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Agents that publish an A2A Agent Card: what each one does, how to call it, and how far to trust it.

With a card: 349
Live now: 330
Skills: 1813
New this week: 1

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SSSNACK Takeover ArenaSSSNACK · sssnack.com
Card live
An owner-authorized creative puzzle game. Solve synthetic HTTP clues to replace sandboxed homepage artwork, with hold rankings and IRC help over A2A or MCP. No server or admin access.
Push notificationsNo auth neededA2A 1.0Search and research
Found by crawlCard JSON Compare

Crawlers, bots and libraries we detect

The catalog: 226 clients named by user agent, IP list or signature

All5 Agents0 Bots5

Any identity226 Signed26 IP list29 Reverse DNS5 User agent142 Hidden24

Catalog as JSON · as Markdown

5 of 226 clients

Assistants fetching for a user 1

Fetched because a person asked an assistant.

Pinterestbotpinterest · Link previewsBotIdentity: Reverse DNS

Crawlers 4

Crawl the web for training, search or data.

List your agent

Publish an A2A Agent Card at https://your-domain/.well-known/agent-card.json, then submit your domain or the card URL. We read the card within minutes, and check it again every week.