List all available monster types in D&D 5e.
AI agents call list_monster_types to retrieve information from D&D Knowledge Navigator without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple enumeration of game reference data (monster types). It has no side effects, does not modify any data, does not execute code or commands, and does not involve financial transactions. It is a pure read operation typical of a knowledge/reference API.
From the tool's definition Tool name 'list_monster_types' and description 'List all available monster types in D&D 5e' indicate a query operation that retrieves and displays reference data with no modification, deletion, or execution of external operations.
Documented attack patterns abuse exactly the kind of access list_monster_types gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and D&D Knowledge Navigator, and nothing reaches the server without passing your rules. This is the rule we recommend for list_monster_types:
{
"version": "1",
"default": "deny",
"tools": {
"list_monster_types": {}
}
}list_monster_types is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all available monster types in D&D 5e. It is categorised as a Read tool in the D&D Knowledge Navigator MCP Server, which means it retrieves data without modifying state.
Register the D&D Knowledge Navigator MCP server in PolicyLayer and add a rule for list_monster_types: 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 D&D Knowledge Navigator. Nothing to install.
list_monster_types 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 list_monster_types 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 list_monster_types. 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.
list_monster_types is provided by the D&D Knowledge Navigator MCP server (procload/dnd-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 14 D&D Knowledge Navigator tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
14 D&D Knowledge Navigator tools catalogued and risk-classified — across an index of 42,500+ MCP servers.