyWatch agent ..."
+    launchctl unload "$PLIST_PATH" 2>/dev/null || true
+    rm -f "$PLIST_PATH" "$AGENT_SCRIPT" "$CONFIG_FILE"
+    ok "SkyWatch agent removed."
+    ok "Log file kept at ${LOG_FILE} — remove manually if desired."
+    exit 0
+fi
+
+# ── Require root ───────────────────────────────────────────────────────────────
+if [ "$(id -u)" -ne 0 ]; then
+    echo "ERROR: This installer must be run as root: sudo bash $0 $*"
+    exit 1
+fi
+
+if [ -z "$SERVER_URL" ]; then
+    echo "ERROR: --server-url is required."
+    echo "Usage: sudo bash install-agent-macos.sh --server-url https://skywatch.example.com"
+    exit 1
+fi
+
+# ── Install ────────────────────────────────────────────────────────────────────
+step "Downloading agent script from ${SERVER_URL} ..."
+curl -fsSL "${SERVER_URL}/api/agents/script-macos" -o "$AGENT_SCRIPT"
+chmod +x "$AGENT_SCRIPT"
+ok "Agent script installed to ${AGENT_SCRIPT}"
+
+step "Writing configuration ..."
+cat > "$CONFIG_FILE" << CONF
+SKYWATCH_URL="${SERVER_URL}"
+AGENT_TOKEN=""
+REPORT_INTERVAL="${INTERVAL}"
+AGENT_NAME="${AGENT_NAME}"
+REGISTRATION_KEY="${REGISTRATION_KEY}"
+CONF
+chmod 600 "$CONFIG_FILE"
+ok "Config written to ${CONFIG_FILE}"
+
+step "Installing launchd daemon ..."
+cat > "$PLIST_PATH" << PLIST
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>Label</key>
+    <string>${PLIST_LABEL}</string>
+    <key>ProgramArguments</key>
+    <array>
+        <string>/bin/bash</string>
+        <string>${AGENT_SCRIPT}</string>
+    </array>
+    <key>EnvironmentVariables</key>
+    <dict>
+        <key>CONFIG_FILE</key>
+        <string>${CONFIG_FILE}</string>
+        <key>LOG_FILE</key>
+        <string>${LOG_FILE}</string>
+    </dict>
+    <key>RunAtLoad</key>
+    <true/>
+    <key>KeepAlive</key>
+    <true/>
+    <key>ThrottleInterval</key>
+    <integer>10</integer>
+    <key>StandardOutPath</key>
+    <string>${LOG_FILE}</string>
+    <key>StandardErrorPath</key>
+    <string>${LOG_FILE}</string>
+</dict>
+</plist>
+PLIST
+chmod 644 "$PLIST_PATH"
+ok "Daemon plist written to ${PLIST_PATH}"
+
+step "Loading daemon ..."
+launchctl unload "$PLIST_PATH" 2>/dev/null || true
+launchctl load -w "$PLIST_PATH"
+
+echo ""
+echo "✅ SkyWatch Agent installed and started!"
+echo "   Logs:      tail -f ${LOG_FILE}"
+echo "   Status:    launchctl list | grep skywatch"
+echo "   Uninstall: sudo bash install-agent-macos.sh --uninstall"
+echo ""
+echo "The agent will register with ${SERVER_URL} and appear in your"
+echo "SkyWatch dashboard within a minute."

agent/install-agent-windows.ps1

@@ -0,0 +1,144 @@
+#Requires -RunAsAdministrator
+#Requires -Version 5.1
+<#
+.SYNOPSIS
+    SkyWatch Windows Agent Installer v1.0.0
+.DESCRIPTION
+    Downloads and installs the SkyWatch agent as a Windows Task Scheduler job
+    that starts at boot and runs as SYSTEM.
+.PARAMETER ServerUrl
+    SkyWatch server URL (required), e.g. https://skywatch.necloud.us
+.PARAMETER AgentName
+    Display name for this agent (default: computer name)
+.PARAMETER Interval
+    Reporting interval in seconds (default: 60)
+.PARAMETER RegistrationKey
+    Optional registration key if server requires one
+.PARAMETER Uninstall
+    Remove the agent and its scheduled task
+.EXAMPLE
+    .\install-agent-windows.ps1 -ServerUrl https://skywatch.necloud.us
+.EXAMPLE
+    .\install-agent-windows.ps1 -Uninstall
+#>
+[CmdletBinding()]
+param(
+    [string]$ServerUrl,
+    [string]$AgentName,
+    [int]   $Interval = 60,
+    [string]$RegistrationKey,
+    [switch]$Uninstall
+)
+
+$TaskName   = "SkyWatch Agent"
+$InstallDir = "C:\ProgramData\SkyWatch"
+$AgentScript = "$InstallDir\skywatch-agent-windows.ps1"
+$ConfigFile  = "$InstallDir\agent.conf"
+
+function Write-Step { param([string]$Msg) Write-Host "==> $Msg" -ForegroundColor Cyan }
+function Write-OK   { param([string]$Msg) Write-Host "    $Msg"  -ForegroundColor Green }
+function Write-Err  { param([string]$Msg) Write-Host "    ERROR: $Msg" -ForegroundColor Red; exit 1 }
+
+# ── Uninstall ──────────────────────────────────────────────────────────────────
+if ($Uninstall) {
+    Write-Step "Removing SkyWatch Agent ..."
+    Stop-ScheduledTask   -TaskName $TaskName -ErrorAction SilentlyContinue
+    Unregister-ScheduledTask -TaskName $TaskName -Confirm:$false -ErrorAction SilentlyContinue
+    if (Test-Path $InstallDir) { Remove-Item $InstallDir -Recurse -Force }
+    Write-OK "SkyWatch Agent removed."
+    exit 0
+}
+
+# ── Validate ───────────────────────────────────────────────────────────────────
+if (-not $ServerUrl) {
+    Write-Err "ServerUrl is required.`nExample: .\install-agent-windows.ps1 -ServerUrl https://skywatch.necloud.us"
+}
+
+# ── Install ────────────────────────────────────────────────────────────────────
+Write-Step "Creating install directory ..."
+if (-not (Test-Path $InstallDir)) {
+    New-Item -ItemType Directory -Path $InstallDir -Force | Out-Null
+}
+Write-OK $InstallDir
+
+Write-Step "Downloading agent script from $ServerUrl ..."
+try {
+    [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12
+    Invoke-WebRequest -Uri "$ServerUrl/api/agents/script-windows" `
+                      -OutFile $AgentScript -UseBasicParsing -TimeoutSec 30
+    Write-OK "Saved to $AgentScript"
+} catch {
+    Write-Err "Download failed: $_"
+}
+
+Write-Step "Writing configuration ..."
+$name = if ($AgentName) { $AgentName } else { $env:COMPUTERNAME }
+@"
+SKYWATCH_URL="$ServerUrl"
+AGENT_TOKEN=""
+REPORT_INTERVAL=$Interval
+AGENT_NAME="$name"
+REGISTRATION_KEY="$RegistrationKey"
+"@ | Set-Content $ConfigFile -Encoding UTF8
+Write-OK "Config saved to $ConfigFile"
+
+# Allow scripts to run (per-machine, won't affect user policy)
+Write-Step "Setting PowerShell execution policy ..."
+try {
+    Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope LocalMachine -Force -ErrorAction Stop
+    Write-OK "RemoteSigned (LocalMachine)"
+} catch {
+    Write-Host "    (Could not set policy — you may need to run: Set-ExecutionPolicy RemoteSigned)" -ForegroundColor Yellow
+}
+
+Write-Step "Registering scheduled task ..."
+# Remove any previous install
+Unregister-ScheduledTask -TaskName $TaskName -Confirm:$false -ErrorAction SilentlyContinue
+
+$psArgs = "-NonInteractive -WindowStyle Hidden -ExecutionPolicy Bypass -File `"$AgentScript`" -ConfigFile `"$ConfigFile`""
+
+$action = New-ScheduledTaskAction -Execute "powershell.exe" -Argument $psArgs
+
+$triggers = @(
+    (New-ScheduledTaskTrigger -AtStartup),
+    (New-ScheduledTaskTrigger -Once -At (Get-Date).AddSeconds(10) `
+        -RepetitionInterval (New-TimeSpan -Minutes 5))   # restart every 5 min if it exits
+)
+
+$settings = New-ScheduledTaskSettingsSet `
+    -ExecutionTimeLimit  (New-TimeSpan -Hours 0) `
+    -RestartCount        5 `
+    -RestartInterval     (New-TimeSpan -Minutes 1) `
+    -MultipleInstances   IgnoreNew `
+    -StartWhenAvailable
+
+$principal = New-ScheduledTaskPrincipal `
+    -UserId    "SYSTEM" `
+    -LogonType ServiceAccount `
+    -RunLevel  Highest
+
+Register-ScheduledTask `
+    -TaskName  $TaskName `
+    -Action    $action `
+    -Trigger   $triggers `
+    -Settings  $settings `
+    -Principal $principal `
+    -Force | Out-Null
+
+Write-OK "Task '$TaskName' created"
+
+Write-Step "Starting agent ..."
+Start-ScheduledTask -TaskName $TaskName
+Start-Sleep -Seconds 3
+
+$state = (Get-ScheduledTask -TaskName $TaskName).State
+Write-OK "Task state: $state"
+
+Write-Host ""
+Write-Host "✅ SkyWatch Agent installed!" -ForegroundColor Green
+Write-Host "   Logs:      Get-Content '$InstallDir\agent.log' -Wait"
+Write-Host "   Status:    Get-ScheduledTask -TaskName '$TaskName'"
+Write-Host "   Uninstall: .\install-agent-windows.ps1 -Uninstall"
+Write-Host ""
+Write-Host "The agent will register with $ServerUrl and appear in your"
+Write-Host "SkyWatch dashboard within a minute."

agent/install-agent.sh

@@ -0,0 +1,195 @@
+#!/bin/bash
+# SkyWatch Linux Agent Installer
+# Installs the agent as a systemd service on Ubuntu/Debian/RHEL/CentOS/Fedora
+#
+# Usage:
+#   sudo bash install-agent.sh --server-url http://<host>:3001 [options]
+#
+# Options:
+#   --server-url <URL>     SkyWatch server URL (required)
+#   --interval <seconds>   Metrics report interval (default: 60)
+#   --name <name>          Agent display name (default: hostname)
+#   --uninstall            Remove the agent and all its files
+
+set -e
+
+AGENT_DIR="/opt/skywatch-agent"
+CONFIG_FILE="/etc/skywatch-agent.conf"
+SERVICE_FILE="/etc/systemd/system/skywatch-agent.service"
+SCRIPT_NAME="skywatch-agent.sh"
+SERVICE_NAME="skywatch-agent"
+
+# ── Colours ──────────────────────────────────────────────────────────────────
+RED='\033[0;31m'; GREEN='\033[0;32m'; YELLOW='\033[1;33m'
+BLUE='\033[0;34m'; NC='\033[0m'
+
+info()    { echo -e "${BLUE}[INFO]${NC}  $*"; }
+ok()      { echo -e "${GREEN}[OK]${NC}    $*"; }
+warn()    { echo -e "${YELLOW}[WARN]${NC}  $*"; }
+error()   { echo -e "${RED}[ERROR]${NC} $*" >&2; }
+die()     { error "$*"; exit 1; }
+
+usage() {
+    cat << EOF
+Usage: sudo bash install-agent.sh --server-url <URL> [options]
+
+Options:
+  --server-url <URL>        SkyWatch server URL  (required)
+  --interval <secs>         How often to report metrics in seconds (default: 60)
+  --name <name>             Agent name shown in dashboard (default: hostname)
+  --registration-key <key>  Secret key required by the server to allow registration
+  --uninstall               Stop, disable, and remove the agent
+
+Examples:
+  sudo bash install-agent.sh --server-url https://skywatch.necloud.us
+  sudo bash install-agent.sh --server-url https://skywatch.necloud.us --interval 30 --name web-01
+  sudo bash install-agent.sh --server-url https://skywatch.necloud.us --registration-key mySecret
+  sudo bash install-agent.sh --uninstall
+EOF
+    exit 1
+}
+
+# ── Argument parsing ──────────────────────────────────────────────────────────
+SKYWATCH_URL=""
+INTERVAL=60
+AGENT_NAME=""
+REGISTRATION_KEY=""
+UNINSTALL=false
+
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        --server-url)        SKYWATCH_URL="${2:?'--server-url requires a value'}"; shift 2 ;;
+        --interval)          INTERVAL="${2:?'--interval requires a value'}"; shift 2 ;;
+        --name)              AGENT_NAME="${2:?'--name requires a value'}"; shift 2 ;;
+        --registration-key)  REGISTRATION_KEY="${2:?'--registration-key requires a value'}"; shift 2 ;;
+        --uninstall)         UNINSTALL=true; shift ;;
+        -h|--help)           usage ;;
+        *)                   error "Unknown option: $1"; usage ;;
+    esac
+done
+
+# ── Root check ────────────────────────────────────────────────────────────────
+if [ "$(id -u)" -ne 0 ]; then
+    die "This installer must be run as root. Try: sudo bash $0 $*"
+fi
+
+# ── Uninstall path ────────────────────────────────────────────────────────────
+if [ "$UNINSTALL" = true ]; then
+    info "Uninstalling SkyWatch Agent..."
+    systemctl stop "$SERVICE_NAME"  2>/dev/null || true
+    systemctl disable "$SERVICE_NAME" 2>/dev/null || true
+    rm -f "$SERVICE_FILE"
+    systemctl daemon-reload 2>/dev/null || true
+    rm -rf "$AGENT_DIR"
+    rm -f "$CONFIG_FILE"
+    rm -f /var/log/skywatch-agent.log
+    ok "SkyWatch Agent removed."
+    exit 0
+fi
+
+# ── Validate required args ────────────────────────────────────────────────────
+[ -z "$SKYWATCH_URL" ] && usage
+
+echo ""
+echo "╔══════════════════════════════════════════╗"
+echo "║      SkyWatch Linux Agent Installer      ║"
+echo "╚══════════════════════════════════════════╝"
+echo ""
+info "Server URL : $SKYWATCH_URL"
+info "Interval   : ${INTERVAL}s"
+info "Agent name : ${AGENT_NAME:-$(hostname -f 2>/dev/null || hostname)}"
+[ -n "$REGISTRATION_KEY" ] && info "Reg. key   : (set)"
+echo ""
+
+# ── Dependency check ──────────────────────────────────────────────────────────
+for cmd in curl awk df; do
+    command -v "$cmd" &>/dev/null || die "Required command '$cmd' not found. Install it and retry."
+done
+
+if ! command -v systemctl &>/dev/null; then
+    die "systemd not found. This installer requires a systemd-based Linux distro (Ubuntu 16.04+, Debian 9+, RHEL/CentOS 7+)."
+fi
+
+# ── Locate the agent script ───────────────────────────────────────────────────
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+SCRIPT_SRC="$SCRIPT_DIR/$SCRIPT_NAME"
+
+mkdir -p "$AGENT_DIR"
+
+if [ -f "$SCRIPT_SRC" ]; then
+    cp "$SCRIPT_SRC" "$AGENT_DIR/$SCRIPT_NAME"
+    ok "Agent script copied from $SCRIPT_SRC"
+else
+    info "Downloading agent script from server..."
+    if ! curl -fsSL "${SKYWATCH_URL}/api/agents/script" -o "$AGENT_DIR/$SCRIPT_NAME"; then
+        die "Could not find $SCRIPT_NAME locally or download it from the server.\nPlace install-agent.sh and skywatch-agent.sh in the same directory."
+    fi
+    ok "Agent script downloaded."
+fi
+
+chmod +x "$AGENT_DIR/$SCRIPT_NAME"
+
+# ── Write config ──────────────────────────────────────────────────────────────
+cat > "$CONFIG_FILE" << CONF
+# SkyWatch Agent configuration
+SKYWATCH_URL="${SKYWATCH_URL}"
+AGENT_TOKEN=""
+REPORT_INTERVAL="${INTERVAL}"
+AGENT_NAME="${AGENT_NAME:-$(hostname -f 2>/dev/null || hostname)}"
+REGISTRATION_KEY="${REGISTRATION_KEY}"
+CONF
+chmod 600 "$CONFIG_FILE"
+ok "Config written to $CONFIG_FILE"
+
+# ── Create systemd unit ───────────────────────────────────────────────────────
+cat > "$SERVICE_FILE" << UNIT
+[Unit]
+Description=SkyWatch System Metrics Agent
+Documentation=https://github.com/nmemmert/monitor
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+ExecStart=/bin/bash ${AGENT_DIR}/${SCRIPT_NAME}
+Restart=always
+RestartSec=30
+Environment=CONFIG_FILE=${CONFIG_FILE}
+Environment=LOG_FILE=/var/log/skywatch-agent.log
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=skywatch-agent
+
+[Install]
+WantedBy=multi-user.target
+UNIT
+
+ok "Systemd unit written to $SERVICE_FILE"
+
+# ── Enable and start ──────────────────────────────────────────────────────────
+systemctl daemon-reload
+systemctl enable "$SERVICE_NAME"
+systemctl restart "$SERVICE_NAME"
+
+sleep 2   # give it a moment to register
+
+echo ""
+echo "╔══════════════════════════════════════════╗"
+echo "║         Agent installed and running!     ║"
+echo "╚══════════════════════════════════════════╝"
+echo ""
+ok "Service: $SERVICE_NAME"
+ok "Config:  $CONFIG_FILE"
+ok "Logs:    /var/log/skywatch-agent.log"
+echo ""
+echo "Useful commands:"
+echo "  sudo systemctl status $SERVICE_NAME"
+echo "  sudo journalctl -u $SERVICE_NAME -f"
+echo "  sudo systemctl stop $SERVICE_NAME"
+echo "  sudo bash $0 --uninstall"
+echo ""
+echo "The agent will appear in your SkyWatch dashboard under the Agents section."
+echo ""
+
+# ── Show live status ──────────────────────────────────────────────────────────
+systemctl --no-pager status "$SERVICE_NAME" || true

