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Olivier Chafik ae9b96e1fd chore: bump to 1.0.1 - fix npm reference for ext-apps dependency in examples + update zod to 4.x (#368 ) * fix(examples): use npm reference for ext-apps dependency Replace local path '../..' with '^1.0.0' npm reference in all example packages. The local path was accidentally published to npm, causing npm install to hang when installing server-* packages. Bump versions to 1.0.1 for all public packages to fix the published versions. Fixes npm install hanging issue in dependent projects like example-remote-server. Note: npm workspaces automatically resolves the dependency to the local package during development, so no overrides are needed. * fix: update zod to 4.x in transcript-server and fix update-lock:docker script - Update transcript-server to use zod ^4.1.13 for compatibility - Fix update-lock:docker script to properly clean workspace node_modules - Regenerate package-lock.json with clean npmjs.org URLs		2026-01-26 21:55:15 +00:00
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src	Improve consistency and organization of examples for AI learning	2026-01-13 20:48:02 -06:00
.gitignore	Improve consistency and organization of examples for AI learning	2026-01-13 20:48:02 -06:00
grid-cell.png	feat(basic-host): URL params, fullscreen mode, unified layout (#266 )	2026-01-14 22:09:41 +00:00
main.ts	Refactor server startup functions	2026-01-24 09:27:54 -06:00
mcp-app.html	Add color-scheme meta tag to all example apps	2025-12-15 11:42:18 -08:00
package.json	chore: bump to 1.0.1 - fix npm reference for ext-apps dependency in examples + update zod to 4.x (#368 )	2026-01-26 21:55:15 +00:00
README.md	chore: stable spec release 2026-01-26 and SDK v1.0.0 (#362 )	2026-01-26 17:31:33 +00:00
screenshot.png	feat(basic-host): URL params, fullscreen mode, unified layout (#266 )	2026-01-14 22:09:41 +00:00
server.ts	fix(examples): resolve DIST_DIR path for npm package execution (#277 )	2026-01-15 12:23:13 +00:00
tsconfig.json	Add system-monitor-server example	2025-12-04 14:32:41 -06:00
tsconfig.server.json	feat: compile example servers to JavaScript for npm consumption (#259 )	2026-01-14 23:46:17 +00:00
vite.config.ts	Add system-monitor-server example	2025-12-04 14:32:41 -06:00

README.md

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.

MCP Client Configuration

Add to your MCP client configuration (stdio transport):

{
  "mcpServers": {
    "system-monitor": {
      "command": "npx",
      "args": [
        "-y",
        "--silent",
        "--registry=https://registry.npmjs.org/",
        "@modelcontextprotocol/server-system-monitor",
        "--stdio"
      ]
    }
  }
}

Local Development

To test local modifications, use this configuration (replace ~/code/ext-apps with your clone path):

{
  "mcpServers": {
    "system-monitor": {
      "command": "bash",
      "args": [
        "-c",
        "cd ~/code/ext-apps/examples/system-monitor-server && npm run build >&2 && node dist/index.js --stdio"
      ]
    }
  }
}

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 run start:http  # for Streamable HTTP transport
# OR
npm run start:stdio  # for stdio transport

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.ui.resourceUri.

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