share_group_add · ArcGIS MCP: Risk & Policy

WHAT IT DOES

What share_group_add does on ArcGIS MCP

AI agents use share_group_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 share_group_add needs a policy

Based on naming convention and context as part of ArcGIS's user/group management suite, this tool creates or modifies sharing permissions or group memberships—reversible write operations. Without explicit documentation, confidence is moderately high but not absolute. The blast radius is medium: misuse could grant unintended users access to resources, but changes are reversible via removal or permission adjustments.

From the tool's definition Tool name 'share_group_add' indicates adding a group to a sharing relationship; the verb 'add' is a write operation. Description is empty, limiting certainty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

share_group_add Rate-limited

share_group_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": {
    "share_group_add": {
      "limits": [
        {
          "counter": "share_group_add_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 ArcGIS MCP, so you can run agents against it safely.

FAQ

Questions about share_group_add

What does the share_group_add tool do? +

share_group_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 share_group_add? +

Register the ArcGIS MCP server in PolicyLayer and add a rule for share_group_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 share_group_add? +

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

Can I rate-limit share_group_add? +

Yes. Add a rate_limit block to the share_group_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 share_group_add completely? +

Set action: deny in the PolicyLayer policy for share_group_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 share_group_add? +

share_group_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.