agent/skywatch-agent-macos.sh

@@ -0,0 +1,333 @@
+#!/bin/bash
+# SkyWatch macOS Agent v1.0.0
+# Collects system metrics and sends to SkyWatch monitoring server
+#
+# Requirements: macOS 10.15+, bash 3.2+, curl
+# Run via launchd (see install-agent-macos.sh) or: bash skywatch-agent-macos.sh
+
+VERSION="1.0.0"
+CONFIG_FILE="${CONFIG_FILE:-/etc/skywatch-agent-macos.conf}"
+LOG_FILE="${LOG_FILE:-/var/log/skywatch-agent.log}"
+
+# Fall back to home dir if system paths aren't writable
+if [ ! -w "$(dirname "$CONFIG_FILE")" ] 2>/dev/null; then
+    CONFIG_FILE="$HOME/.skywatch-agent-macos.conf"
+    LOG_FILE="$HOME/.skywatch-agent.log"
+fi
+
+log() {
+    local ts
+    ts=$(date '+%Y-%m-%d %H:%M:%S' 2>/dev/null || echo "")
+    local msg="[$ts] $*"
+    echo "$msg" >> "$LOG_FILE" 2>/dev/null || true
+    echo "$msg"
+}
+
+load_config() {
+    if [ -f "$CONFIG_FILE" ]; then
+        # shellcheck disable=SC1090
+        source "$CONFIG_FILE"
+    fi
+}
+
+save_config() {
+    cat > "$CONFIG_FILE" << CONF
+SKYWATCH_URL="${SKYWATCH_URL:-}"
+AGENT_TOKEN="${AGENT_TOKEN:-}"
+REPORT_INTERVAL="${REPORT_INTERVAL:-60}"
+AGENT_NAME="${AGENT_NAME:-}"
+REGISTRATION_KEY="${REGISTRATION_KEY:-}"
+CONF
+    chmod 600 "$CONFIG_FILE" 2>/dev/null || true
+}
+
+# CPU usage % — two samples from top, 1 second apart
+get_cpu_percent() {
+    local line idle
+    line=$(top -l 2 -n 0 2>/dev/null | grep "^CPU usage:" | tail -1)
+    # "CPU usage: 8.46% user, 11.45% sys, 80.08% idle"
+    idle=$(echo "$line" | awk '{
+        for (i = 1; i <= NF; i++) {
+            if ($i ~ /idle/) {
+                v = $(i - 1); gsub(/%/, "", v); print v; exit
+            }
+        }
+    }')
+    [ -z "$idle" ] && idle=0
+    awk -v i="$idle" 'BEGIN { printf "%.1f", 100 - i }'
+}
+
+# Memory stats in MB — uses vm_stat + sysctl
+get_memory() {
+    local total_bytes vm_out page_size pages_free pages_inactive pages_spec
+
+    total_bytes=$(sysctl -n hw.memsize 2>/dev/null || echo 0)
+    vm_out=$(vm_stat 2>/dev/null)
+
+    # Page size from vm_stat header (4096 on Intel, 16384 on Apple Silicon)
+    page_size=$(echo "$vm_out" | awk '/page size of/ {
+        for (i = 1; i <= NF; i++) if ($i ~ /^[0-9]+$/ && $(i+1) == "bytes") { print $i; exit }
+    }')
+    [ -z "$page_size" ] && page_size=$(sysctl -n hw.pagesize 2>/dev/null || echo 4096)
+
+    pages_free=$(echo     "$vm_out" | awk '/^Pages free:/        { gsub(/\./, "", $NF); print $NF+0 }')
+    pages_inactive=$(echo "$vm_out" | awk '/^Pages inactive:/    { gsub(/\./, "", $NF); print $NF+0 }')
+    pages_spec=$(echo     "$vm_out" | awk '/^Pages speculative:/ { gsub(/\./, "", $NF); print $NF+0 }')
+
+    awk -v total="$total_bytes" -v page="$page_size" \
+        -v free="${pages_free:-0}" -v inact="${pages_inactive:-0}" -v spec="${pages_spec:-0}" \
+    'BEGIN {
+        total_mb = int(total / 1048576)
+        avail_mb = int((free + inact + spec) * page / 1048576)
+        used_mb  = total_mb - avail_mb
+        if (used_mb < 0) used_mb = 0
+        pct = (total_mb > 0) ? used_mb * 100.0 / total_mb : 0
+        printf "%d %d %.1f", total_mb, used_mb, pct
+    }'
+}
+
+# Disk info as JSON — real mounted volumes, skips macOS internal system volumes
+get_disk_json() {
+    df -P -k 2>/dev/null | tail -n +2 | awk '
+        $6 ~ /^\/System\/Volumes\// { next }
+        $6 ~ /^\/private\/var\/vm/  { next }
+        NF >= 6 {
+            pct = $5; sub(/%/, "", pct)
+            mp = $6
+            gsub(/\\/, "\\\\", mp); gsub(/"/, "\\\"", mp)
+            if (c > 0) printf ","
+            printf "{\"path\":\"%s\",\"total_mb\":%d,\"used_mb\":%d,\"percent\":%d}",
+                mp, int($2/1024), int($3/1024), int(pct)
+            c++
+        }
+        BEGIN { printf "[" }
+        END   { printf "]" }
+    '
+}
+
+# Cumulative network bytes — hardware-level rows from netstat -ib, no loopback
+get_net_bytes() {
+    netstat -ib 2>/dev/null | awk '
+        /Name/ { next }
+        /<Link#/ && !/^lo/ { recv += $7; sent += $10 }
+        END { printf "%d %d", sent, recv }
+    ' || echo "0 0"
+}
+
+# 1/5/15-min load averages from sysctl
+get_load() {
+    sysctl -n vm.loadavg 2>/dev/null \
+        | awk '{ printf "%s %s %s", $2, $3, $4 }' \
+        || echo "0.00 0.00 0.00"
+}
+
+# System uptime in seconds from boot time
+get_uptime_seconds() {
+    local boot_sec now_sec
+    # kern.boottime: { sec = NNNN, usec = N }
+    boot_sec=$(sysctl -n kern.boottime 2>/dev/null \
+        | awk '{ for (i=1;i<=NF;i++) if ($i=="sec") { v=$(i+2); gsub(/[^0-9]/,"",v); print v; exit } }')
+    now_sec=$(date +%s)
+    if [ -n "$boot_sec" ] && [ "$boot_sec" -gt 0 ] 2>/dev/null; then
+        echo $((now_sec - boot_sec))
+    else
+        echo 0
+    fi
+}
+
+# Running process count
+get_process_count() {
+    ps -ax 2>/dev/null | tail -n +2 | wc -l | tr -d ' \n'
+}
+
+# Primary non-loopback IPv4
+get_ip_address() {
+    local iface
+    iface=$(route -n get default 2>/dev/null | awk '/interface:/ { print $2 }')
+    if [ -n "$iface" ]; then
+        ipconfig getifaddr "$iface" 2>/dev/null \
+            || ifconfig "$iface" 2>/dev/null | awk '/inet / { print $2; exit }'
+    fi
+}
+
+# macOS version string
+get_os_info() {
+    local name ver
+    name=$(sw_vers -productName    2>/dev/null || echo "macOS")
+    ver=$(sw_vers  -productVersion 2>/dev/null || echo "")
+    echo "${name} ${ver}"
+}
+
+# Register with server; saves token to config on success
+register_agent() {
+    local name="${AGENT_NAME:-$(hostname -f 2>/dev/null || hostname)}"
+    local hostname_val
+    hostname_val=$(hostname -f 2>/dev/null || hostname)
+    local ip
+    ip=$(get_ip_address || echo "")
+    local os
+    os=$(get_os_info)
+
+    local esc_name esc_host esc_os
+    esc_name="${name//\"/\\\"}"
+    esc_host="${hostname_val//\"/\\\"}"
+    esc_os="${os//\"/\\\"}"
+
+    log "Registering agent '${name}' with ${SKYWATCH_URL} ..."
+
+    local -a curl_args
+    curl_args=(-sf -m 30 -X POST -H 'Content-Type: application/json')
+    [ -n "${REGISTRATION_KEY:-}" ] && curl_args+=(-H "X-Registration-Key: ${REGISTRATION_KEY}")
+    curl_args+=(-d "{\"name\":\"${esc_name}\",\"hostname\":\"${esc_host}\",\"ip_address\":\"${ip}\",\"os_info\":\"${esc_os}\"}")
+    curl_args+=("${SKYWATCH_URL}/api/agents/register")
+
+    local response
+    response=$(curl "${curl_args[@]}" 2>&1) || {
+        log "ERROR: Could not reach ${SKYWATCH_URL}"
+        return 1
+    }
+
+    local token
+    token=$(echo "$response" | grep -o '"token":"[^"]*"' | sed 's/"token":"//; s/"$//')
+    if [ -z "$token" ]; then
+        log "ERROR: Registration failed. Server said: ${response}"
+        return 1
+    fi
+
+    AGENT_TOKEN="$token"
+    save_config
+    log "Registered. Token stored in ${CONFIG_FILE}"
+}
+
+# Collect and POST metrics
+report_metrics() {
+    local cpu
+    cpu=$(get_cpu_percent)   # includes ~1s sleep inside top
+
+    local mem_total mem_used mem_percent
+    read -r mem_total mem_used mem_percent <<< "$(get_memory)"
+
+    local disk
+    disk=$(get_disk_json)
+
+    local net_sent net_recv
+    read -r net_sent net_recv <<< "$(get_net_bytes)"
+
+    local load1 load5 load15
+    read -r load1 load5 load15 <<< "$(get_load)"
+
+    local uptime_secs
+    uptime_secs=$(get_uptime_seconds)
+
+    local procs
+    procs=$(get_process_count)
+
+    local ip
+    ip=$(get_ip_address || echo "")
+
+    cpu="${cpu:-0.0}"; mem_total="${mem_total:-0}"; mem_used="${mem_used:-0}"
+    mem_percent="${mem_percent:-0.0}"; disk="${disk:-[]}"; net_sent="${net_sent:-0}"
+    net_recv="${net_recv:-0}"; load1="${load1:-0.00}"; load5="${load5:-0.00}"
+    load15="${load15:-0.00}"; uptime_secs="${uptime_secs:-0}"; procs="${procs:-0}"
+
+    local payload
+    payload=$(printf \
+        '{"cpu_percent":%s,"mem_total":%d,"mem_used":%d,"mem_percent":%s,"disk":%s,"load_1":%s,"load_5":%s,"load_15":%s,"uptime_seconds":%d,"process_count":%d,"net_bytes_sent":%s,"net_bytes_recv":%s,"ip_address":"%s"}' \
+        "$cpu" "$mem_total" "$mem_used" "$mem_percent" \
+        "$disk" "$load1" "$load5" "$load15" \
+        "$uptime_secs" "$procs" "$net_sent" "$net_recv" "${ip}")
+
+    local response
+    response=$(curl -sf -m 15 \
+        -X POST \
+        -H 'Content-Type: application/json' \
+        -H "Authorization: Bearer ${AGENT_TOKEN}" \
+        -d "$payload" \
+        "${SKYWATCH_URL}/api/agents/report" 2>&1) || {
+        log "WARNING: Failed to send metrics (network error)"
+        return 0
+    }
+
+    if echo "$response" | grep -q '"ok":true'; then
+        log "OK  cpu=${cpu}%  mem=${mem_used}/${mem_total}MB  load=${load1}"
+    else
+        log "WARNING: Server rejected metrics: ${response}"
+    fi
+}
+
+poll_commands() {
+    local resp http_code
+    resp=$(curl -sf -m 10 \
+        -H "Authorization: Bearer ${AGENT_TOKEN}" \
+        -w '\n__HTTP_CODE__%{http_code}' \
+        "${SKYWATCH_URL}/api/agents/commands/pending" 2>/dev/null) || return 0
+
+    http_code=$(echo "$resp" | grep -o '__HTTP_CODE__[0-9]*' | tail -1 | grep -o '[0-9]*')
+    resp=$(echo "$resp" | sed '/__HTTP_CODE__/d')
+
+    [ "$http_code" = "204" ] && return 0
+    [ "$http_code" != "200" ] && return 0
+
+    local cmd_id cmd_str
+    cmd_id=$(echo "$resp" | grep -o '"id":[0-9]*' | head -1 | grep -o '[0-9]*')
+    cmd_str=$(echo "$resp" | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('command',''))" 2>/dev/null \
+        || echo "$resp" | sed -n 's/.*"command":"\([^"]*\)".*/\1/p')
+
+    [ -z "$cmd_id" ] || [ -z "$cmd_str" ] && return 0
+
+    log "Running command #${cmd_id}: ${cmd_str}"
+
+    local tmp_out exit_code
+    tmp_out=$(mktemp)
+    gtimeout 60 bash -c "$cmd_str" > "$tmp_out" 2>&1 || timeout 60 bash -c "$cmd_str" > "$tmp_out" 2>&1
+    exit_code=$?
+
+    local tmp_json
+    tmp_json=$(mktemp)
+    python3 - "$tmp_out" "$exit_code" > "$tmp_json" 2>/dev/null << 'PYEOF'
+import sys, json
+with open(sys.argv[1]) as f:
+    output = f.read(131072)
+print(json.dumps({"output": output, "exit_code": int(sys.argv[2])}))
+PYEOF
+
+    curl -sf -m 15 -X POST \
+        -H "Authorization: Bearer ${AGENT_TOKEN}" \
+        -H "Content-Type: application/json" \
+        -d "@${tmp_json}" \
+        "${SKYWATCH_URL}/api/agents/commands/${cmd_id}/result" >/dev/null 2>&1 || true
+
+    rm -f "$tmp_out" "$tmp_json"
+}
+
+main() {
+    load_config
+
+    if [ -z "${SKYWATCH_URL:-}" ]; then
+        echo "ERROR: SKYWATCH_URL is not set."
+        echo "Create ${CONFIG_FILE} or use the installer:"
+        echo "  sudo bash install-agent-macos.sh --server-url https://<your-server>"
+        exit 1
+    fi
+
+    if [ -z "${AGENT_TOKEN:-}" ]; then
+        if ! register_agent; then
+            log "Retrying registration in 60 s..."
+            sleep 60
+            register_agent || exit 1
+        fi
+    fi
+
+    local interval="${REPORT_INTERVAL:-60}"
+    log "SkyWatch Agent v${VERSION} started (macOS) — server=${SKYWATCH_URL}  interval=${interval}s"
+
+    while true; do
+        report_metrics
+        poll_commands
+        local sleep_time=$(( interval - 1 ))
+        [ "$sleep_time" -lt 1 ] && sleep_time=1
+        sleep "$sleep_time"
+    done
+}
+
+main "$@"

