mermaid_tool

THE RISK

Low Risk

Why mermaid_tool needs a policy

The tool generates diagrams for visualization purposes, which is a retrieval/generation operation with no side effects. It does not modify data, execute code, delete resources, or perform financial transactions. The severity is low because even if misused, diagram generation poses minimal risk — the output is visual content that cannot harm infrastructure or data integrity.

From the tool's definition Tool description states it 'Generate[s] Mermaid diagrams for visualization based on planning' — a diagram generation/visualization tool that reads input and produces output without modifying any external systems or data.

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

POLICY

How to control mermaid_tool

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

policy.json

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

mermaid_tool 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 MCP Project Orchestrator — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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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 mermaid_tool

What does the mermaid_tool tool do? +

Generate Mermaid diagrams for visualization based on planning. It is categorised as a Read tool in the MCP Project Orchestrator MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on mermaid_tool? +

Register the MCP Project Orchestrator MCP server in PolicyLayer and add a rule for mermaid_tool: 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 MCP Project Orchestrator. Nothing to install.

What risk level is mermaid_tool? +

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

Can I rate-limit mermaid_tool? +

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

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

mermaid_tool is provided by the MCP Project Orchestrator MCP server (sparesparrow/mcp-project-orchestrator). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Project Orchestrator tool call.

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

CHECK YOUR STACK →