create_character · DM20 Protocol MCP: Risk & Policy

WHAT IT DOES

What create_character does on DM20 Protocol

AI agents use create_character to create or update resources in DM20 Protocol — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your DM20 Protocol environment.

WHY IT NEEDS A POLICY

Why create_character needs a policy

Creating a character in a D&D campaign system is a write operation that modifies game state by adding a new record. It is reversible (characters can be deleted), has limited blast radius (affects only game data, not real systems), and poses low risk since the worst outcome is erroneous character creation in a game context. No financial, destructive, or execution-level harm is possible.

From the tool's definition Tool name 'create_character' indicates creation of a new character record. The description is empty, but based on server context (D&D campaign management with character sheets) and sibling tools like 'add_item_to_character' and 'approve_sheet_change', this…

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 DM20 Protocol, so you can run agents against it safely.

FAQ

Questions about create_character

What does the create_character tool do? +

create_character. It is categorised as a Write tool in the DM20 Protocol 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 DM20 Protocol 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 DM20 Protocol. 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 DM20 Protocol MCP server (polloinfilzato/dm20-protocol). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.