Search the varbittypes.txt file for variable bits (varbits) that store individual bits from varps.
AI agents call search_varbittypes 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 data from a static game definition file (varbittypes.txt) without modifying, executing, or deleting anything. It is a search/lookup operation similar to the other Read-category tools on this server (osrs_wiki_search, search_data_file, lookup_player).
From the tool's definition Tool name 'search_varbittypes' and description 'Search the varbittypes.txt file for variable bits (varbits)' indicate a read-only query operation against a game data file.
Documented attack patterns abuse exactly the kind of access search_varbittypes 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_varbittypes:
{
"version": "1",
"default": "deny",
"tools": {
"search_varbittypes": {}
}
}search_varbittypes 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 varbittypes.txt file for variable bits (varbits) that store individual bits from varps. 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_varbittypes: 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_varbittypes 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_varbittypes 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_varbittypes. 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_varbittypes 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.