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57 lines
2.4 KiB
Markdown
57 lines
2.4 KiB
Markdown
# Example: System Monitor App
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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.
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<table>
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<tr>
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<td><a href="https://modelcontextprotocol.github.io/ext-apps/screenshots/system-monitor-server/01-initial-state.png"><img src="https://modelcontextprotocol.github.io/ext-apps/screenshots/system-monitor-server/01-initial-state.png" alt="Initial state" width="100%"></a></td>
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<td><a href="https://modelcontextprotocol.github.io/ext-apps/screenshots/system-monitor-server/02-cpu-data-accumulated.png"><img src="https://modelcontextprotocol.github.io/ext-apps/screenshots/system-monitor-server/02-cpu-data-accumulated.png" alt="CPU data accumulated" width="100%"></a></td>
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<td><a href="https://modelcontextprotocol.github.io/ext-apps/screenshots/system-monitor-server/03-extended-cpu-history.png"><img src="https://modelcontextprotocol.github.io/ext-apps/screenshots/system-monitor-server/03-extended-cpu-history.png" alt="Extended CPU history" width="100%"></a></td>
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</tr>
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</table>
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## Features
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- **Per-Core CPU Monitoring**: Stacked area chart showing individual CPU core utilization over a 1-minute sliding window
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- **Memory Usage**: Horizontal bar gauge with color-coded thresholds (green/yellow/red)
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- **System Info**: Hostname, platform, and uptime display
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- **Auto-Polling**: Automatically starts monitoring on load with 2-second refresh interval
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- **Theme Support**: Adapts to light/dark mode preferences
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## Running
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1. Install dependencies:
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```bash
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npm install
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```
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2. Build and start the server:
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```bash
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npm start
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```
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The server will listen on `http://localhost:3001/mcp`.
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3. View using the [`basic-host`](https://github.com/modelcontextprotocol/ext-apps/tree/main/examples/basic-host) example or another MCP Apps-compatible host.
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## Architecture
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### Server (`server.ts`)
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Exposes a single `get-system-stats` tool that returns:
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- Raw per-core CPU timing data (idle/total counters)
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- Memory usage (used/total/percentage)
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- System info (hostname, platform, uptime)
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The tool is linked to a UI resource via `_meta[RESOURCE_URI_META_KEY]`.
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### App (`src/mcp-app.ts`)
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- Uses Chart.js for the stacked area chart visualization
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- Polls the server tool every 2 seconds
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- Computes CPU usage percentages client-side from timing deltas
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- Maintains a 30-point history (1 minute at 2s intervals)
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- Updates all UI elements on each poll
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