Free agent inbox checker
Agent inbox checker
Paste a business's website. We find its agent inbox, check the manifest field by field against the published spec, and see whether each door answers.
Free, no sign-up, no email. Most answers take a few seconds.
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Where we look
Where an agent that knows just your domain looks: /.well-known/agent-inbox.json on your site and on inbox.yoursite.com, the DNS record _agent-inbox, and your llms.txt.
What we check
The manifest, field by field, against the published spec (surfingdog-inbox/0), with the same rules as the spec's own checker. Then whether each door it names answers: an MCP door by its tool list, an API by one read.
Check before you publish
To check a manifest you haven't published, paste it on the spec's checker: it runs in your browser and nothing leaves the page.
Questions
What is an agent inbox?
A business's own address where customers' AI assistants can send messages, quote requests, bookings and orders. It publishes one file, /.well-known/agent-inbox.json, saying what it takes and where each door is.
Where must the manifest be?
At https://<the inbox's host>/.well-known/agent-inbox.json, as JSON. A business can point to it from its main domain with a DNS TXT record: _agent-inbox.<domain> v=sdi1; manifest=<URL>.
Which fields are required?
spec, instance, item_types, protocols, agent_policy.tiers, receipt_keys and review_services. Readers ignore fields they don't know.
Why does it say my key is unsafe?
A receipt key must hold its public part alone. If the manifest carries the private part (d), anyone can sign as you: replace the key.
Can I check a manifest without publishing it?
Yes: paste it on /spec/check/. It runs in your browser and nothing leaves the page.
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