add_item_to_character

THE RISK

Medium Risk

Why add_item_to_character needs a policy

The tool creates or modifies character state by adding items to inventory. This is a reversible Write operation (items can be removed). Without an explicit description, confidence is moderate, but the naming pattern and server context (D&D campaign management) indicate structured data creation/modification rather than arbitrary code execution or deletion.

From the tool's definition Tool name 'add_item_to_character' indicates modification of character data (inventory/items). Description is empty, limiting confidence.

Documented attack patterns abuse exactly the kind of access add_item_to_character gives an agent:

POLICY

How to control add_item_to_character

PolicyLayer is an MCP gateway — it sits between your AI agents and D&D MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for add_item_to_character:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_item_to_character": {
      "limits": [
        {
          "counter": "add_item_to_character_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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.

Create a free account and register D&D MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More D&D MCP Server tools

Execute start_combat Start a combat encounter. Write end_combat End the current combat encounter. Write next_turn Advance to the next turn in combat. Write add_event add_event Write add_session_note add_session_note Write bulk_update_characters bulk_update_characters Write create_campaign create_campaign Write create_character create_character

All 30 D&D MCP Server tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

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 D&D MCP Server 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 D&D MCP Server 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 D&D MCP Server. 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 D&D MCP Server MCP server (study-flamingo/gamemaster-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every D&D MCP Server tool call.

Start from D&D MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →