op_create_item · Op MCP: Risk & Policy

WHAT IT DOES

What op_create_item does on Op

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

WHY IT NEEDS A POLICY

Why op_create_item needs a policy

op_create_item creates new password vault entries. This is a Write operation (reversible via deletion or editing) rather than Read (no retrieval), Execute (no command execution), or Destructive (creation is reversible). However, severity is high because misuse could add malicious credentials, backdoor accounts, or spam the vault with fake secrets that could be retrieved and used by an attacker.

From the tool's definition Server description states it 'enables MCP clients like Claude and Cursor to read, create, edit, and delete password vault items.' The tool name 'op_create_item' matches the 'create' operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

op_create_item Rate-limited

op_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": {
    "op_create_item": {
      "limits": [
        {
          "counter": "op_create_item_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Op, so you can run agents against it safely.

FAQ

Questions about op_create_item

What does the op_create_item tool do? +

op_create_item. It is categorised as a Write tool in the Op MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on op_create_item? +

Register the Op MCP server in PolicyLayer and add a rule for op_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 Op. Nothing to install.

What risk level is op_create_item? +

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

Can I rate-limit op_create_item? +

Yes. Add a rate_limit block to the op_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 op_create_item completely? +

Set action: deny in the PolicyLayer policy for op_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 op_create_item? +

op_create_item is provided by the Op MCP server (jluckyiv/op-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.