webhook_create · ArcGIS MCP: Risk & Policy

WHAT IT DOES

What webhook_create does on ArcGIS MCP

AI agents use webhook_create 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 webhook_create needs a policy

Creating a webhook establishes an integration that sends data to an external URL on events, which is a Write operation (reversible, can be deleted). However, it could enable data exfiltration or trigger external systems. Without a description, confidence is reduced. Severity is high because a malicious webhook could forward sensitive GIS data to an attacker-controlled endpoint.

From the tool's definition Tool name 'webhook_create' suggests creating a webhook; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

webhook_create Rate-limited

webhook_create 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": {
    "webhook_create": {
      "limits": [
        {
          "counter": "webhook_create_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 webhook_create

What does the webhook_create tool do? +

webhook_create. 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 webhook_create? +

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

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

Can I rate-limit webhook_create? +

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

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

webhook_create 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.

// THE FULL RECORD

webhook_create is one line of ArcGIS's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

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