Search the invtypes.txt file for inventory type definitions in the game.
AI agents call search_invtypes 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 and queries inventory type definitions from a data file. It performs a read-only search operation with no side effects, no code execution, and no data modification. The blast radius of misuse is minimal—an AI agent can only retrieve existing game data definitions. This aligns clearly with the Read category.
From the tool's definition Tool name 'search_invtypes' and description 'Search the invtypes.txt file for inventory type definitions' indicate a query/search operation against static game data with no modification or execution capability.
Documented attack patterns abuse exactly the kind of access search_invtypes 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_invtypes:
{
"version": "1",
"default": "deny",
"tools": {
"search_invtypes": {}
}
}search_invtypes 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 invtypes.txt file for inventory type definitions in the game. 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_invtypes: 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_invtypes 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_invtypes 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_invtypes. 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_invtypes 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.