add_item_to_character · DM20 Protocol MCP: Risk & Policy

WHAT IT DOES

What add_item_to_character does on DM20 Protocol

AI agents use add_item_to_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 add_item_to_character needs a policy

The tool creates or modifies reversible data within a character's inventory state. While this is not a Read operation (it changes data), it is reversible (items can be removed), and there is no indication of destructive deletion, financial impact, or arbitrary code execution.

From the tool's definition Tool name 'add_item_to_character' indicates creating or modifying character data by adding inventory items.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_item_to_character Rate-limited

add_item_to_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": {
    "add_item_to_character": {
      "limits": [
        {
          "counter": "add_item_to_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 add_item_to_character

What does the add_item_to_character tool do? +

add_item_to_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 add_item_to_character? +

Register the DM20 Protocol MCP server in PolicyLayer and add a rule for add_item_to_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 add_item_to_character? +

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

Can I rate-limit add_item_to_character? +

Yes. Add a rate_limit block to the add_item_to_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 add_item_to_character completely? +

Set action: deny in the PolicyLayer policy for add_item_to_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 add_item_to_character? +

add_item_to_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.