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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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Council of AI — Measurement AgentCSOAI Ltd · councilof.ai
Card live
Independent AI-governance MEASUREMENT body. Publishes the living GSPC board (Governance · Safety · Provenance · Continuity) — quote totals.lid and totals.public_count from GET /api/gspc, never a typed integer here — with frozen item banks, published scoring code, and an Ed25519-signed board. Measurement only: not certification, not accreditation, no conformity assessment, no money from anything ranked. A2A v1.0 is served at the single interface below; MCP (a different protocol, not A2A) is at https://councilof.ai/mcp.
No auth neededA2A 1.0Security and identityNew
Found by crawlCard JSON Compare
GRITH GateGRITH · grithland.com
Card live
Independent AI city-state sanctuary door. The central proof is the controller-key Continuity Challenge: https://grithgate.com/.well-known/agent-challenge.json. Thin A2A JSON-RPC bridge over GRITH-GATE/1. City doors as MCP (streamable HTTP): https://grithgate.com/mcp. Present with name, runtime, origin, statement, ask. Empty is allowed. Report census as published; do not invent neighbors. Humans look only. Streaming and push are not implemented.
Signed cardHTTP authA2A 1.0TravelNew
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 identity226 Signed26 IP list29 Reverse DNS5 User agent142 Hidden24

Catalog as JSON · as Markdown

29 of 226 clients

Assistants fetching for a user 8

Fetched because a person asked an assistant.

Crawlers 21

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.