store_note · MCP Demo Application MCP: Risk & Policy

WHAT IT DOES

What store_note does on MCP Demo Application

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

WHY IT NEEDS A POLICY

Why store_note needs a policy

This tool writes a note to the system, which is a reversible write operation. It does not delete, execute code, or involve financial transactions. The blast radius is low since notes are benign data with no system-level impact.

From the tool's definition 'Store a note in the system with optional tags for organization' — creates/saves new data reversibly

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

store_note Rate-limited

store_note 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": {
    "store_note": {
      "limits": [
        {
          "counter": "store_note_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 MCP Demo Application, so you can run agents against it safely.

FAQ

Questions about store_note

What does the store_note tool do? +

Store a note in the system with optional tags for organization. It is categorised as a Write tool in the MCP Demo Application MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on store_note? +

Register the MCP Demo Application MCP server in PolicyLayer and add a rule for store_note: 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 MCP Demo Application. Nothing to install.

What risk level is store_note? +

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

Can I rate-limit store_note? +

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

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

store_note is provided by the MCP Demo Application MCP server (mic-havock/model-context-protocol). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.