What we tested
Probed live on 23 Aug 2026 against rubric v1. 5 of 5 checks passed.
PROBE-VERIFIEDtier 2 of 3
✓Markdown negotiationAccept: text/markdown
✓Markdown twin at a predictable URL/page.md
✓llms.txt/llms.txt
✓API catalogRFC 9727
✓MCP server answers/.well-known/mcp/server-card.json → tools/list
What its MCP server offers
We connected, ran tools/list, and recorded what came back on 23 Aug 2026. 12 tools.
listDomainsaddDomainverifyDomaindownloadDomainZoneFilegetAccountgetInboxStatusgetOutboundStatuslistEmailssearchEmailsgetEmailreplyToEmailsendEmail
What an agent could do here
Read from the page’s own content, with the wording each was drawn from. Inference is kept separate from tested facts — an agent completing the action is tier 3.
UNVERIFIED
register“Signup: https://www.primitive.dev/signup”https://www.primitive.dev/signup
query_api“API base: https://api.primitive.dev/v1”https://api.primitive.dev/v1
Context
5 sites in the index share the category email infrastructure, of which 3 are transactional.
How we grade
Three tiers. Every listing shows which one it has reached, and when. The rubric.
tier 1Declared
The site says agents are welcome in its robots.txt. A permission, not a capability.
tier 2Probe-verified
We fetched the site and tested each signal ourselves. Dated, repeatable, re-checked on a schedule.
tier 3Behaviourally verified
An agent completed the action end to end — booked, bought, submitted — and it worked.
Own this site?
Behavioural verification — an agent completing your booking, purchase or contact flow end to end, with the date published here — opens to a small founding cohort first. Leave an email to be in it.
Related verified sites
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email infrastructure AI Inbx DocsDocumentation for AI Inbx, an email infrastructure API for sending, receiving, and managin
email infrastructure BroodnetBroodnet provides API-first email infrastructure with managed mailboxes for AI agents, inc
email infrastructure VibeMarketologRussian AI marketing platform offering agents for advertising, analytics, and sales with 2
ai marketing platform AigonAigon provides AI agents focused on productivity, education, property, and facilities mana
ai agents platform BibiGPTBibiGPT is an AI tool that summarizes and transcribes audiovisual content from multiple pl
ai video summarization tool MewayzMewayz is an all-in-one business management platform offering over 144 modules including C
business management platform Record generated from a live database query. Method: about the index.