create_layer · Leaflet MCP: Risk & Policy

WHAT IT DOES

What create_layer does on Leaflet

AI agents use create_layer 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 create_layer needs a policy

This tool generates code snippets for Leaflet map visualization elements. While it 'creates' layer definitions, it does not execute them, delete data, move money, or trigger irreversible actions. The output is code that developers use; creating a layer in Leaflet is a reversible operation (layers can be removed). This fits the Write category: creating/modifying data reversibly.

From the tool's definition Tool generates code for creating Leaflet layers (polylines, polygons, circles, rectangles, vector layers). The word 'Generate' and 'creating' indicate the tool produces or modifies data (code output), which is reversible and has no destructive side effects.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_layer Rate-limited

create_layer 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": {
    "create_layer": {
      "limits": [
        {
          "counter": "create_layer_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 create_layer

What does the create_layer tool do? +

Generate code for creating various Leaflet layers: polylines, polygons, circles, rectangles, and other vector layers. 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 create_layer? +

Register the Leaflet MCP server in PolicyLayer and add a rule for create_layer: 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 create_layer? +

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

Can I rate-limit create_layer? +

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

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

create_layer 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.