set_workspace · Arcmap MCP: Risk & Policy

WHAT IT DOES

What set_workspace does on Arcmap

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

WHY IT NEEDS A POLICY

Why set_workspace needs a policy

set_workspace modifies arcpy's environment variable to point to a new workspace location. While not directly destructive or creating data, it reversibly changes application state and affects which datasets subsequent tools operate on. This could redirect operations to unintended data sources, making it a Write-category risk (state modification).

From the tool's definition Tool sets `arcpy.env.workspace` to a geodatabase or folder, which configures the base directory for subsequent operations like list_feature_classes. This is a configuration change that modifies the execution environment state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_workspace Rate-limited

set_workspace 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": {
    "set_workspace": {
      "limits": [
        {
          "counter": "set_workspace_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 Arcmap, so you can run agents against it safely.

FAQ

Questions about set_workspace

What does the set_workspace tool do? +

Fija arcpy.env.workspace (gdb o carpeta) — base para list_feature_classes /. It is categorised as a Write tool in the Arcmap MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_workspace? +

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

What risk level is set_workspace? +

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

Can I rate-limit set_workspace? +

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

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

set_workspace is provided by the Arcmap MCP server (pedralcg/arcmap-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.