AI agents call lookup_player to retrieve information from OSRS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a query operation that retrieves information about a player in Old School RuneScape. It has no side effects, does not modify data, and returns public game statistics/profile information. The function is purely informational, consistent with the Read category for tools that retrieve or query data without causing changes to the system or game state.
From the tool's definition Tool name 'lookup_player' and description 'Look up an OSRS player' indicate retrieval of publicly available player data with no modification capability.
Documented attack patterns abuse exactly the kind of access lookup_player gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and OSRS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for lookup_player:
{
"version": "1",
"default": "deny",
"tools": {
"lookup_player": {}
}
}lookup_player is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Look up an OSRS player. It is categorised as a Read tool in the OSRS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the OSRS MCP Server MCP server in PolicyLayer and add a rule for lookup_player: 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 OSRS MCP Server. Nothing to install.
lookup_player 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 lookup_player 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 lookup_player. 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.
lookup_player is provided by the OSRS MCP Server MCP server (jayarrowz/mcp-osrs). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from OSRS MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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23 OSRS MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.