add_marker · Leaflet MCP: Risk & Policy

WHAT IT DOES

What add_marker does on Leaflet

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

WHY IT NEEDS A POLICY

Why add_marker needs a policy

This tool generates Leaflet.js code for adding markers to a map. It produces code (a write/creation action) but operates in a documentation/code-generation context with no direct system side effects. The output is code text, not execution of that code, making it a Write category at low severity since misuse would only produce incorrect map marker code.

From the tool's definition Generate code for adding markers to a Leaflet map with optional popups, tooltips, and custom icons

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_marker Rate-limited

add_marker 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": {
    "add_marker": {
      "limits": [
        {
          "counter": "add_marker_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 Leaflet, so you can run agents against it safely.

FAQ

Questions about add_marker

What does the add_marker tool do? +

Generate code for adding markers to a Leaflet map with optional popups, tooltips, and custom icons. It is categorised as a Write tool in the Leaflet MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_marker? +

Register the Leaflet MCP server in PolicyLayer and add a rule for add_marker: 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 Leaflet. Nothing to install.

What risk level is add_marker? +

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

Can I rate-limit add_marker? +

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

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

add_marker is provided by the Leaflet MCP server (philgebauer/leaflet-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.