rebodyhealth.com

Your robots.txt has no Content-Signal directive. Content Signals (contentsignals.org) is a robots.txt extension that states, separately, whether your content may be used for search, as real-time AI input (which is what shopping agents do), and for training. An explicit signal scores fully; silence scores half.

You can welcome shopping agents while still declining training. Add to the * group (or to each group you care about):

User-agent: *
Content-Signal: search=yes, ai-input=yes, ai-train=no
Allow: /

Keep ai-input=yes; set ai-train however you like. If Cloudflare manages your robots.txt, the equivalent setting lives in AI Crawl Control → Content Signals.

Edit the robots.txt served from your web root (or the CDN/edge rule that generates it) and redeploy. Crawlers cache robots.txt for up to 24 hours, so re-scan after a day.

Nothing usable was found at /.well-known/http-message-signatures-directory (HTTP 404). Web Bot Auth is the IETF draft that lets agents sign requests with HTTP Message Signatures; parties that sign publish their Ed25519 public keys in this directory, and verifiers fetch it to check the Signature and Signature-Input headers. Visa's Trusted Agent Protocol, Mastercard's Agent Pay, and Cloudflare's signed-agent verification are all built on it.

Two steps matter for a storefront:

• Verify signatures at your edge so signed agents are let through bot management instead of challenged. On Cloudflare this is the Verified Bots / signed agents setting; other WAFs are adding the same.
• Publish your own directory for any requests you sign (your own agent, service-to-service calls, or a verifier that expects one to exist). Serve it with Content-Type: application/http-message-signatures-directory+json:

{
  "keys": [
    {
      "kty": "OKP",
      "crv": "Ed25519",
      "kid": "2026-01",
      "x": "<base64url-encoded public key>",
      "nbf": 1767225600,
      "exp": 1798761600
    }
  ]
}

Serve the file from the same origin as the storefront, with a long cache lifetime, and rotate keys by adding the new one before removing the old.

Your Offer is missing shippingDetails and priceValidUntil. Agents rank options by delivery time, delivery cost, return risk, and how confident they are in the price; these three fields are where they look.

Add to the offers object:

"priceValidUntil": "2026-12-31",
"shippingDetails": {
  "@type": "OfferShippingDetails",
  "shippingRate": { "@type": "MonetaryAmount", "value": "0", "currency": "USD" },
  "shippingDestination": { "@type": "DefinedRegion", "addressCountry": "US" },
  "deliveryTime": {
    "@type": "ShippingDeliveryTime",
    "handlingTime": { "@type": "QuantitativeValue", "minValue": 0, "maxValue": 1, "unitCode": "DAY" },
    "transitTime": { "@type": "QuantitativeValue", "minValue": 2, "maxValue": 5, "unitCode": "DAY" }
  }
},
"hasMerchantReturnPolicy": {
  "@type": "MerchantReturnPolicy",
  "applicableCountry": "US",
  "returnPolicyCategory": "https://schema.org/MerchantReturnFiniteReturnWindow",
  "merchantReturnDays": 30,
  "returnMethod": "https://schema.org/ReturnByMail",
  "returnFees": "https://schema.org/FreeReturn"
}

Use your real values; one representative shipping rate and destination is enough. Set priceValidUntil to a date you can honour (the end of the current season or year, regenerated as it passes).

Many stores define the return policy once at the Organization level and reference it from each Offer; either is fine as long as the Offer on the product page carries or links to it.

Requesting https://rebodyhealth.com/p/sermorelin with Accept: text/markdown returned HTML. Agents that support content negotiation get a page that is a tenth of the size and needs no parsing. This is worth one point and is a nice-to-have.

When the Accept header prefers text/markdown, respond with a Markdown body and Vary: Accept:

GET /products/trail-runner-2 HTTP/1.1
Accept: text/markdown

HTTP/1.1 200 OK
Content-Type: text/markdown; charset=utf-8
Vary: Accept

# Trail Runner 2
**$129.00** · In stock · SKU TR2-BLK-10

Lightweight waterproof trail shoe. Sizes 6–13. Free shipping over $75, 30-day returns.

The simplest place to do this is edge middleware (a Cloudflare Worker, Vercel or Netlify middleware, or a Next.js route) that converts the rendered HTML or renders a dedicated template. If you are on Cloudflare, the "Markdown for Agents" option in AI Crawl Control does the conversion for you.

Your /.well-known/ucp profile declares the services dev.ucp.shopping and no capabilities. It has a shopping service but no checkout capability, so agents can browse but not buy.

A complete profile declares a shopping service with an endpoint and a checkout capability:

{
  "ucp": {
    "version": "2026-01-11",
    "services": {
      "dev.ucp.shopping": {
        "version": "2026-01-11",
        "spec": "https://ucp.dev/specification/overview",
        "rest": {
          "schema": "https://ucp.dev/services/shopping/openapi.json",
          "endpoint": "https://www.example.com/api/ucp"
        },
        "mcp": {
          "schema": "https://ucp.dev/services/shopping/mcp.json",
          "endpoint": "https://www.example.com/api/ucp/mcp"
        }
      }
    },
    "capabilities": [
      {
        "name": "dev.ucp.shopping.checkout",
        "version": "2026-01-11",
        "spec": "https://ucp.dev/specification/checkout",
        "schema": "https://ucp.dev/schemas/shopping/checkout.json"
      },
      {
        "name": "dev.ucp.shopping.order",
        "version": "2026-01-11",
        "spec": "https://ucp.dev/specification/order",
        "schema": "https://ucp.dev/schemas/shopping/order.json"
      }
    ],
    "payment_handlers": []
  }
}

Serve it as application/json from the storefront origin. The endpoints must exist and speak the protocol; the MCP one is tested by the next check. Check ucp.dev for the current version string and schema URLs.

