AI agents use next_turn to create or update resources in D&D MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your D&D MCP Server environment.
This tool modifies the state of a combat encounter by advancing the turn order. It is a reversible state change within a game management system (could go back or restart combat), making it a Write operation. The blast radius is minimal as it only affects an in-game D&D campaign tracking state.
From the tool's definition Advance to the next turn in combat
Documented attack patterns abuse exactly the kind of access next_turn gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and D&D MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for next_turn:
{
"version": "1",
"default": "deny",
"tools": {
"next_turn": {
"limits": [
{
"counter": "next_turn_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}next_turn stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Advance to the next turn in combat. It is categorised as a Write tool in the D&D MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the D&D MCP Server MCP server in PolicyLayer and add a rule for next_turn: 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 MCP Server. Nothing to install.
next_turn is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the next_turn 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 next_turn. 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.
next_turn is provided by the D&D MCP Server MCP server (study-flamingo/gamemaster-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from D&D 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.
30 D&D MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.