agent/skywatch-agent-windows.ps1

@@ -0,0 +1,313 @@
+#Requires -Version 5.1
+<#
+.SYNOPSIS
+    SkyWatch Windows Agent v1.0.0
+.DESCRIPTION
+    Collects system metrics and sends to SkyWatch monitoring server.
+    Metrics: CPU%, Memory, Disk, Network I/O, Process count, Uptime, OS info.
+    Run via Task Scheduler (installed by install-agent-windows.ps1).
+.PARAMETER ConfigFile
+    Path to the configuration file (default: C:\ProgramData\SkyWatch\agent.conf)
+#>
+param(
+    [string]$ConfigFile = "C:\ProgramData\SkyWatch\agent.conf"
+)
+
+$VERSION   = "1.0.0"
+$LogFile   = "C:\ProgramData\SkyWatch\agent.log"
+$InstallDir = Split-Path $ConfigFile
+
+# ── Logging ───────────────────────────────────────────────────────────────────
+
+function Write-Log {
+    param([string]$Message)
+    $ts   = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
+    $line = "[$ts] $Message"
+    Write-Host $line
+    try { Add-Content -Path $LogFile -Value $line -ErrorAction Stop } catch {}
+}
+
+# ── Config ────────────────────────────────────────────────────────────────────
+
+function Load-Config {
+    $script:SKYWATCH_URL      = ""
+    $script:AGENT_TOKEN       = ""
+    $script:REPORT_INTERVAL   = 60
+    $script:AGENT_NAME        = ""
+    $script:REGISTRATION_KEY  = ""
+
+    if (Test-Path $ConfigFile) {
+        Get-Content $ConfigFile | ForEach-Object {
+            if ($_ -match '^([A-Z_]+)="?(.*?)"?\s*$') {
+                $key = $matches[1]; $val = $matches[2]
+                switch ($key) {
+                    "SKYWATCH_URL"     { $script:SKYWATCH_URL    = $val }
+                    "AGENT_TOKEN"      { $script:AGENT_TOKEN     = $val }
+                    "REPORT_INTERVAL"  { $script:REPORT_INTERVAL = [int]$val }
+                    "AGENT_NAME"       { $script:AGENT_NAME      = $val }
+                    "REGISTRATION_KEY" { $script:REGISTRATION_KEY = $val }
+                }
+            }
+        }
+    }
+}
+
+function Save-Config {
+    if (-not (Test-Path $InstallDir)) {
+        New-Item -ItemType Directory -Path $InstallDir -Force | Out-Null
+    }
+    @"
+SKYWATCH_URL="$script:SKYWATCH_URL"
+AGENT_TOKEN="$script:AGENT_TOKEN"
+REPORT_INTERVAL=$script:REPORT_INTERVAL
+AGENT_NAME="$script:AGENT_NAME"
+REGISTRATION_KEY="$script:REGISTRATION_KEY"
+"@ | Set-Content $ConfigFile -Encoding UTF8
+}
+
+# ── Metrics ───────────────────────────────────────────────────────────────────
+
+function Get-CpuPercent {
+    try {
+        # Two raw counter samples 1 second apart for accurate delta
+        $s1 = Get-CimInstance -ClassName Win32_PerfRawData_PerfOS_Processor -Filter "Name='_Total'"
+        Start-Sleep -Seconds 1
+        $s2 = Get-CimInstance -ClassName Win32_PerfRawData_PerfOS_Processor -Filter "Name='_Total'"
+
+        $idleDelta  = $s2.PercentIdleTime  - $s1.PercentIdleTime
+        $totalDelta = $s2.Timestamp_Sys100NS - $s1.Timestamp_Sys100NS
+
+        if ($totalDelta -gt 0) {
+            $idlePct = ($idleDelta / $totalDelta) * 100
+            return [Math]::Round(100 - $idlePct, 1)
+        }
+    } catch {}
+
+    # Fallback: WMI LoadPercentage (less accurate but always available)
+    try {
+        $avg = (Get-WmiObject Win32_Processor | Measure-Object -Property LoadPercentage -Average).Average
+        return [Math]::Round($avg, 1)
+    } catch { return 0.0 }
+}
+
+function Get-MemoryStats {
+    try {
+        $os      = Get-CimInstance Win32_OperatingSystem
+        $totalMB = [long][Math]::Round($os.TotalVisibleMemorySize / 1024)
+        $freeMB  = [long][Math]::Round($os.FreePhysicalMemory / 1024)
+        $usedMB  = $totalMB - $freeMB
+        $pct     = if ($totalMB -gt 0) { [Math]::Round($usedMB * 100.0 / $totalMB, 1) } else { 0.0 }
+        return @{ total = $totalMB; used = $usedMB; percent = $pct }
+    } catch {
+        return @{ total = 0; used = 0; percent = 0.0 }
+    }
+}
+
+function Get-DiskStats {
+    $disks = [System.Collections.Generic.List[hashtable]]::new()
+    try {
+        Get-PSDrive -PSProvider FileSystem | Where-Object { $_.Root -match '^[A-Za-z]:\\' } | ForEach-Object {
+            $total  = $_.Used + $_.Free
+            $totalMB = [long][Math]::Round($total / 1MB)
+            $usedMB  = [long][Math]::Round($_.Used / 1MB)
+            $pct     = if ($total -gt 0) { [int][Math]::Round($_.Used * 100.0 / $total) } else { 0 }
+            $disks.Add(@{ path = $_.Root; total_mb = $totalMB; used_mb = $usedMB; percent = $pct })
+        }
+    } catch {}
+    return $disks
+}
+
+function Get-NetBytes {
+    try {
+        $up = Get-NetAdapter | Where-Object { $_.Status -eq 'Up' } | Select-Object -ExpandProperty Name
+        if ($up) {
+            $stats = Get-NetAdapterStatistics -Name $up -ErrorAction SilentlyContinue
+            $sent  = ($stats | Measure-Object -Property SentBytes     -Sum).Sum
+            $recv  = ($stats | Measure-Object -Property ReceivedBytes -Sum).Sum
+            return @{ sent = [long]$sent; recv = [long]$recv }
+        }
+    } catch {}
+    return @{ sent = 0L; recv = 0L }
+}
+
+function Get-UptimeSeconds {
+    try {
+        $boot = (Get-CimInstance Win32_OperatingSystem).LastBootUpTime
+        return [long](New-TimeSpan -Start $boot -End (Get-Date)).TotalSeconds
+    } catch { return 0L }
+}
+
+function Get-OsInfo {
+    try { return (Get-CimInstance Win32_OperatingSystem).Caption.Trim() }
+    catch { return "Windows" }
+}
+
+function Get-PrimaryIP {
+    try {
+        $route = Get-NetRoute -DestinationPrefix '0.0.0.0/0' -ErrorAction SilentlyContinue |
+                 Sort-Object RouteMetric | Select-Object -First 1
+        if ($route) {
+            $ip = Get-NetIPAddress -InterfaceIndex $route.ifIndex -AddressFamily IPv4 -ErrorAction SilentlyContinue |
+                  Where-Object { $_.IPAddress -notmatch '^169\.254\.' } |
+                  Select-Object -First 1 -ExpandProperty IPAddress
+            return "$ip"
+        }
+    } catch {}
+    return ""
+}
+
+# ── Registration ──────────────────────────────────────────────────────────────
+
+function Register-Agent {
+    $name     = if ($script:AGENT_NAME) { $script:AGENT_NAME } else { $env:COMPUTERNAME }
+    $hostname = $env:COMPUTERNAME
+    $ip       = Get-PrimaryIP
+    $os       = Get-OsInfo
+
+    Write-Log "Registering agent '$name' with $script:SKYWATCH_URL ..."
+
+    $body    = @{ name = $name; hostname = $hostname; ip_address = $ip; os_info = $os } | ConvertTo-Json
+    $headers = @{ 'Content-Type' = 'application/json' }
+    if ($script:REGISTRATION_KEY) { $headers['X-Registration-Key'] = $script:REGISTRATION_KEY }
+
+    try {
+        $resp = Invoke-RestMethod -Uri "$script:SKYWATCH_URL/api/agents/register" `
+                                  -Method POST -Body $body -Headers $headers -TimeoutSec 30
+        if ($resp.token) {
+            $script:AGENT_TOKEN = $resp.token
+            Save-Config
+            Write-Log "Registered. Token stored in $ConfigFile"
+            return $true
+        }
+    } catch { Write-Log "ERROR: Registration failed: $_" }
+    return $false
+}
+
+# ── Metrics report ────────────────────────────────────────────────────────────
+
+function Send-Metrics {
+    $cpu    = Get-CpuPercent         # includes 1s sleep
+    $mem    = Get-MemoryStats
+    $disks  = Get-DiskStats
+    $net    = Get-NetBytes
+    $uptime = Get-UptimeSeconds
+    $procs  = try { (Get-Process -ErrorAction SilentlyContinue).Count } catch { 0 }
+    $ip     = Get-PrimaryIP
+
+    $payload = [ordered]@{
+        cpu_percent    = $cpu
+        mem_total      = $mem.total
+        mem_used       = $mem.used
+        mem_percent    = $mem.percent
+        disk           = @($disks)
+        load_1         = 0.0
+        load_5         = 0.0
+        load_15        = 0.0
+        uptime_seconds = $uptime
+        process_count  = $procs
+        net_bytes_sent = $net.sent
+        net_bytes_recv = $net.recv
+        ip_address     = $ip
+    } | ConvertTo-Json -Depth 3
+
+    try {
+        $resp = Invoke-RestMethod `
+            -Uri     "$script:SKYWATCH_URL/api/agents/report" `
+            -Method  POST `
+            -Body    $payload `
+            -Headers @{ 'Content-Type' = 'application/json'; 'Authorization' = "Bearer $script:AGENT_TOKEN" } `
+            -TimeoutSec 15
+
+        if ($resp.ok) {
+            Write-Log "OK  cpu=$($cpu)%  mem=$($mem.used)/$($mem.total)MB  procs=$procs"
+        } else {
+            Write-Log "WARNING: Server rejected metrics"
+        }
+    } catch {
+        Write-Log "WARNING: Failed to send metrics: $_"
+    }
+}
+
+# ── Command execution ─────────────────────────────────────────────────────────
+
+function Poll-Commands {
+    try {
+        $resp = Invoke-WebRequest `
+            -Uri     "$script:SKYWATCH_URL/api/agents/commands/pending" `
+            -Headers @{ 'Authorization' = "Bearer $script:AGENT_TOKEN" } `
+            -UseBasicParsing -TimeoutSec 10 -ErrorAction Stop
+
+        if ($resp.StatusCode -eq 204) { return }
+        if ($resp.StatusCode -ne 200) { return }
+
+        $data   = $resp.Content | ConvertFrom-Json
+        $cmdId  = $data.id
+        $cmdStr = $data.command
+        if (-not $cmdId -or -not $cmdStr) { return }
+
+        Write-Log "Running command #${cmdId}: ${cmdStr}"
+
+        $output   = ""
+        $exitCode = -1
+        try {
+            $proc = Start-Process -FilePath "powershell.exe" `
+                -ArgumentList "-NonInteractive", "-Command", $cmdStr `
+                -Wait -PassThru -NoNewWindow `
+                -RedirectStandardOutput "$env:TEMP\sw_cmd_out.txt" `
+                -RedirectStandardError  "$env:TEMP\sw_cmd_err.txt" `
+                -ErrorAction Stop
+            $exitCode = $proc.ExitCode
+            $stdout = if (Test-Path "$env:TEMP\sw_cmd_out.txt") { Get-Content "$env:TEMP\sw_cmd_out.txt" -Raw } else { "" }
+            $stderr = if (Test-Path "$env:TEMP\sw_cmd_err.txt") { Get-Content "$env:TEMP\sw_cmd_err.txt" -Raw } else { "" }
+            $output = ($stdout + $stderr).Substring(0, [Math]::Min(($stdout + $stderr).Length, 131072))
+        } catch {
+            $output   = "ERROR: $_"
+            $exitCode = 1
+        } finally {
+            Remove-Item "$env:TEMP\sw_cmd_out.txt", "$env:TEMP\sw_cmd_err.txt" -ErrorAction SilentlyContinue
+        }
+
+        $payload = @{ output = $output; exit_code = $exitCode } | ConvertTo-Json -Compress
+        Invoke-RestMethod `
+            -Uri     "$script:SKYWATCH_URL/api/agents/commands/$cmdId/result" `
+            -Method  POST `
+            -Body    $payload `
+            -Headers @{ 'Content-Type' = 'application/json'; 'Authorization' = "Bearer $script:AGENT_TOKEN" } `
+            -TimeoutSec 15 -ErrorAction SilentlyContinue | Out-Null
+
+    } catch [System.Net.WebException] {
+        # 204 No Content arrives as an exception in some PS versions — that's fine
+        if ($_.Exception.Response -and $_.Exception.Response.StatusCode -eq 204) { return }
+    } catch {
+        # Network errors — silently ignore
+    }
+}
+
+# ── Main ──────────────────────────────────────────────────────────────────────
+
+# Ensure log directory exists
+if (-not (Test-Path $InstallDir)) { New-Item -ItemType Directory -Path $InstallDir -Force | Out-Null }
+
+Load-Config
+
+if (-not $script:SKYWATCH_URL) {
+    Write-Error "SKYWATCH_URL is not set. Edit $ConfigFile or re-run the installer."
+    exit 1
+}
+
+if (-not $script:AGENT_TOKEN) {
+    if (-not (Register-Agent)) {
+        Write-Log "Retrying registration in 60s ..."
+        Start-Sleep -Seconds 60
+        if (-not (Register-Agent)) { exit 1 }
+    }
+}
+
+$interval = if ($script:REPORT_INTERVAL -gt 0) { $script:REPORT_INTERVAL } else { 60 }
+Write-Log "SkyWatch Agent v$VERSION started (Windows) — server=$script:SKYWATCH_URL  interval=${interval}s"
+
+while ($true) {
+    Send-Metrics
+    Poll-Commands
+    Start-Sleep -Seconds ($interval - 1)   # -1 accounts for the 1s CPU sample sleep
+}

