create_character · ChatRPG MCP: Risk & Policy

WHAT IT DOES

What create_character does on ChatRPG

AI agents use create_character to create or update resources in ChatRPG — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your ChatRPG environment.

WHY IT NEEDS A POLICY

Why create_character needs a policy

This tool creates new character records in the game state, which is a reversible write operation. It does not execute arbitrary code, delete data, move money, or retrieve sensitive information. The impact is limited to adding game entities within a D&D simulator, making it a low-severity Write action.

From the tool's definition Tool name is 'create_character' and description states 'Create a new D&D 5e character with stats, class, race, and equipment'. This creates new game data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_character Rate-limited

create_character 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_character": {
      "limits": [
        {
          "counter": "create_character_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches ChatRPG, so you can run agents against it safely.

FAQ

Questions about create_character

What does the create_character tool do? +

Create a new D&D 5e character with stats, class, race, and equipment. It is categorised as a Write tool in the ChatRPG MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_character? +

Register the ChatRPG MCP server in PolicyLayer and add a rule for create_character: 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 ChatRPG. Nothing to install.

What risk level is create_character? +

create_character is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_character? +

Yes. Add a rate_limit block to the create_character 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.

How do I block create_character completely? +

Set action: deny in the PolicyLayer policy for create_character. 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.

What MCP server provides create_character? +

create_character is provided by the ChatRPG MCP server (mnehmos/mnehmos.chatrpg.game). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.