AI agents call get_random_table to retrieve information from DMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data (a random table) without modifying, deleting, or executing operations with external side effects. In the context of a dungeon master RPG server, accessing game data like random encounter tables, loot tables, or NPC name tables is a benign read operation. No reversible or irreversible modifications occur, and no code execution or financial transactions are involved.
From the tool's definition Tool name 'get_random_table' and description 'Get a random table by ID' indicate a retrieval operation. The verb 'Get' and the read-only nature of fetching data by identifier are characteristic of Read operations.
Documented attack patterns abuse exactly the kind of access get_random_table gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and DMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for get_random_table:
{
"version": "1",
"default": "deny",
"tools": {
"get_random_table": {}
}
}get_random_table is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get a random table by ID. It is categorised as a Read tool in the DMCP MCP Server, which means it retrieves data without modifying state.
Register the D MCP server in PolicyLayer and add a rule for get_random_table: 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 DMCP. Nothing to install.
get_random_table 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 get_random_table 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 get_random_table. 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.
get_random_table is provided by the D MCP server (shawnrushefsky/dmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from DMCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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204 DMCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.