agent/skywatch-agent.sh

@@ -0,0 +1,355 @@
+#!/bin/bash
+# SkyWatch Linux Agent v1.0.0
+# Collects system metrics and sends to SkyWatch monitoring server
+#
+# Metrics: CPU %, Memory, Disk, Network I/O, Load Average, Process Count
+# Requirements: bash 4+, curl, awk, df, /proc filesystem (standard Linux)
+#
+# Usage:
+#   Configured via CONFIG_FILE (default /etc/skywatch-agent.conf)
+#   Run via systemd (see install-agent.sh) or: bash skywatch-agent.sh
+
+VERSION="1.0.0"
+CONFIG_FILE="${CONFIG_FILE:-/etc/skywatch-agent.conf}"
+LOG_FILE="${LOG_FILE:-/var/log/skywatch-agent.log}"
+
+# Fall back to home dir if system paths aren't writable
+if [ ! -w "$(dirname "$CONFIG_FILE")" ] 2>/dev/null; then
+    CONFIG_FILE="$HOME/.skywatch-agent.conf"
+    LOG_FILE="$HOME/.skywatch-agent.log"
+fi
+
+log() {
+    local ts
+    ts=$(date '+%Y-%m-%d %H:%M:%S' 2>/dev/null || echo "")
+    local msg="[$ts] $*"
+    echo "$msg" >> "$LOG_FILE" 2>/dev/null || true
+    echo "$msg"
+}
+
+load_config() {
+    if [ -f "$CONFIG_FILE" ]; then
+        # shellcheck disable=SC1090
+        source "$CONFIG_FILE"
+    fi
+}
+
+save_config() {
+    cat > "$CONFIG_FILE" << CONF
+SKYWATCH_URL="${SKYWATCH_URL:-}"
+AGENT_TOKEN="${AGENT_TOKEN:-}"
+REPORT_INTERVAL="${REPORT_INTERVAL:-60}"
+AGENT_NAME="${AGENT_NAME:-}"
+REGISTRATION_KEY="${REGISTRATION_KEY:-}"
+CONF
+    chmod 600 "$CONFIG_FILE" 2>/dev/null || true
+}
+
+# CPU usage % — reads /proc/stat twice 1 second apart (that 1s is intentional)
+get_cpu_percent() {
+    local s1 s2
+    s1=$(grep '^cpu ' /proc/stat 2>/dev/null) || { echo "0.0"; return; }
+    sleep 1
+    s2=$(grep '^cpu ' /proc/stat 2>/dev/null) || { echo "0.0"; return; }
+    awk -v s1="$s1" -v s2="$s2" 'BEGIN {
+        n = split(s1, a)
+        split(s2, b)
+        t1 = 0; t2 = 0
+        for (i = 2; i <= n; i++) { t1 += a[i]; t2 += b[i] }
+        # idle + iowait (indices 5 and 6 in the array, which is index 4+5 in /proc/stat)
+        idle1 = a[5] + a[6]
+        idle2 = b[5] + b[6]
+        dt = t2 - t1
+        di = idle2 - idle1
+        if (dt <= 0) { printf "0.0"; exit }
+        printf "%.1f", (dt - di) * 100 / dt
+    }'
+}
+
+# Memory stats in MB
+get_memory() {
+    awk '
+        /^MemTotal:/    { total = int($2 / 1024) }
+        /^MemAvailable:/{ avail = int($2 / 1024) }
+        END {
+            used = total - avail
+            pct  = (total > 0) ? used * 100.0 / total : 0
+            printf "%d %d %.1f", total, used, pct
+        }
+    ' /proc/meminfo 2>/dev/null || echo "0 0 0.0"
+}
+
+# Disk info as a JSON array — real block devices only, no tmpfs/overlay
+get_disk_json() {
+    df -P -k \
+        -x tmpfs -x devtmpfs -x squashfs -x overlay \
+        2>/dev/null \
+    | tail -n +2 \
+    | grep '^/' \
+    | awk '
+        BEGIN { printf "["; c = 0 }
+        {
+            sub(/%/, "", $5)
+            mp = $6
+            # JSON-escape the mount path
+            gsub(/\\/, "\\\\", mp)
+            gsub(/"/, "\\\"", mp)
+            if (c > 0) printf ","
+            printf "{\"path\":\"%s\",\"total_mb\":%d,\"used_mb\":%d,\"percent\":%d}",
+                mp, int($2 / 1024), int($3 / 1024), $5
+            c++
+        }
+        END { printf "]" }
+    '
+}
+
+# Cumulative network bytes since boot (all interfaces except loopback)
+get_net_bytes() {
+    awk '
+        /:/ && !/lo:/ {
+            split($0, parts, ":")
+            split(parts[2], f)
+            recv += f[1]   # receive bytes
+            sent += f[9]   # transmit bytes
+        }
+        END { printf "%d %d", sent, recv }
+    ' /proc/net/dev 2>/dev/null || echo "0 0"
+}
+
+# 1/5/15-minute load averages
+get_load() {
+    awk '{ printf "%s %s %s", $1, $2, $3 }' /proc/loadavg 2>/dev/null || echo "0.00 0.00 0.00"
+}
+
+# System uptime in whole seconds
+get_uptime_seconds() {
+    awk '{ printf "%d", $1 }' /proc/uptime 2>/dev/null || echo "0"
+}
+
+# Number of running processes
+get_process_count() {
+    ls -d /proc/[0-9]* 2>/dev/null | wc -l | tr -d ' \n'
+}
+
+# Primary non-loopback IPv4 address
+get_ip_address() {
+    if command -v ip &>/dev/null; then
+        ip -4 route get 1.1.1.1 2>/dev/null \
+            | awk '/src/ { for(i=1;i<=NF;i++) if($i=="src"){ print $(i+1); exit } }'
+    elif command -v hostname &>/dev/null; then
+        hostname -I 2>/dev/null | awk '{print $1}'
+    fi
+}
+
+# OS description string
+get_os_info() {
+    if [ -f /etc/os-release ]; then
+        # shellcheck disable=SC1091
+        . /etc/os-release
+        echo "${PRETTY_NAME:-${NAME:-Linux}}"
+    else
+        uname -sr
+    fi
+}
+
+# Register this host with the server; saves token to config on success
+register_agent() {
+    local name="${AGENT_NAME:-$(hostname -f 2>/dev/null || hostname)}"
+    local hostname_val
+    hostname_val=$(hostname -f 2>/dev/null || hostname)
+    local ip
+    ip=$(get_ip_address || echo "")
+    local os
+    os=$(get_os_info)
+
+    # Sanitize values for JSON string embedding
+    local esc_name esc_host esc_os
+    esc_name="${name//\"/\\\"}"
+    esc_host="${hostname_val//\"/\\\"}"
+    esc_os="${os//\"/\\\"}"
+
+    log "Registering agent '${name}' with ${SKYWATCH_URL} ..."
+
+    # Build curl args as an array so we can conditionally add the registration key header
+    local -a curl_args
+    curl_args=(-sf -m 30 -X POST -H 'Content-Type: application/json')
+    [ -n "${REGISTRATION_KEY:-}" ] && curl_args+=(-H "X-Registration-Key: ${REGISTRATION_KEY}")
+    curl_args+=(-d "{\"name\":\"${esc_name}\",\"hostname\":\"${esc_host}\",\"ip_address\":\"${ip}\",\"os_info\":\"${esc_os}\"}")
+    curl_args+=("${SKYWATCH_URL}/api/agents/register")
+
+    local response
+    response=$(curl "${curl_args[@]}" 2>&1) || {
+        log "ERROR: Could not reach ${SKYWATCH_URL} during registration"
+        return 1
+    }
+
+    local token
+    token=$(echo "$response" | grep -o '"token":"[^"]*"' | sed 's/"token":"//; s/"$//')
+
+    if [ -z "$token" ]; then
+        log "ERROR: Registration failed. Server said: ${response}"
+        return 1
+    fi
+
+    AGENT_TOKEN="$token"
+    save_config
+    log "Registered. Token stored in ${CONFIG_FILE}"
+}
+
+# Collect all metrics and POST to /api/agents/report
+report_metrics() {
+    local cpu
+    cpu=$(get_cpu_percent)   # includes built-in 1 s sleep
+
+    local mem_total mem_used mem_percent
+    read -r mem_total mem_used mem_percent <<< "$(get_memory)"
+
+    local disk
+    disk=$(get_disk_json)
+
+    local net_sent net_recv
+    read -r net_sent net_recv <<< "$(get_net_bytes)"
+
+    local load1 load5 load15
+    read -r load1 load5 load15 <<< "$(get_load)"
+
+    local uptime_secs
+    uptime_secs=$(get_uptime_seconds)
+
+    local procs
+    procs=$(get_process_count)
+
+    local ip
+    ip=$(get_ip_address || echo "")
+
+    # Fallbacks so we always produce valid JSON
+    cpu="${cpu:-0.0}"
+    mem_total="${mem_total:-0}"
+    mem_used="${mem_used:-0}"
+    mem_percent="${mem_percent:-0.0}"
+    disk="${disk:-[]}"
+    net_sent="${net_sent:-0}"
+    net_recv="${net_recv:-0}"
+    load1="${load1:-0.00}"
+    load5="${load5:-0.00}"
+    load15="${load15:-0.00}"
+    uptime_secs="${uptime_secs:-0}"
+    procs="${procs:-0}"
+
+    local payload
+    payload=$(printf \
+        '{"cpu_percent":%s,"mem_total":%d,"mem_used":%d,"mem_percent":%s,"disk":%s,"load_1":%s,"load_5":%s,"load_15":%s,"uptime_seconds":%d,"process_count":%d,"net_bytes_sent":%s,"net_bytes_recv":%s,"ip_address":"%s"}' \
+        "$cpu" "$mem_total" "$mem_used" "$mem_percent" \
+        "$disk" "$load1" "$load5" "$load15" \
+        "$uptime_secs" "$procs" \
+        "$net_sent" "$net_recv" \
+        "${ip}")
+
+    local response
+    response=$(curl -sf -m 15 \
+        -X POST \
+        -H 'Content-Type: application/json' \
+        -H "Authorization: Bearer ${AGENT_TOKEN}" \
+        -d "$payload" \
+        "${SKYWATCH_URL}/api/agents/report" 2>&1) || {
+        log "WARNING: Failed to send metrics (network error)"
+        return 0
+    }
+
+    if echo "$response" | grep -q '"ok":true'; then
+        log "OK  cpu=${cpu}%  mem=${mem_used}/${mem_total}MB  load=${load1}"
+    else
+        log "WARNING: Server rejected metrics: ${response}"
+    fi
+}
+
+# Poll for and execute one pending command from the server
+poll_commands() {
+    local resp http_code
+    resp=$(curl -sf -m 10 \
+        -H "Authorization: Bearer ${AGENT_TOKEN}" \
+        -w '\n__HTTP_CODE__%{http_code}' \
+        "${SKYWATCH_URL}/api/agents/commands/pending" 2>/dev/null) || return 0
+
+    http_code=$(echo "$resp" | grep -o '__HTTP_CODE__[0-9]*' | tail -1 | grep -o '[0-9]*')
+    resp=$(echo "$resp" | sed '/__HTTP_CODE__/d')
+
+    # 204 = no pending commands
+    [ "$http_code" = "204" ] && return 0
+    [ "$http_code" != "200" ] && return 0
+
+    local cmd_id cmd_str
+    cmd_id=$(echo "$resp" | grep -o '"id":[0-9]*' | head -1 | grep -o '[0-9]*')
+    # Extract command value (handles escaped quotes)
+    cmd_str=$(echo "$resp" | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('command',''))" 2>/dev/null \
+        || echo "$resp" | sed -n 's/.*"command":"\([^"]*\)".*/\1/p')
+
+    [ -z "$cmd_id" ] || [ -z "$cmd_str" ] && return 0
+
+    log "Running command #${cmd_id}: ${cmd_str}"
+
+    # Execute with 60 s timeout, capture output, cap at 128 KB
+    local tmp_out exit_code
+    tmp_out=$(mktemp)
+    timeout 60 bash -c "$cmd_str" > "$tmp_out" 2>&1
+    exit_code=$?
+
+    # Truncate to 128 KB
+    truncate -s -"$(( $(wc -c < "$tmp_out") > 131072 ? $(wc -c < "$tmp_out") - 131072 : 0 ))" "$tmp_out" 2>/dev/null || true
+
+    # Build JSON payload via python (handles all escaping correctly)
+    local tmp_json
+    tmp_json=$(mktemp)
+    python3 - "$tmp_out" "$exit_code" > "$tmp_json" 2>/dev/null << 'PYEOF'
+import sys, json
+with open(sys.argv[1]) as f:
+    output = f.read(131072)
+print(json.dumps({"output": output, "exit_code": int(sys.argv[2])}))
+PYEOF
+
+    curl -sf -m 15 -X POST \
+        -H "Authorization: Bearer ${AGENT_TOKEN}" \
+        -H "Content-Type: application/json" \
+        -d "@${tmp_json}" \
+        "${SKYWATCH_URL}/api/agents/commands/${cmd_id}/result" >/dev/null 2>&1 || true
+
+    rm -f "$tmp_out" "$tmp_json"
+}
+
+main() {
+    load_config
+
+    if [ -z "${SKYWATCH_URL:-}" ]; then
+        echo "ERROR: SKYWATCH_URL is not set."
+        echo ""
+        echo "Create ${CONFIG_FILE} containing:"
+        echo "  SKYWATCH_URL=\"http://<your-server>:3001\""
+        echo ""
+        echo "Or use the installer:"
+        echo "  sudo bash install-agent.sh --server-url http://<your-server>:3001"
+        exit 1
+    fi
+
+    # Register on first run (no token stored yet)
+    if [ -z "${AGENT_TOKEN:-}" ]; then
+        if ! register_agent; then
+            log "Retrying registration in 60 s..."
+            sleep 60
+            register_agent || exit 1
+        fi
+    fi
+
+    local interval="${REPORT_INTERVAL:-60}"
+    log "SkyWatch Agent v${VERSION} started — server=${SKYWATCH_URL}  interval=${interval}s"
+
+    while true; do
+        report_metrics
+        poll_commands
+        # get_cpu_percent already consumed ~1 s; subtract it from the sleep
+        local sleep_time=$(( interval - 1 ))
+        [ "$sleep_time" -lt 1 ] && sleep_time=1
+        sleep "$sleep_time"
+    done
+}
+
+main "$@"

client/build/asset-manifest.json

@@ -1,15 +1,15 @@
 {
   "files": {
-    "main.css": "/static/css/main.d4111563.css",
+    "main.css": "/static/css/main.b251a0fb.css",
-    "main.js": "/static/js/main.ee340b3d.js",
+    "main.js": "/static/js/main.b7e3c916.js",
     "static/js/453.d456ce70.chunk.js": "/static/js/453.d456ce70.chunk.js",
     "index.html": "/index.html",
-    "main.d4111563.css.map": "/static/css/main.d4111563.css.map",
+    "main.b251a0fb.css.map": "/static/css/main.b251a0fb.css.map",
-    "main.ee340b3d.js.map": "/static/js/main.ee340b3d.js.map",
+    "main.b7e3c916.js.map": "/static/js/main.b7e3c916.js.map",
     "453.d456ce70.chunk.js.map": "/static/js/453.d456ce70.chunk.js.map"
   },
   "entrypoints": [
-    "static/css/main.d4111563.css",
+    "static/css/main.b251a0fb.css",
-    "static/js/main.ee340b3d.js"
+    "static/js/main.b7e3c916.js"
   ]
 }

client/build/index.html

@@ -1 +1 @@
-<!doctype html><html lang="en" data-theme="dark"><head><meta charset="utf-8"/><link rel="icon" type="image/png" href="/app-icon.png"/><meta name="viewport" content="width=device-width,initial-scale=1"/><meta name="theme-color" content="#000000"/><meta name="description" content="SkyWatch - Infrastructure monitoring and alerting system"/><link rel="apple-touch-icon" href="/app-icon.png"/><link rel="manifest" href="/manifest.json"/><title>SkyWatch</title><script defer="defer" src="/static/js/main.ee340b3d.js"></script><link href="/static/css/main.d4111563.css" rel="stylesheet"></head><body><noscript>You need to enable JavaScript to run this app.</noscript><div id="root"></div></body></html>
+<!doctype html><html lang="en" data-theme="dark"><head><meta charset="utf-8"/><link rel="icon" type="image/png" href="/app-icon.png"/><meta name="viewport" content="width=device-width,initial-scale=1"/><meta name="theme-color" content="#000000"/><meta name="description" content="SkyWatch - Infrastructure monitoring and alerting system"/><link rel="apple-touch-icon" href="/app-icon.png"/><link rel="manifest" href="/manifest.json"/><title>SkyWatch</title><script defer="defer" src="/static/js/main.b7e3c916.js"></script><link href="/static/css/main.b251a0fb.css" rel="stylesheet"></head><body><noscript>You need to enable JavaScript to run this app.</noscript><div id="root"></div></body></html>

client/build/static/css/main.b251a0fb.css

@@ -1,2 +1,2 @@
-body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#020617;color:#e2e8f0;font-family:Manrope,IBM Plex Sans,Segoe UI,sans-serif;margin:0}*{box-sizing:border-box}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}@keyframes skeleton-pulse{0%,to{opacity:.4}50%{opacity:.8}}.skeleton{animation:skeleton-pulse 1.4s ease-in-out infinite;background:#1e293b;background:var(--surface-2);border-radius:4px}.skeleton-row{min-height:72px;pointer-events:none}.skeleton-name{height:14px;margin-bottom:8px;width:40%}.skeleton-url{height:11px;width:60%}.skeleton-badge{border-radius:12px;height:22px;width:56px}.action-delete-confirm{color:#ef4444!important}.discovery-scanning{align-items:center;color:#94a3b8;color:var(--text-muted);display:flex;gap:.75rem;padding:1rem 0}@keyframes spin{to{transform:rotate(1turn)}}.discovery-spinner{animation:spin .8s linear infinite;border:2px solid #334155;border-top-color:#14b8a6;border:2px solid 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#334155;border-radius:10px;color:#e2e8f0;min-width:180px;padding:.5rem .75rem}.actions-menu-wrapper{position:relative}.actions-menu{background:#fff;border:1px solid #Line truncated
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client/build/static/js/main.ee340b3d.js.map

