share_group_replace · ArcGIS MCP: Risk & Policy

WHAT IT DOES

What share_group_replace does on ArcGIS MCP

AI agents use share_group_replace 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_replace needs a policy

Based on the name pattern, this tool likely modifies group sharing configurations or membership, which are data changes that can be reversed (Write category). The empty description reduces confidence slightly. Severity is medium because incorrect group sharing changes could affect access controls for multiple users, but the impact is typically reversible through administrative action.

From the tool's definition Tool name is 'share_group_replace' which indicates modifying group membership or sharing settings. The verb 'replace' suggests reversible modification of data associations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

share_group_replace Rate-limited

share_group_replace 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_replace": {
      "limits": [
        {
          "counter": "share_group_replace_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_replace

What does the share_group_replace tool do? +

share_group_replace. 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_replace? +

Register the ArcGIS MCP server in PolicyLayer and add a rule for share_group_replace: 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_replace? +

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

Can I rate-limit share_group_replace? +

Yes. Add a rate_limit block to the share_group_replace 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_replace completely? +

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

share_group_replace 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.