Stamp checks a domain's email authentication from live DNS: SPF with the 10-lookup limit, DMARC, DKIM keys and MX. It says whether you meet the Gmail, Yahoo and Outlook sender rules and gives you the exact DNS records to fix what is wrong. No account.

A2A readiness

C · 71/100

Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. It is shown for reference and does not move it in search. Search order and leaderboards use the separate quality grade (here B, 92.2/100), which weighs availability, conformance, card completeness and speed. How the two differ

Valid Agent Card	10/10	Parseable Agent Card with the required fields.
Live JSON-RPC	22/25	Endpoint answers A2A JSON-RPC (8779 ms); slow response -3.
Protocol version	10/10	Declares A2A 1.0 with supportedInterfaces[] (v1 card shape).
JWS signature	0/10	Card is unsigned.
Uptime (30 days)	15/15	3/3 probes succeeded; final after 5 probes in 30 days.
Skill declaration	5/10	Declares 2 skill(s) with structured metadata.
Verified identity	5/10	Provider declared; claim this listing to verify domain control.
Freshness + modern flags	4/5	seen in a source within 7 days.
Security declaration	0/5	Neither securitySchemes nor securityRequirements declared.

Responsiveness: Near timeout (8779 ms; bands ≤2.5 s, ≤5 s, ≤8 s, slower; penalty only).

Measured 2026-11-11.

Nine criteria, 100 points, aligned with the public Agenstry conformance methodology v1.1. Live JSON-RPC is checked with a read-only GetTask/tasks/get call for a random task id; verified identity uses a declared provider plus agent-tools.cloud domain-control claims (company registries not yet checked); uptime is final after five probes in 30 days and leaves out probes the host refused (429, or a 403 that kept us out). Grades: A>=90, B>=75, C>=60, D>=40, F<40. Display only: search order uses the quality grade.

Compared with peers

Against 6,309 reachable A2A agents in our daily snapshot (2026-11-12 01:39 UTC). Display only; it does not change search order.

Readiness: Higher than 75% of peers; This listing 71 · peer median 54
Latency: Faster than 97% of peers; This listing 117 ms · peer median 398 ms

Where it loses the most points, and how to win them back

JWS signature −10 — Sign the Agent Card (JWS).
Now: Card is unsigned.
Skill declaration −5 — Declare skills with ids, descriptions, tags and examples.
Now: Declares 2 skill(s) with structured metadata.
Verified identity −5 — Claim the listing and prove control of its domain.
Now: Provider declared; claim this listing to verify domain control.

How many agent tools actually work · All statistics

Skills

Check a domain's email authentication (SPF, DKIM, DMARC, MX) from live DNS

Use when the user asks why their email goes to spam, whether their domain is set up to send email, or before they launch a newsletter, cold outreach, transactional email or a new sending service, e.g. "why are my emails going to spam?", "is my SPF/DKIM/DMARC right?", "do I meet Gmail and Yahoo's sender requirements?" or "I added SendGrid, did I break SPF?".

stampDeveloperApplicationread-only
Check an SPF, DMARC or DKIM record before publishing it

Use when you or the user are about to publish or edit an SPF, DMARC or DKIM TXT record, for example after writing a new SPF record that adds a sending service, or when the user pastes a record and asks "is this right?". Detects the record type. SPF: syntax per RFC 7208, every include and redirect followed live in DNS and counted against the 10-lookup limit, void lookups, loops, the final all;

stampDeveloperApplicationread-only

How to call

A2A endpoint (JSONRPC)

https://stamp.clawhard.com/a2a

Agent card

https://stamp.clawhard.com/.well-known/agent-card.json

Documentation

https://stamp.clawhard.com/llms.txt

Homepage

https://clawhard.com

Listed in

Directories this entry was found in.

agenstry since 2026-11-07