Hooks

Where it lives

• hooks/print-prompt.jsGitHub ↗
  Read the script

  const path = require('path');
  const fs = require('fs');
  
  const text = fs.readFileSync(path.join(__dirname, 'system-prompt.md'), 'utf8');
  
  // Copilot CLI (v1.0.11+) injects additionalContext from JSON output.
  // Claude Code captures raw stdout as context.
  // Detect runtime and output the appropriate format.
  if (process.env.COPILOT_CLI) {
    process.stdout.write(JSON.stringify({ additionalContext: text }));
  } else {
    process.stdout.write(text);
  }
  

• hooks/setup.jsGitHub ↗
  Read the script

  const fs = require('fs');
  const cp = require('child_process');
  const p = require('path');
  const os = require('os');
  
  // __dirname is the hooks/ directory; the plugin root is one level up
  const r = p.resolve(__dirname, '..');
  const d = process.env.CLAUDE_PLUGIN_DATA || process.env.COPILOT_PLUGIN_DATA;
  const e = process.env.CLAUDE_ENV_FILE;
  
  if (!r || !d) {
    process.exit(0);
  }
  
  const src = p.join(r, 'scripts', 'native-deps.json');
  const dst = p.join(d, 'package.json');
  
  try {
    if (fs.readFileSync(src, 'utf8') !== fs.readFileSync(dst, 'utf8')) throw 0;
  } catch {
    fs.mkdirSync(d, { recursive: true });
    fs.copyFileSync(src, dst);
    cp.execSync('npm install --no-audit --no-fund', { cwd: d, stdio: 'inherit' });
  }
  
  var pd = p.join(os.homedir(), '.copilot-studio-cli');
  fs.mkdirSync(pd, { recursive: true });
  fs.writeFileSync(
    p.join(pd, 'plugin-paths.json'),
    JSON.stringify({ pluginData: d, pluginRoot: r })
  );
  
  if (e) {
    fs.appendFileSync(
      e,
      'export CLAUDE_PLUGIN_DATA="' + d + '"\nexport CLAUDE_PLUGIN_ROOT="' + r + '"\n'
    );
  }
  

Read the script before you install anything that runs on your machine. This is the one part of a plugin that acts without being asked.