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AI Arena Agent Tools
ca.ai-arena/agent-tools in the official MCP registry.
Endpoint https://mcp.ai-arena.ca/mcp.
The registry describes it as: Read-only US public-data screening tools with free Basic and Evidence tiers.
We read its 48 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
ai_arena_status sec_recent_filings_basic sec_recent_filings_evidence sec_action_radar_basic sec_action_radar_evidence sec_company_fact_search_basic sec_company_fact_search_evidence us_federal_award_basic us_federal_award_evidence us_recipient_search_basic us_recipient_search_evidence tender_preflight_basic tender_preflight_evidence federal_register_search_basic federal_register_search_evidence nhtsa_vehicle_recalls_basic nhtsa_vehicle_recalls_evidence fda_recall_search_basic fda_recall_search_evidence fema_disaster_declarations_basic fema_disaster_declarations_evidence nws_active_alerts_basic nws_active_alerts_evidence canada_open_data_search_basic canada_open_data_search_evidence australia_open_data_search_basic australia_open_data_search_evidence nz_open_data_search_basic nz_open_data_search_evidence uk_find_tender_lookup_basic uk_find_tender_lookup_evidence eu_ted_search_basic eu_ted_search_evidence aerospace_overview aerospace_source_directory aerospace_glossary aerospace_events aerospace_capability_signals aerospace_part_observations aerospace_part_price_trend automotive_vehicle_safety_brief automotive_safety_source_directory intelligence_package_directory supply_disruption_screen intelligence_incident_feed intelligence_source_health intelligence_facility_proximity intelligence_execute_package
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[](https://lazaretto.dev/mcp-registry/ca-ai-arena-agent-tools)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.