Debug and Troubleshoot

console.log('modelContext:', typeof document.modelContext);
console.log('modelContextTesting:', typeof navigator.modelContextTesting);

const tools = await navigator.modelContextTesting.listTools();
console.log(
  'Registered tools:',
  tools.map((t) => t.name)
);

const result = await navigator.modelContextTesting.executeTool('my_tool', '{"query": "test"}');
console.log('Result:', result);

Use the debug-webmcp prompt with url=http://localhost:3000

if (!document.modelContext) {
  console.log('No modelContext — polyfill not loaded');
} else if (navigator.modelContextTesting?.constructor.name.includes('WebModelContext')) {
  console.log('Polyfill detected');
} else {
  console.log('Native API');
}

google-chrome --enable-experimental-web-platform-features http://localhost:3000

// Wrong — missing type
inputSchema: {
  properties: { query: { type: 'string' } }
}

// Correct
inputSchema: {
  type: 'object',
  properties: { query: { type: 'string' } },
  required: ['query']
}