list_themes_and_styles

THE RISK

Low Risk

Why list_themes_and_styles needs a policy

This tool simply enumerates and describes existing themes and styles available in the Marp presentation system. It performs a read-only query operation with no capability to modify, create, delete, or execute operations. The blast radius of misuse is minimal—an agent could only retrieve information about available themes.

From the tool's definition Tool name 'list_themes_and_styles' and description 'List all available themes and styles' clearly indicate data retrieval with no modification. No side effects or external operations are performed.

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

POLICY

How to control list_themes_and_styles

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_themes_and_styles": {}
  }
}

list_themes_and_styles is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Marp 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.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_themes_and_styles

What does the list_themes_and_styles tool do? +

List all available themes and styles with descriptions and layout counts. It is categorised as a Read tool in the Marp MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_themes_and_styles? +

Register the Marp MCP Server MCP server in PolicyLayer and add a rule for list_themes_and_styles: 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 Marp MCP Server. Nothing to install.

What risk level is list_themes_and_styles? +

list_themes_and_styles is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_themes_and_styles? +

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

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

list_themes_and_styles is provided by the Marp MCP Server MCP server (masaki39/marp-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Marp MCP Server tool call.

Start from Marp 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 →