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client/src/Agents.css

@@ -0,0 +1,517 @@
+/* ── Page layout ─────────────────────────────────────── */
+.agents-page { padding-top: 2rem; }
+
+.ag-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  flex-wrap: wrap;
+  gap: 1rem;
+  margin-bottom: 1.5rem;
+}
+
+.ag-header-left {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+  flex-wrap: wrap;
+}
+
+.ag-page-title {
+  font-size: 1.4rem;
+  font-weight: 700;
+  color: var(--text);
+  margin: 0;
+}
+
+.ag-count-pill {
+  padding: 0.2rem 0.65rem;
+  border-radius: 99px;
+  background: #0d3d35;
+  color: #34d399;
+  font-size: 0.8rem;
+  font-weight: 600;
+  letter-spacing: 0.02em;
+}
+
+/* ── Add-agent button ────────────────────────────────── */
+.ag-install-toggle {
+  padding: 0.5rem 1.1rem;
+  border-radius: 8px;
+  border: 1px solid var(--border);
+  background: var(--surface-2);
+  color: var(--text);
+  cursor: pointer;
+  font-weight: 600;
+  font-size: 0.9rem;
+  transition: background 0.15s, border-color 0.15s;
+}
+.ag-install-toggle:hover { background: var(--border); }
+.ag-install-toggle-active { border-color: var(--accent); color: var(--accent); }
+
+/* ── Platform tabs ───────────────────────────────────── */
+.ag-platform-tabs {
+  display: flex;
+  gap: 0.4rem;
+  margin: 0.75rem 0 1rem;
+  flex-wrap: wrap;
+}
+
+.ag-platform-tab {
+  padding: 0.35rem 0.85rem;
+  border-radius: 8px;
+  border: 1px solid var(--border);
+  background: var(--surface-2);
+  color: var(--text-muted);
+  cursor: pointer;
+  font-size: 0.85rem;
+  font-weight: 600;
+  transition: background 0.15s, border-color 0.15s, color 0.15s;
+}
+.ag-platform-tab:hover { background: var(--border); color: var(--text); }
+.ag-platform-tab-active {
+  background: rgba(20,184,166,0.12);
+  border-color: var(--accent);
+  color: var(--accent);
+}
+
+/* ── Install panel ───────────────────────────────────── */
+.ag-install-panel {
+  margin-bottom: 2rem;
+  padding: 1.5rem;
+  border: 1px solid var(--border);
+  border-radius: 14px;
+  background: var(--surface);
+}
+
+.ag-install-title {
+  margin: 0 0 0.4rem;
+  font-size: 1rem;
+  font-weight: 700;
+  color: var(--text);
+}
+
+.ag-install-note {
+  color: var(--text-muted);
+  font-size: 0.87rem;
+  margin: 0 0 1.25rem;
+  line-height: 1.5;
+}
+.ag-install-note code {
+  background: var(--surface-2);
+  padding: 0.1rem 0.35rem;
+  border-radius: 4px;
+  font-size: 0.82rem;
+  color: var(--accent);
+  font-family: 'SF Mono', 'Cascadia Code', monospace;
+}
+.ag-install-note-sm { margin-top: 1.25rem; margin-bottom: 0; }
+
+.ag-install-steps { display: flex; flex-direction: column; gap: 1rem; }
+
+.ag-step { display: flex; align-items: flex-start; gap: 1rem; }
+
+.ag-step-num {
+  flex-shrink: 0;
+  width: 26px; height: 26px;
+  border-radius: 50%;
+  background: var(--surface-2);
+  border: 1px solid var(--border);
+  color: var(--accent);
+  font-weight: 700;
+  font-size: 0.82rem;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.ag-step-body { flex: 1; display: flex; flex-direction: column; gap: 0.4rem; min-width: 0; }
+.ag-step-label { font-size: 0.82rem; color: var(--text-muted); font-weight: 600; }
+
+.ag-cmd-row {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  background: #050e1f;
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  padding: 0.5rem 0.75rem;
+  overflow: hidden;
+}
+
+.ag-cmd {
+  flex: 1;
+  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;
+  font-size: 0.8rem;
+  color: #a5f3fc;
+  overflow-x: auto;
+  white-space: nowrap;
+}
+
+.ag-copy-btn {
+  flex-shrink: 0;
+  background: none;
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  color: var(--text-muted);
+  cursor: pointer;
+  padding: 0.15rem 0.45rem;
+  font-size: 0.88rem;
+  transition: color 0.15s, border-color 0.15s;
+}
+.ag-copy-btn:hover { color: var(--accent); border-color: var(--accent); }
+.ag-copy-btn.copied { color: #34d399; border-color: #34d399; }
+
+/* ── Agent grid ──────────────────────────────────────── */
+.ag-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
+  gap: 1.5rem;
+}
+
+/* ── Agent card ──────────────────────────────────────── */
+.ag-card {
+  padding: 1.25rem;
+  border: 1px solid var(--border);
+  border-left-width: 3px;
+  border-radius: 14px;
+  background: var(--surface);
+  display: flex;
+  flex-direction: column;
+  gap: 0;
+}
+
+.ag-online  { border-left-color: #14b8a6; }
+.ag-offline { border-left-color: #475569; opacity: 0.8; }
+
+.ag-card-head {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 0.75rem;
+  margin-bottom: 0.55rem;
+}
+
+.ag-card-identity {
+  display: flex;
+  align-items: center;
+  gap: 0.6rem;
+  min-width: 0;
+}
+
+.ag-dot {
+  flex-shrink: 0;
+  width: 10px; height: 10px;
+  border-radius: 50%;
+}
+.ag-dot-on  { background: #14b8a6; box-shadow: 0 0 7px #14b8a680; }
+.ag-dot-off { background: #475569; }
+
+.ag-name {
+  font-weight: 700;
+  font-size: 0.98rem;
+  color: var(--text);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.ag-sub {
+  font-size: 0.77rem;
+  color: var(--text-muted);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  margin-top: 1px;
+}
+
+.ag-card-actions { display: flex; gap: 0.35rem; flex-shrink: 0; margin-top: 2px; }
+
+.ag-btn {
+  padding: 0.18rem 0.55rem;
+  border-radius: 6px;
+  font-size: 0.78rem;
+  font-weight: 600;
+  cursor: pointer;
+  border: 1px solid transparent;
+  transition: background 0.15s, color 0.15s;
+  line-height: 1.4;
+}
+.ag-btn-ghost {
+  background: transparent;
+  border-color: var(--border);
+  color: var(--text-muted);
+}
+.ag-btn-ghost:hover { border-color: #ef4444; color: #ef4444; }
+.ag-btn-danger { background: #450a0a; border-color: #b91c1c; color: #fca5a5; }
+.ag-btn-danger:hover { background: #7f1d1d; }
+.ag-btn-cancel { background: transparent; border-color: var(--border); color: var(--text-muted); }
+.ag-btn-cancel:hover { background: var(--surface-2); }
+.ag-btn-terminal {
+  background: transparent;
+  border-color: var(--border);
+  color: var(--text-muted);
+  font-family: 'SF Mono', 'Cascadia Code', monospace;
+  letter-spacing: -0.02em;
+}
+.ag-btn-terminal:hover { border-color: var(--accent); color: var(--accent); }
+.ag-btn-terminal-active { border-color: var(--accent); color: var(--accent); background: rgba(20,184,166,0.1); }
+
+/* ── OS + status row ─────────────────────────────────── */
+.ag-meta {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  flex-wrap: wrap;
+  gap: 0.4rem;
+  margin-bottom: 1rem;
+}
+
+.ag-os-tag {
+  font-size: 0.73rem;
+  padding: 0.15rem 0.55rem;
+  border-radius: 4px;
+  background: var(--surface-2);
+  color: var(--text-muted);
+  border: 1px solid var(--border);
+  max-width: 180px;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.ag-status-text { font-size: 0.77rem; font-weight: 600; }
+.ag-status-on  { color: #34d399; }
+.ag-status-off { color: var(--text-dim); font-weight: 400; }
+
+/* ── Gauge bars ──────────────────────────────────────── */
+.ag-gauges { display: flex; flex-direction: column; gap: 0.65rem; margin-bottom: 1rem; }
+
+.ag-gauge-row {
+  display: flex;
+  justify-content: space-between;
+  align-items: baseline;
+  margin-bottom: 0.2rem;
+}
+
+.ag-gauge-label {
+  font-size: 0.76rem;
+  color: var(--text-muted);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  max-width: 72%;
+}
+
+.ag-gauge-val {
+  font-size: 0.76rem;
+  font-weight: 700;
+  color: var(--text);
+}
+
+.ag-gauge-track {
+  height: 5px;
+  background: var(--surface-2);
+  border-radius: 3px;
+  overflow: hidden;
+}
+
+.ag-gauge-fill {
+  height: 100%;
+  border-radius: 3px;
+  transition: width 0.4s ease;
+}
+
+/* ── Stats grid ──────────────────────────────────────── */
+.ag-stats {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  gap: 0.6rem 0.4rem;
+  padding-top: 0.75rem;
+  border-top: 1px solid var(--border);
+}
+
+.ag-stat-label {
+  font-size: 0.68rem;
+  color: var(--text-dim);
+  text-transform: uppercase;
+  letter-spacing: 0.04em;
+}
+
+.ag-stat-val {
+  font-size: 0.85rem;
+  font-weight: 600;
+  color: var(--text);
+  margin-top: 0.15rem;
+  word-break: break-all;
+}
+
+.ag-stat-val-sm { font-size: 0.75rem; }
+
+/* ── Empty / loading states ──────────────────────────── */
+.ag-no-data {
+  text-align: center;
+  padding: 1.25rem 0 0.5rem;
+  color: var(--text-dim);
+  font-size: 0.85rem;
+}
+
+.ag-loading {
+  color: var(--text-muted);
+  padding: 4rem 0;
+  text-align: center;
+  font-size: 0.95rem;
+}
+
+.ag-empty {
+  text-align: center;
+  padding: 5rem 1rem;
+}
+.ag-empty-icon { font-size: 3rem; margin-bottom: 0.75rem; line-height: 1; }
+.ag-empty-title { font-size: 1.1rem; font-weight: 700; color: var(--text); margin-bottom: 0.4rem; }
+.ag-empty-sub { color: var(--text-muted); font-size: 0.9rem; line-height: 1.6; }
+
+/* ── Command terminal ────────────────────────────────── */
+.ag-terminal {
+  margin-top: 1.25rem;
+  padding-top: 1rem;
+  border-top: 1px solid var(--border);
+}
+
+.ag-terminal-title {
+  font-size: 0.72rem;
+  text-transform: uppercase;
+  letter-spacing: 0.06em;
+  color: var(--text-dim);
+  margin-bottom: 0.6rem;
+}
+
+.ag-terminal-input-row {
+  display: flex;
+  align-items: center;
+  gap: 0.4rem;
+  background: #050e1f;
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  padding: 0.4rem 0.65rem;
+  margin-bottom: 0.75rem;
+}
+
+.ag-terminal-prompt {
+  color: var(--accent);
+  font-family: 'SF Mono', 'Cascadia Code', monospace;
+  font-size: 0.85rem;
+  flex-shrink: 0;
+}
+
+.ag-terminal-input {
+  flex: 1;
+  background: none;
+  border: none;
+  outline: none;
+  color: #e2e8f0;
+  font-family: 'SF Mono', 'Cascadia Code', monospace;
+  font-size: 0.82rem;
+  min-width: 0;
+}
+.ag-terminal-input::placeholder { color: #334155; }
+
+.ag-terminal-run {
+  flex-shrink: 0;
+  padding: 0.15rem 0.6rem;
+  background: rgba(20,184,166,0.15);
+  border: 1px solid var(--accent);
+  border-radius: 5px;
+  color: var(--accent);
+  cursor: pointer;
+  font-size: 0.78rem;
+  font-weight: 700;
+  transition: background 0.15s;
+}
+.ag-terminal-run:hover:not(:disabled) { background: rgba(20,184,166,0.3); }
+.ag-terminal-run:disabled { opacity: 0.4; cursor: default; }
+
+.ag-terminal-history {
+  display: flex;
+  flex-direction: column;
+  gap: 0.3rem;
+  max-height: 240px;
+  overflow-y: auto;
+}
+
+.ag-terminal-empty {
+  font-size: 0.8rem;
+  color: var(--text-dim);
+  text-align: center;
+  padding: 0.75rem 0;
+}
+
+.ag-terminal-entry {
+  border-radius: 6px;
+  border: 1px solid var(--border);
+  overflow: hidden;
+}
+
+.ag-terminal-entry-head {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.3rem 0.55rem;
+  cursor: default;
+  background: var(--surface-2);
+}
+.ag-terminal-entry-head:has(.ag-terminal-expand) { cursor: pointer; }
+.ag-terminal-entry-head:hover { background: #1e293b; }
+
+.ag-cmd-status {
+  flex-shrink: 0;
+  font-size: 0.75rem;
+  font-weight: 700;
+  width: 14px;
+  text-align: center;
+}
+.ag-cmd-status-completed { color: #34d399; }
+.ag-cmd-status-failed    { color: #f87171; }
+.ag-cmd-status-running   { color: #fbbf24; }
+.ag-cmd-status-pending   { color: #64748b; }
+
+.ag-terminal-entry-cmd {
+  flex: 1;
+  font-family: 'SF Mono', 'Cascadia Code', monospace;
+  font-size: 0.78rem;
+  color: #a5f3fc;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.ag-terminal-entry-time {
+  flex-shrink: 0;
+  font-size: 0.7rem;
+  color: var(--text-dim);
+}
+
+.ag-terminal-expand {
+  flex-shrink: 0;
+  font-size: 0.65rem;
+  color: var(--text-dim);
+}
+
+.ag-terminal-output {
+  margin: 0;
+  padding: 0.55rem 0.65rem;
+  background: #050e1f;
+  font-family: 'SF Mono', 'Cascadia Code', monospace;
+  font-size: 0.75rem;
+  color: #94a3b8;
+  white-space: pre-wrap;
+  word-break: break-all;
+  max-height: 200px;
+  overflow-y: auto;
+}
+
+/* ── Responsive ──────────────────────────────────────── */
+@media (max-width: 600px) {
+  .ag-grid { grid-template-columns: 1fr; gap: 1rem; }
+  .ag-stats { grid-template-columns: repeat(2, 1fr); }
+}

