share_set_access · ArcGIS MCP: Risk & Policy

WHAT IT DOES

What share_set_access does on ArcGIS MCP

AI agents use share_set_access 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_set_access needs a policy

The tool appears to modify access permissions on ArcGIS items or resources, which is a reversible Write operation. However, without a detailed description, there is moderate uncertainty about its exact scope. If misused by an AI agent, it could grant unintended access to sensitive geospatial data or resources, justifying high severity.

From the tool's definition Tool name 'share_set_access' suggests modifying access controls/permissions on shared resources in ArcGIS. The verb 'set' indicates a state change operation. Description is empty, limiting direct confirmation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

share_set_access Rate-limited

share_set_access 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_set_access": {
      "limits": [
        {
          "counter": "share_set_access_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_set_access

What does the share_set_access tool do? +

share_set_access. 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_set_access? +

Register the ArcGIS MCP server in PolicyLayer and add a rule for share_set_access: 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_set_access? +

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

Can I rate-limit share_set_access? +

Yes. Add a rate_limit block to the share_set_access 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_set_access completely? +

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

share_set_access 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.