add_session_note · DM20 Protocol MCP: Risk & Policy

WHAT IT DOES

What add_session_note does on DM20 Protocol

AI agents use add_session_note 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 add_session_note needs a policy

The tool creates new session notes, a reversible write operation typical of campaign management. Given the server context (D&D campaign management), this writes non-critical game data. No destructive, financial, or execute-level operations are indicated by the name.

From the tool's definition Tool name 'add_session_note' indicates writing/creating session notes. Description is empty, limiting direct evidence.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_session_note Rate-limited

add_session_note 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": {
    "add_session_note": {
      "limits": [
        {
          "counter": "add_session_note_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 add_session_note

What does the add_session_note tool do? +

add_session_note. 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 add_session_note? +

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

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

Can I rate-limit add_session_note? +

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

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

add_session_note 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.