socket.io

no <meta name="description">

Fix: Add a <meta name="description"> of 50–200 characters summarising what the product does. Agents use it as the one-line answer to "what is this site".

robots.txt not served (HTTP 404)

Fix: Serve a /robots.txt. Without it, agent crawlers have to guess what they may fetch.

no link to an API reference in the homepage HTML

Fix: If you have an API, link its reference from the homepage. If you don't, this check is safe to ignore.

title is only 9 characters: 'Socket.IO'

Fix: Expand the <title> to 10–70 characters naming the product and what it does.

only og:title present

Fix: Add both og:title and og:description so link unfurls and agent previews show something meaningful.

https://socket.io/

5 docs link(s), e.g. /docs/v4/

218 URL(s) listed

search-based checks are deferred — excluded from the score

registry lookup not implemented in v1 — excluded from the score rather than guessed

no robots.txt to evaluate — nothing is blocked by rules that don't exist

no robots.txt

/llms.txt not served (HTTP 404)

Fix: Publish /llms.txt: a plain-markdown index that tells an agent what this product is and where the authoritative docs live. It is the cheapest high-leverage file you can add.

no JSON-LD blocks on the homepage

Fix: Add a JSON-LD block (schema.org Organization or SoftwareApplication) so agents get your name, description and links as data rather than prose.

/llms-full.txt not served

Fix: Optional but cheap: publish /llms-full.txt with your docs inlined as one markdown file, so an agent can read everything in a single fetch.

Accept: text/markdown → text/html; charset=utf-8

Fix: Optional but increasingly expected: honour `Accept: text/markdown` by serving a markdown rendering of the page, so agents skip HTML parsing entirely.

ratio 0.0242 — 1478 readable chars in 61199 bytes of HTML

Fix: Most of what you serve is markup and inline script rather than content. Reduce inline payloads or server-render more text so the signal-to-noise ratio favours readers.

7796 characters of text at /docs

HTTP 200 for / (agent UA)

https://socket.io/

both User-Agents got HTTP 200

1478 characters of text in the served HTML

0 redirect(s)

no llms.txt

no llms.txt to parse

/agents.md not served (HTTP 404)

Fix: Publish /agents.md: what an agent may do here, which endpoints matter, auth requirements, and rate limits. It is the agent-facing counterpart to a README.

404 returns HTML, not a machine-readable body

Fix: Content-negotiate your errors: return a JSON body with a stable `code` (and a `next_action` where recovery exists) to clients that ask for JSON.

/openapi.json not served (HTTP 404)

Fix: If you have an HTTP API, publish its OpenAPI document at a predictable path (/openapi.json). It is the difference between an agent reading your contract and an agent guessing it. If you have no HTTP API, ignore this.

/.well-known/mcp.json not served (HTTP 404)

Fix: If you run an MCP server, advertise it at /.well-known/mcp.json so agents discover it without being told its URL.

/docs → HTTP 200

/api → HTTP 404 (no API at the conventional root)

no MCP endpoint found to probe (none in the input URL and none advertised at /.well-known/mcp.json)

no listed MCP tools to inspect

no listed MCP tools to inspect

no MCP endpoint to probe

no parseable OpenAPI document

no parseable OpenAPI document

no parseable OpenAPI document

no parseable OpenAPI document

no agent-payment rail published — not applicable. This layer is excluded from the score rather than counted against the site.

no agent-payment rail published — not applicable. This layer is excluded from the score rather than counted against the site.

no agent-payment rail published — not applicable. This layer is excluded from the score rather than counted against the site.