Step-by-Step Guide: Implementing webMCP on Your Website

🤔 What is webMCP?
webMCP (Web Machine Context & Procedure) is a new way to describe the actions and flows on your web pages in a small JSON block. Instead of AI agents “guessing” your UI by scraping, they can read your declared intents, inputs, selectors, and outcomes directly — making your site faster, more reliable, and ready for the emerging “agentic web.”

⚡ Why It Matters

• 💡 Agents complete tasks on your site without brittle scraping.
• ⚡ Faster automations and lower AI costs.
• 🛡️ Safer because you control what’s exposed.
• 🔗 Works alongside MCP (Model Context Protocol) for secure, server-side tools.

🧰 Prerequisites

• You can edit your theme/templates (WordPress, Laravel, Next.js, etc.).
• You can add a on a page with a form (like “Contact”), add a block like this:

  This declares a safe intent (fill and submit your form) and how to detect success or errors.

  ---

  🗺️ Step 2 — Expose Discoverability with llms.txt

  At https://example.com/llms.txt put:

  # Where to find AI-facing metadata
  MCP: /mcp/manifest.json
  webMCP: /webmcp/site.json
  SITEMAP: /sitemap.xml
  

  This is a simple “directory” for AI systems. The webMCP line points to your site-level index (next step).

  ---

  🌐 Step 3 — Add a Site-Level webMCP Index

  Create /webmcp/site.json with page and flow info:

  {
    "spec": "webmcp/0.1",
    "site": {
      "name": "RightWebHost",
      "version": "2025.09",
      "pages": [
        {"url": "https://example.com/", "intents": ["search_docs"]},
        {"url": "https://example.com/contact", "intents": ["submit_contact_form"]},
        {"url": "https://example.com/insights/subscribe", "intents": ["subscribe_newsletter"]}
      ],
      "flows": [
        {
          "id": "newsletter_signup",
          "steps": [
            {"intent": "subscribe_newsletter", "page": "https://example.com/insights/subscribe"},
            {"intent": "confirm_optin", "page": "https://example.com/thanks"}
          ]
        }
      ]
    }
  }
  

  Now an agent can plan across pages without guessing navigation.

  ---

  🔐 Step 4 — (Optional) Add an MCP Server for Secure Tools

  If you need back-end access (like creating a support ticket or fetching invoices), expose an MCP manifest at /mcp/manifest.json and require OAuth scopes for security.

  ---

  🧪 Step 5 — Validate Selectors & UX Cues

  • Use stable selectors (e.g., data-testid) so style changes don’t break automations.
  • Ensure success/error elements exist after submission.
  • Match your policy.rateLimit server-side.

  ---

  🔒 Step 6 — Privacy & Safety Controls

  • Start with low-risk intents (newsletter, search, contact).
  • Never put secrets in webMCP JSON.
  • Log agent actions and cap frequency.

  ---

  🧭 Step 7 — Test with an Agent-Aware Browser

  Check that the agent:

  • Reads llms.txt and finds your manifests.
  • Completes the intent end-to-end.
  • Detects outcomes correctly and respects rate limits.

  ---

  📝 Production Checklist

  ☑ llms.txt points to /webmcp/site.json and (optionally) /mcp/manifest.json
  ☑ Page-level

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