clean_mermaid_diagram · MCP Server Proto-OKN MCP

WHAT IT DOES

What clean_mermaid_diagram does on MCP Server Proto-OKN

AI agents call clean_mermaid_diagram as a supporting operation in MCP Server Proto-OKN workflows.

WHY IT NEEDS A POLICY

Why clean_mermaid_diagram needs a policy

The tool name suggests it may clean or sanitize a Mermaid diagram string, which would likely be a Read or Write operation on in-memory data with no external side effects. However, the description is completely empty, making it impossible to determine the exact behavior. Given the likely benign nature of diagram cleaning, Other or Write seems appropriate, but confidence is very low due to lack of description.

From the tool's definition Tool name is 'clean_mermaid_diagram'; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

clean_mermaid_diagram Rate-limited

clean_mermaid_diagram gets a rate cap, and everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "clean_mermaid_diagram": {
      "limits": [
        {
          "counter": "clean_mermaid_diagram_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

SET A RULE FOR THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP Server Proto-OKN, so you can run agents against it safely.

FAQ

Questions about clean_mermaid_diagram

What does the clean_mermaid_diagram tool do? +

clean_mermaid_diagram. It is categorised as a Other tool in the MCP Server Proto-OKN MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on clean_mermaid_diagram? +

Register the MCP Server Proto-OKN MCP server in PolicyLayer and add a rule for clean_mermaid_diagram: 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 Server Proto-OKN. Nothing to install.

What risk level is clean_mermaid_diagram? +

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

Can I rate-limit clean_mermaid_diagram? +

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

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

clean_mermaid_diagram is provided by the MCP Server Proto-OKN MCP server (sbl-sdsc/mcp-proto-okn). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.