client/src/Agents.js

@@ -0,0 +1,504 @@
+import React, { useState, useEffect, useCallback, useRef } from 'react';
+import axios from 'axios';
+import './Agents.css';
+
+// ── Formatters ────────────────────────────────────────────────────────────────
+
+function fmtBytes(bytes) {
+  if (bytes == null) return '—';
+  const gb = bytes / 1073741824;
+  if (gb >= 1) return `${gb.toFixed(1)} GB`;
+  const mb = bytes / 1048576;
+  if (mb >= 1) return `${mb.toFixed(0)} MB`;
+  return `${(bytes / 1024).toFixed(0)} KB`;
+}
+
+function fmtUptime(secs) {
+  if (!secs) return '—';
+  const d = Math.floor(secs / 86400);
+  const h = Math.floor((secs % 86400) / 3600);
+  const m = Math.floor((secs % 3600) / 60);
+  if (d > 0) return `${d}d ${h}h`;
+  if (h > 0) return `${h}h ${m}m`;
+  return `${m}m`;
+}
+
+function fmtLoad(v) {
+  return v != null ? Number(v).toFixed(2) : '—';
+}
+
+function isOnline(lastSeenAt) {
+  if (!lastSeenAt) return false;
+  return Date.now() - new Date(lastSeenAt).getTime() < 3 * 60 * 1000;
+}
+
+function timeAgo(ts) {
+  if (!ts) return 'Never';
+  const diff = Math.floor((Date.now() - new Date(ts).getTime()) / 1000);
+  if (diff < 60) return `${diff}s ago`;
+  if (diff < 3600) return `${Math.floor(diff / 60)}m ago`;
+  if (diff < 86400) return `${Math.floor(diff / 3600)}h ago`;
+  return new Date(ts).toLocaleDateString();
+}
+
+// ── Gauge bar ─────────────────────────────────────────────────────────────────
+
+function Gauge({ value, label }) {
+  const pct = Math.min(100, Math.max(0, value ?? 0));
+  const color = pct > 90 ? '#ef4444' : pct > 75 ? '#f59e0b' : '#14b8a6';
+  return (
+    <div className="ag-gauge">
+      <div className="ag-gauge-row">
+        <span className="ag-gauge-label" title={label}>{label}</span>
+        <span className="ag-gauge-val">{pct.toFixed(1)}%</span>
+      </div>
+      <div className="ag-gauge-track">
+        <div className="ag-gauge-fill" style={{ width: `${pct}%`, background: color }} />
+      </div>
+    </div>
+  );
+}
+
+// ── Copy-to-clipboard command line ────────────────────────────────────────────
+
+function CopyCmd({ cmd }) {
+  const [copied, setCopied] = useState(false);
+
+  const copy = () => {
+    navigator.clipboard.writeText(cmd).then(() => {
+      setCopied(true);
+      setTimeout(() => setCopied(false), 2000);
+    }).catch(() => {
+      // fallback for older browsers
+      const el = document.createElement('textarea');
+      el.value = cmd;
+      document.body.appendChild(el);
+      el.select();
+      document.execCommand('copy');
+      document.body.removeChild(el);
+      setCopied(true);
+      setTimeout(() => setCopied(false), 2000);
+    });
+  };
+
+  return (
+    <div className="ag-cmd-row">
+      <code className="ag-cmd">{cmd}</code>
+      <button
+        className={`ag-copy-btn${copied ? ' copied' : ''}`}
+        onClick={copy}
+        title="Copy to clipboard"
+      >
+        {copied ? '✓' : '⎘'}
+      </button>
+    </div>
+  );
+}
+
+// ── Platform-specific install steps ──────────────────────────────────────────
+
+function LinuxSteps({ serverUrl }) {
+  return (
+    <>
+      <p className="ag-install-note">
+        Ubuntu 16.04+ / Debian 9+ / RHEL 7+. Runs as a systemd service.
+      </p>
+      <div className="ag-install-steps">
+        <div className="ag-step">
+          <span className="ag-step-num">1</span>
+          <div className="ag-step-body">
+            <div className="ag-step-label">Download the scripts</div>
+            <CopyCmd cmd={`curl -fsSL ${serverUrl}/api/agents/script    -o skywatch-agent.sh`} />
+            <CopyCmd cmd={`curl -fsSL ${serverUrl}/api/agents/installer  -o install-agent.sh`} />
+          </div>
+        </div>
+        <div className="ag-step">
+          <span className="ag-step-num">2</span>
+          <div className="ag-step-body">
+            <div className="ag-step-label">Run the installer as root</div>
+            <CopyCmd cmd={`sudo bash install-agent.sh --server-url ${serverUrl}`} />
+          </div>
+        </div>
+      </div>
+      <p className="ag-install-note ag-install-note-sm">
+        Optional: <code>--interval&nbsp;&lt;secs&gt;</code>, <code>--name&nbsp;&lt;label&gt;</code>,{' '}
+        <code>--registration-key&nbsp;&lt;key&gt;</code>.
+        Remove: <code>sudo bash install-agent.sh --uninstall</code>
+      </p>
+    </>
+  );
+}
+
+function MacosSteps({ serverUrl }) {
+  return (
+    <>
+      <p className="ag-install-note">
+        macOS 10.15+ (Intel &amp; Apple Silicon). Runs as a launchd system daemon.
+      </p>
+      <div className="ag-install-steps">
+        <div className="ag-step">
+          <span className="ag-step-num">1</span>
+          <div className="ag-step-body">
+            <div className="ag-step-label">Download the scripts</div>
+            <CopyCmd cmd={`curl -fsSL ${serverUrl}/api/agents/script-macos    -o skywatch-agent-macos.sh`} />
+            <CopyCmd cmd={`curl -fsSL ${serverUrl}/api/agents/installer-macos  -o install-agent-macos.sh`} />
+          </div>
+        </div>
+        <div className="ag-step">
+          <span className="ag-step-num">2</span>
+          <div className="ag-step-body">
+            <div className="ag-step-label">Run the installer as root</div>
+            <CopyCmd cmd={`sudo bash install-agent-macos.sh --server-url ${serverUrl}`} />
+          </div>
+        </div>
+      </div>
+      <p className="ag-install-note ag-install-note-sm">
+        Optional: <code>--interval&nbsp;&lt;secs&gt;</code>, <code>--name&nbsp;&lt;label&gt;</code>,{' '}
+        <code>--registration-key&nbsp;&lt;key&gt;</code>.
+        Remove: <code>sudo bash install-agent-macos.sh --uninstall</code>
+      </p>
+    </>
+  );
+}
+
+function WindowsSteps({ serverUrl }) {
+  return (
+    <>
+      <p className="ag-install-note">
+        Windows 10 / 11 / Server 2019+. Runs via Task Scheduler as SYSTEM.
+        Open <strong>PowerShell as Administrator</strong> and run:
+      </p>
+      <div className="ag-install-steps">
+        <div className="ag-step">
+          <span className="ag-step-num">1</span>
+          <div className="ag-step-body">
+            <div className="ag-step-label">Download the installer</div>
+            <CopyCmd cmd={`Invoke-WebRequest "${serverUrl}/api/agents/installer-windows" -OutFile install-agent-windows.ps1`} />
+          </div>
+        </div>
+        <div className="ag-step">
+          <span className="ag-step-num">2</span>
+          <div className="ag-step-body">
+            <div className="ag-step-label">Run the installer</div>
+            <CopyCmd cmd={`.\\install-agent-windows.ps1 -ServerUrl "${serverUrl}"`} />
+          </div>
+        </div>
+      </div>
+      <p className="ag-install-note ag-install-note-sm">
+        Optional: <code>-Interval&nbsp;&lt;secs&gt;</code>, <code>-AgentName&nbsp;&lt;label&gt;</code>,{' '}
+        <code>-RegistrationKey&nbsp;&lt;key&gt;</code>.
+        Remove: <code>.\\install-agent-windows.ps1&nbsp;-Uninstall</code>
+      </p>
+    </>
+  );
+}
+
+// ── Install instructions panel ────────────────────────────────────────────────
+
+const PLATFORMS = [
+  { id: 'linux',   label: '🐧 Linux'   },
+  { id: 'macos',   label: '🍎 macOS'   },
+  { id: 'windows', label: '🪟 Windows' },
+];
+
+function InstallPanel({ serverUrl }) {
+  const [platform, setPlatform] = useState('linux');
+
+  return (
+    <div className="ag-install-panel">
+      <h3 className="ag-install-title">Install agent on a host</h3>
+
+      <div className="ag-platform-tabs">
+        {PLATFORMS.map(p => (
+          <button
+            key={p.id}
+            className={`ag-platform-tab${platform === p.id ? ' ag-platform-tab-active' : ''}`}
+            onClick={() => setPlatform(p.id)}
+          >
+            {p.label}
+          </button>
+        ))}
+      </div>
+
+      {platform === 'linux'   && <LinuxSteps   serverUrl={serverUrl} />}
+      {platform === 'macos'   && <MacosSteps   serverUrl={serverUrl} />}
+      {platform === 'windows' && <WindowsSteps serverUrl={serverUrl} />}
+    </div>
+  );
+}
+
+// ── Command terminal panel ────────────────────────────────────────────────────
+
+function CommandTerminal({ agentId, agentName }) {
+  const [commands, setCommands] = useState([]);
+  const [input, setInput]       = useState('');
+  const [sending, setSending]   = useState(false);
+  const [expanded, setExpanded] = useState({});
+  const pollRef = useRef(null);
+
+  const fetchCommands = useCallback(async () => {
+    try {
+      const { data } = await axios.get(`/api/agents/${agentId}/commands`);
+      setCommands(data.commands || []);
+    } catch (_) {}
+  }, [agentId]);
+
+  useEffect(() => {
+    fetchCommands();
+    pollRef.current = setInterval(fetchCommands, 4000);
+    return () => clearInterval(pollRef.current);
+  }, [fetchCommands]);
+
+  const send = async () => {
+    const cmd = input.trim();
+    if (!cmd || sending) return;
+    setSending(true);
+    try {
+      await axios.post(`/api/agents/${agentId}/commands`, { command: cmd });
+      setInput('');
+      fetchCommands();
+    } catch (_) {}
+    setSending(false);
+  };
+
+  const onKey = (e) => {
+    if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); send(); }
+  };
+
+  const toggleExpand = (id) => setExpanded(prev => ({ ...prev, [id]: !prev[id] }));
+
+  const statusIcon = (s) => s === 'completed' ? '✓' : s === 'failed' ? '✗' : s === 'running' ? '↻' : '…';
+  const statusClass = (s) => `ag-cmd-status ag-cmd-status-${s}`;
+
+  return (
+    <div className="ag-terminal">
+      <div className="ag-terminal-title">Terminal — {agentName}</div>
+
+      <div className="ag-terminal-input-row">
+        <span className="ag-terminal-prompt">$</span>
+        <input
+          className="ag-terminal-input"
+          value={input}
+          onChange={e => setInput(e.target.value)}
+          onKeyDown={onKey}
+          placeholder="Enter command…"
+          spellCheck={false}
+          autoComplete="off"
+        />
+        <button
+          className="ag-terminal-run"
+          onClick={send}
+          disabled={!input.trim() || sending}
+        >
+          {sending ? '…' : 'Run'}
+        </button>
+      </div>
+
+      <div className="ag-terminal-history">
+        {commands.length === 0 && (
+          <div className="ag-terminal-empty">No commands yet.</div>
+        )}
+        {commands.map(cmd => (
+          <div key={cmd.id} className="ag-terminal-entry">
+            <div className="ag-terminal-entry-head" onClick={() => cmd.output && toggleExpand(cmd.id)}>
+              <span className={statusClass(cmd.status)}>{statusIcon(cmd.status)}</span>
+              <code className="ag-terminal-entry-cmd">{cmd.command}</code>
+              <span className="ag-terminal-entry-time">{timeAgo(cmd.created_at)}</span>
+              {cmd.output && (
+                <span className="ag-terminal-expand">{expanded[cmd.id] ? '▲' : '▼'}</span>
+              )}
+            </div>
+            {expanded[cmd.id] && cmd.output && (
+              <pre className="ag-terminal-output">{cmd.output}</pre>
+            )}
+          </div>
+        ))}
+      </div>
+    </div>
+  );
+}
+
+// ── Single agent card ─────────────────────────────────────────────────────────
+
+function AgentCard({ agent, onDelete }) {
+  const [confirmDel, setConfirmDel] = useState(false);
+  const [showTerminal, setShowTerminal] = useState(false);
+  const online = isOnline(agent.last_seen_at);
+  const topDisks = (agent.disk || []).slice(0, 3);
+
+  return (
+    <div className={`ag-card ${online ? 'ag-online' : 'ag-offline'}`}>
+
+      {/* ── Header row ── */}
+      <div className="ag-card-head">
+        <div className="ag-card-identity">
+          <span className={`ag-dot ${online ? 'ag-dot-on' : 'ag-dot-off'}`} />
+          <div style={{ minWidth: 0 }}>
+            <div className="ag-name" title={agent.name}>{agent.name}</div>
+            <div className="ag-sub" title={`${agent.hostname} · ${agent.ip_address || '?'}`}>
+              {agent.hostname} · {agent.ip_address || '?'}
+            </div>
+          </div>
+        </div>
+
+        <div className="ag-card-actions">
+          <button
+            className={`ag-btn ag-btn-terminal${showTerminal ? ' ag-btn-terminal-active' : ''}`}
+            onClick={() => setShowTerminal(v => !v)}
+            title="Open terminal"
+          >&gt;_</button>
+          {confirmDel ? (
+            <>
+              <button className="ag-btn ag-btn-danger" onClick={() => onDelete(agent.id)}>Delete</button>
+              <button className="ag-btn ag-btn-cancel" onClick={() => setConfirmDel(false)}>Cancel</button>
+            </>
+          ) : (
+            <button
+              className="ag-btn ag-btn-ghost"
+              onClick={() => setConfirmDel(true)}
+              title="Remove agent"
+            >✕</button>
+          )}
+        </div>
+      </div>
+
+      {/* ── OS + status ── */}
+      <div className="ag-meta">
+        <span className="ag-os-tag" title={agent.os_info}>{agent.os_info || 'Linux'}</span>
+        <span className={`ag-status-text ${online ? 'ag-status-on' : 'ag-status-off'}`}>
+          {online ? '● Online' : `Last seen ${timeAgo(agent.last_seen_at)}`}
+        </span>
+      </div>
+
+      {/* ── Metrics ── */}
+      {agent.cpu_percent != null ? (
+        <>
+          <div className="ag-gauges">
+            <Gauge value={agent.cpu_percent} label="CPU" />
+            <Gauge
+              value={agent.mem_percent}
+              label={`Memory  ${(agent.mem_used ?? 0).toLocaleString()} / ${(agent.mem_total ?? 0).toLocaleString()} MB`}
+            />
+            {topDisks.map((d, i) => (
+              <Gauge key={i} value={d.percent} label={`Disk ${d.path}`} />
+            ))}
+          </div>
+
+          <div className="ag-stats">
+            <div>
+              <div className="ag-stat-label">Load avg</div>
+              <div className="ag-stat-val" style={{ fontSize: '0.8rem' }}>
+                {fmtLoad(agent.load_1)} / {fmtLoad(agent.load_5)} / {fmtLoad(agent.load_15)}
+              </div>
+            </div>
+            <div>
+              <div className="ag-stat-label">Processes</div>
+              <div className="ag-stat-val">{agent.process_count ?? '—'}</div>
+            </div>
+            <div>
+              <div className="ag-stat-label">Uptime</div>
+              <div className="ag-stat-val">{fmtUptime(agent.uptime_seconds)}</div>
+            </div>
+            <div>
+              <div className="ag-stat-label">Net sent</div>
+              <div className="ag-stat-val ag-stat-val-sm">{fmtBytes(agent.net_bytes_sent)}</div>
+            </div>
+            <div>
+              <div className="ag-stat-label">Net recv</div>
+              <div className="ag-stat-val ag-stat-val-sm">{fmtBytes(agent.net_bytes_recv)}</div>
+            </div>
+            <div>
+              <div className="ag-stat-label">Reported</div>
+              <div className="ag-stat-val ag-stat-val-sm">{timeAgo(agent.last_metric_at)}</div>
+            </div>
+          </div>
+        </>
+      ) : (
+        <div className="ag-no-data">Waiting for first report…</div>
+      )}
+
+      {showTerminal && (
+        <CommandTerminal agentId={agent.id} agentName={agent.name} />
+      )}
+    </div>
+  );
+}
+
+// ── Main page ─────────────────────────────────────────────────────────────────
+
+export default function Agents() {
+  const [agents, setAgents]         = useState([]);
+  const [loading, setLoading]       = useState(true);
+  const [showInstall, setShowInstall] = useState(false);
+
+  // Use the actual origin so install commands work for both http and https
+  const serverUrl = window.location.origin;
+
+  const load = useCallback(async () => {
+    try {
+      const { data } = await axios.get('/api/agents');
+      setAgents(data.agents || []);
+    } catch (_) {}
+    setLoading(false);
+  }, []);
+
+  useEffect(() => {
+    load();
+    const t = setInterval(load, 30000);
+    return () => clearInterval(t);
+  }, [load]);
+
+  const deleteAgent = async (id) => {
+    try {
+      await axios.delete(`/api/agents/${id}`);
+      setAgents(prev => prev.filter(a => a.id !== id));
+    } catch (_) {}
+  };
+
+  const onlineCount = agents.filter(a => isOnline(a.last_seen_at)).length;
+
+  return (
+    <div className="container agents-page">
+
+      {/* ── Header ── */}
+      <div className="ag-header">
+        <div className="ag-header-left">
+          <h2 className="ag-page-title">Agents</h2>
+          {agents.length > 0 && (
+            <span className="ag-count-pill">
+              {onlineCount} / {agents.length} online
+            </span>
+          )}
+        </div>
+        <button
+          className={`ag-install-toggle${showInstall ? ' ag-install-toggle-active' : ''}`}
+          onClick={() => setShowInstall(v => !v)}
+        >
+          {showInstall ? '✕ Close' : '+ Add Agent'}
+        </button>
+      </div>
+
+      {/* ── Install panel ── */}
+      {showInstall && <InstallPanel serverUrl={serverUrl} />}
+
+      {/* ── Content ── */}
+      {loading ? (
+        <div className="ag-loading">Loading agents…</div>
+      ) : agents.length === 0 ? (
+        <div className="ag-empty">
+          <div className="ag-empty-icon">🖥</div>
+          <div className="ag-empty-title">No agents registered yet</div>
+          <div className="ag-empty-sub">
+            Click <strong>+ Add Agent</strong> above to get the install commands.
+          </div>
+        </div>
+      ) : (
+        <div className="ag-grid">
+          {agents.map(agent => (
+            <AgentCard key={agent.id} agent={agent} onDelete={deleteAgent} />
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}

