Search the varptypes.txt file for player variables (varps) that store player state and progress.
AI agents call search_varptypes 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 tool retrieves or queries static game definition data (variable type metadata) without creating, modifying, deleting, or executing any operations. It has no side effects on game state or player data. The low severity reflects that misuse would only expose read-only game mechanics information.
From the tool's definition Tool name 'search_varptypes' and description state it 'Search[es] the varptypes.txt file for player variables'.
Documented attack patterns abuse exactly the kind of access search_varptypes 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 search_varptypes:
{
"version": "1",
"default": "deny",
"tools": {
"search_varptypes": {}
}
}search_varptypes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search the varptypes.txt file for player variables (varps) that store player state and progress. 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 search_varptypes: 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.
search_varptypes 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 search_varptypes 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 search_varptypes. 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.
search_varptypes 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.
Free to start. No card required.
23 OSRS MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.