fl_attachment_add · ArcGIS MCP: Risk & Policy

WHAT IT DOES

What fl_attachment_add does on ArcGIS MCP

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

WHY IT NEEDS A POLICY

Why fl_attachment_add needs a policy

The tool name suggests adding attachments to feature layer items in ArcGIS, which is a reversible write operation that creates or modifies data. It does not delete, execute arbitrary code, or involve financial transactions. Medium severity reflects that uncontrolled attachment uploads could consume storage or introduce malicious files, but the operation remains reversible.

From the tool's definition Tool name 'fl_attachment_add' contains 'add' which indicates creating/adding data to a feature layer attachment. Description is empty, preventing full analysis.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

fl_attachment_add Rate-limited

fl_attachment_add 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": {
    "fl_attachment_add": {
      "limits": [
        {
          "counter": "fl_attachment_add_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about fl_attachment_add

What does the fl_attachment_add tool do? +

fl_attachment_add. It is categorised as a Write tool in the ArcGIS MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on fl_attachment_add? +

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

What risk level is fl_attachment_add? +

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

Can I rate-limit fl_attachment_add? +

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

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

fl_attachment_add is provided by the ArcGIS MCP server (renemorenow/arcgis-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.