send · Slack Notifier MCP: Risk & Policy

WHAT IT DOES

What send does on Slack Notifier MCP

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

WHY IT NEEDS A POLICY

Why send needs a policy

This tool creates/posts messages to Slack, which is reversible data creation (messages can be edited or deleted). It does not execute arbitrary code, delete data irreversibly, or move money, so it is Write rather than Execute/Destructive/Financial.

From the tool's definition Tool named 'send' on a Slack Notifier MCP server described as enabling 'communication' and 'task notifications' to Slack. The server explicitly supports 'message threading' and 'interactive question-and-answer workflows,' indicating this tool sends messages.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send Rate-limited

send 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": {
    "send": {
      "limits": [
        {
          "counter": "send_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 Notifier MCP, so you can run agents against it safely.

FAQ

Questions about send

What does the send tool do? +

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

How do I enforce a policy on send? +

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

What risk level is send? +

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

Can I rate-limit send? +

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

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

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