WebMCP Validator — 2-UA

Annotate existing forms with WebMCP attributes. The browser auto-generates JSON Schema from the form fields.

<form toolname="search_products"
      tooldescription="Search catalog by keyword">
  <input type="text" name="query" required
         toolparamdescription="Search terms">
  <button type="submit">Search</button>
</form>

Add toolautosubmit for read-only actions (search, filters). Omit it for write actions to require human review.

Register tools programmatically for complex multi-step flows.

if ("modelContext" in navigator) {
  navigator.modelContext.registerTool({
    name: "add_to_cart",
    description: "Add a product to cart",
    inputSchema: {
      type: "object",
      properties: {
        product_id: { type: "string" }
      },
      required: ["product_id"]
    },
    execute: async ({ product_id }) => {
      await cart.add(product_id);
      return { content: [{ type: "text",
        text: "Added to cart" }] };
    }
  });
}

{
  "mcp_version": "2025-11-25",
  "endpoints": [{
    "url": "https://example.com/mcp",
    "transport": "streamable-http",
    "capabilities": ["tools","resources"]
  }]
}

{
  "protocolVersion": "2025-11-25",
  "serverInfo": {
    "name": "My MCP Server",
    "version": "1.0.0"
  },
  "transport": {
    "type": "streamable-http",
    "url": "https://example.com/mcp"
  },
  "capabilities": {
    "tools": true, "resources": false
  }
}