create-item · Omeka S Mcp Sample MCP: Risk & Policy

WHAT IT DOES

What create-item does on Omeka S Mcp Sample

AI agents use create-item to create or update resources in Omeka S Mcp Sample — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Omeka S Mcp Sample environment.

WHY IT NEEDS A POLICY

Why create-item needs a policy

Creating items in Omeka S (a digital library/museum platform) adds new records to the system. This is a Write operation because it creates data that can be modified or deleted later, unlike Destructive operations. Severity is medium because uncontrolled item creation could clutter the database or create unwanted catalog entries, but the impact is limited to the digital collection and reversible.

From the tool's definition Tool name 'create-item' and description 'Create a new item in Omeka S' indicate data creation. This is a reversible modification operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create-item Rate-limited

create-item 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-item": {
      "limits": [
        {
          "counter": "create-item_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 Omeka S Mcp Sample, so you can run agents against it safely.

FAQ

Questions about create-item

What does the create-item tool do? +

Create a new item in Omeka S. It is categorised as a Write tool in the Omeka S Mcp Sample 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-item? +

Register the Omeka S Mcp Sample MCP server in PolicyLayer and add a rule for create-item: 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 Omeka S Mcp Sample. Nothing to install.

What risk level is create-item? +

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

Can I rate-limit create-item? +

Yes. Add a rate_limit block to the create-item 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-item completely? +

Set action: deny in the PolicyLayer policy for create-item. 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-item? +

create-item is provided by the Omeka S Mcp Sample MCP server (nakamura196/omeka-s-mcp-sample). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.