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Jonathan Hefner fa2d413f1d Add system-monitor-server example

Demo MCP App showcasing real-time OS metrics visualization with:
- Per-core CPU usage via stacked area chart (Chart.js)
- Memory usage bar gauge with color-coded thresholds
- Auto-polling at 2-second intervals
- Light/dark theme support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

2025-12-04 14:32:41 -06:00

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Example: System Monitor App

A demo MCP App that displays real-time OS metrics with a stacked area chart for per-core CPU usage and a bar gauge for memory.

Features

Per-Core CPU Monitoring: Stacked area chart showing individual CPU core utilization over a 1-minute sliding window
Memory Usage: Horizontal bar gauge with color-coded thresholds (green/yellow/red)
System Info: Hostname, platform, and uptime display
Auto-Polling: Automatically starts monitoring on load with 2-second refresh interval
Theme Support: Adapts to light/dark mode preferences

Running

Install dependencies:
```
npm install
```
Build and start the server:
```
npm start
```
The server will listen on http://localhost:3001/mcp.
View using the basic-host example or another MCP Apps-compatible host.

Architecture

Server (`server.ts`)

Exposes a single get-system-stats tool that returns:

Raw per-core CPU timing data (idle/total counters)
Memory usage (used/total/percentage)
System info (hostname, platform, uptime)

The tool is linked to a UI resource via _meta[RESOURCE_URI_META_KEY].

App (`src/mcp-app.ts`)

Uses Chart.js for the stacked area chart visualization
Polls the server tool every 2 seconds
Computes CPU usage percentages client-side from timing deltas
Maintains a 30-point history (1 minute at 2s intervals)
Updates all UI elements on each poll

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