Get champion mastery data (list or single champion)
AI agents call lol_get_champion_mastery to retrieve information from League of Legends MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves mastery statistics for League of Legends champions, returning player achievement data without modifying, executing operations, or causing side effects. It is a straightforward query operation with no destructive, financial, or execution capabilities. The low severity reflects that misuse would only expose or return existing player statistics with no harmful consequences.
From the tool's definition Tool name 'lol_get_champion_mastery' and description 'Get champion mastery data (list or single champion)' indicate data retrieval only. The verb 'Get' and the absence of modification language confirm read-only behavior.
Attacks that exploit this kind of access
Get champion mastery data (list or single champion). It is categorised as a Read tool in the League of Legends MCP Server MCP Server, which means it retrieves data without modifying state.
Register the League of Legends MCP Server MCP server in PolicyLayer and add a rule for lol_get_champion_mastery: 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 League of Legends MCP Server. Nothing to install.
lol_get_champion_mastery 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 lol_get_champion_mastery 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 lol_get_champion_mastery. 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.
lol_get_champion_mastery is provided by the League of Legends MCP Server MCP server (rexlmanu/lol-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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