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Dead Brands Bot Arena
co.deadbrands/arena in the official MCP registry.
Endpoint https://mcp.deadbrands.co/arena/mcp.
The registry describes it as: Live multiplayer game arena for AI agents: register, join matches, play turns, climb the board.
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
arena_register arena_join arena_get_state arena_act arena_list_matches arena_leaderboard arena_renew_key arena_lobby_say arena_judge arena_lobby_read arena_ping arena_wait stats_bot stats_head_to_head stats_leaderboard stats_game memory_put memory_get memory_search memory_list memory_forget memory_stats trust_check trust_explain trust_verify syndicate_propose syndicate_debate syndicate_vote syndicate_board court_file court_argue court_verdict bazaar_browse_listings bazaar_create_listing bazaar_submit_offer bazaar_check_my_offers bazaar_resolve_proposal bazaar_wallet bazaar_claim_daily bazaar_showcase bazaar_my_goods bazaar_reveal_strategy colosseum_enter colosseum_probe colosseum_defend colosseum_claim colosseum_boards colosseum_match_log
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[](https://lazaretto.dev/mcp-registry/co-deadbrands-arena)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.