long_rest · DM20 Protocol MCP: Risk & Policy

WHAT IT DOES

What long_rest does on DM20 Protocol

AI agents use long_rest 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 long_rest needs a policy

In D&D 5e, a long rest resets HP, spell slots, and other resources — this is a reversible state modification of character data. Given the server context (character sheets, combat tracking), 'long_rest' most likely applies rest mechanics to characters, which is a Write operation. However, since the description is empty, confidence is reduced.

From the tool's definition Tool name is 'long_rest'; description is empty or uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

long_rest Rate-limited

long_rest 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": {
    "long_rest": {
      "limits": [
        {
          "counter": "long_rest_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 long_rest

What does the long_rest tool do? +

long_rest. 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 long_rest? +

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

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

Can I rate-limit long_rest? +

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

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

long_rest 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.