geometry_buffer · ArcGIS MCP: Risk & Policy

WHAT IT DOES

What geometry_buffer does on ArcGIS MCP

AI agents invoke geometry_buffer to trigger actions in ArcGIS MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why geometry_buffer needs a policy

Buffering geometry typically involves running a geoprocessing computation on spatial data. Given the server description mentions geoprocessing tools, this likely executes a spatial operation. Without a description, confidence is low, but the name suggests an Execute-category geoprocessing task rather than a simple read or destructive action.

From the tool's definition Tool name 'geometry_buffer' suggests a geoprocessing operation that computes a buffer zone around geometries. Description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

geometry_buffer Rate-limited

geometry_buffer stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "geometry_buffer": {
      "limits": [
        {
          "counter": "geometry_buffer_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 geometry_buffer

What does the geometry_buffer tool do? +

geometry_buffer. It is categorised as a Execute tool in the ArcGIS MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on geometry_buffer? +

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

geometry_buffer is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit geometry_buffer? +

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

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

geometry_buffer 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.