AI agents call mc_list_players to retrieve information from Mc Rcon without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about currently connected players—a read-only operation with no side effects. It does not create, modify, delete, execute commands, or affect game state. The blast radius of misuse is minimal; an agent querying player lists cannot harm the server or its data.
From the tool's definition Tool name 'mc_list_players' and description 'List all online players on the server' indicate a query operation that retrieves data without modifying state or executing commands.
Attacks that exploit this kind of access
List all online players on the server. It is categorised as a Read tool in the Mc Rcon MCP Server, which means it retrieves data without modifying state.
Register the Mc Rcon MCP server in PolicyLayer and add a rule for mc_list_players: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Mc Rcon. Nothing to install.
mc_list_players is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the mc_list_players rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for mc_list_players. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
mc_list_players is provided by the Mc Rcon MCP server (pedxyuyuko/mc-rcon-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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