set_display_config

THE RISK

Medium Risk

Why set_display_config needs a policy

This tool creates or modifies display configuration state for a web viewer, which is reversible and has no external side effects beyond UI presentation. It does not execute code, delete data, or cause financial impact. The blast radius is limited to altering how the game is rendered, with no irreversible consequences or security-critical operations.

From the tool's definition Tool name 'set_display_config' and description 'Set display configuration for the web viewer. Can set any subset of options.' indicate modification of configuration settings.

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

POLICY

How to control set_display_config

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

policy.json

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

set_display_config 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 DMCP — 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 DMCP tools

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All 204 DMCP 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 set_display_config

What does the set_display_config tool do? +

Set display configuration for the web viewer. Can set any subset of options. It is categorised as a Write tool in the DMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_display_config? +

Register the D MCP server in PolicyLayer and add a rule for set_display_config: 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 DMCP. Nothing to install.

What risk level is set_display_config? +

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

Can I rate-limit set_display_config? +

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

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

set_display_config is provided by the D MCP server (shawnrushefsky/dmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every DMCP tool call.

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

CHECK YOUR STACK →