create_zone · Elastic Brain ZH MCP: Risk & Policy

WHAT IT DOES

What create_zone does on Elastic Brain ZH

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

WHY IT NEEDS A POLICY

Why create_zone needs a policy

The tool creates a new memory zone in the Elasticsearch-based system, which is a reversible write operation. It adds new organizational structure to the persistent knowledge storage without deleting or executing external operations.

From the tool's definition Tool name is 'create_zone' and description states 'Create a new memory zone with optional description.' This directly indicates data creation/modification via a write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_zone Rate-limited

create_zone 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": {
    "create_zone": {
      "limits": [
        {
          "counter": "create_zone_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 Elastic Brain ZH, so you can run agents against it safely.

FAQ

Questions about create_zone

What does the create_zone tool do? +

Create a new memory zone with optional description. It is categorised as a Write tool in the Elastic Brain ZH MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_zone? +

Register the Elastic Brain ZH MCP server in PolicyLayer and add a rule for create_zone: 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 Elastic Brain ZH. Nothing to install.

What risk level is create_zone? +

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

Can I rate-limit create_zone? +

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

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

create_zone is provided by the Elastic Brain ZH MCP server (tocharianou/elastic-brain-zh). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.