batch_fix_mermaid · Notemd MCP Server MCP: Risk & Policy

WHAT IT DOES

What batch_fix_mermaid does on Notemd MCP Server

AI agents use batch_fix_mermaid to create or update resources in Notemd MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Notemd MCP Server environment.

WHY IT NEEDS A POLICY

Why batch_fix_mermaid needs a policy

The tool modifies existing Markdown files by fixing syntax errors in Mermaid diagrams and LaTeX expressions. This is a reversible modification (Write), not deletion (Destructive). However, the batch scope and automatic nature create high blast radius if applied to wrong files or with incorrect fixes, warranting high severity rather than medium.

From the tool's definition Tool performs batch operations that modify Markdown files: "Fix Mermaid and LaTeX syntax in all Markdown files in a folder." This involves updating content across multiple files, which is a Write operation.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

batch_fix_mermaid Rate-limited

batch_fix_mermaid 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about batch_fix_mermaid

What does the batch_fix_mermaid tool do? +

Fix Mermaid and LaTeX syntax in all Markdown files in a folder. It is categorised as a Write tool in the Notemd 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 batch_fix_mermaid? +

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

What risk level is batch_fix_mermaid? +

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

Can I rate-limit batch_fix_mermaid? +

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

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

batch_fix_mermaid is provided by the Notemd MCP Server MCP server (jacobinwwey/notemd-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.