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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.

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marginaliaPolycode Limited · marginalia.polycode.co.uk
Card live
A persistent, memory-graph-backed chat agent. Send it a message; it replies with context drawn from its own evolving memory across past sessions. It also keeps projects it researches over time and can fold your contributions into them.
StreamingNo auth neededA2A 0.3Search and researchNew
Found by crawlCard JSON Compare

Crawlers, bots and libraries we detect

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

All29 Agents7 Bots22

Any identity57 Signed19 IP list7 Reverse DNS0 User agent18 Hidden13

Catalog as JSON · as Markdown

7 of 226 clients

Assistants fetching for a user 7

Fetched because a person asked an assistant.

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.