create_reminder · Reminders MCP: Risk & Policy

WHAT IT DOES

What create_reminder does on Reminders

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

WHY IT NEEDS A POLICY

Why create_reminder needs a policy

This tool creates a new reminder, which is a reversible write operation. It does not execute code, delete data irreversibly, or involve financial transactions. The blast radius is low since reminders are non-critical user data that can be easily modified or removed. Confidence is high based on the clear and explicit description.

From the tool's definition Tool name 'create_reminder' and description 'Create a new reminder in a specific list' indicate creation of new data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_reminder Rate-limited

create_reminder 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_reminder": {
      "limits": [
        {
          "counter": "create_reminder_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 Reminders, so you can run agents against it safely.

FAQ

Questions about create_reminder

What does the create_reminder tool do? +

Create a new reminder in a specific list. It is categorised as a Write tool in the Reminders 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_reminder? +

Register the Reminders MCP server in PolicyLayer and add a rule for create_reminder: 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 Reminders. Nothing to install.

What risk level is create_reminder? +

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

Can I rate-limit create_reminder? +

Yes. Add a rate_limit block to the create_reminder 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_reminder completely? +

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

create_reminder is provided by the Reminders MCP server (walalabs/reminders-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.