Add tools to an existing app

pnpm add @mcp-b/global

import '@mcp-b/global';

const controller = new AbortController();

await document.modelContext.registerTool(
  {
    name: 'add-to-cart',
    description: 'Add a product to the shopping cart',
    inputSchema: {
      type: 'object',
      properties: {
        productId: { type: 'string' },
        quantity: { type: 'integer' },
      },
      required: ['productId'],
    },
    async execute(args) {
      const item = await addToCart(args.productId, args.quantity ?? 1);
      return {
        content: [{ type: 'text', text: `Added ${item.name} to cart` }],
      };
    },
  },
  { signal: controller.signal }
);

export function removeCartTool() {
  controller.abort();
}

const tools = await document.modelContext.getTools();
console.table(tools.map(({ name, description }) => ({ name, description })));