client/src/App.js

@@ -10,6 +10,7 @@ import SLA from './SLA';
 import Status from './Status';
 import Observability from './Observability';
 import Notifications from './Notifications';
+import Agents from './Agents';
 
 function Navbar() {
   const [notificationsConfigured, setNotificationsConfigured] = useState(false);
@@ -43,6 +44,7 @@ function Navbar() {
             <Link to="/history" className="nav-link">History</Link>
             <Link to="/sla" className="nav-link">SLA</Link>
             <Link to="/observability" className="nav-link">Observability</Link>
+            <Link to="/agents" className="nav-link">Agents</Link>
             <Link to="/notifications" className="nav-link">Notifications</Link>
             <Link to="/status" className="nav-link" target="_blank" rel="noreferrer">Status</Link>
             <Link to="/settings" className="nav-link settings-link">
@@ -75,6 +77,7 @@ function App() {
           <Route path="/settings" element={<div className="container"><SettingsWizard /></div>} />
           <Route path="/status" element={<Status />} />
           <Route path="/observability" element={<Observability />} />
+          <Route path="/agents" element={<Agents />} />
           <Route path="/notifications" element={<Notifications />} />
         </Routes>
       </div>

server/database.js

@@ -330,6 +330,44 @@ try { db.prepare("ALTER TABLE resources ADD COLUMN last_heartbeat_at DATETIME").
 // Feature: status page per-resource visibility
 try { db.prepare("ALTER TABLE resources ADD COLUMN is_public INTEGER DEFAULT 1").run(); } catch(e) {}
 
+// Feature: Linux agent monitoring
+try {
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS agents (
+      id          INTEGER PRIMARY KEY AUTOINCREMENT,
+      name        TEXT    NOT NULL,
+      token       TEXT    NOT NULL UNIQUE,
+      hostname    TEXT,
+      ip_address  TEXT,
+      os_info     TEXT,
+      last_seen_at DATETIME,
+      created_at  DATETIME DEFAULT CURRENT_TIMESTAMP
+    );
+
+    CREATE TABLE IF NOT EXISTS agent_metrics (
+      id              INTEGER PRIMARY KEY AUTOINCREMENT,
+      agent_id        INTEGER NOT NULL,
+      cpu_percent     REAL,
+      mem_total       INTEGER,
+      mem_used        INTEGER,
+      mem_percent     REAL,
+      disk_data       TEXT,
+      load_1          REAL,
+      load_5          REAL,
+      load_15         REAL,
+      uptime_seconds  INTEGER,
+      process_count   INTEGER,
+      net_bytes_sent  INTEGER,
+      net_bytes_recv  INTEGER,
+      recorded_at     DATETIME DEFAULT CURRENT_TIMESTAMP,
+      FOREIGN KEY (agent_id) REFERENCES agents(id) ON DELETE CASCADE
+    );
+
+    CREATE INDEX IF NOT EXISTS idx_agents_token            ON agents(token);
+    CREATE INDEX IF NOT EXISTS idx_agent_metrics_agent_time ON agent_metrics(agent_id, recorded_at DESC);
+  `);
+} catch(e) {}
+
 // Helpful indexes for time-range queries
 db.exec(`
   CREATE INDEX IF NOT EXISTS idx_checks_resource_time ON checks(resource_id, checked_at DESC);

server/index.js

@@ -16,6 +16,27 @@ const metrics = require('./metrics');
 const { discoverNetwork, getLocalSubnets } = require('./networkDiscovery');
 const auditLog = require('./auditLog');
 
+// Initialize agent_commands table
+try {
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS agent_commands (
+      id          INTEGER PRIMARY KEY AUTOINCREMENT,
+      agent_id    INTEGER NOT NULL REFERENCES agents(id) ON DELETE CASCADE,
+      command     TEXT    NOT NULL,
+      status      TEXT    NOT NULL DEFAULT 'pending',
+      output      TEXT,
+      exit_code   INTEGER,
+      created_at  DATETIME DEFAULT CURRENT_TIMESTAMP,
+      started_at  DATETIME,
+      completed_at DATETIME
+    );
+    CREATE INDEX IF NOT EXISTS idx_agent_commands_agent ON agent_commands(agent_id, created_at DESC);
+    CREATE INDEX IF NOT EXISTS idx_agent_commands_status ON agent_commands(agent_id, status);
+  `);
+} catch (error) {
+  console.error('Error initializing agent_commands table:', error);
+}
+
 // Initialize notifications table if it doesn't exist
 try {
   db.exec(`
@@ -2168,6 +2189,348 @@ app.post('/api/resources/import', express.text({ type: 'text/csv' }), (req, res)
   }
 });
 
+// ===== Agent API =====
+
+// Serve the agent daemon script
+app.get('/api/agents/script', (req, res) => {
+  const fs = require('fs');
+  const scriptPath = path.join(__dirname, '../agent/skywatch-agent.sh');
+  if (fs.existsSync(scriptPath)) {
+    res.setHeader('Content-Type', 'text/x-sh');
+    res.setHeader('Content-Disposition', 'attachment; filename="skywatch-agent.sh"');
+    res.sendFile(scriptPath);
+  } else {
+    res.status(404).json({ error: 'Agent script not found on this server' });
+  }
+});
+
+// Serve the installer script
+app.get('/api/agents/installer', (req, res) => {
+  const fs = require('fs');
+  const installerPath = path.join(__dirname, '../agent/install-agent.sh');
+  if (fs.existsSync(installerPath)) {
+    res.setHeader('Content-Type', 'text/x-sh');
+    res.setHeader('Content-Disposition', 'attachment; filename="install-agent.sh"');
+    res.sendFile(installerPath);
+  } else {
+    res.status(404).json({ error: 'Installer script not found on this server' });
+  }
+});
+
+// macOS agent scripts
+app.get('/api/agents/script-macos', (req, res) => {
+  const fs = require('fs');
+  const p = path.join(__dirname, '../agent/skywatch-agent-macos.sh');
+  if (fs.existsSync(p)) {
+    res.setHeader('Content-Type', 'text/x-sh');
+    res.setHeader('Content-Disposition', 'attachment; filename="skywatch-agent-macos.sh"');
+    res.sendFile(p);
+  } else { res.status(404).json({ error: 'macOS agent script not found' }); }
+});
+
+app.get('/api/agents/installer-macos', (req, res) => {
+  const fs = require('fs');
+  const p = path.join(__dirname, '../agent/install-agent-macos.sh');
+  if (fs.existsSync(p)) {
+    res.setHeader('Content-Type', 'text/x-sh');
+    res.setHeader('Content-Disposition', 'attachment; filename="install-agent-macos.sh"');
+    res.sendFile(p);
+  } else { res.status(404).json({ error: 'macOS installer not found' }); }
+});
+
+// Windows agent scripts
+app.get('/api/agents/script-windows', (req, res) => {
+  const fs = require('fs');
+  const p = path.join(__dirname, '../agent/skywatch-agent-windows.ps1');
+  if (fs.existsSync(p)) {
+    res.setHeader('Content-Type', 'text/plain');
+    res.setHeader('Content-Disposition', 'attachment; filename="skywatch-agent-windows.ps1"');
+    res.sendFile(p);
+  } else { res.status(404).json({ error: 'Windows agent script not found' }); }
+});
+
+app.get('/api/agents/installer-windows', (req, res) => {
+  const fs = require('fs');
+  const p = path.join(__dirname, '../agent/install-agent-windows.ps1');
+  if (fs.existsSync(p)) {
+    res.setHeader('Content-Type', 'text/plain');
+    res.setHeader('Content-Disposition', 'attachment; filename="install-agent-windows.ps1"');
+    res.sendFile(p);
+  } else { res.status(404).json({ error: 'Windows installer not found' }); }
+});
+
+// Register a new Linux agent — returns a bearer token the agent uses for all future calls
+app.post('/api/agents/register', rateLimit(5), (req, res) => {
+  // Optional: if AGENT_REGISTRATION_KEY is set in env, require it as X-Registration-Key header
+  const requiredKey = process.env.AGENT_REGISTRATION_KEY;
+  if (requiredKey) {
+    const provided = req.headers['x-registration-key'] || '';
+    if (provided !== requiredKey) {
+      return res.status(403).json({ error: 'Invalid or missing registration key' });
+    }
+  }
+
+  const { name, hostname, ip_address, os_info } = req.body;
+  if (!name) return res.status(400).json({ error: 'Agent name is required' });
+
+  try {
+    const token = randomUUID();
+    const result = db.prepare(`
+      INSERT INTO agents (name, token, hostname, ip_address, os_info)
+      VALUES (?, ?, ?, ?, ?)
+    `).run(name, token, hostname || name, ip_address || null, os_info || null);
+
+    res.json({ id: result.lastInsertRowid, token, name });
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to register agent', details: err.message });
+  }
+});
+
+// Receive a metrics snapshot from an agent (authenticated by bearer token)
+app.post('/api/agents/report', rateLimit(120), (req, res) => {
+  const auth = req.headers.authorization || '';
+  const token = auth.startsWith('Bearer ') ? auth.slice(7) : auth;
+  if (!token) return res.status(401).json({ error: 'Authorization token required' });
+
+  const agent = db.prepare('SELECT id FROM agents WHERE token = ?').get(token);
+  if (!agent) return res.status(401).json({ error: 'Invalid token' });
+
+  const {
+    cpu_percent, mem_total, mem_used, mem_percent,
+    disk, load_1, load_5, load_15,
+    uptime_seconds, process_count, net_bytes_sent, net_bytes_recv, ip_address,
+  } = req.body;
+
+  try {
+    db.prepare(`
+      UPDATE agents SET last_seen_at = CURRENT_TIMESTAMP, ip_address = COALESCE(?, ip_address)
+      WHERE id = ?
+    `).run(ip_address || null, agent.id);
+
+    db.prepare(`
+      INSERT INTO agent_metrics
+        (agent_id, cpu_percent, mem_total, mem_used, mem_percent, disk_data,
+         load_1, load_5, load_15, uptime_seconds, process_count, net_bytes_sent, net_bytes_recv)
+      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+    `).run(
+      agent.id,
+      cpu_percent   ?? null,
+      mem_total     ?? null,
+      mem_used      ?? null,
+      mem_percent   ?? null,
+      disk ? JSON.stringify(disk) : null,
+      load_1        ?? null,
+      load_5        ?? null,
+      load_15       ?? null,
+      uptime_seconds ?? null,
+      process_count ?? null,
+      net_bytes_sent ?? null,
+      net_bytes_recv ?? null,
+    );
+
+    res.json({ ok: true });
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to store metrics' });
+  }
+});
+
+// List all agents with their most-recent metrics snapshot
+app.get('/api/agents', (req, res) => {
+  try {
+    const rows = db.prepare(`
+      SELECT
+        a.id, a.name, a.hostname, a.ip_address, a.os_info,
+        REPLACE(a.last_seen_at, ' ', 'T') || 'Z' AS last_seen_at,
+        REPLACE(a.created_at,   ' ', 'T') || 'Z' AS created_at,
+        m.cpu_percent, m.mem_total, m.mem_used, m.mem_percent,
+        m.disk_data, m.load_1, m.load_5, m.load_15,
+        m.uptime_seconds, m.process_count, m.net_bytes_sent, m.net_bytes_recv,
+        REPLACE(m.recorded_at, ' ', 'T') || 'Z' AS last_metric_at
+      FROM agents a
+      LEFT JOIN agent_metrics m ON m.id = (
+        SELECT id FROM agent_metrics WHERE agent_id = a.id ORDER BY recorded_at DESC LIMIT 1
+      )
+      ORDER BY a.name ASC
+    `).all();
+
+    const agents = rows.map(({ disk_data, ...a }) => ({
+      ...a,
+      disk: disk_data ? JSON.parse(disk_data) : null,
+    }));
+
+    res.json({ agents });
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to list agents' });
+  }
+});
+
+// Get a single agent with its latest metrics
+app.get('/api/agents/:id', (req, res) => {
+  try {
+    const agent = db.prepare(`
+      SELECT id, name, hostname, ip_address, os_info,
+        REPLACE(last_seen_at, ' ', 'T') || 'Z' AS last_seen_at,
+        REPLACE(created_at,   ' ', 'T') || 'Z' AS created_at
+      FROM agents WHERE id = ?
+    `).get(req.params.id);
+    if (!agent) return res.status(404).json({ error: 'Agent not found' });
+
+    const raw = db.prepare(
+      'SELECT * FROM agent_metrics WHERE agent_id = ? ORDER BY recorded_at DESC LIMIT 1'
+    ).get(agent.id);
+
+    const latest = raw
+      ? (() => { const { disk_data, ...r } = raw; return { ...r, disk: disk_data ? JSON.parse(disk_data) : null }; })()
+      : null;
+
+    res.json({ ...agent, latest });
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to get agent' });
+  }
+});
+
+// Historical metrics for an agent (default: last hour, up to 500 rows)
+app.get('/api/agents/:id/metrics', (req, res) => {
+  const { limit = 60, hours = 1 } = req.query;
+  try {
+    const agent = db.prepare('SELECT id FROM agents WHERE id = ?').get(req.params.id);
+    if (!agent) return res.status(404).json({ error: 'Agent not found' });
+
+    const rows = db.prepare(`
+      SELECT cpu_percent, mem_total, mem_used, mem_percent, disk_data,
+        load_1, load_5, load_15, uptime_seconds, process_count,
+        net_bytes_sent, net_bytes_recv,
+        REPLACE(recorded_at, ' ', 'T') || 'Z' AS recorded_at
+      FROM agent_metrics
+      WHERE agent_id = ? AND recorded_at > datetime('now', ?)
+      ORDER BY recorded_at ASC
+      LIMIT ?
+    `).all(req.params.id, `-${parseInt(hours)} hours`, Math.min(parseInt(limit), 500));
+
+    const metrics = rows.map(({ disk_data, ...r }) => ({
+      ...r,
+      disk: disk_data ? JSON.parse(disk_data) : null,
+    }));
+
+    res.json({ metrics });
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to get metrics' });
+  }
+});
+
+// Delete an agent and all its stored metrics
+app.delete('/api/agents/:id', (req, res) => {
+  try {
+    const result = db.prepare('DELETE FROM agents WHERE id = ?').run(req.params.id);
+    if (result.changes === 0) return res.status(404).json({ error: 'Agent not found' });
+    res.json({ message: 'Agent deleted' });
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to delete agent' });
+  }
+});
+
+// ── Agent command queue ────────────────────────────────────────────────────────
+
+// Dashboard → queue a command for a specific agent
+app.post('/api/agents/:id/commands', (req, res) => {
+  const agentId = parseInt(req.params.id, 10);
+  const { command } = req.body;
+  if (!command || typeof command !== 'string' || !command.trim()) {
+    return res.status(400).json({ error: 'command is required' });
+  }
+  const agent = db.prepare('SELECT id FROM agents WHERE id = ?').get(agentId);
+  if (!agent) return res.status(404).json({ error: 'Agent not found' });
+
+  try {
+    const result = db.prepare(
+      `INSERT INTO agent_commands (agent_id, command) VALUES (?, ?)`
+    ).run(agentId, command.trim());
+    res.json({ id: result.lastInsertRowid, status: 'pending' });
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to queue command' });
+  }
+});
+
+// Dashboard → get command history for an agent (last 50)
+app.get('/api/agents/:id/commands', (req, res) => {
+  const agentId = parseInt(req.params.id, 10);
+  try {
+    const cmds = db.prepare(`
+      SELECT id, command, status, output, exit_code,
+        REPLACE(created_at,   ' ', 'T') || 'Z' AS created_at,
+        REPLACE(started_at,   ' ', 'T') || 'Z' AS started_at,
+        REPLACE(completed_at, ' ', 'T') || 'Z' AS completed_at
+      FROM agent_commands
+      WHERE agent_id = ?
+      ORDER BY created_at DESC
+      LIMIT 50
+    `).all(agentId);
+    res.json({ commands: cmds });
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to fetch commands' });
+  }
+});
+
+// Agent → dequeue one pending command (marks it running; returns 204 if queue empty)
+app.get('/api/agents/commands/pending', (req, res) => {
+  const auth = req.headers.authorization || '';
+  const token = auth.startsWith('Bearer ') ? auth.slice(7) : auth;
+  if (!token) return res.status(401).json({ error: 'Authorization required' });
+
+  const agent = db.prepare('SELECT id FROM agents WHERE token = ?').get(token);
+  if (!agent) return res.status(401).json({ error: 'Invalid token' });
+
+  try {
+    const cmd = db.prepare(`
+      SELECT id, command FROM agent_commands
+      WHERE agent_id = ? AND status = 'pending'
+      ORDER BY created_at ASC
+      LIMIT 1
+    `).get(agent.id);
+
+    if (!cmd) return res.status(204).end();
+
+    db.prepare(
+      `UPDATE agent_commands SET status = 'running', started_at = CURRENT_TIMESTAMP WHERE id = ?`
+    ).run(cmd.id);
+
+    res.json({ id: cmd.id, command: cmd.command });
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to dequeue command' });
+  }
+});
+
+// Agent → post result for a completed command
+app.post('/api/agents/commands/:cmdId/result', (req, res) => {
+  const auth = req.headers.authorization || '';
+  const token = auth.startsWith('Bearer ') ? auth.slice(7) : auth;
+  if (!token) return res.status(401).json({ error: 'Authorization required' });
+
+  const agent = db.prepare('SELECT id FROM agents WHERE token = ?').get(token);
+  if (!agent) return res.status(401).json({ error: 'Invalid token' });
+
+  const cmdId = parseInt(req.params.cmdId, 10);
+  const cmd = db.prepare('SELECT id, agent_id FROM agent_commands WHERE id = ?').get(cmdId);
+  if (!cmd || cmd.agent_id !== agent.id) return res.status(404).json({ error: 'Command not found' });
+
+  const { output, exit_code } = req.body;
+  const status = (exit_code === 0 || exit_code === '0') ? 'completed' : 'failed';
+  // Cap output at 128 KB
+  const safeOutput = typeof output === 'string' ? output.slice(0, 131072) : '';
+
+  try {
+    db.prepare(`
+      UPDATE agent_commands
+      SET status = ?, output = ?, exit_code = ?, completed_at = CURRENT_TIMESTAMP
+      WHERE id = ?
+    `).run(status, safeOutput, parseInt(exit_code) ?? -1, cmdId);
+
+    res.json({ ok: true });
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to store result' });
+  }
+});
+
 // Serve React app with proper MIME types
 const mimeTypes = {
   '.js': 'application/javascript',

