criba: who is calling your MCP server

com.cribalo/cribaVersion 0.1.0

Identify who calls your MCP server or A2A agent: declared identity vs observed behaviour.

Status

Responds275 msNov 14, 2026, 13:52 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 13:52 UTC
Latency: 275 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 22:14 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://criba.cribalo.com/mcpResponds275 msNov 14, 2026, 13:52 UTC

No sign-in

Claude Code

claude mcp add --transport http criba https://criba.cribalo.com/mcp

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: criba
Remote MCP server URL: https://criba.cribalo.com/mcp

Cursor

{
  "mcpServers": {
    "criba": {
      "url": "https://criba.cribalo.com/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"criba","type":"http","url":"https://criba.cribalo.com/mcp"}'

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Tools

3 tools

Tools of criba: who is calling your MCP server
	Description		Read-only	Idempotent	Open world
`classify_visitor`Classify one visitor from its requests to your MCP server, A2A agent or website. Returns the declared identity, the observed behaviour class (acts-on-results, agent-tool-use, agent-message, probe, indexer, web-scanner, web), the signals and reasons, and mismatch=true when behaviour contradicts the declared identity. All event fields are optional; send what your server parsed. At most 500 events.	Classify one visitor from its requests to your MCP server, A2A agent or website. Returns the declared identity, the observed behaviour class (acts-on-results, agent-tool-use, agent-message, probe, indexer, web-scanner, web), the signals and reasons, and mismatch=true when behaviour contradicts the declared identity. All event fields are optional; send what your server parsed. At most 500 events.	Not declared	Yes	Yes	No
`identify_client`Who a User-Agent and/or an MCP clientInfo.name claims to be, matched against criba's catalog of known MCP indexers, verifiers, A2A directories, AI crawlers, scanners and HTTP libraries. This is a declaration, not proof: use classify_visitor for behaviour. Pass at least one of the two.	Who a User-Agent and/or an MCP clientInfo.name claims to be, matched against criba's catalog of known MCP indexers, verifiers, A2A directories, AI crawlers, scanners and HTTP libraries. This is a declaration, not proof: use classify_visitor for behaviour. Pass at least one of the two.	Not declared	Yes	Yes	No
`list_known_bots`List criba's catalog of known agent-ecosystem bots, optionally filtered by category or protocol. Each entry has its id, name, category, URL, matching rules and what it was seen doing. Catalog 2026-11-11, CC-BY-NC-4.0 (non-commercial use with attribution).	List criba's catalog of known agent-ecosystem bots, optionally filtered by category or protocol. Each entry has its id, name, category, URL, matching rules and what it was seen doing. Catalog 2026-11-11, CC-BY-NC-4.0 (non-commercial use with attribution).	Not declared	Yes	Yes	No

Details

Registry status: Active
Published: Nov 9, 2026
Updated: Nov 9, 2026
Website: https://criba.cribalo.com/⁠ (opens in a new tab)
Repository: Not given
Categories (suggested): SecuritySuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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