memo_create · Ninetn MCP Server MCP: Risk & Policy

WHAT IT DOES

What memo_create does on Ninetn MCP Server

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

WHY IT NEEDS A POLICY

Why memo_create needs a policy

This tool creates new memos in the Ninetn application, which is a classic Write category operation (creates or modifies data reversibly). The severity is low because: (1) memos are typically low-risk business/personal notes with no financial or destructive impact, (2) the operation requires explicit user approval before persistence, (3) created memos can be deleted or edited later, and (4) there are no indications…

From the tool's definition Tool name 'memo_create' and description states 'Creates a new memo' - a creation operation that modifies data reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

memo_create Rate-limited

memo_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": {
    "memo_create": {
      "limits": [
        {
          "counter": "memo_create_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 Ninetn MCP Server, so you can run agents against it safely.

FAQ

Questions about memo_create

What does the memo_create tool do? +

Creates a new memo by AI assistant. Created memos require user approval and will be saved as regular memos after approval. Channel ID is optional, and the currently active channel is used when omitted. It is categorised as a Write tool in the Ninetn MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on memo_create? +

Register the Ninetn MCP Server MCP server in PolicyLayer and add a rule for memo_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 Ninetn MCP Server. Nothing to install.

What risk level is memo_create? +

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

Can I rate-limit memo_create? +

Yes. Add a rate_limit block to the memo_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 memo_create completely? +

Set action: deny in the PolicyLayer policy for memo_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 memo_create? +

memo_create is provided by the Ninetn MCP Server MCP server (diatonic-codes/ninetn-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.