server/notificationService.js

@@ -446,6 +446,77 @@ class NotificationService {
     }
   }
 
+  async sendAgentAlert(agent, type, message) {
+    const isOffline = type === 'offline';
+    const isOnline  = type === 'online';
+    const emoji  = isOffline ? '🔴' : isOnline ? '🟢' : '⚠️';
+    const title  = isOffline ? `Agent Offline: ${agent.name}`
+                 : isOnline  ? `Agent Online: ${agent.name}`
+                 : `Agent Alert: ${agent.name}`;
+    const notifType = isOffline ? 'down' : isOnline ? 'up' : 'warning';
+
+    // In-app notification
+    try {
+      const db = require('./database');
+      const result = db.prepare(`
+        INSERT INTO notifications (resource_id, incident_id, type, title, message)
+        VALUES (NULL, NULL, ?, ?, ?)
+      `).run(notifType, title, message);
+      if (global.broadcastNotification) {
+        global.broadcastNotification({
+          id: result.lastInsertRowid, resource_id: null, resource_name: agent.name,
+          incident_id: null, type: notifType, title, message, read: 0,
+          created_at: new Date().toISOString(),
+        });
+      }
+    } catch (_) {}
+
+    // Email
+    if (this.emailEnabled && this.transporter && this.config.email_to) {
+      try {
+        await this.transporter.sendMail({
+          from: this.config.email_from,
+          to: this.config.email_to,
+          subject: `${emoji} SkyWatch Agent: ${title}`,
+          text: [
+            message,
+            '',
+            `Agent:    ${agent.name}`,
+            `Hostname: ${agent.hostname || '—'}`,
+            `IP:       ${agent.ip_address || '—'}`,
+            `OS:       ${agent.os_info || '—'}`,
+            `Time:     ${new Date().toLocaleString()}`,
+          ].join('\n'),
+        });
+      } catch (_) {}
+    }
+
+    // Webhook
+    if (this.webhookEnabled && this.config.webhook_url) {
+      try {
+        await axios.post(this.config.webhook_url, {
+          type: 'agent', event: type,
+          agent: { id: agent.id, name: agent.name, hostname: agent.hostname, ip_address: agent.ip_address },
+          title, message, timestamp: new Date().toISOString(),
+        });
+      } catch (_) {}
+    }
+
+    // Ntfy
+    if (this.ntfyEnabled && this.config.ntfy_topic) {
+      const ntfyBase = (this.config.ntfy_url || 'https://ntfy.sh').replace(/\/$/, '');
+      try {
+        await axios.post(`${ntfyBase}/`, {
+          topic: this.config.ntfy_topic,
+          title: `${emoji} ${title}`,
+          message,
+          priority: isOffline ? 4 : isOnline ? 2 : 3,
+          tags: isOffline ? ['red_circle'] : isOnline ? ['green_circle'] : ['warning'],
+        });
+      } catch (_) {}
+    }
+  }
+
   async sendNtfy(resource, type) {
     const ntfyUrl = this.config.ntfy_url || 'https://ntfy.sh';
     const ntfyTopic = this.config.ntfy_topic;

server/scheduler.js

@@ -3,13 +3,21 @@ const db = require('./database');
 const monitorService = require('./monitorService');
 const notificationService = require('./notificationService');
 
+const AGENT_CPU_THRESHOLD  = 90;
+const AGENT_MEM_THRESHOLD  = 90;
+const AGENT_DISK_THRESHOLD = 90;
+const AGENT_OFFLINE_MS     = 3 * 60 * 1000; // matches UI isOnline() check
+
 class Scheduler {
   constructor() {
     this.jobs = new Map();
     this.isRunning = false;
     this.lastCheckedAt = new Map();
     this.slowAlertCooldown = new Map();
-    this.slowConsecutiveCount = new Map(); // tracks consecutive slow checks per resource
+    this.slowConsecutiveCount = new Map();
+    // Agent health tracking — keyed by agent id
+    this.agentOnlineState = new Map(); // id -> boolean
+    this.agentAlertState  = new Map(); // id -> { cpu, mem, disk }
   }
 
   start() {
@@ -25,6 +33,11 @@ class Scheduler {
       }
     });
 
+    // Agent health check every 2 minutes
+    cron.schedule('*/2 * * * *', async () => {
+      await this.checkAgents();
+    });
+
     // Archive old checks + update baselines + check escalations daily at 2 AM
     cron.schedule('0 2 * * *', () => {
       this.archiveOldChecks();
@@ -43,6 +56,111 @@ class Scheduler {
     }, 5000);
   }
 
+  async checkAgents() {
+    try {
+      const rows = db.prepare(`
+        SELECT
+          a.id, a.name, a.hostname, a.ip_address, a.os_info, a.last_seen_at,
+          m.cpu_percent, m.mem_percent, m.disk_data
+        FROM agents a
+        LEFT JOIN agent_metrics m ON m.id = (
+          SELECT id FROM agent_metrics WHERE agent_id = a.id ORDER BY recorded_at DESC LIMIT 1
+        )
+        ORDER BY a.id
+      `).all();
+
+      const liveIds = new Set();
+
+      for (const agent of rows) {
+        liveIds.add(agent.id);
+
+        const isOnline = agent.last_seen_at
+          ? Date.now() - new Date(agent.last_seen_at).getTime() < AGENT_OFFLINE_MS
+          : false;
+
+        const wasOnline = this.agentOnlineState.get(agent.id);
+
+        if (wasOnline === undefined) {
+          // First poll — seed state without alerting
+          this.agentOnlineState.set(agent.id, isOnline);
+          this.agentAlertState.set(agent.id, { cpu: false, mem: false, disk: false });
+          continue;
+        }
+
+        // Online/offline transitions
+        if (wasOnline && !isOnline) {
+          await notificationService.sendAgentAlert(
+            agent, 'offline',
+            `Agent "${agent.name}" (${agent.hostname || agent.ip_address || 'unknown'}) has gone offline.`
+          );
+        } else if (!wasOnline && isOnline) {
+          await notificationService.sendAgentAlert(
+            agent, 'online',
+            `Agent "${agent.name}" (${agent.hostname || agent.ip_address || 'unknown'}) is back online.`
+          );
+          this.agentAlertState.set(agent.id, { cpu: false, mem: false, disk: false });
+        }
+
+        this.agentOnlineState.set(agent.id, isOnline);
+
+        if (!isOnline || agent.cpu_percent == null) continue;
+
+        const as = this.agentAlertState.get(agent.id) || { cpu: false, mem: false, disk: false };
+
+        // CPU
+        if (agent.cpu_percent > AGENT_CPU_THRESHOLD && !as.cpu) {
+          await notificationService.sendAgentAlert(
+            agent, 'cpu',
+            `Agent "${agent.name}" CPU is at ${Number(agent.cpu_percent).toFixed(1)}% (threshold: ${AGENT_CPU_THRESHOLD}%).`
+          );
+          as.cpu = true;
+        } else if (agent.cpu_percent <= AGENT_CPU_THRESHOLD) {
+          as.cpu = false;
+        }
+
+        // Memory
+        if (agent.mem_percent > AGENT_MEM_THRESHOLD && !as.mem) {
+          await notificationService.sendAgentAlert(
+            agent, 'memory',
+            `Agent "${agent.name}" memory is at ${Number(agent.mem_percent).toFixed(1)}% (threshold: ${AGENT_MEM_THRESHOLD}%).`
+          );
+          as.mem = true;
+        } else if (agent.mem_percent <= AGENT_MEM_THRESHOLD) {
+          as.mem = false;
+        }
+
+        // Disk — check all partitions
+        if (agent.disk_data) {
+          try {
+            const disks = JSON.parse(agent.disk_data);
+            const worst = disks.reduce((m, d) => (d.percent > (m?.percent ?? 0) ? d : m), null);
+            if (worst && worst.percent > AGENT_DISK_THRESHOLD && !as.disk) {
+              await notificationService.sendAgentAlert(
+                agent, 'disk',
+                `Agent "${agent.name}" disk ${worst.path} is at ${worst.percent}% (threshold: ${AGENT_DISK_THRESHOLD}%).`
+              );
+              as.disk = true;
+            } else if (!worst || worst.percent <= AGENT_DISK_THRESHOLD) {
+              as.disk = false;
+            }
+          } catch (_) {}
+        }
+
+        this.agentAlertState.set(agent.id, as);
+      }
+
+      // Remove state for deleted agents
+      for (const id of this.agentOnlineState.keys()) {
+        if (!liveIds.has(id)) {
+          this.agentOnlineState.delete(id);
+          this.agentAlertState.delete(id);
+        }
+      }
+    } catch (err) {
+      console.error('Agent health check error:', err.message);
+    }
+  }
+
   archiveOldChecks() {
     try {
       const retentionSetting = db.prepare(`SELECT value FROM settings WHERE key = 'retention_days'`).get();

update-server.sh

@@ -1,52 +1,32 @@
 #!/bin/bash
-# Quick update script for SkyWatch on remote server
+# SkyWatch update script — run on the server to pull and deploy the latest version.
-# Run this on the server: bash update-server.sh
+# The React client is built locally and committed to git before running this.
-
+# Usage: bash update-server.sh
 set -e
 
-echo "🔄 Updating SkyWatch..."
+APP_DIR="/opt/resource-monitor"
 
-cd /opt/resource-monitor
+echo "==> Updating SkyWatch at ${APP_DIR} ..."
+cd "$APP_DIR"
 
-echo "📥 Pulling latest code..."
+echo "==> Pulling latest code (includes pre-built client) ..."
 git pull origin main
 
-echo "🔧 Ensuring build tools are present (needed for native modules)..."
+echo "==> Installing/updating server dependencies ..."
-if command -v apt-get &>/dev/null; then
+npm install --omit=dev 2>&1 | tail -20
-	apt-get install -y --no-install-recommends make gcc g++ python3 2>&1 | tail -5
-elif command -v dnf &>/dev/null; then
-	dnf install -y make gcc gcc-c++ python3 2>&1 | tail -5
-elif command -v yum &>/dev/null; then
-	yum install -y make gcc gcc-c++ python3 2>&1 | tail -5
-fi
 
-echo "📦 Installing dependencies..."
+echo "==> Restarting application via PM2 ..."
-rm -rf node_modules
-
-# Prefer deterministic installs with npm ci when lockfile is present.
-if [ -f package-lock.json ]; then
-	if ! npm ci --omit=dev 2>&1 | tail -20; then
-		echo "npm ci failed, falling back to npm install..."
-		npm install --omit=dev 2>&1 | tail -20
-	fi
-else
-	echo "No package-lock.json found, using npm install..."
-	npm install --omit=dev 2>&1 | tail -20
-fi
-
-echo "🔄 Restarting application..."
 pm2 restart resource-monitor
 
-echo "✅ Waiting for startup..."
+echo "==> Waiting for startup ..."
-sleep 3
+sleep 4
 
-echo "📋 Checking status..."
+echo "==> Status:"
 pm2 status resource-monitor
 
 echo ""
-echo "📊 Recent logs (checking for database migration):"
+echo "==> Health check:"
-pm2 logs resource-monitor --lines 30 --nostream
+curl -s http://localhost:3001/api/health | grep -o '"status":"[^"]*"' || echo "(no response yet)"
 
 echo ""
 echo "✅ Update complete!"
-echo "🌐 Check your dashboard at http://$(hostname -I | awk '{print $1}'):3001"