reminders_add · Slack MCP: Risk & Policy

WHAT IT DOES

What reminders_add does on Slack

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

WHY IT NEEDS A POLICY

Why reminders_add needs a policy

This tool creates or adds a new reminder in Slack, which is a reversible write operation. While the description is empty and provides no details, the name 'reminders_add' combined with the server's stated functionality of providing full Slack access indicates it creates reminder data.

From the tool's definition Tool named 'reminders_add' on a Slack MCP server with 220 tools providing 'full access to Slack: messages, channels, files, canvases, lists, search, reactions, and more'. The 'add' suffix indicates creation of a new reminder object.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

reminders_add Rate-limited

reminders_add 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": {
    "reminders_add": {
      "limits": [
        {
          "counter": "reminders_add_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 Slack, so you can run agents against it safely.

FAQ

Questions about reminders_add

What does the reminders_add tool do? +

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

How do I enforce a policy on reminders_add? +

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

What risk level is reminders_add? +

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

Can I rate-limit reminders_add? +

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

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

reminders_add is provided by the Slack MCP server (karbassi/slack-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.