Serve the profile from the storefront origin and implement the shopping service behind it; most of the work is the checkout capability, which maps onto your existing cart and checkout APIs.

https://rebodyhealth.com/api/ucp/mcp did not return a tool list (HTTP 404). The endpoint must speak MCP over Streamable HTTP: accept a JSON-RPC POST and answer with JSON or an SSE stream.

Test it the way we do:

curl -sS -X POST https://rebodyhealth.com/api/ucp/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}'

• tools/list must work without authentication; require auth on the tool calls that need it, and advertise it through OAuth discovery (see that fix).
• Return 200 with Content-Type: application/json (or text/event-stream), never a 405 for POST or an HTML page.
• Make sure the URL in the UCP profile (services → dev.ucp.shopping → mcp.endpoint) points at this endpoint exactly.

Any MCP server SDK (TypeScript, Python, Go) with the Streamable HTTP transport will do; mount it on the storefront origin so the profile, the endpoint, and the cookies share a domain.

Nothing was found at /.well-known/mcp/server-card.json. The server card is the MCP discovery document that lets an agent find your server, its transport endpoint, and how to authenticate, without reading documentation.

Publish a JSON document describing the server (field names follow the current MCP server-card draft; adjust to the version you target):

{
  "serverInfo": { "name": "example-storefront", "title": "Example Storefront", "version": "1.0.0" },
  "description": "Search the Example catalog, read policies, and manage a cart.",
  "transport": { "type": "streamable-http", "endpoint": "https://www.example.com/api/mcp" },
  "capabilities": { "tools": {} },
  "authentication": { "required": false }
}

Serve it as application/json with CORS enabled, and keep the endpoint in sync with the one your UCP profile names.

No API catalog was found. RFC 9727 defines /.well-known/api-catalog, a linkset that points agents at your APIs and their descriptions (OpenAPI, MCP, UCP) in one place.

Serve this as application/linkset+json:

{
  "linkset": [
    {
      "anchor": "https://www.example.com/",
      "service-desc": [
        { "href": "https://www.example.com/api/openapi.json", "type": "application/vnd.oai.openapi+json" }
      ],
      "service-doc": [
        { "href": "https://www.example.com/developers", "type": "text/html" }
      ],
      "service-meta": [
        { "href": "https://www.example.com/.well-known/ucp", "type": "application/json" },
        { "href": "https://www.example.com/.well-known/mcp/server-card.json", "type": "application/json" }
      ]
    }
  ]
}

Also advertise it from the homepage with a Link header, which we accept on its own:

Link: </.well-known/api-catalog>; rel="api-catalog"

None of /.well-known/oauth-authorization-server, /.well-known/openid-configuration, and /.well-known/oauth-protected-resource returned a JSON document. Agents that need to act on a customer's account (order status, saved addresses, loyalty) look for OAuth 2.0 discovery before they will attempt authenticated calls; it is also what MCP clients use to authorise against your MCP server.

If you run an authorization server on this origin, publish RFC 8414 metadata at /.well-known/oauth-authorization-server:

{
  "issuer": "https://www.example.com",
  "authorization_endpoint": "https://www.example.com/oauth/authorize",
  "token_endpoint": "https://www.example.com/oauth/token",
  "registration_endpoint": "https://www.example.com/oauth/register",
  "scopes_supported": ["cart:write", "orders:read"],
  "response_types_supported": ["code"],
  "grant_types_supported": ["authorization_code", "refresh_token"],
  "code_challenge_methods_supported": ["S256"]
}

If authentication is handled by a separate identity provider, publish RFC 9728 protected-resource metadata at /.well-known/oauth-protected-resource pointing at it:

{
  "resource": "https://www.example.com/api/mcp",
  "authorization_servers": ["https://auth.example.com"],
  "scopes_supported": ["cart:write", "orders:read"],
  "bearer_methods_supported": ["header"]
}

Support PKCE and dynamic client registration (RFC 7591) so agents can onboard without a manual app review.

None of /.well-known/agent-card.json, /.well-known/agent.json, and /.well-known/agent-skills/index.json was found. An A2A agent card tells other agents that your store has an agent of its own and what it can do; an Agent Skills index lists reusable skill files. Either satisfies this one-point check.

A minimal A2A agent card at /.well-known/agent-card.json:

{
  "name": "Example Shopping Assistant",
  "description": "Find, compare, and buy Example products.",
  "url": "https://www.example.com/a2a",
  "version": "1.0.0",
  "protocolVersion": "0.3.0",
  "capabilities": { "streaming": true },
  "defaultInputModes": ["text/plain"],
  "defaultOutputModes": ["text/plain", "application/json"],
  "skills": [
    {
      "id": "find-products",
      "name": "Find products",
      "description": "Search the catalog by query, size, colour, and price.",
      "tags": ["shopping", "search"]
    }
  ]
}

Or, if you publish skills rather than an agent, serve /.well-known/agent-skills/index.json listing each skill's name, description, and the URL of its SKILL.md. Only publish a card for an endpoint that actually answers.

Your product markup has no aggregateRating. Agents weigh review scores heavily when choosing between similar products, and they only trust ratings they can read from structured data.

Add to the Product node, with real numbers from reviews shown on the page:

"aggregateRating": {
  "@type": "AggregateRating",
  "ratingValue": "4.6",
  "reviewCount": "128",
  "bestRating": "5"
}

Only emit it for products that actually have reviews, and keep it server-rendered: markup injected by a review widget's JavaScript is invisible to agents.