Measured on the home page. Overall grade: Fair.
/.well-known/agent.json not found
Create a /.well-known/agent.json file following the A2A (Agent-to-Agent) protocol. It should include name, description, url, and skills fields describing your site's capabilities.
/.well-known/openapi.json not found
Create a /.well-known/openapi.json file with your API specification following the OpenAPI 3.x standard. See https://swagger.io/specification/ for the spec.
/.well-known/mcp.json not found
Create a /.well-known/mcp.json file describing your MCP server configuration. Include name, description, tools, and version fields. See https://modelcontextprotocol.io for the spec.
Homepage does not serve Markdown via content negotiation
Serve a Markdown representation of your pages when agents request "Accept: text/markdown". Agents like Claude Code and Cursor ask for it, and Markdown cuts token usage by ~80% vs HTML. Cloudflare ("Markdown for Agents") and Vercel can enable this without code changes.
No <link rel="alternate" type="text/markdown"> fallback found on the homepage
If you cannot enable content negotiation, advertise a Markdown version with <link rel="alternate" type="text/markdown" href="/index.md"> so agents can discover it.
No RSL license discovery found
Declare machine-readable licensing terms for your content with Really Simple Licensing. Add to robots.txt: License: https://your-site.com/license.xml — then publish the RSL document. See https://rslstandard.org.
No JSON-LD structured data found
Add a <script type="application/ld+json"> block in your HTML <head> with schema.org structured data describing your site, organization, or person.
1/5 emerging AI discovery files published
ai.txt not found
Publish /.well-known/ai.txt declaring opt-in/opt-out signals for AI training. See https://site.spawning.ai/spawning-ai-txt for the format.
genai.txt not found
Publish /.well-known/genai.txt declaring your generative-AI usage policy.
ai-plugin.json present at /.well-known/ai-plugin.json
agents.json not found
Publish /agents.json describing your site as a callable agent (OpenAgents / Wildcard emerging spec). Includes name, description, and operations[].
nlweb.json not found
Publish /.well-known/nlweb.json (Microsoft NLWeb) so agents can interact with the site through a natural-language interface.
No AI meta tags (ai:*) found
Add AI meta tags to your HTML <head>: <meta name="ai:summary" content="Brief description">, <meta name="ai:content_type" content="website">, <meta name="ai:author" content="Your Name">.
No rel="alternate" link to llms.txt in HTML
Add to your <head>: <link rel="alternate" type="text/plain" href="/llms.txt" title="LLM-optimized content">
No rel="alternate" link to agent.json in HTML
Add to your <head>: <link rel="alternate" type="application/json" href="/.well-known/agent.json" title="Agent Card">
No rel="me" identity links found
Add rel="me" links to verify your identity across platforms: <link rel="me" href="https://github.com/yourname">, <link rel="me" href="https://twitter.com/yourname">.
OpenGraph required tags present (og:title, og:description, og:url, og:type)
Twitter Card required tags present (twitter:card, twitter:title, twitter:description)
/robots.txt exists
No core AI crawlers explicitly configured
Add User-agent entries for core AI crawlers in your robots.txt. For each crawler, add: User-agent: <name> followed by Allow: / on the next line.
Sitemap directive present
No Content-Signal directive found (optional)
Declare how crawlers may use your content after access with the Content Signals Policy, e.g.: Content-Signal: search=yes, ai-train=no. Known signals: search, ai-input, ai-train. Generate yours at contentsignals.org.
0/48 known AI crawlers have explicit rules
Add explicit User-agent entries for more AI crawlers to maximize discoverability.
Response compressed with Brotli (br)
No ETag or Last-Modified header — conditional requests unsupported
Send an ETag or Last-Modified header so crawlers can revalidate with If-None-Match / If-Modified-Since and receive a cheap 304 Not Modified instead of the full body.
Homepage size is reasonable (254.2 KB decompressed)
/.well-known/security.txt exists
Required field "Contact" present
Required field "Expires" missing (RFC 9116)
Add "Expires:" to your security.txt. Use an ISO 8601 date, e.g., Expires: 2026-12-31T23:59:59.000Z
1/5 optional fields present
Missing critical header: X-Content-Type-Options
Add the X-Content-Type-Options response header to your server configuration. This is a critical security header.
4/7 security headers present
No Link header for AI discovery (llms.txt, agent.json)
Add a Link response header pointing to your AI discovery files: Link: </llms.txt>; rel="alternate"; type="text/plain", </.well-known/agent.json>; rel="alternate"; type="application/json"
<title> length 49 chars: "Slack | AI Work Platform & Productivity Tools"
Meta description is long (173 chars)
Trim to 70-160 characters; longer descriptions get truncated.
Canonical URL: https://slack.com
<html lang="en-US">
UTF-8 charset declared
Viewport meta present: "width=device-width, initial-scale=1"
16 hreflang alternate(s) including x-default
/llms.txt exists
/llms.txt Content-Type OK (text/plain)
H1 heading: "Slack"
Blockquote description present
7 section heading(s) found
165 link(s) found
/llms-full.txt not found (optional but recommended)
Create a /llms-full.txt with expanded content — full documentation, API details, and comprehensive site information for AI agents.
Sitemap located: https://slack.com/sitemap.xml
Content-Type is XML (application/xml)
Sitemap-index references 13 child sitemap(s)
3/3 sample child sitemap(s) reachable
Sample yielded 4532 URL(s) across 3 child(ren)
Site is served over HTTPS
HTTP requests redirect to HTTPS
HSTS max-age=31536000
HSTS includes subdomains
HSTS preload-eligible
All 8 core AI crawler user-agents receive equivalent responses
Server-rendered content detected (2162 words, 13672 chars of visible text)
Text-to-markup ratio is healthy (5.3%)
Semantic landmarks present (main, section, header, footer, nav)
Single <h1> heading: "All your people and AI agents working together."
91/91 <img> tags have alt attributes