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Nullcone Threat Intelligence
io.github.maco144/nullcone in the official MCP registry.
Endpoint https://nullcone.ai/mcp. Source: github.com/maco144/nullcone-mcp.
The registry describes it as: Real-time threat intel for AI agents: 890K+ IOCs incl. prompt-injection & AI-skill threats
We read its 30 tools on 2026-10-26. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
submit_ioc submit_batch lookup_ioc recent_threats family_threats list_families search_by_type report_detection vote_false_positive poll_since get_stats validate_skill scan_skill_content get_new_threats warm_prompt_cache check_prompt check_prompt_batch prompt_cache_stats check_freshness freshness_limits fingerprint_tool_metadata registry_monitor_stats registry_flagged_tools subscribe_threats drain_subscription unsubscribe list_subscriptions revoke_ioc is_ioc_revoked list_revocations
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The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-github-maco144-nullcone)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.
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