send_private_message · DM20 Protocol MCP: Risk & Policy

WHAT IT DOES

What send_private_message does on DM20 Protocol

AI agents use send_private_message 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 send_private_message needs a policy

Without a description, confidence is moderately reduced, but the name clearly suggests message creation rather than retrieval (Read), code execution (Execute), or deletion (Destructive). The tool operates within a D&D campaign management context, making financial/destructive impacts unlikely.

From the tool's definition Tool named 'send_private_message' with an empty description. The name indicates it creates/sends a message, which is a Write operation (creates data/communications).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_private_message Rate-limited

send_private_message 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": {
    "send_private_message": {
      "limits": [
        {
          "counter": "send_private_message_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 send_private_message

What does the send_private_message tool do? +

send_private_message. 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 send_private_message? +

Register the DM20 Protocol MCP server in PolicyLayer and add a rule for send_private_message: 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 send_private_message? +

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

Can I rate-limit send_private_message? +

Yes. Add a rate_limit block to the send_private_message 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 send_private_message completely? +

Set action: deny in the PolicyLayer policy for send_private_message. 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 send_private_message? +

send_private_message 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.